Process for purifying hydrogen chloride gas

Details Process for purifying hydrogen chloride gas Process for purifying hydrogen chloride gas

1986-07-14

1987-07-07

Hart, Charles

Gas separation

Means within gas stream for conducting concentrate to collector

423488, 423240, B01D 5314

Patent

active

046784829

ABSTRACT:
Hydrogen chloride gas obtained as a by-product in the production of chloroacetic acid by subjecting acetic acid to a catalytic chlorination reaction with chlorine gas in the presence of acetic anhydride and/or acetyl chloride is purified. The prepurified by-product still contains 0.1-3 vol % acetyl chloride and up to 0.1 vol % chloroacetyl chloride. For purification, the hydrogen chloride gas is passed through two zones series-connected together and scrubbed in countercurrent fashion. More particularly, it is scrubbed in the first zone with concentrated hydrochloric acid and in the second zone with concentrated sulfuric acid.

REFERENCES:
patent: 4003723 (1977-01-01), Schafer et al.

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