Process for recovering ammonium sulphate from aqueous solutions

Details Process for recovering ammonium sulphate from aqueous solutions Process for recovering ammonium sulphate from aqueous solutions

1971-07-12

1977-04-05

Emery, Stephen J.

Chemistry: physical processes

Physical processes

Crystallization

23302A, 423549, 2604653, 2604659, 260486NC, B01D 902, C01C 124

Patent

active

040159469

ABSTRACT:
A process for recovering ammonium sulphate from an aqueous ammonium sulphate solution containing organic contaminants is disclosed. The aqueous solution is contacted with an organic substance which is water soluble and which is capable, in combination with a saturated ammonium sulphate solution, of forming a two-layer system. The organic substance is selected from the group consisting of lactames of 4 to 20 carbon atoms, and mixtures thereof. The resultant two layers may be separated into an aqueous phase containing the ammonium sulphate, and an organic phase containing the organic substance and the organic contaminants. Typical organic contaminants include acrylonitrile prepared from propylene, methyl methacrylate prepared from acetone cyandihydrin, and methyl methacrylate prepared from acrylonitrile. The ammonium sulphate is readily crystallized from the aqueous phase. Alternatively, the ammonium sulphate may be directly crystallized from the aqueous solution while the solution is in contact with the organic substance.

REFERENCES:
patent: 2331235 (1943-10-01), Ruys et al.
patent: 3374263 (1968-03-01), Weitz et al.
patent: 3468624 (1969-09-01), Miller et al.
patent: 3489512 (1970-01-01), Okuno et al.
patent: 3607136 (1971-09-01), Smiley

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