Process and apparatus for concentrating a solution

Details Process and apparatus for concentrating a solution Process and apparatus for concentrating a solution

1989-09-21

1991-01-01

Manoharan, Virginia

Concentrating evaporators

Film type

Moving film

159 172, 159 173, 159 23, 159 431, 159 49, 159901, 159DIG8, 159DIG32, 202174, 202235, 202236, B01D 122, B01D 126

Patent

active

049815555

ABSTRACT:
The solutions are concentrated by multiple-effect evaporation in indirectly heated evaporators. The highest concentration of the solution is reached in a final evaporator stage, which is heated with live steam. The final evaporators stage includes two to four falling-film evaporators, all of which are heated with live steam. The falling-film evaporators are consecutively flown through by the solution. Vapor is withdrawn from that falling-film evaporator which is the first to be supplied with the solution and at least part of said vapor is directly contacted with the solution as it flows down through the heating zone of at least one other evaporator of the final stage. From that falling-film evaporator of the final stage which is the first to be supplied with the solution the vapor may be fed to all other evaporators of the final stage.

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patent: 4366027 (1982-12-01), Lauro
patent: 4533433 (1985-08-01), Petterson
patent: 4687546 (1987-08-01), Willis

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