Process for preparing and recovering acrylic acid

Details Process for preparing and recovering acrylic acid Process for preparing and recovering acrylic acid

1979-01-15

1982-03-02

Garner, Vivian

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

Organic compounds

Carboxylic acids and salts thereof

203 8, 203 28, 203 60, 203 72, 203 73, 203DIG21, 560185, 560208, 560218, 562536, 562545, 562548, 562598, 562599, 562600, 562608, 568753, C07C 5125, C07C 5150, C07C 5705, C07C 57055

Patent

active

043179266

ABSTRACT:
In a process for producing acrylic acid which comprises contacting with water an acrylic acid-containing reaction product gas which has been obtained by the catalytic vapor phase oxidation of an olefinic compound of a general formula, CH.sub.2 .dbd.CHX, wherein X represents at least one group selected from the group consisting of CH.sub.3 and CHO, with a molecular oxygen-containing gas thereby collecting the acrylic acid in the form of an aqueous solution, separating the acrylic acid from the aqueous solution, and refining the thus separated acrylic acid, the improvement comprising a step of subjecting the bottom liquor of a rectification tower for acrylic acid to a decomposition evaporation and a step of subjecting the evaporation residue having a composition of 1-25 wt % of acrylic acid, 9-49 wt % of acrylic acid dimer, wherein total amount of the acrylic acid and its dimer is in the range of 10-50 wt %, and correspondingly 90-50 wt % of other matters to an extraction with water to separate the acrylic acid, its dimer and hydroquinone by the extraction.

REFERENCES:
patent: 2941007 (1960-06-01), Callahan
patent: 3926744 (1975-12-01), Noll et al.
patent: 4124634 (1978-11-01), Gotoh et al.

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