Process for producing sebacic acid

Details Process for producing sebacic acid Process for producing sebacic acid

C - Chemistry, Metallurgy

25

B

204/53

C25B 3/10 (2006.01) C07C 51/09 (2006.01) C07C 55/20 (2006.01)

Patent

CA 1145293

ABSTRACT OF THE DISCLOSURE In a process for producing sebacic acid from adipic acid comprising three steps, i.e. (1) half- esterification of adipic acid with methanol to yield monomethyl adipate, (2) electrolytic condensation of the monomethyl adipate to yield dimethyl sebacate, followed by separation and purification of the dimethyl sebacate and (3) hydrolysis of dimethyl sebacate to yield sebacic acid, the desired sebacic acid can be produced with easy recovery of an alkali metal salt of monomethyl adipate and easy separation of the dimethyl sebacate by removing the methanol from the electrolytic solution containing dimethyl sebacate after the electrolytic condensation after or at the same time that water is added to the electrolytic solution, separating the residual solution into oily and aqueous layers, obtaining dimethyl sebacate from the oil layer, recovering the alkali metal salt of monomethyl adipate as a monomethyl adipate solution from the aqueous layer with addition of monomethyl adipate to the aqueous layer before or after removal of water by evaporation from the aqueous layer, and recycling the monomethyl adipate solution to the electrolytic condensation step.

351436

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