木质素系高效分散剂对水煤浆制浆性能的影响  

EFFECTS OF EFFICIENT DISPERSANTS OF LIGNIN SERIES ON THE PREPARATION FEATURES OF COAL WATER SLURRY

作　　者：张娜娜[1] 杨东杰[1] 楼宏铭[1] 邱学青[1] 

机构地区：[1]广东省绿色化学产品技术重点实验室,华南理工大学化工与能源学院,广州510640

出　　处：《煤炭转化》2008年第1期42-47,共6页Coal Conversion

基　　金：国家自然科学基金资助项目(20676040);广东省自然科学重点基金资助项目(05103536).

摘　　要：以木质素磺酸钠为原料,通过磺化缩聚法合成一种木质素系水煤浆分散剂(GCL3S).水煤浆的流变性能测试表明,GCL3S对水煤浆的分散降黏能力优于萘磺酸盐甲醛缩合物系分散剂,GCL3S的分子量和磺化度是影响其对水煤浆分散降黏能力的主要因素,其中分子量的影响更为显著,适宜的分子量(特性黏度为6.84 mL/g^12.21 mL/g)和较高的磺化度(1.89mmol/g)有利于提高GCL3S对水煤浆的分散降黏性能.采用Herschel-Bulkley模型对掺GCL3S的水煤浆浆体的流变曲线进行拟合,研究了GCL3S的分子量和磺化度对水煤浆流变性的影响.By sulfonation and fasculation reaction,sodium lignin sulfonate was modified as a dispersant （GCL3S） of coal water slurry （CWS）. The molecular structure of the dispersant was studied and the molecular weight and the degree of sulfonation were found to be the key factors affecting its capability for reducing the viscosity of CWS,especially the molecular weight. Comparing with other dispersants of CWS showed that GCL3S has much better dispersing effect than nathphalene sulfonate formaldehyde condensate. The suitable molecular weight （the inherent viscosity is 6. 84 mL/g-12. 21 mL/g）and the higher degree of sulfonation （1. 89 mmol/g） are more effective for reducing the viscosity of CWS. The Haake rheometer was used to measure the rheological properties, and the shear-stress/shear rate data for each CWS prepared using GCL3S were fit to three-parameter Herschel-Bulkley model, and the effects of the molecular weight and the degree of sulfonation of GCL3S on rheological behavior of CWS were investigated.

关 键 词：木质素磺酸钠 分子量 磺化度 流变性 水煤浆 

分 类 号：TQ047[化学工程] TQ517.4