Conversion of CS (tear gas) to o-chlorostyrene and ammonium sulfate
AssigneeThe United States of America as represented by the Secretary of the Army
InventorSolim S. W. Kwak
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Abstract
Tear gas or CS (o-Chlorobenzalmalononitrile) has two nitrile functional gps which, when removed, effects the chemical conversion of bulk CS to o-chlorostyrene. This involves a first step, an acid or base catalyzed hydrolysis of CS to o-chlorocinnamic acid. Thereafter a second reaction is the decarboxylation of the intermediate product to give o-chlorostyrene. CS is reacted with 70% sulfuric acid at 120.degree. C., producing ammonium sulfate and orth-ochlorocinnamic acid (the intermediate product). This intermediate product is separated and thermally decarboxylated at 270.degree. C. (with a catalytic amount of soda lime and copper powder) to ortho-chlorostyrene.
Claims7
Method for converting O-Chlorobenzalmalononitrile to O-Chlorostyrene, which comprises subjecting the O-Chlorobenzalmalononitrile to hydrolysis to produce O-Chlorocinnamic acid and subjecting the O-Chlorocinnamic acid to decarboxylation to produce O-Chlorostyrene.
Dependencies are inferred from the claim text.