Process for selective removal of cyclic urea from hindered amine

Details Process for selective removal of cyclic urea from hindered amine Process for selective removal of cyclic urea from hindered amine

1978-12-22

1979-12-25

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423228, 423232, 423234, 423236, 423243, 2602393R, 544314, 548317, B01D 5334

Patent

active

041805488

ABSTRACT:
A cyclic urea reaction product forms as a by-product of a hindered amine acid gas scrubbing process and results in an ultimate buildup of the material in the circulating amine scrubbing solution. The buildup of this material has a deleterious effect on acid gas removal rates and accordingly, results in inefficient acid gas removal. In the process of the present invention, the cyclic urea degradation product is removed from the circulating solution by employing a selective precipitation of the cyclic urea followed by filtration. The selective precipitation is carried out by cooling the circulating solution to a particular temperature level such that the cyclic urea comes out of solution while the other components remain in solution.

REFERENCES:
patent: 2497309 (1950-02-01), Larson et al.
patent: 2615025 (1952-10-01), Lutz
patent: 2874149 (1959-02-01), Applegarth et al.
patent: 4112050 (1978-09-01), Sartori et al.
patent: 4112051 (1978-09-01), Sartori et al.
patent: 4112052 (1978-09-01), Sartori et al.

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