Process for the recovery of heat and chemicals from spent liquor
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United States of America Patent
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Jul 27, 1993
Grant Date -
N/A
app pub date -
Aug 31, 1990
filing date -
Aug 29, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a process for the recovery of heat and chemicals from a mixture of ashes and spent liquor by carrying out the final concentrating (2) of the liquor, and its feeding (8) into the soda recovery unit (5), under pressure and at a temperature higher than the atmospheric boiling point of the liquor. According to the invention, the ashes (1) are not mixed with the waste liquor (7) until after the final concentrating (2) of the liquor, and the mixture is further expansion evaporated (4) before the thus concentrated pressurized liquor is fed into the soda recovery unit (5).
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