With good ventilation, there should be no problem.
A small amount of inhalation is harmless.
Long-term inhalation of spindle steam can lead to blindness.
Question 2: Why is methanol toxic? Methanol is absorbed through respiratory tract and digestive tract, and can also be absorbed through skin. It is distributed in cerebrospinal fluid, blood, bile and urine, with the highest content, and the lowest content in bone marrow and adipose tissue. Methanol is slowly oxidized and excreted in the body, so it has obvious accumulation effect. The main toxic mechanism of methanol is:
① It has anesthetic effect on nervous system;
(2) Methanol is metabolized into formaldehyde and formic acid by dehydrogenase, which inhibits some oxidase systems, causes aerobic metabolism disorder, and causes acidosis due to the accumulation of organic acids such as lactic acid in the body;
③ Due to the high content of methanol and its metabolites formaldehyde and formic acid in aqueous humor and eye tissue, the retinal metabolism is disordered, which is easy to cause damage to retinal cells and optic nerve and demyelination of optic nerve.
Methanol has a binding site between nerve cells and some organs, where it produces toxic effects, while ethanol does not, so methanol is toxic and ethanol does not.
Although ethanol also has anesthetic effect on nerves, its toxicity is not as good as that of methanol, and it is easy to be eliminated and decomposed.
Question 3: What is methanol? Is it harmful to people? Methanol is an organic compound and the simplest alcohol. Methanol is light, volatile, colorless, flammable and toxic. Usually used as solvent, antifreeze, fuel or neutralizer. Methanol can burn completely in the air, and release carbon dioxide and water: the flame of 2 CH3OH+3 O2 → 2 CO2+4 H2O methanol is almost colorless, so be extra careful when igniting methanol to avoid being burned.
Many bacteria produce methanol during anaerobic metabolism. So there is a small amount of methanol vapor in the air, but within a few days it will be oxidized by oxygen in the air under the irradiation of sunlight and become carbon dioxide.
Question 4: Why is methanol toxic and ethanol not? Methanol is metabolized by human body to produce formaldehyde and formic acid, which is harmful to human body. Ethanol will be oxidized in the human body, and the produced CO2 will be excreted through the respiratory tract. Ethanol is also toxic, slightly toxic, and alcoholism in life! The other is whether "poison" is relative to biology. In the process of evolution, people gradually formed a detoxification mechanism. After all, ethanol is the product of rotten fermented plants, and early people don't know how many rotten creatures they ate.
Question 5: Is the smell of methanol poisonous? Methanol is a colorless, transparent, flammable and volatile toxic liquid, which is absolutely toxic.
Question 6: How harmful is methanol to the skin? 50 minutes of methanol (methanol, drying, methane? OH) is a saturated monohydric alcohol with the simplest structure, with CAS number of 67-56- 1, 170082- 17-4, molecular weight of 32.04 and boiling point of 64.7℃. It is also called "lignin alcohol" or "lignin essence" because it was first discovered in dry distillation wood. It is a colorless, alcoholic and volatile liquid. The lowest dose of human oral poisoning is about 100mg/kg body weight, and 0.3 ~ 1 g/kg can cause death. It is used to make formaldehyde, pesticides and so on. And used as extractant of organic matter and denaturant of alcohol. It is usually produced by the reaction of carbon monoxide and hydrogen.
Methanol is a well-known toxic substance. Industrial alcohol contains about 4% methanol. If it is used as edible alcohol by criminals to make fake wine, it will cause methanol poisoning after drinking. The lethal dose of methanol is about 70 ml.
The toxicity of methanol has the greatest influence on the nervous system and blood system of human body. Intake through digestive tract, respiratory tract or skin will produce toxic reaction, and methanol vapor can damage human respiratory mucosa and vision. Symptoms of acute poisoning include: headache, nausea, stomachache, fatigue, blurred vision and even blindness, and then dyspnea, eventually leading to respiratory center paralysis and death. Chronic toxic reactions are dizziness, lethargy, headache, tinnitus, decreased vision and digestive system disorder. If the intake of methanol exceeds 4g, poisoning reaction will occur; If a small cup of methanol exceeds 10g by mistake, it will lead to blindness and death. The lethal dose is more than 30 ml, and methanol is not easy to be discharged in the body, but will accumulate. Formaldehyde and formic acid generated by oxidation in the body are also toxic. In the methanol production plant, the relevant departments of our country stipulate that the allowable concentration of methanol in the air is 50mg/m3, and gas masks must be worn when working in the field with methanol gas. The factory wastewater can only be discharged after treatment, and the allowable content of methanol is less than 200 mg/L. ..
The poisoning mechanism of methanol is that methanol is metabolized by human body to produce formaldehyde and formic acid (commonly known as formic acid), and then it is harmful to human body. Common symptoms include: feeling drunk, headache, nausea, vomiting and blurred vision after one or several hours. In severe cases, people will be blind and even die. Causes of blindness: formic acid, a metabolite of methanol, accumulates in the eyes and destroys visual nerve cells. Brain nerves can also be damaged, causing permanent damage. When formic acid enters the blood, it will make the tissues more and more acidic, damage the kidneys and lead to renal failure.
Methanol poisoning can usually be detoxified with ethanol. The principle is that methanol itself is non-toxic and its metabolites are toxic, which can be detoxified by inhibiting metabolism. The metabolism of methanol and ethanol in human body is the same enzyme, and this enzyme has greater affinity with ethanol. Therefore, people with methanol poisoning can relieve methanol metabolism by drinking strong liquor (alcohol content is usually above 60 degrees), and then excrete it. Formic acid produced by methanol metabolism can be neutralized by baking soda (sodium bicarbonate).
Contact restriction
Methanol has low toxicity to human body, because methanol will be oxidized into formaldehyde and formic acid (formic acid) which are more toxic than methanol in human metabolism, so drinking alcohol containing methanol will lead to blindness, liver disease and even death. If you drink more than 4 ml by mistake, you will have poisoning symptoms. If you drink more than 10 ml, you will be blind due to permanent damage to the optic nerve, and 30 ml can already lead to death.
The initial symptoms of poisoning include rapid heartbeat, abdominal pain, vomiting (vomiting), diarrhea, loss of appetite, headache, dizziness and general weakness. In severe cases, people will be unconscious and have shortness of breath to failure. Blindness is its most typical symptom. When methanol enters the blood, it will make the tissue acidic, cause acidosis and lead to renal failure. The worst thing is death.
However, there are still many unscrupulous businessmen who blend fake wine with industrial alcohol containing methanol and sell it regardless of life and death. But there is also a very small amount of methanol in the genuine wine, which is also one of the reasons for the hangover. Methanol poisoning can be detoxified with ethanol. Because methanol is oxidized to formaldehyde by alcohol dehydrogenase in the liver, and then formic acid is generated. Ethanol can compete with methanol for ethanol dehydrogenase, giving the human body time to eliminate methanol.
Poisoning symptoms and measures
Physical hazard: it has anesthetic effect on the central nervous system; It has a special selective effect on optic nerve and retina, causing pathological changes; Can cause metabolic acidosis.
Acute poisoning: mild upper respiratory symptoms after short-term inhalation (gastrointestinal symptoms after oral administration); After a period of incubation, headache, dizziness, fatigue, dizziness, drunkenness, confusion, delirium and even coma appear. Optic nerve and retinopathy may include blurred vision, diplopia and even blindness. Metabolism >>
Question 7: Is alcohol-based fuel toxic? I heard that methanol is poisonous! ! Experts suggest that the main component of alcohol-based fuel is methanol. How can methanol not be toxic? But it doesn't matter, refined methanol is low in toxicity; But if crude methanol or waste methanol is used, it should be toxic or even highly toxic, so it must be toxic. But most importantly, look at your burner. I tell you clearly that as long as it is atomized combustion, it is very toxic, far more toxic than methanol. The main products of atomization combustion are formaldehyde, carbon monoxide, carbon dioxide and other harmful gases. Formaldehyde is a carcinogen, which everyone should know; To sum up, alcohol-based fuel is certainly toxic, but the most terrible thing is that if atomized combustion is used, it is more toxic and can be said to be seriously harmful to the body. If gasification combustion is used, the technical difficulty is too great, and the problem of carbon deposition can not be solved generally, let alone other technical requirements; If the technical problems can be solved and gasification combustion can be realized, it can be used safely. It should be said that the toxicity is relatively small, and some of them should meet the national standards and environmental protection standards according to different processes. Follow-up: Actually, alcohol fuel is a kind of clean energy, so it is toxic and inedible. As a fuel, there is not much problem. Follow-up: Is the smell not toxic? Another question is whether the filling is safe. Answer: Generally speaking, alcohol fuels burn more fully than other fuels. When burning diesel oil, the concentration of sulfur dioxide is 5 mg/m3, nitrogen oxides are not detected, and the measured concentration of carbon monoxide is 2436mg/m? , the oxygen content of flue gas is 9.9%; Sulfur dioxide and nitrogen oxides were not detected when burning alcohol-based liquid fuel, and the measured carbon monoxide concentration was 24mg/m? , the oxygen content of flue gas is 7.65438 0%. Compared with diesel fuel, the measured concentration of carbon monoxide in the flue gas of fuel is greatly reduced. Therefore, it is more environmentally friendly than it. For alcohol-based liquid fuel, filling is generally safe, and now it is mainly filling. They are all chemicals rather than edible products, so in this definition, they are basically toxic. Methanol itself is called industrial alcohol, which is the main raw material of fake wine. Drinking it will cause blindness. Other polyols are industrial products, and ethylene glycol is a lubricant and antifreeze.