Method for sulfonation using porous absorber material

Details Method for sulfonation using porous absorber material Method for sulfonation using porous absorber material

1992-03-30

1993-08-03

Dentz, Bernard

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

Organic compounds

Sulfonic acids or salts thereof

525344, 562 33, 562 39, 562 95, 558 41, 558 42, C07B 4502, C07C30306

Patent

active

052330818

ABSTRACT:
A method for preparing a sulfonated compound with minimal or no waste products using a porous inorganic material absorber. The absorber is saturated with a compound to be sulfonated and then contacted with a sulfonating gas mixture to form a sulfonated product. After forming the sulfonated product, excess sulfonating gas is removed by contacting the sulfonated product with warm air. The sulfonated product is then neutralized and the product is removed with water from the inorganic material absorber. The absorber is then dried with hot air so that it may be reused for future sulfonation processes. The process results in preparation of a sulfonated compound having inorganic salts present in an amount less than about 1.0 percent by weight based on total sulfonated product weight. The process results in highly effective sulfonation of a compound with formation of little or no waste materials, particularly waste materials such as solvents and undesirable inorganic salts. Also disclosed is the resulting sulfonated product.

REFERENCES:
patent: 3620684 (1971-11-01), Brooks
patent: 4111438 (1978-09-01), Longfoot
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patent: 4261916 (1981-04-01), Crosby
patent: 4902493 (1990-02-01), Walle et al.
patent: 4915912 (1990-04-01), Walle et al.

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