Purification and preparation processes for methyl methacrylate

Details Purification and preparation processes for methyl methacrylate Purification and preparation processes for methyl methacrylate

C - Chemistry, Metallurgy

07

C

202/58, 260/482.

C07C 29/82 (2006.01) B01D 3/36 (2006.01) C07C 31/04 (2006.01) C07C 67/08 (2006.01) C07C 67/54 (2006.01) C07C 69/54 (2006.01)

Patent

CA 2012935

ABSTRACT A purification process for methyl methacrylate (MMA) and a recovery process for methanol are disclosed. A mix- ture, which contains water, methanol and methyl methacry- late (MMA) as principal components along with at least one of methyl acrylate, methyl propionate and methacrylic acid, is azeotropically distilled together with hexane to obtain MMA in a form substantially free of water, methanol methyl acrylate, methy1 propionate and hexane and a low boiling-point fraction. The low boiling-point frac- tion is cooled and separated into a water phase and an oil phase. Methanol can be recovered from the water phase by adding an alkaline substance to it and then distilling the resultant mixture. A preparation process of MMA is also disclosed. MMA can be prepared by esterifying methacrylic acid or methacylamide with methanol and then applying the above purification process.

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