B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
202/113, 202/84
B01D 3/00 (2006.01)
Patent
CA 1138811
ABSTRACT OF THE DISCLOSURE The present invention provides a method for distilling liquids in at least two consecutively disposed distillation units which operate at different respective temperature levels, and where- in at least one of said units includes at least two consecutive distillation stages, each stage including an evaporator and as- sociated condenser, an evaporator in one stage adapted to operate at a prevailing pressure which is lower than the prevailing pressure in the preceding stage in the direction of flow of distilling liquid through the evaporators thereof, comprising the steps of: passing the distilling liquid through evaporators of a distillation unit of the multi-stage type wherein in each of said stages the distil- ling liquid is evaporated and the vapor formed condensed to pro- duce distillate in indirect heat exchange with flowing liquid from the succeeding distilling unit operating at a lower temper- ature level, and conducting the distilling liquid in said suc- ceeding unit from the evaporator in a preceding stage to the eva- porator in the next distilling stage where the prevailing pres- sure is lower than the pressure in the preceding distilling stage whereby the distilling liquid flowing through the evaporators of the succeeding unit is cooled as it flows from the preceding dis- tilling stage to the next distilling stage; conducting the cooled distilling liquid from the succeeding unit into the condensers of a preceding distillation unit which is operating at a higher temperature level than that of the succeeding unit wherein the cooled distilling liquid acts as a coolant for distilling liquid which is being passed through the evaporators of the preceding unit wherein it is evaporated with the formed vapor condensed to become distillate in indirect heat exchange with the cooled distilling liquid from the succeeding unit which is operating at a lower temperature level whereby the cooled distilling liquid is from a preceding distilling stage to a next distilling stage there- of; and conducting the heated cooling fluid back to the suc- ceding distillation unit operating at a lower temperature level and into the evaporators thereof. The method and apparatus for use with said method is suitable for distillation methods gener- ally used nowadays especially for distilling sea water of the so called vertical tube multi effect evaporation (VTE) and multi stage flash distillation (MSF).
323470
Marks & Clerk
Saari Risto
LandOfFree
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