摘要
将糠醛渣经苯酚液化和硫酸磺化改性,制备了糠醛渣基水煤浆添加剂(FRS);探讨了FRS的磺化条件对低阶煤种成浆性能的影响;系统比较了FRS与3种市售添加剂(NDF、ASDF、ZM-19)的表面官能团、磺化度、相对分子质量、Zeta电位、与煤表面的接触角等特性;分析了添加剂对水煤浆的表观黏度、流动性、稳定性方面的影响;提出了FRS与煤粒表面的作用机制。结果表明:糠醛渣的最佳磺化工艺条件为糠醛渣液化物4.0 g、浓硫酸4.0 mL、磺化温度100℃、磺化时间1.5 h;4种添加剂均含有亲水性的官能团(-OH和-SO3H)及疏水性的芳环,其Zeta电位绝对值与磺化度的变化趋势一致;FRS与煤表面的接触角最小,润湿性最好。在难成浆煤种的制浆质量分数58%、添加剂占煤粉质量0.2%时,FRS对水煤浆的稳定性最好,原因在于FRS使煤粒表面以水化膜彼此分开,提高了水煤浆的稳定性。
The furfural residue based coal water slurry(CWS)additive(FRS)was prepared by phenol liquefaction and sulphuric acid sulfonation of furfural residue.The effects of sulfonation conditions of FRS on the slurry ability of low rank coal were discussed.The surface functional group,sulfonation degree,relative molecular mass,Zeta potential and contact angle of the FRS and three commercial additives(e.g.NDF,ASDF and ZM-19)were compared.Subsequently,the influence of the additives on the apparent viscosity,fluidity and stability of CWS were analyzed.Finally,the interaction mechanism between FRS and coal particle surface was proposed.The results show that the optimum sulfonation conditions of FRS are as follows:the dosage of liquefied furfural residue is 4.0 g,the amount of H2SO4 with a mass fraction of 98%is 4.0 mL,and the sulfonation reaction lasts for 1.5 h at 100℃.All additives contain hydrophilic functional groups(-OH and-SO3H)and hydrophobic aromatic rings,and the order of absolute value of Zeta potential is consistent with the change of sulfonation degree.The contact angle between FRS and coal surface is the smallest,and the wettability of FRS to coal surface is the best.When the mass fraction of CWS is 58%and the amount of additive is 0.2%of the mass of coal powder,CWS has the best stability with adding FRS.It is found that the coal particles are separated due to the formation of hydration membrane by adding FRS,which enhances the stability of CWS.
作者
陈小燕
李和平
刘万毅
宋满荣
孙艳艳
詹海鹃
CHEN Xiaoyan;LI Heping;LIU Wanyi;SONG Manrong;SUN Yanyan;ZHAN Haijuan(State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering,College of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China)
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2020年第5期1021-1030,共10页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
西部一流大学建设重大创新项目(ZKZD2017003)
宁夏回族自治区国内一流学科建设项目(NXYLXK2017A04)
宁夏大学自然科学基金项目(ZR1704)资助。
关键词
糠醛渣
液化和磺化
生物质基添加剂
低阶煤
水煤浆
furfural residue
liquefaction and sulfonation
biomass based additive
low-rank coal
coal water slurry
