全棉秆BCTMP脱果胶预处理工艺研究

Research on Scouring Pretreatment of Cotton Stalk for BCTMP

针对棉秆皮部果胶质含量高,全棉秆浆可漂性差的特点,分别考察了NaOH和Na2C2O4对棉秆原料的脱果胶效果,并将BCTMP工艺的原料预处理方法由汽蒸或热水浸泡改为添加脱果胶试剂的预处理过程,有效减轻了皮部果胶组分对成浆可漂性的不良影响,在温度90℃、草酸钠用量1.5%的预处理条件下,以3.5%NaOH、4%Na2SO3和3%H2O2制得ISO白度达64.5%的全棉秆BCTMP浆.

It＇s hard to bleach the pulp from cotton stalk due to the high content of pectin in its husk. In this paper, the efficiency of scouring with NaOH or Na2C2O4 is studied respectively, and the scouring pretreating process is introduced to BCTMP to treat the husk of cotton stalk more hardly, instead of the traditional presteaming process, It shows that the new pretreatment process can considerably lighten the blight to bleaching capability of the pulp caused by pectin in the husk of cotton stalk, and get BCTMP with a ISO brightness of 64.5% by pulping conditions as： 3.5%NaOH, 4%Na2SO3 and 3%H2O2 after pretreating with 1.5% Na2C2O4 in temperature of 90 ℃.