Process for purifying crude hydrochloric acid

Details Process for purifying crude hydrochloric acid Process for purifying crude hydrochloric acid

1991-01-25

1992-12-29

Bascomb, Jr., Wilbur

Distillation: processes, separatory

Distilling to separate or remove only water

203 22, 203 25, 203 42, 203 80, 55 71, 159 201, 159DIG16, 159DIG19, 202174, 423240R, 423488, B01D 126, C01B 707

Patent

active

051748657

ABSTRACT:
Aqueous hydrochloric acid of very high purity can be obtained in a process for purifying crude aqueous 5 to 20 wt. % hydrochloric acid. In the purification, process water or a water/HCl mixture is evaporated from the crude aqueous hydrochloric acid at a pressure of from 0.01 to 1.0 bar and a temperature of from 10.degree. to 100.degree. C. until a crude, azeotropic mixture of water and HCl is obtained. The crude, azeotropic mixture of water and HCl is distilled in a distillation apparatus at a pressure of from 0.1 to 1.5 bar and a temperature of from 50.degree. to 110.degree. C. A purified gaseous, azeotropic mixture of water and HCl is recovered from the head of the distillation apparatus and a liquid mixture is left at the bottom of the distillation apparatus. The liquid mixture which is left at the bottom of the distillation apparatus is distilled at a pressure of from 0.5 to 2.5 bar and a temperature of from 80.degree. to 130.degree. C.

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