What is the full name of ether?

Ether

[Chinese name] ether; dimethyl ether; oxo-bis-methane

English name dimethyl ether; methoxymethane

CAS No. 115-10-6

Molecular formula]

CH3-O-CH3

All C, O atoms form σ-bonds with sp3 hybridized orbitals.

[Relative molecular weight] 46.07

[MF] [Density] C2H6O

1.617 Relative density (air= 1)

Melting point (°C) -138.5

Boiling point (°C) -24.5

Flash point (°C) -41.4

Vapor pressure (Pa) 663 (-101.53 ℃); 8119 (-70.7 ℃); 21905 (-55 ℃)

Properties colorless flammable gas or compressed liquid, with the odor of ether.

Solubility: soluble in water and ethanol.

Use as solvent, refrigerant.

{

Preparation or dehydration from methanol, also obtained by catalytic decomposition of ferric chloride in formic acid proto.

[other]Critical temperature 128.8 °C. Critical pressure 5.32 MPa. Freezing point -138.5 ℃. Liquid density of the third part 0.661

:Hazardous -

Hazardous level:

Route:

Health hazards: inhibitory effect on the central nervous system, weak anesthetic effect. Inhalation can cause anesthesia, choking sensation. Skin irritation.

Environmental Hazards:

Flammability and Explosion Hazard: this product is flammable and irritating. PART IV

First Aid Measures -

Skin Contact:

Eye Contact:

Inhalation:

Remove quickly from the scene to fresh air. Keep airway open. If breathing is difficult, give oxygen. If breathing stops, give artificial respiration immediately. Doctor.

Inhalation:

PART V: FIRE PROTECTION MEASURES -

Hazardous Characteristics: Flammable gas. Can form explosive mixtures when mixed with air. Burns in explosive contact with heat sources, sparks, flames or oxidizers. Contact with air or peroxide can produce a potential explosion hazard under light conditions. The gas is heavier than air, can diffuse to the lower part of a considerable distance, when the ignition source will catch fire back to combustion. If high heat, the container pressure increases, there is a risk of cracking and explosion.

Harmful combustion products: carbon monoxide, carbon dioxide.

Fire extinguishing method: cut off the gas source. If you cannot cut off the gas source, do not allow to extinguish the leaking flame. Spray water to cool the container and move from the fire to an open area if possible. Container. Extinguishing agents: fog water, insoluble foam, dry powder, carbon dioxide, sand.

Part VI: Spill Response -

Emergency Response: Employee spills contaminated area personnel to the windward side, and isolation, strict restrictions on access to the rapid evacuation. Cut off the source of ignition. It is recommended that emergency personnel wear self-contained positive pressure respirator, wear anti-static work clothes. Cut off possible sources of leakage. Industrial coverings or adsorbents/absorbents cover areas such as sewers near the leak to prevent gas entry. Reasonable ventilation to accelerate diffusion. Spray water diluent. Construct a berm or dig a pit to shelter the large amount of waste generated. Leaking containers should be properly handled, repaired, and inspected before reuse.

Part VII: Operation Disposal and Storage -

Operation precautions: airtight operation, full ventilation. Operators must be specially trained and strictly follow the operating procedures. Operators are recommended to wear self-priming filtering gas mask (half mask), chemical safety glasses, anti-static work clothes and chemical resistant gloves. Keep away from fire, heat source, and smoking is strictly prohibited in the workplace. Use explosion-proof ventilation systems and equipment. Prevent gas leakage into the workplace air. Avoid contact with oxidizers, acids, halogens. Cylinders and containers must be grounded and straddled to prevent static electricity during transfer. Handle with care and prevent damage to cylinders and accessories. The variety and quantity of corresponding fire-fighting equipment and leakage emergency response equipment.

Storage: Store in a cool, ventilated warehouse. Keep away from fire and heat source. The storage temperature should not exceed 30℃. Should be stored separately with oxidizers, acids, halogens, do not mix storage. Explosion-proof lighting, ventilation facilities. Prohibit the use of mechanical equipment and tools that are easy to produce sparks. The storage area should be equipped with leakage emergency treatment equipment.

Section 8: Exposure Controls/Personal Protection -

Chinese MAC for Occupational Exposure Limits (MG/M3): not developed

Former Soviet MAC (MG/M3): not developed BR /> TLVTN: not developed

TLVWN: not developed

Monitoring Methods:

Engineering Controls : Manufacturing processes are airtight and fully ventilated.

Respiratory protection: Self-priming filtering gas mask (half mask) is recommended when airborne concentrations are exceeded.

Eye protection: Wear chemical safety glasses.

Body protection: Wear anti-static work clothes.

Hand protection: wear gloves against chemicals.

Other protection: Smoking is strictly prohibited at the work site. Entering the water tank, or high concentration area operation and other restricted space, must be supervised.

Part IX: Physical and Chemical Properties -

Main Component: Pure

Appearance: colorless gas with special odor of ether.

pH value:

Melting point (℃): -141.5

Boiling point (℃): -23.7

Relative density (water= 1): 0.66

Relative vapor density (air= 1): 1.62

Saturated vapor pressure (kPa): 533.2 (20℃)

Burning (kJ/mol) heat of combustion: 1453

Critical temperature (°C): 127

Critical pressure (MPa): 5.33

Logarithmic value of the octanol/water partition coefficient: not available

Flash point (°C): not significant

Initiation temperature (°C): 350

Lower explosion limit % (V / V): 27.0

Lower Explosion Limit % (V / V): 3.4

Solubility: Soluble in water, ethanol, ether.

Main application: used as refrigerant, solvent, extractant, catalyst and polymer stabilizer.

Other Properties:

Part X: Stability and Reactivity -

Stability:

Incompatibility: strong oxidizing agents, acids, halogens.

Conditions for avoiding exposure:

Polymerization hazards:

Decomposition products:

Part XI

: Toxicological profile -

Acute toxicity:

LD50: Not available

LC50: 308,000 MG/M3 (inhalation in rats)

Subacute and chronic toxicity:

Irritation:

Sensitization:

Mutagenicity:

Teratogenicity:

Carcinogenicity:

Section 12: Ecological Information -

Ecotoxicity:

Biodegradation:

Nonbiodegradation:

Bio-enrichment or bio-accumulation. >Other harmful effects: no information available.

Part XIII: Waste Disposal -

Nature of Waste:

Method of Waste Disposal:

National and local regulations should be consulted before disposal. Disposal by Incineration Recommendation.

Discard Precautions:

Part 14: Transportation Information -

Dangerous Goods No.: 21040

UN No.: 1033

Packaging Identification:

Packaging Category: O52 BR /> Packaging: steel bottles; Frosted glass bottles or threaded-mouth glass bottles outside of a plain wooden crate; ampoules outside of a Ordinary wooden case.

Transportation Note: Cylinders must be transported wearing a helmet on the bottle just. Cylinders roughly flat, and in the bottle should be in the same direction, can not be crossed; fence height shall not exceed the board of the vehicle, and with triangular wooden pads stuck firmly to prevent rolling. Transportation vehicles should be equipped with the number of corresponding varieties and firefighting equipment during transportation. Vehicle exhaust bill of lading of this product must be equipped with fire stopping devices, prohibit the use of easy to produce mechanical equipment and tools for loading and unloading sparks. Non-oxidizing agents, acids, halogens, edible chemicals and other mixed loads and mixed transport. Summer should be transported in the morning and evening, to prevent sun exposure. Keep away from fire and heat source during stopover. According to the road traffic main road, prohibited in residential areas and densely populated areas of the regulations. Railroad transportation should be prohibited from slipping.

Part 15: Regulatory Information -

Regulatory Information Regulations on the Safe Management of Chemical Hazardous Substances (issued by the State Council on February 17, 1987), the implementation of the Regulations on the Safety of Dangerous Chemicals (Labor [1992] No. 677), the regulations for the safe use of chemicals in the workplace ([1996] Ministry of Labor issued No. 423), and other relevant provisions of the safety of hazardous materials used. Chemical production, storage, transportation, loading and unloading, etc. have made corresponding provisions; product classification and labeling of common hazardous chemicals (GB 13690-92) will be classified as Class 2.1 flammable gases.

Part XVI: Other information -

References:

Guidance Department:

Data Review Unit:

Description:

Other information:

[DME Supplementary Known Ether, referred to as DME, at atmospheric pressure or pressurized gas is a colorless liquid with a slight odor ether in. Relative density (20 ℃) 0.666, melting point -141.5 ℃, boiling point -24.9 ℃, at room temperature when the vapor pressure of about 0.5MPa, and liquefied petroleum gas (LPG) is similar. Soluble in water and various organic solvents such as alcohol, ether, acetone, chloroform. Flammable, slightly bright flame in the combustion (natural gas) heat of combustion is 1455kJ/mol. DME inert, easily auto-oxidized at room temperature, non-corrosive, non-carcinogenic, but radiation or heating decomposition into methane conditions, ethane, formaldehyde. DME is ether

Homologue, but can not be used as an anesthetic ether, low toxicity; a variety of chemicals can be dissolved; easy due to its compression, condensation, evaporation, and many polar or non-polar solvents in the solubility, is widely used in aerosol products, replacement of Freon refrigerants, solvents, etc., but also can be used in chemical synthesis, the use of the more widely.

Dimethyl ether as a new type of basic chemical raw materials, due to its good ease of compression, condensation, vaporization, which makes the dimethyl ether in the pharmaceutical, fuel, pesticides and other chemical industries in many unique uses. For example, high purity DME can be used to replace CFC aerosol propellants and refrigerants to reduce pollution and destruction of the ozone layer. Its good solubility in water and resistance to oils makes it much more versatile than propane, butane and other petrochemicals. Using methanol as a feedstock, rather than a new production of formaldehyde, formaldehyde can significantly reduce production costs, showing its superiority in large formaldehyde plants. As a civilian fuel gas storage and transportation, combustion safety, premixed gas calorific value and theoretical combustion temperature and other performance indicators are better than liquefied petroleum gas, city gas pipeline peaking gas, liquefied petroleum gas mixing well. Also ideal fuel for diesel engines, compared with methanol-fueled cars, there is no automobile cold start problem. It is also the main raw material for olefins in the future preparation of 1.

DME can also replace diesel as a fuel, the current need to solve the problem is mainly dimethyl ether and diesel engine oil used for corrosion of plastic materials modification.

Currently dimethyl ether (DME) is used as a propellant, refrigerant and blowing agent for the main purpose. The second is used as a chemical raw material to produce a variety of organic compounds. Such as dimethyl sulfate, alkyl halide, N, N-dimethyl aniline, methyl acetate, acetic anhydride, dimethyl carbonate, dimethyl sulfide, dimethyl ether, glycol ether series.

Dimethyl ether is easy to compress, easy to store, high combustion efficiency, low pollution, and can be used as a substitute for gas, liquefied petroleum gas for civilian fuel. On the other hand, DME has a high cetane number and can be directly used as fuel to replace diesel vehicles. Dimethyl ether as a clean fuel development prospects have great potential, has been widely concerned at home and abroad.

1 domestic and foreign market analysis

1.1 Market Analysis

The world production of dimethyl ether is mainly concentrated in the United States, Germany, the Netherlands and Japan, etc. In 2002, the global (excluding China, for the total production capacity of 208,000 tons / year, the same below), the production of 150,000 tons, 72% of the capacity utilization rate. DME main foreign producers are the U.S. Dopnt AKZO Netherlands, Germany DEA, United Rheinland Lignite Fuel Company, of which Germany DEA's largest production capacity, 65,000 tons / year production capacity.

The world's major DME producers manufacturers name

Serial capacity (10,000 tons/year)

1 Dopnt (U.S.) 3.0

2 DEA (Germany) 6.5

3 United Rheinland Lignite Fuels (Germany) 3.0

4 AKZO (Netherlands) 3.0

5 Sumitomo Corporation (Japan) 1.0

6 DEA (Australia) 1.0

7 Mitsui Toho Pressure (Japan) 0.5

> 8 Kang Sang (Japan) 1.8

9 NKK (Japan) 1.0

TOTAL 20.8 Since dimethyl ether is a market demand with huge potential in the global dimethyl construction has become a popular ether and some big DME plants are already in preparation.

The DME Development Corporation (a Japanese consortium of the company Daudalfina Elf and eight companies) plans to build a 2,500-ton-per-day commercial DME plant capacity. Toyo Engineering Corporation completed construction of a single-family, 2.5 million ton/year DME plant in the Middle East to validate expectations and expects the plant to be completed in 2005-2006. BP, India, and Indian Oil Corporation Gas Authority will invest 6,000 million dollars in the construction of a 1.8 million ton DME commercial production plant to replace naphtha, diesel, and LPG, with construction work beginning in 2002 and to be commissioned in 2004. A large-scale DME plant consisting of 1.4-2.4 million tons/year is being constructed in Australia by a joint venture Japanese consortium (Mitsubishi Gas Chemical Corporation, Nippon Volleyball, Mitsubishi Heavy Industries & Itochu Corporation) and is scheduled to be in production in 2006.

The main consumption areas of dimethyl ether used as solvents and aerosol propellants, and much consumption in other areas. DME global consumption in 2002 was 150,000 tons / year, 2005 demand is expected to be about 200,000 tons / year.

Dimethyl ether is a good performance, safe and clean chemical products, the development prospects are generally favorable. What's more, as a new, clean and civilian vehicle fuel, it is seen as a good alternative to diesel or LPG/natural gas, which will be very alarming growth in demand for the fuel.

In 2000 there were 4 million LPG vehicles worldwide, 4,000,000 ethanol, millions of CNG vehicles, and a fraction of methanol vehicles. In the U.S., 2000 U.S. use of alternative fuel vehicles as projected by 2005 420,000 U.S. use of alternative fuel (LPG and CNG) vehicles will reach 1.1 million to 3.3 million in 2010 and 5.5 million in 2015. Alternative fuel consumption is about 1 million tons then (352 x 106 gallons of gasoline equivalent), then about 0.2% of all fuel consumption. If the share of alternative fuels in the United States is increased to 5%, then it will have a demand of 250,000 tons, and the market outlook visible for alternative fuels is quite impressive.

Asia is the world's fastest growing diesel consumption in the region, according to foreign research institutions predicted that dimethyl ether as an alternative fuel in the Asian region in 2005 demand for alternative fuels reached 300,000 tons. It can be seen, because other alternative fuels dimethyl ether has incomparable advantages, will become the main alternative to diesel fuel, has an immeasurable market prospects.

1.2 Analysis of the domestic market

In recent years, the production of dimethyl ether in China's rapid development, there are now more than a dozen manufacturers in 2002, 31,800 tons / year of total production capacity, the output of about 20,000 million tons or so, the capacity utilization rate is low, about 63%.

Dimethyl ether and the ability of the main manufacturers (unit: 10,000 tons / year)

Manufacturers name serial production capacity

1 Jiangsu Wu County Chemical Synthesis 2000

2 Zhongshan City, Kaida Fine Chemical Co. 5,000

3 Chengdu Huayang Weiyuan natural gas plant 2000

Petrochemical 4 Shanghai Research Institute 800

5 1000

6 Kunshan, Jiangsu, Shaanxi New Fuel Burning Appliance Company 5000 7 Mengcheng County, Anhui Province, 2500

8 Fertilizer in Zhuji Xinya Chemical Company, Zhejiang Province 1000

9 Nitrogenous Fertilizer Plant Factory in Jiangmen, Guangdong Province, 2500

10 Nitrogenous Fertilizer Plant Factory of Yiwu Guangyang Chemical Co. p>

11 Shanghai Shenwei Aerosol Company 1000

12

Shandong Jutai Chemical Science and Technology Limited Liability Company 5000

13 Hubei Tian Industry Co. Ltd. 1500

Recently the total of 31800

Dimethyl ether domestic construction boom has been formed, the company plans to launch several technologies through joint ventures and so on Construction of large-scale dimethyl ether production units.

The main projects or plans under construction are as follows:

In April 2001, New Fuel Furniture Co., Ltd. signed a joint development and the United States Mega Resources Ltd. "coal-based one-step synthesis of 200,000 tons / year of DME ultra-clean fuels," the project agreement, the project's total investment of 203 million yuan, 90% of the U.S. investment. 90% of the U.S. investment.

Ningxia coal-based dimethyl ether project 830,000 tons / year, the planned investment of 478 billion yuan, the proposed use of foreign capital, has been with the Canadian company Jimmy Knight, relying on the U.S. Air Force technology joint venture cooperation agreement.

Sichuan Luzhou Natural Gas Company using a two-step process has been completed, 10,000 tons / year dimethyl ether device, the second 100,000 tons / year dimethyl ether device, has begun construction.

Chemical Co., Ltd. Shandong Linyi Luming is building 30,000 tons / year dimethyl ether plant, the use of self-developed gas-liquid two-step process technology.

Year / & gt; Shandong Huaxing Group annual production, equipment using a two-step process.

Shandong Yankuang Group plans to build 600,000 tons of dimethyl ether device, plans to launch a one-step process dimethyl ether technology.

Additionally, the proposed national construction has many local dimethyl ether devices, such as: Southwest Petroleum and Natural Gas Administration, Xinjiang, Heilongjiang Shuangyashan, Daqing Oilfield, Shaanxi Province, Lanzhou City, Anhui Province.

The main use of DME in China is as aerosols, aerosols and spray coatings propellants consume 18,000 tons of DME per year. Due to the rapid development of the aerosol industry, it is expected that about 30,000 tons of DME will be needed by 2005, and by 2010 it will be about 40,000 tons. In the synthesis of fine chemicals such as dimethyl ether dimethyl sulfate is also used, consuming about 11,000 tons.

Because the nature of DME and LPG is similar, easy to save, easy to compress, it can replace natural gas, gas, LPG for civilian fuel. In 2002, China's apparent consumption of LPG was 162,000 tons, while China's imports of LPG in 1990 were many since 2002, with imports of 6.26 million tons of LPG. DME, if the price is right, assuming that DME replaces imported LPG, in the current import volume calculations, the need for fuel grade DME about 10 million tons. With the continuous improvement of people's living standards, the domestic demand for fuel will have a greater growth, especially for natural gas, DME, LPG and other clean energy demand will grow significantly, therefore, DME as a fuel for civilian development prospects are very broad.

Because DME has excellent fuel performance, convenient, clean, high cetane number, power performance, less pollution, a little pressure is fluid, easy to store, alternative fuel cars for diesel, liquefied petroleum gas, natural gas, methanol, ethanol and so on. Unrivaled comprehensive advantages.

Annual consumption of diesel fuel in 2002 was 76.62 million tons, an increase of diesel fuel consumption year-on-year very quickly, consumption is expected to reach 82.9 million tons in 2005, 2010 will reach about 101 million tons. DME as a good alternative fuel to diesel alternative diesel in their annual rate of 5%, around 2005 to about 5.53 million tons of DME, throughout about 6.74 million tons in 2010.

In summary, our DME is expected to reach about 5-6 million tons of demand in 2005 along with the aerosol and chemical side of demand. The consumption of DME as an alternative fuel depends mainly on the supply side of DME, if the price falls DME can compete with the level of diesel or LPG, I believe that the consumption of DME as a fuel grows very fast and the size of the market is quite impressive.

2 Technical Analysis

Dimethyl ether is produced by one-step and two-step. DME is synthesized by a one-step process, a two-step synthesis is defined from the methanol in the synthesis gas, and then DME is dehydrated in the raw gas.

● The latter step

Law is converted or gasified to produce syngas from natural gas, the syngas enters the synthesis reactor, the reactor reacts and converts the methanol synthesis and methanol dehydration while completing the two-step reaction product is a mixture of methanol and dimethyl ether and passes the mixture through the distillation separator, the dimethyl ether, and the un-reacted methanol is returned to the synthesis reactor. Multi-step

Bifunctional catalysts, whose catalysts are generally physically mixed in two categories, one class for methanol synthesis catalysts such as Cu-Zn-Al system (O)-based catalysts, BASFS3-85 and ICI-512, and so on; those for the dehydration of methanol catalysts, such as alumina, porous silica - alumina, Y-type zeolites, ZSM-5 zeolites, mercerized zeolites, and so on.

The two-step method was carried out in two steps, i.e., firstly synthesize the DME of solid catalyst in methanol dehydration through the synthesis gas of methanol. γ-Al2O3/SiO2, which is more used domestically, was fabricated with ZSM-5 molecular sieve as the catalyst for dehydration. The reaction temperature is controlled at 280340 ℃, pressure 0.5- for 0.8MPa. The one-way conversion of methanol is 70-85%, and the selectivity of DME is more than 98%.

No intermediate one-step synthesis of dimethyl ether methanol synthesis process with a two-step method compared to the process is simple, less equipment, low investment, low operating costs, which makes the production of dimethyl ether cost reduction, economic improvement. Therefore, one-step synthesis of dimethyl ether is the development of domestic and international hot issues. Representative steps developed abroad: Denmark Topsφe process, the United States Airborne Chemical Products Japan NKK process and technology.

The two-step synthesis of dimethyl ether is the main dimethyl ether production technology at home and abroad, the law of the ground refined methanol as raw material, through the amount of less, dehydration reaction by-products, 99.9%, the purity of dimethyl ether, the technology is mature, wide device adapted to deal with the simple, can be built directly in the production of methanol plant, but also built-in other utilities good non-methanol production plant. However, the law has to go through the methanol synthesis, methanol distillation, methanol and dimethyl ether distillation and other processes of dehydration, the process is longer, so there is a larger investment in equipment. However, at present, the vast majority of foreign announced DME technology of the use of two-step large-scale construction projects, indicating that the two-step method has a strong integrated competitiveness.

2.1 The main foreign technology

(1) Topsφe process

Topsφe syngas one-step process is a new technology developed specifically for natural gas feedstock. The gas generation part of the selected process is autothermal reforming (ATR). The refractory lining from the autothermal reformer consists of a high-pressure reactor, and a 3-part catalyst bed chamber.

The built-in adiabatic reactor uses a multi-stage cooling stage to obtain high conversion between CO and CO2 for the synthesis of DME. A hybrid bifunctional catalyst for methanol synthesis and dehydration to generate DME.

Using a spherical shape, a single capacity DME synthesis reactor can reach 7200 tons/day of DME. 4.2MPa and 240290°C Topsφe process operating conditions were selected.

A commercial plant has not yet been built for this process. In 1995, Topsφe established a 50 kg/day pilot plant in Copenhagen, Denmark, as well as for testing the performance of the method.

(2) Air Products in the liquid phase dimethyl ether (LPDMETM) new technology, Air Products successfully developed liquid dimethyl ether new technology, referred to as LPDMETM.

Process LPDMETM main advantage is the use of slurry bubbling bed reactor abandoned the traditional fixed bed reactor gas phase. The catalyst particles are finely powdered and slurries are formed with an inert mineral oil. Crude syngas is injected at high pressure from the bottom, bubbling the solid catalyst particles with the gas feed to achieve full mixing. Mixing with mineral oil makes for a more complete, isothermal operation with easy temperature control.

The DME Synthesis Reactor has built-in cooling tubes for heat while producing steam. The slurry reactor catalyst is easily loaded and unloaded without downtime. In addition, due to the isothermal operation of the reactor, there are no hot spots and the catalyst deactivation rate is significantly reduced.

Typical reactor operating parameters: pressure 2.7610.34 MPa, 5.17 MPa recommended; temperature 200350°C, 250°C recommended. Between 5% and 60% of the catalyzed amount of mineral oil by mass, preferably between 5% and 25%. The method of using CO-rich syngas has advantages over natural gas coal-based syngas. However, higher yields can also be obtained using natural gas as a feedstock. Air Products has a 15-ton-per-day pilot plant, and the testing process is yielding satisfactory results, but not the construction of a large-scale commercial plant.

(3) NKK Japan's new liquid step process

In addition to Air Products, NKK Japan has developed a new technology for one-step synthesis of DME in a slurry reactor with syngas.

The raw materials are selected from natural gas, coal, and LPG. The first step in the process is first gasification, the syngas is cooled and compressed to 57MPA, before entering a carbon dioxide absorber to remove CO 2. The crude syngas passes through a decarburized hot activated carbon adsorption tower into the bottom of the reactor at 200°C to remove sulfur compounds afterwards. The catalyst slurry in the syngas is bubbled with mineral oil in the reactor with the inclusion of dimethyl ether, methanol and carbon dioxide. The product is cooled in the reactor, fractionated, and separated into DME, methanol, and water. The unreacted syngas is recirculated back into the reactor. After fractionation, a high degree of purity can be obtained from the top of the DME (95% 99%) and the crude product can be obtained from the bottom of the methanol, DME and water. NKK technology has been used to synthesize 10,000 tons / DME within a year from syngas production of semi-industrial plant was built in Niigata.

2.2 Cases of domestic technology and scientific research across the country

The development of production technology and catalysts for methanol vapor method (two-step process) of DME in the 90s, and soon established industrial production facilities. In recent years, with the rise of the DME construction boom, China's two-step DME technology has been further developed, and the technology has approached or reached the international advanced level.

Shandong Jutai Chemical Technology Co., Ltd (formerly Linyi Luming Chemical Co., Ltd.) has successfully developed a proprietary catalytic dehydration of liquid-phase dimethyl ether composite acid production process, has built 5,000 tons / year of production units, after a year of practice has proved that the technology is mature and reliable. The company's second 30,000 tons / year device will also be put into production.

Shandong Jutai dimethyl ether technology has passed the Science and Technology Department of Shandong Province, was recognized as reaching the international level. Developed a particularly complex liquid-phase dehydration of acid and condensation catalyst separation technology, targeted to overcome the high cost of one-step synthesis and gas dehydration, the main drawbacks of the investment when the reaction can be carried out continuously, and dehydration, reducing the corrosion of the equipment and investment in purification equipment, 99.5% of the total recovery and not less than 99.9% purity, production costs greater than the gas-phase reduction.

In August 2003, a two-step DME production plant was developed in cooperation with Toyo Engineering Corporation of Japan's LTH for a successful test. The equipment is a reasonable process, optimize operating conditions, with high purity, low material consumption, low energy consumption, in terms of technology, product quality and automation hardware and other equipment at the domestic advanced level.

In recent years, China has also made great progress in the development of DME syngas synthesis technology is also very positive aspects, as well as a number of research institutions and universities. Portland Pathfinder Maryland Compound Fertilizer Plant

Institute, *** with a small trial study of 5mL of DME syngas law, focusing on process research, catalyst preparation and catalytic activity, service life visit. The test achieved good results: CO conversion > 85%; selectivity > 99%. Two long-cycle (500H, 1000H) tests showed that: the catalyst development has good stability in industrial raw syngas; organic matter > 97% DME selectivity; > 75% CO conversion; purity of DME products > 99.5%; total DME yield of 98.45%. Direct DME synthesis gas composite catalyst system

Dalian, Chinese Academy of Sciences conducted a systematic study to screen SD219-Ⅰ, SD219-Ⅱ and SD219-Ⅲ catalysts with better catalytic performance, CO conversion reached 90%, DME selectivity in the oxidation of organic materials is close to 100%.

Tsinghua University also carried out a slurry bed reactor one-step DME research, the use of LP and Al2O3 bifunctional catalysts, at 260-290 ℃, 4-6 MPa, one-way 55% to 65% CO conversion, the selectivity of DME is 90-94%.