Dichloromethane CAS 75-09-2,Dichloromethane, CAS 75-09-2
Molecular formula: CH₂Cl₂, Molecular weight: 84.93, Boiling point: 39.75℃ (760 mmHg), Melting point: -95℃ to -97℃, density: 1.322 to 1.326 g/cm³ (at 20℃).
75-09-2
CH2Cl2
84.93
200-838-9
| CAS | 75-09-2 |
| Molecular formula | CH2Cl2 |
| Molecular weight | 84.93 |
| EIENCS | 200-838-9 |
| Form | Liquid |
| Melting point | -97°C |
| boling point | 39.8-40°C mm Hg |
| Density | 1.325 g/mL at 25°C |
| Solubility | Slightly soluble in water (about 20 g/L), and completely miscible with organic solvents such as ethanol, ether and acetone |
| PKA | / |
| Color | APHA: ≤10 |
| Storage temp |
Chemical properties
Molecular formula: CH₂Cl₂, Molecular weight: 84.93, Boiling point: 39.75℃ (760 mmHg), Melting point: -95℃ to -97℃, density: 1.322 to 1.326 g/cm³ (at 20℃).
Solubility: Slightly soluble in water (about 20 g/L), and completely miscible with organic solvents such as ethanol, ether, and acetone.
Stability: It is not flammable at normal temperature, but when mixed with high-concentration oxygen, it can form explosive mixtures (explosion limit 13% to 22%). It decomposes in high-temperature or humid environments to produce phosgene (COCl₂) and hydrogen chloride, which are highly toxic.
Core value: Dichloromethane, with its strong solubility and low boiling point, has become an irreplaceable industrial solvent, but its carcinogenicity and environmental risks need to be strictly controlled.
Selection suggestion
Pharmaceutical/Electronic grade: Jiangsu Meilan (natural gas process) or high-purity (99.9%) products are preferred.
Cost control: For industrial cleaning, Shandong Jinling (coal-based process) is an option. The 250kg large package reduces the unit price.
Risk Prevention and control
Avoid high-temperature operations to prevent the generation of phosgene.
Regularly monitor the concentration of the working environment (limit ≤50ppm)
Industrial solvent
Metal degreasing, paint stripping (paint remover), polyurethane foaming agent.
Film production (accounting for 50% of China's consumption) and pharmaceutical synthesis (accounting for 20%).
Pharmaceutical manufacturing: Used for antibiotic synthesis (such as ampicillin, cephalosporin) and drug extraction.
Other uses:
Refrigerants (air conditioning systems), caffeine removers, aerosol propellants.
Commonly used solvents in laboratories, suitable for chromatographic analysis and organic synthesis.
Health hazard
Acute toxicity: Inhaling high-concentration vapors causes headache, dizziness and pulmonary edema. Oral administration of 20 to 50 mL can cause mild poisoning, and 100 to 150 mL can be fatal.
Chronic effects: Long-term exposure can cause liver and kidney function damage and neurasthenia syndrome. The International Agency for Research on Cancer (IARC) has classified it as a Group 2A carcinogen (possibly carcinogenic to humans).
Environmental risk: Toxic to aquatic organisms and can accumulate in groundwater; It degrades in the atmosphere to form phosgene and carbon monoxide.
Key control Measures in China (2023 List) :
The production of paint strippers containing dichloromethane is prohibited.
Prohibited in cosmetics and content limit in industrial cleaning agents
Enterprises need to carry out pollutant discharge monitoring and establish a system for identifying potential soil pollution risks.
Operations and Emergency Response
Protective requirements: Wear gas masks, chemical protective suits and gloves. Eating and drinking are prohibited in the workplace.
Leakage treatment: For small leaks, use sand and soil to absorb them. For large leaks, build embankments to contain them, cover them with foam, and then transfer and dispose of them.
Fire extinguishing method: Use a mist water, carbon dioxide or dry powder fire extinguisher, and avoid directly flushing the liquid.
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