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.

In methanol production plants, the relevant departments of our country stipulate that the concentration of methanol in the air is limited to PC-stel=50mg/m3 and PC-TWA=25mg/m3. When working in the field with methanol gas, you must wear a gas mask, and the factory wastewater must be treated before it can be discharged. The allowable methanol content is less than 200mg/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.

Extended data:

Methanol technology is developing rapidly, and the main trends are as follows:

1. Production raw materials are shifted to natural gas and hydrocarbon processing tail gas. According to the actual situation of methanol production, using natural gas as raw material can reduce the investment by 50% compared with using solid as raw material; Using acetylene tail gas has more remarkable economic benefits.

90% of the raw materials for methanol production in the world are natural gas, and only 2% are coal. The proportion of coal-to-methanol in China is increasing gradually, which is related to the energy structure of China.

2. Mass production, with the largest scale of a single series reaching 2.25 million tons &; In 2000, the daily output of OUML in a single season was 7,500 kg. After the scale is expanded, the investment and cost per unit product can be reduced.

3. Fully recover the heat of the system. Produce steam with economic pressure to drive compressor, boiler feed water pump, steam turbine and circulating water pump to realize comprehensive utilization of heat energy.

4. A new methanol synthesis tower with by-product medium pressure steam is adopted to reduce energy consumption.

5. Energy-saving technologies such as hydrogen recovery technology, pre-conversion, process condensate saturation technology and combustion-supporting air preheating technology are adopted to reduce methanol consumption.

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