Synthesis of chloroacetic acids
AssigneeElf Atochem S.A.
InventorsYves Correia, Daniel Pellegrin
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Abstract
Chloroacetic acids and essentially pure hydrochloric acid are prepared by chlorinating acetic acid in the presence of a catalytically effective amount of acetic anhydride, acetyl chloride, or admixture thereof, whereby byproducing a gaseous stream of crude hydrochloric acid, contacting such gaseous stream with active charcoal to remove the chlorine values therefrom, separating (i) pure hydrochloric acid and (ii) remaining products from the gaseous stream thus purified, and recycling such remaining products (ii) to the medium of chlorination.
Claims16
A process for the preparation of chloroacetic acids, comprising chlorinating acetic acid in the presence of a catalytically effective amount of acetic anhydride, acetyl chloride, or admixture thereof, whereby a gaseous byproduct stream including hydrochloric acid and chlorine is produced, wherein the process further comprises (a) contacting said gaseous byproduct stream with active charcoal to remove chlorine values therefrom, (b) separating (i) pure hydrochloric acid and (ii) remaining products from the gaseous stream, and then (c) recycling said remaining products (ii) to the medium of chlorination.
In a process for the preparation of chloroacetic acid comprising the chlorination of acetic acid and in which a gaseous byproduct stream including hydrochloric acid and chlorine is produced, wherein the improvement comprises (a) contacting the gaseous byproduct stream with active charcoal to remove chlorine therefrom, (b) separating (i) hydrochloric acid and (ii) remaining products from the gaseous stream, and then (c) recycling the remaining products (ii) to the medium of chlorination.
Dependencies are inferred from the claim text.