| 摘要 |
Tear gas or CS (o-Chlorobenzalmalononitrile) has two nitrile functional groups 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 DEG C., producing ammonium sulfate and orth-ochlorocinnamic acid (the intermediate product). This intermediate product is separated and thermally decarboxylated at 270 DEG C. (with a catalytic amount of soda lime and copper powder) to ortho-chlorostyrene.
|
