公开(公告)号：WO1983001263A1

公开(公告)日：1983-04-14

申请号：PCT/US1981001333

申请日：1981-10-05

Applicant: WEYERHAEUSER COMPANY

Inventor： WEYERHAEUSER COMPANY ,  LEE, Peter, F.

IPC: D21C09/06

CPC classification number: D21C9/02

Abstract: Improved displacement washing process for recovering processing chemicals from a porous medium, particularly wood pulp. The effective mobility of a displacing solution, typically a more dilute solution of the chemical sought to be recovered, is reduced such that it is less than the mobility of the solution to be recovered. In a pulp mill washing system, consumption of wash water may be reduced 0.6 tons of water per ton of pulp produced without reducing chemical recovery. Conversely, chemical effluent from the washer could be reduced by 50% without increasing wash water requirement. Mobility is proportional to the permeability of the porous medium with respect to the solution of interest and inversely proportional to the viscosity of that solution. Mobility of the wash solution relative to the solution to be displaced is preferrably reduced by the addition of a soluble, high molecular weight polymer, greater than 10 , until the ratio of the mobility of the wash solution to that of the chemical rich solution is in the range of 0.05-2.0, preferably within the range 0.2-1. As examples, copolymers of acrylamide and acrylic acid, carboxypolymethylene, polyacrylic acid and deacetylated chitin have been found to be effective in reducing mobility. The presence of 6-10 ppm of a copolymer of acrylamide and acrylic acid of MW greater than 10 in the wash solution of a brownstock washer can double the efficiency of the washer.

Abstract translation: 用于从多孔介质，特别是木浆中回收处理化学品的改进的置换清洗方法。 替代溶液（通常是寻求回收的化学品的更稀溶液）的有效迁移率被降低，使得其低于待回收溶液的迁移率。 在纸浆清洗系统中，洗涤水的消耗量可以减少每吨纸浆0.6吨的水，而不会减少化学品的回收。 相反，来自洗衣机的化学品流出物可以减少50％，而不增加洗涤水需求。 流动性与多孔介质相对于目标溶液的渗透性成比例，并与该溶液的粘度成反比。 通过添加大于10 6的可溶性高分子量聚合物，洗涤溶液相对于被置换的溶液的流动性优选地降低，直到洗涤液的迁移率与富含化学物质的比例 溶液在0.05-2.0的范围内，优选在0.2-1的范围内。 作为实例，已经发现丙烯酰胺和丙烯酸，羧基聚亚甲基，聚丙烯酸和脱乙酰化几丁质的共聚物在降低迁移率方面是有效的。 在布朗斯克洗涤剂的洗涤溶液中存在6-10ppm丙烯酰胺和MW大于10 6的丙烯酸的共聚物可以使洗衣机的效率提高一倍。