Process for grade acrylic acid

Distillation: processes – separatory – With chemical reaction – Including step of adding catalyst or reacting material

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203 71, 203DIG21, 562600, B01D 334

Patent

active

055713866

ABSTRACT:
The invention provides a continuous process for producing a pure grade of acrylic acid having residual aldehyde levels under 10 parts per million. The process applies two groups of amines sequentially and continuously in selectively reducing acrolein and furfural and may be advantageously conducted in the presence of maleic acid and maleic anhydride impurities.

REFERENCES:
patent: 3674651 (1972-07-01), Otsuki et al.
patent: 3725208 (1973-04-01), Maezawa et al.
patent: 3893895 (1975-07-01), Dehnert et al.
patent: 4828652 (1989-05-01), Schropp
patent: 5208370 (1993-05-01), Bauer, Jr. et al.
CA 81: 121364.
CA: 80: 96566.
CA 80: 70336.
European Search Report dated Sep. 29, 1995.
Research Disclosure 167066 dated Feb. 20, 1978.

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