关键词: 麦草KP浆, 脱木质素, 漆酶

Abstract: Delignification of wheat straw kraft pulp with laccase mediator system(LMS) and the affecting factors including reaction time, temperature, dosage of laccase mediator on delignification were studied in this paper. The results indicate that in all of these factors, reaction time is of primary importance followed by temperature and dosage. By using LMS, Kappa number of wheat straw kraft pulp can be reduced seriously but reduction of viscosity is lower. The optimum conditions for the delignification of wheat straw kraft pulp with LMS are:reaction time 30 min, temperature 70℃ and dosage 0.07%. Under these conditions,30% delignification ratio can be obtained and the reduction of viscosity is only 15.3%.

Key words: wheat straw kraft pulp, delignification, laccase