PROCESS FOR GAS PHASE CHLORINE DIOXIDE DELIGNIFICATION

摘要

A process for delignifying high consistency cellulosic material having a kappa number of greater than 5 comprising contacting said cellulosic material with a gas phase containing chlorine dioxide for a sufficient amount of time to at least partially delignify said cellulosic material, wherein substantially all of chlorine dioxide in said gas phase reacts with said cellulosic material during said contacting time; and separating the spent gas phase from said delignified cellulosic material, said spent gas phase is substantially free of chlorine dioxide.