Process of selective desulfonation

Details Process of selective desulfonation Process of selective desulfonation

1995-07-19

1998-04-21

Cintins, Marianne M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C07C 3700, C07C 3704

Patent

active

057419540

ABSTRACT:
This invention relates to a process for the preparation of m-alkylphenols, particularly of 3-ethylphenol, from the mixture of alkylbenzenesulfonic acid isomers by selective desulfonation, removal of formed alkylbenzene and caustic fusion. In the present invention the inventive desulfonation is accomplished by addition of steam to the mixture of sulfonic acid in an excess in relation to the amount of evaporable water, simultaneously maintaining the temperature of the mixture above 160.degree. C. until the desired purity of isomers is obtained, and until the content of the sulfuric acid in the mixture is decreased below 40%.

REFERENCES:
patent: 4475002 (1984-10-01), Wada et al.

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