Process for preparing chloromethyl methyl ether

Details Process for preparing chloromethyl methyl ether Process for preparing chloromethyl methyl ether

C - Chemistry, Metallurgy

07

C

260/648.1

C07C 41/01 (2006.01) C07C 43/12 (2006.01)

Patent

CA 1038888

ABSTRACT An improved process has been developed for preparing chloromethyl methyl ether containing low concentrations of bis(chloromethyl)ether. Methanol and/or methylal is pretreated with HCl under essentially anhydrous conditions. Then about 0.6-1.0 equivalent of formaldehyde per equivalent of methanol is added at a controlled rate and a temperature below 45°C. together with sufficient anhydrous HCl to establish and maintain an essentially HCl-saturated reaction mixture. The resulting chloromethyl methyl ether con- taining a reduced amount of bis(chloromethyl)ether is recovered for use as an intermediate for preparing aromatic chloromethylated compounds.

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