Process for cooling solid and gaseous material during gasification of spent liquor
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United States of America Patent
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May 15, 2007
Grant Date -
N/A
app pub date -
Mar 22, 2000
filing date -
Apr 1, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Process for the recovery of chemicals and energy from spent liquor obtained in the chemical pulping process, in which the spent liquor is gasified under sub-stoichiometric conditions to produce partly one phase of solid and/or fused material, together with partly one phase of a flammable gaseous material, whereafter the said phases are cooled by direct contact with a cooling medium (9), is separated from the said phase of flammable gaseous material in order to be dissolved and collected up as a product liquid in a product liquid receiver (11). According to the invention, the said cooling medium (9) consists of an essentially water-free cooling medium, which after vaporizing/cracking increases the calorific value of the flammable gaseous material drawn off. At the same time, the process is improved in this way since the flammable gases can be used more effectively for the purpose of e.g. generating energy.
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