Patent ID: 6315861
Filing Date: 2001-11-13
Classification: B01D,C01B,D21C,Y02C,Y02P

Abstract:
A method for conditioning an ozone gas recycle stream in an ozone pulp bleaching process, comprising:providing an oxygen containing feed gas to an ozone generator;generating ozone from said feed gas to produce an ozone rich oxygen gas;bleaching pulp with said ozone rich gas, thereby producing an exhaust gas containing contaminants including carbon dioxide and entrained pulp fibers;removing at least some of said contaminants by at least removing entrained pulp fibers from the exhaust gas to produce a recycle gas;directing said recycle gas into the ozone generator to provide at least a portion of said oxygen containing feed gas; andremoving carbon dioxide during said contaminant removal step in an amount sufficient to a level of about 6 wt. % to thus allow operation of the ozone generator at or approaching full capacity.