Process for drying water-wet methyl chloride

Details Process for drying water-wet methyl chloride Process for drying water-wet methyl chloride

1974-07-08

1979-03-20

Sever, Frank

Distillation: processes, separatory

Distilling to separate or remove only water

From organic compound

203 34, 203 50, 260654S, 260657, B01D 336

Patent

active

041452607

ABSTRACT:
A process for recovering substantially dry methyl chloride from a stream of wet methyl chloride by distilling the wet methyl chloride in the presence of at least 10 molar % hydrogen chloride based on the hydrogen chloride, methyl chloride and water being distilled. The distillation is carried out under super atmospheric pressure and a temperature to produce an aqueous hydrochloric acid of less than 36 wt %, and preferably under such super atmospheric pressure and sufficient temperature to produce an azeotropic hydrochloric acid containing a low concentration of hydrogen chloride. Increasing pressures allows increasing temperatures in the bottoms which form azeotropes of lower concentration hydrochloric acid. The resulting overhead of such a distillation, methyl chloride-hydrogen chloride, will contain less than about 400 molar ppm water. When the distillation is carried out in the presence of about 12 to 25 molar % hydrogen chloride, the overhead will contain between about 100 to 400 molar ppm water.

REFERENCES:
patent: 2308170 (1943-01-01), Green et al.
patent: 3499941 (1970-03-01), Givens et al.

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