Process for the manufacture of isobutyric anhydride

Details Process for the manufacture of isobutyric anhydride Process for the manufacture of isobutyric anhydride

2006-05-23

2006-05-23

Richter, Johann (Department: 1621)

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

Organic compounds

Carboxylic acid anhydrides

C562S888000

Reexamination Certificate

active

07049467

ABSTRACT:
This process for the manufacture of isobutyric anhydride by reacting acetic anhydride with isobutyric acid, distilling the acetic acid generated as it is formed, is characterized in that the reactor is initially loaded with at least a portion of one of the reagents and a portion of the other such that the reagents are in an excess molar ratio relative to the stoichiometry of one of the reagents, and the reaction is carried out while adding the remainder of the reagents as the reaction progresses and according to the place left free in the reactor by the distillation of the acetic acid produced by the reaction, until the desired overall molar ratio of the reagents is reached.

REFERENCES:
patent: 4857239 (1989-08-01), Hurtel et al.
patent: 0 004 641 (1979-10-01), None
patent: 0004641 (1979-10-01), None
patent: 784 458 (1935-07-01), None
patent: 2 514 345 (1983-04-01), None

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