Acid cellulase is an enzyme used in pulp bleaching procedures in the paper and pulp industry. In order to attain the appropriate brightness and whiteness of the finished paper product, pulp bleaching—a vital stage in the production of paper—involves removing lignin and other impurities from the pulp.

Acid cellulase and other cellulase enzymes are used in pulp bleaching as a part of the enzymatic treatment process. Acid cellulase works specifically on cellulose, the main building block of plant fiber’s, and aids in the breakdown and removal of lingering lignin and other non-cellulosic components from the pulp.