Process and apparatus for concentrating a solution
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United States of America Patent
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-
Jan 1, 1991
Grant Date -
N/A
app pub date -
Sep 21, 1989
filing date -
Oct 12, 1988
priority date (Note) -
Expired
status (Latency Note)
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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 Vapor is withdrawn from that falling-film evaporator which is the first to be supplied with the solution and at least part of said vapor is directly contacted with the solution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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