Method for controlling the ammonia and CO.sub.2 ratios in a urea

Details Method for controlling the ammonia and CO.sub.2 ratios in a urea Method for controlling the ammonia and CO.sub.2 ratios in a urea

1975-05-13

1977-01-04

Vertiz, Oscar R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

23232C, C07C12600

Patent

active

040013200

ABSTRACT:
A process for urea manufacture is described wherein the molar ratio of unreacted NH.sub.3 to CO.sub.2 (including NH.sub.3 and CO.sub.2 in the form of ammonium carbamate) in the carbamate reaction liquid phase is between 2:1 and 3:1, and the same ratio in the liquid phase in the urea autoclave is maintained between 3:1 and 6:1, control of the process being achieved by analysis of the gas phase and maintaining the NH.sub.3 to CO.sub. 2 molar ratio therein between about 1:1 and 6:1, preferably between about 1.5:1 and 3.5:1, in both the carbamate reactor and the urea autoclave.

REFERENCES:
patent: 3026184 (1962-03-01), Karasek
patent: 3304159 (1967-02-01), Hinsvark
patent: 3372189 (1968-03-01), Otsuka et al.

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