Process for purifying methacrylamide

Details Process for purifying methacrylamide Process for purifying methacrylamide

1982-01-19

1984-08-14

Hines, Robert V.

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

Organic compounds

Amino nitrogen containing

C07C103133

Patent

active

044658567

ABSTRACT:
In a conventional process for the purification of crude methacrylamide by the recrystallization from an aqueous medium, pH of the aqueous methacrylamide solution is controlled to a value in alkaline range of at least 8 and then methacrylamide is crystallized out. As the alkali used for the pH control, there have been used alkali metal and alkaline earth metal carbonates and hydroxides. Methacrylamide to be recrystallized is crude methacrylamide obtained by neutralizing methacrylamide sulfate obtained from acetone cyanhydrin and sulfuric acid with ammonia in the presence of water.

REFERENCES:
patent: 2683173 (1954-07-01), Weirgerber
patent: 2753375 (1956-07-01), Webb et al.
patent: 2798887 (1957-07-01), Bikales
patent: 2806881 (1957-09-01), Porter, Jr.
patent: 3008990 (1961-11-01), Weiss
patent: 3274245 (1966-09-01), Bobsein et al.
patent: 3947518 (1976-03-01), Ohshima et al.

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