Distillation: processes – separatory – And recovering heat by indirect heat exchange – Utilizing recovered heat for heating the distillation zone
Patent
1984-08-13
1986-06-10
Bashore, S. Leon
Distillation: processes, separatory
And recovering heat by indirect heat exchange
Utilizing recovered heat for heating the distillation zone
203 11, 203 24, 203 27, 203 37, 203 79, 203 80, 203 92, 423357, B01D 338
Patent
active
045941319
ABSTRACT:
A water purification process is described for the removal of ammonia and optionally one or more acid gases from wastewaters such as coke-plant or coal conversion wastewaters. The process involves adding alkali to these wastewaters in amounts sufficient to react with fixed ammonia salts present in the wastewater and to enable substantial amounts of the ammonia to be evolved upon distillation, and subjecting the thus treated wastewater to distillation to remove substantial amounts of the ammonia and acid gases present from the wastewater. This process is achieved by two separate and successive distillations. In this process, the vapor streams being withdrawn from the first and/or second distillations are subjected to an impurity removal process to thereby produce a vapor stream substantially reduced in impurities, and useful as a stripping vapor in this process, and then reusing this vapor stream as a stripping vapor in the process. The impurity removal process may include (1) passing a vapor stream through an ammonia absorbing solution, or (2) a sequence of steps involving compression, condensation, steam stripping and vaporization.
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Bashore S. Leon
Krayer William L.
Manoharan V.
United States Steel Corporation
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