棉短绒H2O2一步法蒸漂制浆的不足及对策

The Shortcomings and Solution of Cotton Linter Hydrogen Peroxide One-step Pulping and Bleaching Process

关键词:  棉短绒  蒸煮  蒸漂  H₂O₂  COD

Key Words:cotton linter  cooking  cooking and bleaching  H₂O₂  COD

摘要:现行棉短绒制浆采用H₂O₂一步法蒸漂制浆工艺，即棉短绒脱脂、去除木素、去疵点与H₂O₂氧化漂白同时进行，由于脱脂、去除木素、去疵点的最适宜温度与H₂O₂蒸漂不同，脱脂滞后于H₂O₂分解，降低了H₂O₂的利用率。本文分析了H₂O₂一步法蒸漂制浆的不足，并提出了3种改进措施，即采用二步法蒸漂制浆、混合蒸漂工艺及改进一步法蒸漂的升温曲线等，以提高H₂O₂的利用率，降低废水中的COD。

Abstract:The existing cotton linter hydrogen peroxide one-step pulping and bleaching process realized simultaneously degreasing and bleaching, however due to the difference of degreasing temperature and bleaching tempreature, it would cause low utilization rate of peroxide. This paper proposed to adorpt two-step process, in which cotton linter was degreased at first, then bleached with peroxide. This process could improve hydrogen peroxide utilization rate and reduce COD discharge.