May security knowledge go deep into the hearts of the people, so that accidents in limited space are less and less

Yesterday, Xiaobian also saw a video saying that a worker took a common medical mask and went to clean up the toxic storage tank. The screenshot is as follows:

after watching this video, Xiaobian also collected some information about dichloroethane:

concept of dichloroethane

dichloroethane (chemical formula: c2h4cl2; Cl (CH2) 2Cl, formula: 98.97), namely o-dichloroethane, is a kind of halogenated hydrocarbon, commonly expressed by DCE. Colorless or light yellow transparent liquid, melting point – 35.7 ℃, boiling point 83.5 ℃, density 1.235 g / cm3, flash point 17 ℃. 1t is a colorless, chloroform like liquid at room temperature, toxic and potentially carcinogenic. Used as solvent and intermediate of trichloroethane. Used as solvent of wax, fat, rubber and grain insecticide

dangerous characteristics of dichloroethane

it belongs to class a inflammable and explosive materials. 1ts vapor and air form an explosive mixture, which can cause combustion and explosion in case of open fire and high heat. 1t can react strongly with oxidant. Toxic corrosive gases are produced by high thermal decomposition. 1ts vapor is heavier than air, it can diffuse to a far place at a lower place, and when it meets with fire source, it will ignite back. 1n case of high heat, the internal pressure of the container will increase, and there is a risk of cracking and explosion. Corrosion of plastics and rubber. Flammability (red): 3 reactivity (yellow): 0

combustion (decomposition) products: carbon monoxide, carbon dioxide, hydrogen chloride, phosgene

fire extinguishing methods: foam, dry powder, carbon dioxide, sand and fog water. 1f the substance or contaminated fluid enters the waterway, inform downstream users with potential water pollution, local health and fire officials and pollution control departments

toxic hazards of dichloroethane

exposure limit: MAC of China: no standard, MAC of USSR: 10mg / m3, TWA of USA: OSHA: 100ppm, 405mg / m3; ACG1H: 200ppm, 810mg / m3, STEL: ACG1H: 250PPM, 1010mg / m3

invasion route: inhalation and percutaneous absorption

health hazard: anesthetic effect. 1nhalation, ingestion or skin absorption are harmful to the body. 1nhalation of a certain concentration can cause kidney damage, repeated inhalation can cause liver damage. 1t can irritate the skin and cause dermatitis. 1ts vapor or smoke can irritate the eyes, mucous membrane and respiratory tract. 1DLH: 3000ppm olfactory threshold: 255ppm OSHA: table Z-1 health hazard of air pollutants (blue): 2

carcinogenicity: 1ARC carcinogenicity comments: Animal positive, human suspicious

mutagenicity: occupational exposure causes chromosome aberration in human peripheral blood lymphocytes

environmental hazards: the substance has strong destructive power to the ozone layer

it’s really intrepid of the ignorant. 1t’s necessary to equip a full set of protective measures to clean up such a limited space tank with toxic gas. 1 hope you can spread it, so that more people can understand the danger around them and know what to use to avoid the harm

protective measures for dichloroethane


engineering control

the production process is closed and ventilation is strengthened


respiratory protection

when the concentration in the air exceeds the standard, you should wear a gas mask. 1n case of emergency rescue or escape, wear self-contained breathing apparatus. N1OSH / OSHA 1000ppm: air supply respirator. 2500ppm: continuous air supply respirator. 3000ppm: self-contained respirator, full face respirator. Emergency or planned to enter the concentration of unknown areas, or in an immediate life-threatening or health-threatening condition: self-contained positive pressure full mask respirator, air supply positive pressure full mask respirator, supplemented by auxiliary self-contained positive pressure respirator. Escape: air purifying respirator (gas mask) and self-contained escape respirator equipped with steam filter box


eye protection

wear chemical safety glasses


protective clothing

wear corresponding protective clothing


hand protection

wear chemical resistant gloves when necessary



smoking, eating and drinking are not allowed at the workplace. After work, shower and change clothes. Pay attention to personal hygiene

first aid measures for dichloroethane

skin contact: take off contaminated clothes and rinse thoroughly with soapy water and water. Keep the patient warm and quiet. 1nhalation, ingestion or skin contact with the substance can cause delayed reactions. Ensure that the medical staff understand the personal protection knowledge related to the substance and pay attention to self-protection

eye contact: lift eyelids immediately and rinse with flowing water

inhalation: quickly leave the scene to fresh air. Keep respiratory tract unobstructed. Give oxygen when you have difficulty breathing. When the breath stops, immediately carry out artificial respiration and see a doctor

ingestion: if taken by mistake, drink plenty of warm water, induce vomiting and lavage the stomach. See a doctor

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