Removal of iodine or iodide impurities

Details Removal of iodine or iodide impurities Removal of iodine or iodide impurities

1989-09-19

1990-12-04

Manoharan, Virginia

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203DIG6, 560248, 562608, B01D 334

Patent

active

049751557

ABSTRACT:
A process for removing iodine or soluble iodide impurities from a carboxylic acid or carboxylic acid anhydride, the carboxylic acid or carboxylic acid anhydride having been by a carbonylation process. The process includes: step (a) treating impure carboxylic acid or carboxylic acid anhydride containing iodine or soluble iodide impurities with an unsupported scavenger at a temperature of between 20.degree. and 250.degree. C. and step (b) thereafter separating the treated carboxylic acid or carboxylic acid anhydride from the scavenger. The scavenger is a silver salt in the absence of a trialkyl phosphine, a triaryl phosphine and a heterocyclic aromatic nitrogen compound. The preferred scavenger for acetic acid and acetic anhydride is silver acetate.

REFERENCES:
patent: 3658467 (1972-04-01), Maeck
patent: 3772156 (1973-11-01), Johnson et al.
patent: 4615806 (1986-10-01), Hilton
patent: 4664753 (1987-05-01), Erpenbach et al.

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