Process for concentrating aqueous urea solutions

Details Process for concentrating aqueous urea solutions Process for concentrating aqueous urea solutions

1980-09-11

1982-02-23

Yudkoff, Norman

Concentrating evaporators

Processes

Involving waste liquid

159 49, 159 16R, 159 13A, 564 73, B01D 122

Patent

active

043167675

ABSTRACT:
Disclosed is a process for concentrating aqueous urea solutions in which an aqueous urea solution is allowed to flow as a falling film in countercurrent contact with a stream of hot inert gas to concentrate it to 95-99% by weight and the aqueous urea solution so concentrated is then passed through a packed zone in cocurrent contact with a stream of hot inert gas to concentrate it to not less than 99.5% by weight.

REFERENCES:
patent: 2367695 (1945-01-01), Spiselman
patent: 2933527 (1960-04-01), Guyer et al.
patent: 3147174 (1964-09-01), Cook
patent: 3405689 (1968-10-01), Peterson
patent: 3491821 (1970-01-01), Graumann et al.
patent: 3822192 (1974-07-01), Brown

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