Patent ID: 6790313
Filing Date: 2004-09-14
Classification: D21C

Abstract:
A method of removing sulphides and other volatile contaminants from liquor vapor condensate from a pulp manufacturing process, comprising, feeding said liquor vapor condensate from a pulp manufacturing process into a stripper (1), which is part of a closed loop comprising said stripper (1) a regenerative thermal oxidizer process (RTO)(2) and an SO2 scrubber (3), in which loop a gas (4), comprising air and components formed or stripped off in the loop, are circulated, and where the circulating gas is used to strip off sulphides and other volatile components from the liquor vapor condensate from a pulp manufacturing process (5), whereafter the gas stream (6) exiting said stripper (1) is fed into said RTO-process (2), where the stripped off components are combusted forming an SO2 enriched gas, and thereafter feeding the SO2 enriched gas (7) to the SO2 scrubber (3), whereafter the circulating gas is returned to the stripper (1).