Process for recovering chemicals and energy from cellulose spent liquor using multiple gasifiers
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United States of America Patent
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-
Feb 29, 2000
Issued Date -
N/A
app pub date -
May 2, 1997
filing date -
Nov 4, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
Provided is a process for recovering chemicals and energy from spent liquor obtained when producing paper pulp by chemical delignificatation of fibrous raw material. The spent liquor is gasified in at least two reactors, a first and a second stream of solid and/or smelt material and of combustible gaseous material being formed. The formed material is treated in one or more devices (5, 6, 7, 8), whereby a first (9) and a second liquor (27) are formed. The pressure and/or temperature in the first reactor differ(s) from the pressure and/or temperature in the second reactor. In addition, one or more process chemicals are recovered selectively from the formed liquor and/or gas, and are thereafter returned in whole or in part to one or more of the reactors (1, 2) and/or to one or more of the devices (5, 6, 7, 8) for treatment of the formed material.
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