Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Patent
1987-01-23
1989-09-12
Higel, Floyd D.
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
564 70, 564 71, C07C12602, C07C12608
Patent
active
048662070
ABSTRACT:
An improved process and apparatus for the concentration of an aqueous urea solution by evaporation of water in a single pass shell and tube heat exchanger having a substantially vertical tube bundle within the shell. The aqueous urea solution is introduced into the top of the vertical tube bundle and caused to fall as a film down the inside of said tubes whereby it is heated and water evaporated therefrom to form a concentrated urea solution. The heat for this evaporation is provided by condensing at least a part of a gas mixture containing NH.sub.3, CO.sub.2 and H.sub.2 O in the shell side of the heat exchanger. This gas mixture is introduced into a lower portion of the shell wherein it is caused to flow upwardly in shell in contact with said tube bundle, counter-current to the flow of the aqueous urea solution within the tubes whereby heat from said condensation is transferred to said aqueous urea solution flowing down the inside of the tubes. The shell side is provided with baffle means adapted to permit the gas mixture and condensate to flow upwardly in the shell side in contact with the tubes, while substantially preventing the back flow of either the gas mixture or the condensate within the shell side.
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Burks Henk C.
Jonckers Kees
Higel Floyd D.
Stamicarbon B.V.
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