Product name: dichloromethane
Packing mark: toxic
Packaging category: Ⅱ
Physical and chemical properties
Appearance and properties: colorless transparent liquid
Melting point (℃): -96.7
Heat of combustion (kJ/mol): 604.9
Boiling point (℃): 39.8
Relative density (water=1): 1.33
Relative density (air=1): 2.93
Critical temperature (℃): 237
Saturated vapor pressure (kPa): 30.55 (10℃)
Critical pressure (MPa): 6.08
Lower explosive limit〔％ (V/V)〕: 12
Upper explosive limit〔％ (V/V)〕: 19
Ignition temperature (℃): 615
Maximum explosion pressure (MPa): 0.490
Flash point (℃): NA
Partition coefficient of Octanol/water (kPa): 1.25
Solubility: slight Soluble in water, soluble in alcohol, ether.
Uses: used as a solvent for resins and plastics industry
Pathways: inhaled, ingested, absorbed through the skin
This product has a narcotic effect, primarily damage the central nervous and respiratory systems. Acute poisoning: mild cases may have dizziness, headache, vomiting, and eye and upper respiratory tract irritation; heavier appeared irritability, unsteady gait, ataxia, lethargy, can cause chemical bronchitis. In severe cases, coma, may have pulmonary edema. Blood carboxyhemoglobin levels increased. Chronic effects: long-term exposure mainly headache, fatigue, dizziness, loss of appetite, slow movements, lethargy. Degreasing of skin diseases as there is, causing dry, off quiet and chapped. Explosion risk: This product is combustible, toxic, irritating.
Acute toxicity: LD50: 1600 ~ 2000mg / kg (rat oral); LC50: 88000 ~ 2000mg / m, 1/2
Hours (rat inhalation). Irritation: a rabbit eyes: mammalian somatic mutation can cause irritation. Rabbit Skin: 500mg / 24h, moderate stimulus. Rabbit Skin: cause central nervous system, eyes, ears, hair filling abnormalities cause respiratory irritation. Cause eye irritation. Subacute and chronic toxicity: rats inhaled 4.69g / m, 8 hours / day, 75 days, no pathological changes. Exposure time increases, mild liver atrophy, fatty degeneration and cell infiltration. Mutagenicity: slight biological mutagenicity: Salmonella typhimurium 5700ppm. Inhibition of DNA: human fibroblasts 5000 ppm / hour (continuous). Cancer: IARC carcinogens comments: positive animals, human beings are not clear. Other toxicological effects: rat inhalation poisoning minimum concentration (TCLO): 1250 ppm / 7 hours (progesterone 6 ~ 15 days), cause musculoskeletal abnormalities, urinary system abnormalities dying.
Hazardous characteristics: with the fire or hot objects can produce highly toxic phosgene contact. Case humid air hydrolysis slight amount of hydrogen chloride, light can also promote hydrolysis corrosive metal reinforcement. Hazardous combustion products: carbon monoxide, carbon dioxide, hydrogen chloride, phosgene. Fire fighting methods: firefighters are required to wear gas masks, body wear firefighting suits, the wind on fire. Cooling water containers, if possible to move containers from the scene empty Department. Extinguishing Media: water spray, foam, CO2, sand.
Stability and reactivity:
Hazardous Polymerization: No aggregation
Conditions to be avoided: Light
Materials to avoid: alkali metals, aluminum
Closed operation, local exhaust. The operator must go through specialized training, strict adherence to rules. Proposed operators wear protective masks Direct (half-mask), wearing chemical protective safety glasses, wear protective overalls on infiltration, wearing anti-chemical gloves. Away from fire, heat, workplace smoking. Use explosion-proof ventilation systems and equipment. Prevent vapor leakage into the workplace air. Avoid contact with alkali metals. When moving to light light unloading, prevent damage to packaging and containers. Equipped with the appropriate variety and quantity of
Fire-fighting equipment and spill response equipment. Empty containers may be harmful residues.
Store in a cool, ventilated warehouse. Away from fire, heat source. Storage temperature does not exceed 30 ℃, relative humidity less than 80%. Keep container closed. Should alkali metals, food chemicals stored separately, avoid mixing reservoir. Equipped with the appropriate variety and quantity of fire equipment. Storage areas should be equipped with spill response equipment and materials suitable host.
Transport preceded by checking whether container integrity, sealing, transport process to ensure that the container does not leak, did not collapse, did not fall, no damage. Strictly prohibited and acids, oxidant, food and food additives mixed operation. Transport vehicles should be equipped with the appropriate variety and quantity of fire equipment and spill response equipment when lost. Transit should be anti-exposure, rain, high temperature. Highway transportation according to provisions of the route.
Skin contact: Remove contaminated clothing, use soap and water thoroughly washed skin. Eye contact: immediately open from top to bottom eyelid, mobile water or saline rinse. Medical treatment. Inhalation: rapidly from the scene to fresh air. Maintain smooth breathing. If breathing is difficult, give oxygen. If breathing stops, artificial respiration immediately. Medical treatment. Ingestion: drink enough water, induce vomiting. Medical treatment.
ACCIDENTAL RELEASE AND DISPOSAL:
Emergency Action: rapid withdrawal from air leakage personnel to a safe area, and isolation and strict restrictions on access. Cut off the fire source. Recommended emergency personnel wearing self-Pressurized respirators to wear protective clothing. Cutting spill contingency leak source as possible. Prevent entry into sewers, flood discharge trench so restrictive space. A small leak: sand or other noncombustible materials adsorption or absorption. Large leak: to build a causeway or trenching asylum. Foam coverage, lower vapor disasters. With the transfer pump to tankers or exclusive collector, recycling or shipped to the waste disposal sites.
Waste disposal method: disposal by incineration. Mixed with the fuel, and then burned. Incinerators emit hydrogen halide is removed by pickling.
Maximum allowable concentration MAC (mg / m3): China: 200 degrees of the Soviet Union 50 (mg / m)
Engineering controls: closed operation, local exhaust ventilation
Closed production process, comprehensive respiratory system preventing possible exposure to vapor, wear self-absorption filter respirators (full cover). ventilation. Provide safety shower and eyewash equipment protection
Respiratory protection: concentration in air overweight, they should wear protective masks Direct (half-mask). Emergency rescue or evacuation, it is recommended to wear air respirators
Eye protection: when necessary, wearing chemical protective glasses full
Physical protection: anti-virus penetration overalls
Hand protection: Wear gloves against chemicals
Other protection: No smoking, eating and drinking. Workers completed, take a bath. Separate storage of toxic pollution by the clothes, washed standby. Pay attention to personal hygiene.