Isolation of liquid urea from the off-gas of the synthesis of me

Details Isolation of liquid urea from the off-gas of the synthesis of me Isolation of liquid urea from the off-gas of the synthesis of me

1984-01-05

1986-10-07

Hines, Robert V.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564 67, 544203, C07C12608

Patent

active

046160949

ABSTRACT:
A process for isolating liquid urea and its thermal decomposition products from the off-gas of melamine synthesis, which gas has been freed from melamine by fractional condensation and then been washed with molten urea, wherein the off-gas, containing 2-10 kg of melt per kg of pure gas, is passed at 8-30 m/sec tangentially into the upper part of an axially symmetrical separation zone. As a result of the rotation imparted to the gas/liquid mixture, the two phases are separated from one another, and both pass downward through the separation zone. The gas and liquid are separately taken off at the bottom end of the separation zone. The residence time of the gas mixture in the separation zone is not less than 0.5 second.

REFERENCES:
patent: 3979392 (1976-09-01), Eguchi et al.

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