Recovery of methacrylic acid from the effluent obtained from the

Details Recovery of methacrylic acid from the effluent obtained from the Recovery of methacrylic acid from the effluent obtained from the

1975-09-02

1977-08-09

Bernstein, Hiram H.

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

203 70, 203 77, 203 91, 260526N, B01D 334, C07C 5704

Patent

active

040409139

ABSTRACT:
A process for the recovery of methacrylic acid from an aqueous effluent obtained by the vapor phase condensation of formaldehyde and propionic acid, where the effluent further contains unreacted formaldehyde and unreacted propionic acid, and where the recovery steps include: extracting the effluent with an organic solvent capable of azeotroping with propionic acid to obtain an organic phase and an aqueous raffinate; distilling the organic phase to remove 50-100% of the unreacted propionic acid and leaving as bottoms remaining unreacted propionic acid and methacrylic acid; distilling the methacrylic/propionic acid bottoms to obtain remaining unreacted propionic acid overhead and pure methacrylic acid as bottoms; distilling the aqueous raffinate with an entrainer to obtain dilute aqueous formaldehyde overhead and about 50% aqueous formaldehyde as bottoms; and distilling the dilute aqueous formaldehyde taken overhead to concentrate it to about 35% aqueous concentration.

REFERENCES:
patent: 2475959 (1949-07-01), Hasche
patent: 3247248 (1966-04-01), Sims
patent: 3414485 (1968-12-01), Speed
patent: 3433831 (1969-03-01), Yomiyama
patent: 3781332 (1973-12-01), Sato
patent: 3798264 (1974-03-01), Kubota
patent: 3844903 (1974-10-01), Willersinn

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