Further development of dissolving pulp production processes

该项目旨在建立新不伦瑞克大学倪永浩博士与Neucel Specialty Cellulose和AV Nackawic的合作。总体目标是：1)提高亚硫酸盐和预水解硫酸盐基溶解浆的质量；2)通过优化漂白装置的操作和使用低成本的木材材料来降低制造成本。 近年来，加拿大的溶解纸浆生产能力有了很大的扩大。该项目的成果将有利于这一不断增长的行业，特别是工业合作伙伴AV Nackawic和Neucel Specialty Cellulose，在优化生产成本的同时，生产出性能优越的溶解纸浆，从而提高其溶解纸浆产品在国际市场上的价值和竞争力。因此，拟议的计划与加拿大直接相关。 项目目标/交付成果包括： -开发布朗纸浆的酶前处理技术，旨在利用木聚糖酶或甘露聚糖酶和/或木聚糖酶/甘露聚糖酶和葡聚糖酶的混合物生产高纯度的溶解纸浆，用于阔叶木硫酸盐和亚硫酸盐溶解纸浆； -研究使用葡聚糖酶/机械处理作为后处理工艺，以提高溶解纸浆的质量； -探索将溶解纸浆分级，然后将酶处理概念应用于不同组分的可能性，以生产不同等级的溶解纸浆； -通过降低pH值来利用二氧化氯末段的剩余亚氯酸盐，从而降低漂白成本，并改善纸浆的性能，如纸浆白度和Fock活性； -开发以亚硫酸盐为基础的蒸煮技术，分别使用道格拉斯-冷杉、柏木、雪松、赤杨和甲虫杀死的松树，以符合目前磨坊的操作实践。

This project is to establish collaboration of Dr. Yonghao Ni of the University of New Brunswick with Neucel Specialty Cellulose and AV Nackawic. The overall objectives are: 1) to improve the quality of dissolving pulps from the sulfite and pre-hydrolysis kraft-based dissolving pulps; 2) to decrease the manufacturing cost by optimizing the bleaching plant operation and using low-cost wood material. The Canadian dissolving pulp production capacity has been expanded significantly in recent years. The results from the project will be beneficial to this growing sector, in particular the industrial partners, AV Nackawic and Neucel Specialty Cellulose, by producing dissolving pulps with superior properties while optimizing the production cost; hence, enhancing the value and competitiveness of their dissolving pulp products in the international market. Therefore, the proposed program is of direct relevance to Canada. The project objectives/ deliverables include: - To develop the enzymatic pre-treatment technologies for brownstock aiming to produce high-purity dissolving pulp using xylanase or mannase and/ or mixture of xylanase/ mannase with glucanase for hardwood kraft-based and sulfite-based dissolving pulps; - To investigate the use of glucanase/mechanical treatments as post-treatment processes to improve the quality of dissolving pulps; - To explore the potential of fractionating the dissolving pulp and then applying the enzymatic treatment concept on different fractions, so that different grades of dissolving pulp can be produced; - To utilize the residual chlorite in the final chlorine dioxide stage by lowering the pH so that the bleaching cost can be decreased, and the pulp properties, such as pulp brightness and Fock reactivity, can be improved; - To develop the sulfite-based cooking technologies for using Douglas-fir, cypress, cedar, alder and beetle-killed pine, respectively, in compliance with current mill operating practice.