稻草酶预处理化机浆工艺条件研究

Study on the Technology of Rice Straw Biochemical Mechanical Pulping

关键词:  稻草  生物化机浆  生产工艺  木聚糖酶

Key Words:rice straw  Bio-CMP  technique  xylanase

摘要:对稻草酶预处理化机浆工艺进行研究，实验发现木聚糖酶较佳的用量为30 IU/g，化机浆的白度达到27.8%,裂断长为2.01 km,撕裂指数1.29 mN·m2/g；与低温磺化处理相比,NaOH处理更利于提高木聚糖酶的预处理效果且发现在化学处理前应用木聚糖酶处理意义较大,因为经过木聚糖酶预处理后便于药液进入原料内部与木素等成分作用。木聚糖酶、纤维素酶和果胶酶复配使用较佳的用量分别是20 IU/g浆、10 IU/g浆、15 IU/g浆,此时成浆纤维质量和成纸物理强度较好,耐破指数为1.18 kPa·m2/g,裂断长为2.23 km,环压指数为2.27 N·m/g，撕裂指数为4.49 mN·m2/g。

Abstract:In this paper,the technology of Bio-CMP pulping of rice straw was explored. The study found that when the dosage of xylanase was 30 IU/g based on dry straw, the pulp could reach brightness of 27.8% and acceptable physical property of paper. Compared with sulfonation treatment at low temperature, better results could be acquired through NaOH treatment. The xylanase pretreatment before chemical treatment had significance of practical application, it was beneficial for the chemicals to penetrate into internal structure of the materials and improve the reaction efficiency between the chemicals and the lignin. When the dosages of xylanase, cellulase, and pectinase were 20 IU/g, 10 IU/g and 15 IU/g, respectively, the quality of fiber and physical property of paper were better and the burst index of paper was 1.18 kPa·m2/g, breaking length was 2.23 km, ring crush index was 2.27 N·m/g and the tear index was 4.49 mN·m2 /g.