公开(公告)号：US06245196B1

公开(公告)日：2001-06-12

申请号：US09241617

申请日：1999-02-02

Applicant: Pierre Henri Rene Martin ,  Jacobo Kogan ,  Ka Kee Ho ,  Peter Campbell

Inventor： Pierre Henri Rene Martin ,  Jacobo Kogan ,  Ka Kee Ho ,  Peter Campbell

IPC: D21C900

CPC classification number: D21C9/004 ,  D21C9/02

Abstract: The process of the present invention purposefully precipitates a portion of the dissolved lignin onto pulp fibers to improve pulp yield of unbleached pulp. The resulting retention of lignin on the pulp creates an increase in pulp yield. Washing the pulp in a series of washer stages sequentially removes entrained lignin. Between each of the washer stages, adding dilution water repulps a pulp mat that exits from a prior washer stage and creates a pulp stream for a next washer stage. After at least one of the washer stages, adding an acidifying agent to the pulp stream forms a pulp product by precipitating the entrained lignin onto cellulosic fibers contained in the pulp stream. Finally, the process removes the pulp product from the series of washer stages with the pulp product having at least about a 1 unit increase in Kappa number.

Abstract translation: 本发明的方法有目的地将一部分溶解的木质素沉淀到纸浆纤维上，以改善未漂白纸浆的纸浆产量。 木质素在纸浆上的保留产生了纸浆产量的增加。 在一系列洗衣机阶段洗涤纸浆，依次除去夹带的木质素。 在每个洗涤器阶段之间，加入稀释水将从先前的洗涤器阶段排出的纸浆垫重新制浆，并产生用于下一个洗衣机阶段的纸浆流。 在至少一个洗衣机阶段之后，通过将夹带的木质素沉淀到纸浆流中所含的纤维素纤维上，向纸浆流中加入酸化剂形成纸浆产物。 最后，该方法从一系列洗衣机阶段除去纸浆产品，纸浆产品具有至少约1单位卡帕值增加。