摘要
以AlCl3和十六烷基三甲基溴化铵(CTAB)对凹凸棒土(ATP)进行改性,采用化学共沉淀法制备了Al_(2)O_(3)/ATP和CTAB/Al_(2)O_(3)/ATP复合吸附剂;利用N2吸附-脱附、XRD、TEM和FTIR等手段对制备的吸附剂进行表征;并通过静态吸附实验和动态吸附实验,分别考察3种ATP吸附剂对甲醇-碳酸二甲酯(MeOH-DMC)共沸体系的吸附分离性能,探究该吸附分离过程的动力学原理。结果表明:Al_(2)O_(3)的引入改善了ATP孔道结构,CTAB的引入降低了ATP的亲水性,因而CTAB/Al_(2)O_(3)/ATP复合材料对MeOH-DMC体系表现出良好的吸附分离性能,其对共沸体系2种组分吸附的选择性(S)为7.63,分离因子(α)为3.27。另外,动力学拟合结果表明,甲醇和碳酸二甲酯在3种ATP吸附剂上的吸附行为符合拟二级动力学模型,说明该吸附分离过程中化学吸附起主要作用。
Attapulgite(ATP)was modified by AlCl3 and cetyl trimethyl ammonium bromide(CTAB),and Al_(2)O_(3)/ATP and CTAB/Al_(2)O_(3)/ATP adsorbent were synthesized by the chemical co-precipitation method.The three ATP-based adsorbents were then characterized by different methods including N2 adsorption-desorption,XRD,TEM and FT-IR.Static and dynamic experiments were carried out to investigate the adsorptive separation performance of the three ATP-based adsorbents for methanol-dimethyl carbonate(MeOH-DMC)azeotropic system separately,as well as kinetics of adsorptive separation.Experimental results indicate that pore channel structure of ATP has been modified due to addition of Al_(2)O_(3),and the hydrophilicity of ATP becomes weak due to addition of CTAB as surface modification agent.Therefore,CTAB/Al_(2)O_(3)/ATP demonstrates better separation performance with separation factorαof 3.27 and selectivity S of 7.63.Kinetic simulation results indicate that adsorption behaviors of MeOH and DMC on the three ATP adsorbents are all pseudo-secondary-order(PSO)adsorption,which implies that chemisorption plays an important role during the separation process.
作者
孙雪妮
陈锶媛
谢洪德
解丹燕
王俊
韶晖
黄春香
SUN Xueni;CHEN Siyuan;XIE Hongde;XIE Danyan;WANG Jun;SHAO Hui;HUANG Chunxiang(School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China;School of Chemical Engineering and Material Science, Soochow University, Suzhou 215123, China)
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2021年第5期994-1001,共8页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家自然科学基金项目(21706017)
江苏省绿色催化材料与技术实验室开放课题项目(BM2012110)资助。
关键词
凹凸棒土
共沸物
吸附
碳酸二甲酯
有机改性
attapulgite
azeotrope
adsorption
dimethyl carbonate
organic modification
