Continuous esterification of methacrylic acid and product recove

Details Continuous esterification of methacrylic acid and product recove Continuous esterification of methacrylic acid and product recove

1986-06-23

1988-03-22

Moyer, Donald B.

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

Organic compounds

Carboxylic acid esters

C07C 6708

Patent

active

047330040

ABSTRACT:
A process for the esterification of an olefinically unsaturated carboxylic acid, such as methacrylic acid, with a lower alkanol, such as methanol, to form the corresponding ester over a solid cationic catalyst in which the carboxylic acid is used in excess of the alkanol on a molar basis, the improvement which comprises: (A) employing a hydraulically fluidized solid catalyst reactor for the continuous esterification reaction, (B) including in the esterification reaction a solvent which is a hydrocarbon having from 6 to 15 carbon atoms, (C) passing the effluent from the esterification reactor into a first distillation column in which the ester product and water by-product are taken overhead, (D) taking the unesterified carboxylic acid, solvent, and heavies from the bottom of the first distillation column, (E) separating the water from the ester in the overhead from (C) and recoverying the ester product, (F) separating heavies from the carboxylic acid-solvent from (D) in a second distillation column, (G) recycling the carboxylic acid-solvent from (F) back to the esterification reactor (A), and (H) disposing of the heavies from (F) is described.

REFERENCES:
patent: 3776947 (1973-12-01), Shimizu et al.
patent: 3882167 (1975-05-01), Lohmar et al.
patent: 4250328 (1981-02-01), Fujita et al.
patent: 4435594 (1984-03-01), Matsumura et al.
Perry, John H., Chemical Engineers' Handbook, 4th Ed. (1963), McGraw Hill, Publ. at pp. 20-50.

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