PROCESS FOR PREPARING CRYSTALLINE CARBAMIDE Russian patent published in 1995 - IPC

Abstract RU 2041202 C1

FIELD: preparation of carbamide. SUBSTANCE: a concentrated aqueous carbamide solution from the stage of separation of carbamide synthesis products based on carbon dioxide and ammonia is crystallized to the super saturation temperature and the gas, pre ferably carbon dioxide, which is inert to carbamide is simultaneously bubbled. The whole of the supersaturated solution is crystallized and carbamide crystals are removed by filtration. According to another process embodiment, carbamide crystals are removed by filtration and the crystals are squeezed out till a compact mass is formed which is then dried. EFFECT: more efficient preparation process. 3 cl, 1 dwg

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RU 2 041 202 C1

Authors

Rakhlin M.Ja.

Bukovskij V.E.

Korchaka N.I.

Gritsyv R.G.

Andreev A.A.

Dates

1995-08-09—Published

1992-12-09—Filed