Process for the modernization of existing urea plants and a mode

Details Process for the modernization of existing urea plants and a mode Process for the modernization of existing urea plants and a mode

1990-12-27

1993-01-05

Manoharan, Virginia

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

159 472, 203 49, 203 73, 203 80, 564 68, 564 71, 564 72, 564 73, B01D 300, C07C27316

Patent

active

051768003

ABSTRACT:
A process to modernize existing urea plants which use a stripping with carbon dioxide, and to increase urea yields and flexibility under overload conditions while at the same time reducing energy consumption, corrosion phenomena and possible risks of explosive mixtures. The plant includes: a passivation stage with the introduction of an oxidizing agent and reduction of the air fed to the system; a medium pressure distillation stage of the products leaving the stripping section, and a condensation of the products of the distillation, effected in a pre-evaporation phase to concentrate at low pressure the urea solution.
The modernized plant, includes at the start at least a reactor, a scrubber, a condenser, a stripper and the evaporators, includes also a passivation section, a medium pressure distillation section, and a distillation section with double-effect technique.

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European Chemical News; Jan. 17, 1969 ("Urea Supplement") pp. 17, 19, 20.
Belgian Patent 625397, Belgian Report Dec. 1963.

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