Purification of crude hydrogen chloride

Details Purification of crude hydrogen chloride Purification of crude hydrogen chloride

1976-05-17

1977-01-18

Nozick, Bernard

Gas separation

Means within gas stream for conducting concentrate to collector

260539A, 423240, 423488, B01D 1900

Patent

active

040037231

ABSTRACT:
Crude hydrogen chloride gas obtained as a by-product in the production of chloroacetic acids by the catalytic chlorination of acetic acid with chlorine gas in contact with acetic anhydride and/or acetyl chloride, and contaminated with about 0.6 up to 3 % by volume of acetyl chloride is purified. To this end, crude hydrogen chloride gas is introduced into the base portion of a scrubbing zone and scrubbed countercurrently therein with 0.5 up to 20 liter, per normal cubic meter (S.T.P) of hydrogen chloride gas, of a cooled scrubbing liquid under circulation, consisting substantially of 20-80 weight % of concentrated H.sub.2 SO.sub.4, 15-60 weight % of acetic acid, and 5-50 weight % of water. The resulting purified moist hydrogen chloride gas issuing at the head of the scrubbing zone is introduced into the base portion of a drying zone and scrubbed countercurrently with precooled sulfuric acid under circulation.

REFERENCES:
patent: 2558011 (1951-06-01), Sprauer et al.

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