Patent ID: 7291250
Filing Date: 2007-11-06
Classification: B01D,Y10S

Abstract:
1. A vacuum distillation plant for concentrating a solution, comprising: a) an evaporator for producing an overhead product and a bottoms product; b) vapor concentration means downstream of said evaporator to receive said overhead product; c) a multi-stage condenser downstream of said vapor concentration means to condense at least a portion of said overhead product into a liquid condensate; d) rectification means between said condenser stages; and e) means for maintaining a substantially constant ratio of more volatile to less volatile constituents in the solution undergoing concentration, said means for maintaining the ratio comprising a recycling line connected between the multi-stage condenser and a pump installed in said recycling line for recycling at least part of said condensate from the condenser to said bottoms product of said evaporator.