What is the full name of ether?

Ether [Chinese name] ether; dimethyl ether; oxo-bimethane 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 (℃) -138.5 Boiling Point (℃) -24.5 Flash Point (℃) -41.4 Vapor Pressure (Pa) 663 (-101.53 ℃); 8119 (-70.7 ℃); 21905 (-55 ℃) Characteristics Colorless flammable gas or compressed liquid, with an odor of ether. Has the odor of ether. Solubility: soluble in water and ethanol. Uses Used as a solvent, refrigerant. { Prepared or dehydrated 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 °C. Liquid Density Part III 0.661 : Hazard - Hazard Class : Route : Health Hazard : Inhibitory effect on the central nervous system, weak anesthetic effect. Inhalation can cause anesthesia, choking sensation. Irritates skin. ENVIRONMENTAL HAZARD: FLAMMABILITY HAZARD: This product is flammable and irritating. FIRST AID MEASURES - SKIN CONTACT: EYE CONTACT: INHALATION: Remove from scene to fresh air. Keep airway open. If breathing is difficult, give oxygen. If breathing stops, administer artificial respiration immediately. Doctor. INGESTION: PART V: FIRE FIGHTING MEASURES - Hazardous Characteristics: Flammable gas. Can form explosive mixtures when mixed with air. Burns explosively in 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 the leaking flame to be extinguished. 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 EMERGENCY - EMERGENCY TREATMENT: Employee Spill Contaminated Area Personnel to upwind area and isolate, strictly limit access for rapid evacuation. Cut off the source of ignition. It is recommended that emergency personnel wear self-contained positive-pressure respirators and 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. Dispose of leaking containers properly, repair, and inspect before reuse. Part VII: Operation Disposal and Storage - Operational Precautions: airtight operation, full ventilation. Operators must be specially trained and strictly follow the operating procedures. It is recommended that operators wear self-absorbing filtering gas masks (half masks), 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. Variety and quantity of appropriate fire fighting equipment and spill 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 from 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 emergency response equipment for leakage. Section 8: Exposure Controls/Personal Protection - Chinese MAC for Occupational Exposure Limits (MG/M3): not developed Former Soviet Union MAC (MG/M3): not developed BR /> TLVTN: not developed TLVWN: not developed Monitoring Methods: Engineering Controls: Production process airtight, full ventilation. RESPIRATORY PROTECTION: Self-priming filtering gas masks (half masks) are recommended when airborne concentrations are exceeded. Eye protection: Wear chemical safety glasses. Body protection: Wear anti-static work clothes. Hand protection: Wear gloves to protect 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 components: Pure Appearance: colorless gas, with the special smell 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 ℃) Heat of combustion (kJ/mol): 1453 Critical temperature (℃): 127 Critical pressure (MPa): 5.33 Octanol / water partition coefficient of the Logarithmic value: no information Flash point (℃): no significance Ignition temperature (℃): 350 Lower limit of explosion % (V / V): 27.0 Lower limit of explosion % (V / V): 3.4 Solubility: soluble in water, ethanol, ether. Main Uses: Used as refrigerant, solvent, extractant, catalyst and polymer stabilizer. OTHER PROPERTIES: PART X: STABILITY AND REACTIVITY - STABILITY: INCOMPATIBILITY: Strong oxidizers, acids, halogens. Conditions for Avoiding Exposure: Polymerization Hazards: Decomposition Products: SECTION 11 : TOXICOLOGICAL PROFILE - ACUTE TOXICITY: LD50: Not available LC50: 308,000 MG/M3 (rat inhalation) SUBACCURRENT AND CHRONIC TOXICITY: Irritation: Sensitizing Effects: Mutagenicity: Teratogenicity: Carcinogenicity: SECTION 12 : ECOLOGICAL PROFILE - ECOLOGICAL TOXICITY: Biodegradable: Non-Biodegradable: Bio-enrichment or Bioaccumulation: Other harmful effects: No information available. SECTION 13: WASTE DISPOSAL - NATURE OF WASTE: WASTE DISPOSAL METHODS: National and local regulations should be consulted before disposal. Disposal by incineration is recommended. Waste Precautions: Part 14: Transportation Information - Dangerous Goods No.: 21040 UN No.: 1033 Packaging Identification: Packing Group: O52 BR /> Packaging: steel cylinders; frosted glass bottles or threaded-mouth glass bottles outside the ordinary wooden crates; ampoules outside the ordinary wooden crates. Transportation precautions: cylinders must wear a helmet on the bottle just transport. Cylinders roughly flat, and in the bottle should be in the same direction, can not be crossed; fence height shall not exceed the vehicle's board, 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 skidding. 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 implementing rules for the safety of hazardous chemicals (Labor [1992] No. 677), the safe use of chemicals in the workplace regulations ([1996] Ministry of Labor issued No. 423) and other relevant provisions of the safe use of hazardous chemicals production, storage, transportation, loading and unloading, and so on. Aspects of the production, storage, transportation, loading and unloading of hazardous chemicals have been made corresponding provisions; product classification and labeling of common hazardous chemicals (GB 13690-92) will be classified as a class 2.1 flammable gases. Part XVI: Other Information - Reference: Guidance Department: Data Review Unit: Description: Other Information:] [DME supplement 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 ℃, and liquefied petroleum gas (LPG) is similar to the vapor pressure of about 0.5 MPa at room temperature. 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 under the conditions of 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 a wider range. 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 olefins in the future of the main raw material preparation of 1. DME can also replace diesel fuel, the current need to solve the problem is mainly dimethyl ether and diesel engine oil used for corrosion of plastic material modification. Currently dimethyl ether (DME) is used as a propellant, refrigerant and foaming 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 and so on. DME is easy to compress, easy to store, high combustion efficiency, low pollution, and can be used as a substitute for coal gas and liquefied petroleum gas for civilian fuel. On the other hand, dimethyl ether 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's production of dimethyl ether is mainly concentrated in the United States, Germany, the Netherlands and Japan and other countries, the world in 2002 (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. The main foreign producers of dimethyl ether are the United States 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 manufacturers of dimethyl ether manufacturer name Serial capacity (tons / year) 1 Dopnt (U.S.) 3.0 2 DEA (Germany) 6.5 3 United Rhine Lignite Fuels (Germany) 3.0 4 AKZO (Netherlands) 3.0 5 Sumitomo Corporation (Japan) 1.0 6 DEA (Australia) 1.0 7 Mitsui East Pressure (Japan) 0.5 > 8 Kang Sheng (Japan) 1.8 9 NKK (Japan) 1.0 Total 20.8 As DME is a market demand with huge potential, construction of dimethyl ether has become a hot ether globally, and a number of large 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 tpd commercial DME plant capacity. Toyo Engineering Co. completed construction of a single-family viable, 2.5 million tpy 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 built in Australia by a Japanese consortium (Mitsubishi Gas Chemical Company, Nippon Light Metal Company, Mitsubishi Heavy Industries & Itochu Corporation) and is scheduled to be in production in 2006. Main consumption areas DME is used as a solvent and aerosol propellant, and consumed in other areas. Global consumption of DME in 2002 was 150,000 tons/year, and demand in 2005 is expected to be about 200,000 tons/year. DME is a chemical product with excellent performance, safety and cleanliness, and its development prospect is generally favored. More importantly, 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 for the 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 U.S. is increased to 5%, then it will have a demand of 250,000 tons, the market outlook for visible 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's demand in 2005 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 Domestic market analysis In recent years, the production of DME in China's rapid development, there are currently more than a dozen manufacturers, the total production capacity of 31,800 tons / year in 2002, the output is about 20,000 tons or so, the capacity utilization rate is low, about 63%. DME and the ability of the main manufacturers (unit: 10,000 tons / year) Manufacturer name serial production capacity 1 Jiangsu Wuxian 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 5,000 6 Kunshan, Jiangsu, Shaanxi New Fuel Burning Apparatus Co. 5,000 7 Mengcheng County, Anhui Province, 2,500 8 Fertilizer In zhejiang zhuji Xinya chemical company 1000 9 in guangdong province, jiangmen city, 2500 10 yiwu city guangyang chemical company limited nitrogen fertilizer plant factory 2500 11 shanghai shenwei aerosol company 1000 12 shandong jiutai chemical science and technology limited liability company 5000 13 hubei field industry limited company 1500 recently total 31800 dimethyl ether domestic construction boom has been formed, the company plans to launch several technologies to build large-scale dimethyl ether production units through joint ventures and other means. The main projects or plans under construction are as follows: In April 2001, New Fuel Furniture Co., Ltd. signed a joint development with the United States Mega Transportation Resources Ltd. "Coal-based one-step synthesis of 200,000 tons / year of dimethyl ether ultra-clean fuels," the project agreement, the project's total investment of 203 billion yuan, 90% of the U.S. investment. Ningxia coal-based dimethyl ether project 830,000 tons / year, plans to invest 478 billion yuan, to use foreign investment, 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 DME device, the second set of 100,000 tons / year DME device, has begun construction. Chemical Co., Ltd. Shandong Linyi Luming is building 30,000 tons / year dimethyl ether plant, using self-developed gas-liquid two-step process technology. Annual/> Shandong Huaxing Group annual output, 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. In addition, 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 aerosol, aerosol and spray coating propellant consuming DME 18,000 tons 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. It is also used in the synthesis of fine chemicals such as dimethyl ether sulfate, consuming about 11,000 tons. Since the nature of DME and LPG is similar, easy to store, 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 a lot since the beginning of 2002, 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 calculation, need 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. As dimethyl ether has excellent fuel properties, 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. Unparalleled comprehensive advantages. Annual consumption of diesel fuel in 2002 was 76.62 million tons, year-on-year increase in diesel fuel consumption is very fast, 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, the whole of about 6.74 million tons in 2010. All in all, our DME is expected to reach about 5-6 million tons of demand in 2005 along with the aerosol and chemical side of the demand. DME consumption 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 is growing fast and the market size is quite impressive. 2 Technical Analysis The production methods of dimethyl ether are one-step and two-step. DME is synthesized by the one-step method, the two-step synthesis is defined from the methanol in the synthesis gas, and then the DME is dehydrated in the feed gas. ● The latter step The law is converted or gasified to produce syngas from natural gas, the syngas enters the synthesis reactor in which the methanol is synthesized and methanol dehydrated to react and convert while completing the 2 The reaction product is a mixture of methanol and dimethyl ether and the mixture is passed through the distillation separator unit, the dimethyl ether, and the un-reacted methanol is returned to the synthesis reactor. Multi-step Bifunctional catalysts, whose catalysts are generally physically mixed two types, one type for methanol synthesis catalysts such as Cu-Zn-Al system (O)-based catalysts, BASFS3-85 and ICI-512, and so on; and those for methanol dehydration catalysts, such as alumina, porous silica - alumina, Y-zeolite, ZSM-5 zeolites, mercerized zeolites, and so on. ● The two-step method was carried out in two steps, i.e., first synthesize the solid catalyst for DME in methanol dehydration by synthesis gas of methanol. γ-Al2O3/SiO2, which is more used domestically, was fabricated with ZSM-5 molecular sieves as catalysts for dehydration. The reaction temperature is controlled at 280340 ℃, pressure 0.5- for 0.8 MPa. The one-way conversion of methanol is 70-85%, and the selectivity of DME is greater than 98%. There is no intermediate one-step synthesis of dimethyl ether methanol synthesis process, compared with the two-step method, the process is simple, less equipment, low investment, low operating costs, so that the production cost of dimethyl ether is reduced, the economy is better. 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 Air Chemical Products Japan NKK process and technology. Two-step synthesis of dimethyl ether is the main dimethyl ether production technology at home and abroad, the law ground refined methanol as raw material, through the amount of less, dehydration reaction by-product, 99.9%, dimethyl ether purity, mature technology, wide device adaptation, processing is simple, can be built directly in the methanol production 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 dimethyl ether technology of the use of two-step large-scale construction projects, indicating that the two-step method has a strong comprehensive competitiveness. 2.1 Major foreign technologies (1) Topsφe process Topsφe syngas one-step process is a new technology developed specifically for natural gas feedstock. The gas-making part in the selection 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. An adiabatic reactor with multiple cooling stages is built in to obtain high conversion between CO and CO2 for the synthesis of DME. 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. Operating conditions of 4.2 MPa and 240290°C Topsφe process were selected. At present, the process has not been built into a commercial plant. 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 has successfully developed a new technology for liquid dimethyl ether, referred to as LPDMETM. The main advantage of the process LPDMETM is the use of a slurry bubbling bed reactor discarding 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 is easy to load and unload catalysts 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/day pilot plant, and the test process was a satisfactory result, 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. Selection of raw materials natural gas, coal, LPG, etc.. The first step in the process is to first gasify the syngas, which 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 to 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 tons / DME synthesis year by syngas production of semi-industrial plant was built in Niigata. 2.2 Cases of domestic technology and scientific research across the country In the 1990s methanol vapor method (two-step) DME production technology and catalyst development, and soon established industrial production facilities. In recent years, with the rise of 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, and has built 5,000 tons/year production unit, after a year of practice 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, which is 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 tons of two-step DME production plant in cooperation with Japan Toyo Engineering Company LTH, to develop a successful test. The equipment is a reasonable process, optimize the 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 in a very positive aspect, as well as a number of research institutions and universities. Portland Pathfinder Maryland Compound Fertilizer Plant Research 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 good catalytic performance, CO conversion rate of 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 ℃ conditions, 4-6 MPa, one-way 55% to 65% CO conversion, the selectivity of DME for 90-94%.