Enzymes in Bleaching of Kraft Pulp

摘要

Cellulose pulp produced by the kraft pulping process is the predominant rawmaterial for production of paper. Although most of the wood lignin is removed during kraft pulping the residual brown-colored lignin must be removed and the brightness of the pulp increased in a multi-stage bleaching processes prior to paper production. Due to their environmental impacts the use of chlorine chemicals in bleaching is decreased and new, alternative bleaching chemicals and processes are actively being studied. The most feasible biotechnical alternative in the bleaching of kraft pulp is treatment with enzymes. In the work the use of enzymes affecting either lignin or hemicellulose was studied as a pretreatment for bleaching of kraft pulp. (Copyright (c) Valtion teknillinen tutkimuskeskus (VTT) 1992.)