converting the lime mud back into lime by heating in the limekiln.
a process to dissolve lignin by the use of chemicals in order to liberate the cellulose fibers. 
a major bleaching chemical that removes the colored lignin in brownstock.
the solution of chemicals used in pulping to remove the lignin.
chemi-thermo-mechanical pulping. A hybride high-yield pulping process that uses a mild chemical treatment followed by high temperature mechanical action to separate cellulose fibers.