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Methylene Chloride

 化学構造式
75-09-2
CAS番号.
75-09-2
化学名:
别名:
英語化学名:
Methylene Chloride
英語别名:
AEROTHENE;PLASTISOLVE;DICHLORMETHANE;DICLOROMETHANE;MethylDichloride;METHYLEN CHLORIDE;METHYLENE CHLORID;METHYLENE CHLORIDE;DICHLOROMETHANE 300;METHYLENI CHLORIDUM
CBNumber:
CB0181994
化学式:
CH2Cl2
分子量:
84.927
MOL File:
Mol file

Methylene Chloride 物理性質

融点 :
−97 °C(lit.)
沸点 :
39.8-40 °C mm Hg(lit.)
比重(密度) :
1.325 g/mL at 25 °C(lit.)
蒸気密度:
2.9 (vs air)
蒸気圧:
24.45 psi ( 55 °C)
屈折率 :
n20/D 1.424(lit.)
溶解性:
Slightly soluble (1.38 g/100 mL) in water at 20°C; soluble in carbon tetrachloride; miscible in ethanol, diethyl ether and dimethylformamide (Lide, 1995; Budavari, 1996)
外見 :
Liquid
色:
Colorless to yellow
Relative polarity:
0.309
臭い (Odor):
penetrating ether-like odour
臭気閾値(Odor Threshold):
The odour threshold of dichloromethane is about 200 ppm [694 mg/m3] (Stahl,1973).
安定性::
Vapour is nonflammable and is not explosive when mixed with air (Budavari, 1996) but may form explosive mixtures in atmospheres with higher oxygen content (Sax, 1984)

安全性情報

主な危険性  Xn
Rフレーズ  40
Sフレーズ  23-24/25-36/37
RIDADR  UN 1593 6.1/PG 3
WGK Germany  2
RTECS 番号 PA8050000
3-10

Methylene Chloride 価格

メーカー 製品番号 製品説明 CAS番号 包装 価格 更新時間 購入

Methylene Chloride 化学特性,用途語,生産方法

用途

製造用剤

物理的性質

A common synonym for methylene chloride is dichloromethane.
Methylene chloride is a colorless liquid with a sweetish odor.
The chemical formula for methylene chloride is CH2Cl2, and the molecular weight is 84.93 g/mol.
The vapor pressure for methylene chloride is 349 mmHg at 20 °C, and it has an octanol/water coefficient (log K ow ) of 1.30.
Methylene chloride has an odor threshold of 250 parts per million (ppm).
Methylene chloride is slightly soluble in water and is nonflammable.

使用

Methylene chloride is predominantly used as a solvent in paint strippers and removers; as a process solvent in the manufacture of drugs, pharmaceuticals, and film coatings; as a metal cleaning and finishing solvent in electronics manufacturing; and as an agent in urethane foam blowing.
Methylene chloride is also used as a propellant in aerosols for products such as paints, automotive products, and insect sprays.
It is used as an extraction solvent for spice oleoresins, hops, and for the removal of caffeine from coffee. However, due to concern over residual solvent, most decaffeinators no longer use methylene chloride.
Methylene chloride is also approved for use as a postharvest fumigant for grains and strawberries and as a degreening agent for citrus fruit.

製造方法

Methylene Chloride was first prepared by Regnault in 1840 by the chlorination of methyl chloride in sunlight. It became an industrial chemical of importance during the Second World War. Two commercial processes are currently used for the production of Methylene Chloride—hydrochlorination of methanol and direct chlorination of methane (Rossberg et al., 1986; Holbrook, 1993).
The predominant method of manufacturing Methylene Chloride uses as a first step the reaction of hydrogen chloride and methanol to give methyl chloride. Excess methyl chloride is then mixed with chlorine and reacts to give Methylene Chloride, with chloroform and carbon tetrachloride as co-products. This reaction is usually carried out in the gas phase thermally but can also be performed catalytically or photolytically. At low temperature and high pressure, the liquid-phase process is capable of giving high selectivity for Methylene Chloride (Rossberg et al., 1986; Holbrook, 1993).
The older and currently less used production method for Methylene Chloride involves direct reaction of excess methane with chlorine at high temperatures (400–500°C), or at somewhat lower temperatures either catalytically or photolytically. Methyl chloride, chloroform and carbon tetrachloride are also produced as co-products (Rossberg et al., 1986; Holbrook, 1993).
World production of Methylene Chloride increased from 93 thousand tonnes in 1960 to an estimated 570 thousand tonnes in 1980 (Edwards et al., 1982) and is believed to be still several hundred thousand tonnes. Production in the United States has shown a steady decline from 1981 to 1993, as shown by the following figures (thousand tonnes): 1981, 404; 1984, 275; 1987, 234; 1990, 209; 1993, 160 (Anon., 1994, 1997). The total amount produced in western Europe ranged from 331 500 tonnes in 1986 to 254 200 tonnes in 1991 (WHO, 1996).

健康ハザード

Methylene chloride is predominantly used as a solvent. The acute (short-term) effects of methylene chloride inhalation in humans consist mainly of nervous system effects including decreased visual, auditory, and motor functions, but these effects are reversible once exposure ceases. The effects of chronic (long-term) exposure to methylene chloride suggest that the central nervous system (CNS) is a potential target in humans and animals. Human data are inconclusive regarding methylene chloride and cancer. Animal studies have shown increases in liver and lung cancer and benign mammary gland tumors following the inhalation of methylene chloride.

化学反応性

Reacts vigorously with active metals (lithium, sodium, potassium) and with strong bases (potassium tert-butoxide) (Sax, 1984)

工業用途

Methylene chloride has been suggested, and indeed is already in commercial use, as a substitute for chlorofluorocarbon auxiliary blowing agents. Methylene chloride is highly volatile (boiling point 39.8°C) and inert in polyurethane-forming mixtures. However, methylene chloride is a suspected carcinogen and has other deleterious effects on workers exposed to it. Accordingly, the concentration of methylene chloride in the air inside a foam plant must be kept low. The American Conference of Governmental Industrial Hygienists recommends that workers not be exposed to more than 50 ppm of the chemical, while the Occupational Safety and Health Administration’s Permissible Exposure Limit is 500 ppm. Keeping the levels of methylene chloride in a foam plant below 50 ppm may require additional ventilation equipment, with an associated increase in costs. In addition, the chemical is a recognized environmental pollutant, and both the federal and state governments are beginning to limit releases of the chemical from plants that employ it. Thus, in the near future, plants using methylene chloride as an auxiliary blowing agent may be faced with the substantial additional expense of installing scrubbers or similar equipment to remove methylene chloride from air and/or other gases discharged from the plant. In addition, California has recently proposed that emissions of methylene chloride in that state be subject to a heavy “pollution” tax, and other states are likely to follow a similar course.

職業ばく露

The principal route of human exposure to methylene chloride is inhalation of ambient air.
Occupational and consumer exposure to methylene chloride in indoor air may be much higher, especially from spray painting or other aerosol uses. People who work in these places can breathe in the chemical or it may come in contact with the skin.
Methylene chloride has been detected in both surface water and groundwater samples taken at hazardous waste sites and in drinking water at very low concentrations.

貯蔵

Prior to working with Methylene Chloride you should be trained on its proper handling and storage.
A regulated, marked area should be established where Methylene Chloride is handled, used or stored as required by the OSHA Methylene Chloride Standard (29 CFR 1910.1052).
Methylene Chloride reacts violently With OXIDIZING AGENTS(such as PERCHLORATES, PEROXIDES PERMANGANATES CHLORATES NITRATES CHLORINE, BROMINE and FLUORINE CHEMICALLY ACTIVE METALS (such as POTASSIUM, SODIUM MAGNESIUM and ALUMINUM) and STRONG BASES(such as SODIUM HYDROXIDE and POTASSIUM HYDROXIDE).
Methylene Chloride is not compatible with liquid oxygen;Titanium and Amines.
Store in tightly closed containers in a cool, well-ventilated area away from Metals and Ligh.
Methylene Chloride attacks some forms OFPLASTIC RUBBER and COATINGS and will corrode iron. some STAINLESS STEELS COPPER and NICKEL in the presence of WATER.

Methylene Chloride 上流と下流の製品情報

原材料

準備製品


Methylene Chloride 生産企業

Global( 72)Suppliers
名前 電話番号 ファックス番号 電子メール 国籍 製品カタログ 優位度
Spectrum Chemical Manufacturing Corp. 18616765336
021-57711696 marketing_china@spectrumchemical.com; China 9686 60
HBCChem, Inc. +1-510-219-6317
+1-650-486-1361 sales@hbcchem.com United States 10657 60
Liaocheng Tongda Chemical Co. LTD 18963573761
18963573761 18963573761@163.com China 115 58

75-09-2()キーワード:


  • METHYLENE CHLORIDE
  • METHYLENI CHLORIDUM
  • DICHLORMETHANE
  • DICHLOROMETHANE 300
  • DICHLOROMETHANE 5000
  • DICLOROMETHANE
  • AEROTHENE
  • PLASTISOLVE
  • METHYLEN CHLORIDE TECH GRADE
  • METHYLENE CHLORID
  • METHYLEN CHLORIDE
  • Dichloromethane, ECD Tested, For Pesticide analysis
  • Dichloromethane, Stabilized
  • Dichloromethane, Stabilized with Amylene
  • Dichloromethane, Anhydrous, SC
  • Dichloromethane, 99.9%
  • MethylDichloride
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