ChemicalBook CAS DataBase List Dichloromethane

Dichloromethane synthesis

14synthesis methods

Product Name:Dichloromethane
CAS Number:75-09-2
Molecular formula:CH2Cl2
Molecular Weight:84.93

Dichloromethane (DCM) has the advantages of strong dissolving ability and low toxicity, and is widely used in the manufacture of safety film films, polycarbonate, and the rest are used as paint solvent, metal degreaser, aerosol propellant, polyurethane foaming agent, mold release agent, paint remover. The industry generally generates dichloromethane by reacting methyl chloride and chlorine under 4000kW illumination.

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75-09-2
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124-63-0
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Yield:124-63-0 69%

Reaction Conditions:

with sulfur dioxide;chlorine at 25; under 2250.23 Torr; for 1 h;Irradiation;Concentration;Wavelength;

Steps:

7 INVENTIVE EXAMPLE 7 (Illumination power density)

In a flask reactor set up as in Inventive Example 1, a 3x2 W LED lamp (455 nm wavelength) was used. The corresponding power density is 60 W/m². A mixture of the three reactants, having a molar ratio of CH₄:Cl₂:S0₂ = 1:1:6.5, was flowed through the reactor. The space velocity for the reactants was 27 h ¹. The reactor pressure was controlled at 3 bar by connecting the reactor outlet to a back-pressure regulator, and the temperature was kept at 25°C. The LED lamp was turned on for 60 min for continuous reaction to produce MSC. The effluent gas composition was analyzed by GC-FID and GC-TCD. Separately, the liquid products from the reactor collected in a xylene solution was analyzed by gas chromatography. The reaction performance is summarized in the following table.

References:

WO2019/144049,2019,A1 Location in patent:Paragraph 0042-0051