凹凸棒土的改性及其对二甲苯异构体的吸附性能.pdf

石油学报(石油加工
2014年12月 ACTA PE1ROLピ I SINICA(PETROLEUM PROCESSING SECTIO
第30卷第6期
文章编号:1001-8719(2014)06-1016-06
凹凸棒土的改性及其对二甲苯异构体的吸附性能
部晖,姚鹛飞,钟璟,陈乐,姚超
常州大学石油化工学院江苏省绿色催化材料与技术重点实验室,江苏常州213164)
摘要:采用酸化处理和十六烷基三甲基溴化铵对凹凸棒土(简称凹上)进行改性,利用N2吸附-脱附和FT-1R对所
得凹土样品进行表征,并通过静态吸附实验研究了它们对二甲苯异构体的吸附行为,考察了初始质量分数、处理
方式等对其吸附性能的影响。结果表明,四上对二.甲苯异构体的平衡吸附量随着异构体初始质蚩分数的增大而增
大,相同条件下间二甲苯在円土上的吸附量大于其他昇构体;经过酸化处理和有机物改性后的凹±.对二甲苯异构
体的吸附性能优于原土,对间二甲苯的吸附量可达到74.06mg/g。二甲苯异构体在凹凸棒土上的吸附符合
langmuir方程。
关键词:四土改性;二甲苯异构体;吸附性能;吸附动力学
中图分类号:TQ424.21文献标识码:Adoi:10.3969/j-issa.1001-8719.2014.06.009
Modification of Attapulgite and Its Adsorption Performance for Xylene Isomers
SHAO Hui, YAO Pengfei, ZHONG Jing, CHEN Ie, YAO Chao
(Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Schol of Petrochemical Engineering
Changzhou Universit y, Changzhou 213164, China)
Abstract Attapulgite was treated by acid and modified with hexadecyltrimethylammonium bromide
to obtain alter-attapulgte. The attapulgite and modified attapulgite samples were characterized by
FT-IR and BET. A static adsorption equilibrium experiment of C aromatics in liquid phase was
carried out with the modified attapulgite samples as adsorbent, and the influences of Ca aromatics
initial concentration and modification methods for attapulgite were investigated. The results showed
that the equilibrium adsorption capacity of xylene on attapulgite increased with the increase of their
initial concentration, and the equilibrium adsorption capacity of meta-xylene (MX) was the biggest
among xylene isomers. The xylene had a higher adsorption capacity on attapulgite samples modified
by acid and CTAB than on the unmodified attapulgite, while the maximum adsorption capacity of
meta-xylene on the modified attapulgite was about 74.06 mg/g. The adsorption behavior of xylene
isomers on attapulgite was consistent with Langmuir isotherm equation.
Key words: attapulgite modification; xylene isomers; adsorption; adsorption kinetics
甲苯是工业上生产多种化学产品的主要原料,法由于成本低、设备简单易操作、吸附剂易于再生,
在甲苯歧化装置分离和重整汽油、饗解汽油和煤焦成为近年来分离二甲苯异构体的研究热点。常用于
油分离中常得到二甲苯的异构体。二甲苯(OX)、分离二甲苯的吸附剂有分子筛和碳材料。 Rasouli
间二甲苯(MX)和对二甲苯(PX)的沸点较接近,等采用水热法合成了不同硅/铝摩尔比的ZSM
传统的精馏分离难以实现,且能源消耗巨大。吸附分子筛,并将进行了Li,Na,K离子交换的ZSM-5
收稿日期:2013-11-08
基金项目:国家自然科学基金(21276029)、江苏省自然科学基金基础研究计划(EBK20131142)、常州市科技创新基金(C20120010)资助
通讯联系人:部晖,女,副教授,博土,主要从事分子筛的合成和分离技术;E-mail: shaohui2o800cczu:ecdu.cn