Manufacture of symmetrical dialkylureas

Details Manufacture of symmetrical dialkylureas Manufacture of symmetrical dialkylureas

1978-08-02

1979-12-11

Waltz, Thomas A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C12715

Patent

active

041783093

ABSTRACT:
A process for the manufacture of symmetrical dialkylureas by reacting monoalkylamines with CO.sub.2 at an elevated temperature and under superatmospheric pressure, in which the unconverted starting materials, water and the by-products formed in the reaction zone, as well as alkylamine alkylcarbamate, after thermal decomposition into monoalkylamine, CO.sub.2 and water, are separated from the dialkylurea formed, and thereafter a part of the unconverted starting materials plus by-products, with or without water, may or may not be recycled to the reaction zone, before isolating an aqueous solution, containing monoalkylamines, CO.sub.2 and other by-products, which solution is treated with alkali metal hydroxide solution in a column, the monoalkylamine, after separation from carbon dioxide and water, being recycled to the reaction zone. The dialkylureas obtained contain not more than 1% of monoalkylurea and 1% of trialkylurea, and may be used as starting materials for various syntheses.

REFERENCES:
Oriental Ind., CA 51:7671e (1956).
Etsuro et al., CA 52:18222cd (1958).
Michelitsch et al., CA 79:146024p (1973).

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