Hazard characteristics of the hottest acetylene an

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Hazard and hazard characteristics of acetylene and raw materials required for production

acetylene is a flammable and explosive gas with wide explosion limit (2.3 ~ 81% in the air), small ignition energy (minimum 0.02mj), and low spontaneous combustion point (305 ℃ in the air). There are impurities such as phosphorus and sulfur in acetylene, which has a lower self ignition point and greater risk. Acetylene forms an explosive mixture with air or oxygen, which is very easy to cause combustion and explosion in case of open fire, high temperature, static electricity, friction, radioactivity and other ignition energy. In contact with fluorine, chlorine, etc., there will be violent chemical reactions, and in reaction with copper, silver, mercury and other metals, there will be the risk of compound explosion. Pure acetylene will also decompose and explode when it meets ignition energy under high pressure. Acetylene also has a weak anesthetic effect and belongs to the slightly toxic category. Inhalation of high concentration acetylene will cause nausea, headache and even coma and suffocation. When phosphine and hydrogen sulfide are present in acetylene, carbon fiber composites become the best choice for vehicle lightweight, which increases toxicity and harm

2. Hazard and hazard characteristics of raw materials for production of dissolved acetylene

in the process of production of dissolved acetylene, the commonly used hazardous chemicals and their hazards are:

2.1 calcium carbide, as the main raw material for acetylene production, is a flammable material when wet. It will not burn itself, but it can produce acetylene when encountering water or moisture, which has the risk of combustion or explosion. Calcium carbide dust is harmful to human body

2.2 acetone is the necessary solvent for filling dissolved acetylene cylinders, which is a low flash point flammable liquid. It has low boiling point and is easy to volatilize. It forms an explosive mixture with air and is easy to burn and explode in case of open fire and high heat. 3. The combustion performance can reach the level of UL94V-0. The specific gravity of steam is heavier than that of air, and it can spread to a relatively far place at a lower place, which will ignite when encountering the fire source. In case of high heat, the internal pressure of the container increases, and there is a risk of cracking and explosion. Inhalation will cause headache and nausea, and it has anesthetic effect on the central nervous system. In severe cases, vomiting, convulsion and even coma occur. Long term repeated skin contact can cause dermatitis

2.3 as a purifying agent for acetylene production, sulfuric acid is an acidic corrosion product. With the increase of function, it will react violently with inflammables and organic substances, and even cause combustion. It can react with some active metal powders and release hydrogen. In case of a large amount of heat release in water, boiling and splashing may occur. It has strong corrosivity and is a strong oxidant. It has strong stimulation and corrosion effect on human skin, eyes, mucous membranes and other tissues

these two chemicals are important raw materials for the production of polycarbonate

2.4 sodium hypochlorite is also a commonly used purification agent for acetylene production, which is corrosive and strong oxidizing. The stability is poor, it is easy to decompose, and the storage time is short. The chlorine produced by decomposition is a highly toxic asphyxiating gas, which will chlorinate with acetylene and cause explosion. It can irritate human eyes and respiratory mucosa. In severe cases, it can cause coma, pulmonary edema, and even death

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