Process for working up aqueous solutions of sodium methallyl...

Details Process for working up aqueous solutions of sodium methallyl... Process for working up aqueous solutions of sodium methallyl...

C - Chemistry, Metallurgy

07

C

260/530.6

C07C 139/14 (1985.01) C07C 143/16 (1985.01)

Patent

CA 1229347

ABSTRACT For the processing of aqueous solutions of sodium methallyl sulfonate with about equimolar NaCl content, the solutions are evaporated, at a pH range of 7.5 - 10.5,?inia temperature range from 75° to 110° C prefer ably using two temperature stages, e.g. 90 and 110° by using different pressure, to closely just below the solubility limit of methallyl sulfonate so that only NaCl is crystallized. After separation of the crystallized NaCl product, the hot filtrate is cooled, thus obtaining only sodium methallyl sulfonate as the crystallized product, which is then separated. The resultant mother liquor is recycled into the evaporation process, optionally purging up to 10% of the mother liquor.

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