Azeotrope-like compositions of difluoromethane and chlorine

Details Azeotrope-like compositions of difluoromethane and chlorine Azeotrope-like compositions of difluoromethane and chlorine

1998-03-23

2000-08-08

Manoharan, Virginia

Distillation: processes, separatory

With measuring, testing or inspecting

Of concentration

203 29, 203 67, 510408, 570166, 570178, B01D 336, B01D 342, C07C 17386, C07C 1903

Patent

active

060996943

ABSTRACT:
The invention relates to an improvement in a process in which chlorine and difluoromethane are present in a distillation column, for example, a fluorination reaction. By controlling the chlorine feed such that the concentration of chlorine relative to difluoromethane in the distillation column is maintained below about 22 weight percent (the flammability threshold for chlorine in a mixture of difluoromethane and chlorine), formation of a flammable difluoromethane/chlorine mixture may be minimized or avoided. The invention is particularly useful in a process for the preparation of difluoromethane wherein at least one distillation column separates difluoromethane from unreacted starting materials such as methylene chloride, hydrogen fluoride and monochloromonofluoromethane.

REFERENCES:
patent: 3694362 (1972-09-01), Floria
patent: 5210342 (1993-05-01), Moore
patent: 5495057 (1996-02-01), Nam et al.
CA 121:136839: Vinogradov et al., Ah. Prikl. Kim., "Study of Azeotropic Properties in Systems formed by Khladon 21 and Khladon 22 with Chlorine and Hydrogen Fluoride", 1993, 66(10), 2389-92.

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