Cooling aqueous alkali metal hydroxide liquors by vacuum evapora

Details Cooling aqueous alkali metal hydroxide liquors by vacuum evapora Cooling aqueous alkali metal hydroxide liquors by vacuum evapora

1973-05-14

1976-06-15

Lutter, Frank W.

Chemistry: physical processes

Physical processes

Crystallization

159 45, 159 47WL, 202185A, 423183, 423184, 203 91, 23303, B01D 900

Patent

active

039634248

ABSTRACT:
A method and apparatus for cooling aqueous alkali metal hydroxide liquors such as, for example, caustic soda liquors, involving the vacuum cooling of a body of such liquor in an evaporating chamber having a overhead vapor outlet which communicates with a direct-contact barometric condenser supplied with a stream of cooled alkali metal hydroxide liquor. The cooled alkali metal hydroxide liquor has a vapor pressure below the absolute pressure of water vapor evolved from the body of liquor in the evaporating chamber and condenses the water vapor upon contact therewith. A stream of cooled concentrated alkali metal hydroxide liquor withdrawn from the evaporating chamber is, in accordance with a preferred embodiment of the present invention, further cooled and solids contained therein, such as, for example, sodium chloride crystals, are then removed in a suitable liquid-solids separation device. At least a portion of the substantially solids-free liquor from the liquid-solids separation device is then transmitted to the direct-contact barometric condenser for use as the condensing medium.

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The Electrochemical Society Preprint 86-24, Oct. 12-14, 1944, Buff. N.Y., pp. 265-275.

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