Purification and preparation processes for methyl methacrylate

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

1990-03-30

1991-07-02

Bascomb, Wilbur

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

Organic compounds

Carboxylic acid esters

203 37, 203 70, 203 74, 203 76, 203 81, 203 83, 203DIG21, 568916, B01D 336, C07C 6754

Patent

active

050287354

ABSTRACT:
A purification process for methyl methacrylate (MMA) and a recovery process for methanol are disclosed. A mixture, which contains water, methanol and methyl methacrylate (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, methyl propionate and hexane and a low boiling-point fraction. The low boiling-point fraction 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 methacrylamide with methanol and then applying the above purification process.

REFERENCES:
patent: 2406561 (1946-08-01), Rehberg
patent: 2614072 (1952-10-01), Carlson et al.
patent: 3960672 (1976-06-01), Ester et al.
patent: 3990952 (1976-11-01), Katzen et al.
patent: 4518462 (1985-05-01), Aoshima et al.
patent: 4791221 (1988-12-01), Gabillet

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