Process for the concentration of spent liquors

Details Process for the concentration of spent liquors Process for the concentration of spent liquors

1992-04-15

1995-01-17

Manoharan, Virginia

Concentrating evaporators

Processes

Involving waste liquid

159 21, 159 163, 159 171, 159 242, 159DIG8, 159DIG10, 162 29, 162 46, 162 47, 202174, B01D 126

Patent

active

053823214

ABSTRACT:
A process and apparatus provide for the evaporation of spent liquors in several stages, and recovery of volatile substances from spent liquors of organic solvent pulping processes. The recovery system for volatiles is integrated with the evaporation of spent liquors. Heating condensation is carried out in each evaporator effect on several heat surfaces separated from each other. Pure water, vapor condensate, or steam may be injected to the warmer side of an evaporator effect in order to increase the condensing temperature of the vapor. The volatiles are typically alcohols (methanol and/or ethanol) used as the cooking liquor in organic solvent pulping.

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