Process for the displacement to the gaseous phase of the excess

Details Process for the displacement to the gaseous phase of the excess Process for the displacement to the gaseous phase of the excess

1984-12-26

1986-09-23

Warren, Charles F.

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

Organic compounds

Amino nitrogen containing

564 66, 564 70, 564 71, 564 73, C07C12602, C07C12608

Patent

active

046136975

ABSTRACT:
A process for the displacement to the gaseous phase, at 80-250 Kg/cm.sup.2, of the excess NH.sub.3 contained in an aqueous urea solution, coming, at 150.degree.-230.degree. C., from a former stripping, isobaric with the urea synthesis, and containing also CO.sub.2 as ammonium carbamate. The CO.sub.2 is, at most, 25% b.w. of the urea, and the displacement is performed by means of a CO.sub.2 stripping within a falling-film exchanger, hereinafter called the CO.sub.2 stripper, isobaric too with said synthesis. The amount of carbamate leaving the bottom of said CO.sub.2 stripper is substantially equal to the amount of carbamate entering the same stripper. The global NH.sub.3 :CO.sub.2 ratio, in the solution entering the CO.sub.2 stripper, is from 2 to 8 b.w. and heat is supplied only to the uppermost portion of the pipes of the CO.sub.2 stripper, wherein the surface ratio between the lowermost portion and said uppermost portion is at least 1:1 and wherein the residence time ratio between said lowermost portion and said uppermost portion is at least 1/1, the residence time in said uppermost portion being from 1 to 3 s.

REFERENCES:
patent: 3232984 (1961-11-01), Finneran
Hydrocarbon Processing-Nov. 1982, pp. 87-91, Pagani.
Patents Act 1952-1955-Sep. 1, 1960, Chemical Construction Corporation.

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