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Dongying Rich Chemical Co.,Ltd

Environmental behavior and stability of dichloromethane

Dichloromethane Hazardous characteristics: in case of high heat heat can burn. Thermal decomposition can produce highly toxic phosgene. In case of high fever, the container pressure increases, there is the risk of cracking and explosion.

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

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Environmental effects: 

1. Human pollution sources Dichloromethane can be placed in the atmosphere in the following ways:as  propellant, paint scavenger, metal to oil agent.

2. Air flow cloth: dichloromethane into the atmosphere and hydroxyl radical reaction and decomposition, the half-life of several months.

3. Biodegradable: methylene chloride under sufficient oxygen, and sewage seed or activated sludge reactor, will be fully biodegradable between 6 hours to 7 days.

4. Bioaccumulation Although the lack of experimental data, but because of methylene chloride octanol and water partition coefficient is low, it can be inferred that it will not have the phenomenon of bioconcentration.

5. Since the water / soil volatile methylene chloride, the Henry's Law constant is very high, very quickly and steadily evaporates from water, which is evaporated from the water for half a lifetime of 3-5.6 hours.

Stability:

1. Toxicity is very small, and poisoning after the rapid recovery, it can be used as anesthetic. Irritating to the skin and mucous membranes. Young adult rats oral LD50: 1.6 mL / kg. The maximum allowable concentration in the air 500 × 10-6. Operation should wear gas masks, found immediately after poisoning from the scene, symptomatic treatment. Minimal in the chloride of methane. Violent narcotic, a lot of inhalation can cause acute poisoning, nasal pain, headache, vomiting and other symptoms. Chronic poisoning can cause vertigo, fatigue, loss of appetite, hematopoietic damage, red blood cells reduced. Liquid Dichloromethane is in contact with skin to cause dermatitis. Rats were inhaled at a concentration of 90.5 g / m3 for 90 minutes. Olfactory threshold concentration of 522mg / m3, the maximum allowable concentration of workplace 1740mg / m3.

2. Stability: stable.

3. Dichloromethane Forbidden materials: alkali metal, aluminum.

4. Avoid contact conditions: light, moist air.

5. Dichloromethane Polymerization hazards: non-polymerization.

6. Decomposition products: hydrogen chloride, phosgene.


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