METHOD FOR REFINING AND UPGRADING PAPER GRADE CHEMICAL PULP TO DISSOLVING PULP

The present invention discloses a method for refining and upgrading a paper grade chemical pulp to a dissolving pulp. The chemical pulp is treated with y-valerolactone to dissolve hemicellulose in the chemical pulp， to obtain an c-cellulose pulp with high purity， which is the dissolving pulp. The y-valerolactone is an important solvent for cleanly producing biomass and also is a novel， highly-efficient， green organic solvent with excellent characteristics. The y-valerolactone can be miscible with water in any ratio， does not produce peroxide with air， is a stable chemical substance， and can be recycled and reused. The y-valerolactone effectively removes a large amount of hemicellulose in the chemical pulp to obtain a refined chemical pulp of high-purity cellulose. The resultant chemical pulp achieves all critical property indexes of a commercially available dissolving pulp， thus alleviating the increasing demand for the dissolving pulp to a certain extent and playing an important role in the clean and simplified production for the dissolving pulp.

本发明公开了一种将造纸用化学浆精制升级为溶解浆的方法。该方法采用γ-戊内酯（γ-valerolactone）处理化学浆，使其中的半纤维素溶出，从而获得高纯度的C型纤维素浆，该浆即为溶解浆。γ-戊内酯是清洁生产生物质的重要溶剂，同时也是一类新型、高效、绿色的有机溶剂，性能优异。它可与水以任意比例互溶，不会与空气发生反应生成过氧化物，化学性质稳定，可回收循环复用。γ-戊内酯可有效脱除化学浆中的大量半纤维素，得到高纯度纤维素精制浆。所得精制浆达到商用溶解浆的全部关键性能指标，在一定程度上缓解了当前对溶解浆日益增长的市场需求，对溶解浆的清洁化、简化生产具有重要意义。