热水预水解对杨木半纤维素提取及后续硫酸盐法制浆的影响

Effect of Autohydrolysis on Pre-extraction of Hemicelluloses and Subsequent Kraft Pulping of Triploid Poplar

中文关键词:  生物质精炼  半纤维素  热水预水解  P因子  聚戊糖提取率

Key Words:biorefinery  hemicellulose  autohydrolysis  P-factor  extraction ratio of pentosan

中文摘要:

      基于制浆造纸过程中的生物质精炼理念，利用热水预水解预先提取杨木木片中的半纤维素，然后对水解后的木片进行硫酸盐法蒸煮，探讨预水解因子（P因子）对半纤维素提取和后续硫酸盐法制浆的影响。研究结果表明，热水预水解对半纤维素的提取效果显著，且P因子可较好地控制预水解反应过程；预水解处理能提高后续硫酸盐法蒸煮脱木素的效果，降低蒸煮用碱量，但会增大后续浆料打浆难度，同时降低成纸的某些物理性能。综合考虑后续水解液的生物质利用和水解木片的硫酸盐法制浆，当P因子为608~1060时，水解液中的聚戊糖提取率为33.18%~35.31%，相应的预水解KP制浆得率为39.47%~37.12%;与未经热水预水解处理的对照样相比，热水预水解处理后浆料性能和黑液性能均较好。

Abstract:

      Based on the concept of biorefinery in pulp and paper industry, pre-extracting hemicelluloses sugars from poplar chips via autohydrolysis was carried out , and then the extracted chips were used for the kraft pulping. The influence of P-factor on pre-hydrolysis and subsequent kraft pulping were investigated. The results indicated that autohydrolysis is a satisfactory process for pre-extracting hemicelluloses, and the autohydrolysis process can be well controlled by the P-factor. Besides, autohydrolysis treatment can significantly improve the deligninfication efficiency in subsequent kraft pulping, decrease the EA charge at the sacrifice of the beatability of the pulp and some physical properties of the paper. Considering the subsequent biomass utilization of pre-hydrolysis and pulping performance of the treated wood chips, the P-factor of autohydrolysis is controlled in the range from 608 to 1060, which the extraction rate of pentosan in pre-hydrolysate is from 33.18% to 35.31% and the yield of the kraft pulp is from 39.47% to 37.12%. Compared with the control sample, the properties of the kraft pulp and the pulping black liquor of the pre-hydrolysis treated sample are better at the reasonable P-factor.