Process for integrated evaporation and gasification of spent liquor from cellulose cooking
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United States of America Patent
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Feb 9, 1999
Grant Date -
N/A
app pub date -
May 17, 1996
filing date -
Nov 26, 1993
priority date (Note) -
Expired
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Abstract
The invention relates to a process for integrated evaporation and gasification of spent liquor from the production of cellulose, the gasification taking place in a reactor (1) at a pressure of from atmospheric pressure up to about 150 bar and at a temperature of about 500.degree.-1600.degree. C., by partial combustion of the spent liquor, a gas phase and a phase of solid and/or smelted material being formed in the reactor and being removed therefrom. The invention is characterized in that the combustion gas obtained from the reactor (1) by partial combustion of the spent liquor is brought together in direct contact with spent liquor, which may have been pre-evaporated, in a first stage--for example a venturi scrubber--, with alkali metal compounds, etc., which have been gasified in the combustion gas, being returned to the reactor together with the concentrated spent liquor, after which the combustion gas, preferably in at least one additional stage, is permitted, directly or indirectly, to give off additional evaporation heat to the spent liquor.
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