摘要
以多金属氧酸盐Na8[PMo7V5O40]为介体,对杨木硫酸盐浆进行了电化学介体脱木素的研究.结果表明,采用钌钛涂层电极为阳极,不锈钢为阴极,以Na8[PMo7V5O40]为介体对杨木硫酸盐浆进行无隔膜电化学处理,能够有效脱除纸浆中的残余木素,而浆的黏度损失不大.Na8[PMo7V5O40]最优的电化学介体脱木素条件为:Na8[PMo7V5O40]浓度5 mmol/L,电压2.5V,温度80℃,时间7h,pH值2.0～3.0,Na2SO4用量0.1mol/L.该条件下,纸浆卡伯值从17.3降至11.4,黏度从1018 mL/g降至846 mL/g.电化学处理后的废液可进行多次循环使用.
The electrochemically mediated delignifieation of popular Kraft pulp, in which the polyoxometalates- Na6[PMo7V5O40] was taken as the medium, was investigated in this paper. The results showed that the residual lignin could be effectively removed without evident loss of pulp viscosity by dectrolysis of the electrolyte containing trace amount of Na6[PMo7V5O40] and 0. 1mol/L Na2SO4 in the electrolysis cell with rutheniumtitanium coated titanium as anode and stainless steel as cathode. The optimum process parameters for Na6[PMo7V5O40] used as medium in the electrochemically mediated deligaification were as follows： Na6[PMo7V5O40] ：5mnol/L, voltage： 2.5V, temperature： 80℃, treatment time： 7h, pH： 2.0- 3. 0 and Na2SO4 0. lmol/L. Under the optimum conditions the pulp Kappa number could be reduced from 17.3 to 11.4 and pulp viscosity was decreased from 1018mL/g to 846mL/g. In addition, the effluents of electrochemically mediated delignification could be reused without new chemicals addition.
出处
《中国造纸学报》
EI
CAS
CSCD
2005年第2期59-63,共5页
Transactions of China Pulp and Paper
关键词
电化学
介体
杨木硫酸盐浆
多金属氧酸盐
electrochemistry
mediated delignification
popular Kraft pulp
polyoxometalates
