Process for producing 2,5-dichloro-p-xylene
AssigneeUnion Carbide Corporation
InventorYoung-Jin Lee
Life of this patent
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Abstract
Reaction of ferric chloride with 2-chloro-p-xylene yields dichloro-p-xylene having a high ratio of 2,5-dichloro-p-xylene isomer to 2,3-dichloro-p-xylene isomer.
Claims6
A process for producing dichlorinated p-xylene having a high ratio of 2,5-dichloro-p-xylene to 2,3-dichloro-p-xylene isomers which comprises reacting 2-chloro-p-xylene and anhydrous ferric chloride at a temperature of from 25.degree. C. to 150.degree. C.
A process for producing dichlorinated p-xylene having a high ratio of 2,5-dichloro-p-xylene to 2,3-dichloro-p-xylene isomers which comprises:
- (A) heating p-xylene in contact with chlorine and a chlorination catalyst at a temperature of 25.degree. C. to 130.degree. C. until 10 to 40% of the p-xylene has been converted to 2-chloro-p-xylene;
- (B) separating the 2-chloro-p-xylene from the reaction product;
- and
- (C) reacting the 2-chloro-p-xylene thus obtained with anhydrous ferric chloride at a temperature of from 25.degree. C. to 150.degree. C. to obtain the desired dichlorinated p-xylene.
A process for producing dichlorinated p-xylene having a high ratio of 2,5-dichloro-p-xylene to 2,3-dichloro-p-xylene isomers which comprises reacting 2-chloro-p-xylene and anhydrous ferric chloride at a temperature of from 25.degree. C. to 150.degree. C., wherein said process produces a product having a weight ratio of 2,5-dichloro-p-xylene to 2,3-dichloro-p-xylene of at least about 9:1.
Dependencies are inferred from the claim text.