Purification process of methacrylamide

Details Purification process of methacrylamide Purification process of methacrylamide

1992-10-14

1994-04-12

Hollrah, Glennon H.

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

Organic compounds

Amino nitrogen containing

C07C23309

Patent

active

053027540

ABSTRACT:
A purification process of crude methacrylamide by recrystallization from an aqueous methacrylamide solution, comprising the steps of conducting crystallization by adjusting the hydrogen ion concentration of the aqueous methacrylamide solution to pH 8 or more, separating a methacrylamide crystal, adjusting 5% by weight or more of resulting mother liquor to pH 5 or less, separating precipitated insoluble matter, and reusing thus-treated mother liquor, is provided.
The high quality methacrylamide crystal thus obtained is excellent in Hazen number, purity and transparency of a methanol solution and suitable for uses such as windshield glasses.

REFERENCES:
patent: 2865960 (1958-12-01), Shearer et al.
patent: 3549706 (1970-12-01), Takaki et al.
patent: 3666809 (1972-05-01), Okuno et al.
patent: 4010142 (1977-03-01), Hurlock et al.
patent: 4345101 (1982-08-01), Asano et al.
patent: 4465856 (1984-08-01), Horiuchi et al.

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