Catalyst for and method of preparing cellulose esters

Details Catalyst for and method of preparing cellulose esters Catalyst for and method of preparing cellulose esters

1980-08-29

1982-05-11

Clingman, A. Lionel

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

Organic compounds

Carbohydrates or derivatives

252426, 252428, 536 63, C08B 306

Patent

active

043294472

ABSTRACT:
Disclosed is a catalyst and a method of preparing lower fatty acid esters of cellulose which comprises esterifying at a temperature of between about 75.degree. C. and about 110.degree. C. a cellulose compound having esterifiable hydroxyl groups with an esterifying bath comprising an organic acid anhydride, a diluent, and a catalyst comprising (a) from about 0.3 to about 3.0% by weight, based on the weight of cellulose, of an acid selected from the group consisting of sulfuric acid, p-toluene sulfonic acid, methane sulfonic acid, methane disulfonic acid and m-benzene disulfonic acid, and (b) from about 0.05 to about 0.3% by weight, based on the weight of cellulose, of a dialkyl phosphite, the alkyl groups of which contain from 2 to 4 carbon atoms, the weight ratio of said bath to the cellulose being between about 5:1 and about 10:1.

REFERENCES:
patent: 2827455 (1958-03-01), Wells et al.
patent: 2861069 (1958-11-01), Touey et al.
patent: 3976595 (1976-08-01), Scott et al.

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