Purification process for methyl acetate

Details Purification process for methyl acetate Purification process for methyl acetate

C - Chemistry, Metallurgy

07

C

C07C 51/12 (2006.01) C07C 53/08 (2006.01) C07C 53/12 (2006.01) C07C 67/58 (2006.01) C07C 67/60 (2006.01) C07C 69/14 (2006.01)

Patent

CA 2055551

ABSTRACT Esters such as methyl acetate which contain carbonyl impurities including aldehydes are purified by adding to the esters an amino compound which reacts with the carbonyls to form water soluble nitrogenous derivatives, separating an organic ester phase from an aqueous derivative phase, and distilling the ester phase to further remove heavier impurities. The formation of nitrile from the nitrogenous derivative is minimized by adding water to the distillation column or washing the aqueous bottoms from distillation with water to further remove the derivatives from any ester contained in the bottoms. The organic phase recovered from the bottoms can be recycled to the distillation to recover ester.

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