文献类型：期刊文献

英文题名：Separation of 1,3,5-trimethylbenzene and 1,2,4-trimethylbenzene by metal-organic framework Co(aip)(bpy)0.5

作者：Jiang, Min[1];Wu, Yanyang[1];Wu, Bin[1];Chen, Kui[1];Ji, Lijun[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：157

外文期刊名：JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS

收录：;EI(收录号：20241015698793);WOS:【SCI-EXPANDED(收录号:WOS:001205505500001)】；

语种：英文

外文关键词：5-Trimethylbenzene; 4-Trimethylbenzene; Adsorption; Metal -organic framework

摘要：Background: The separation of trimethylbenzene isomers is one of the most challenging problems in chemical industry because of their similar boiling points and kinetic diameters. The adsorption performance of 1,3,5-trimethylbenzene (1,3,5-TMS) and 1,2,4-trimethylbenzene (1,2,4-TMS) (1,3,5-TMS/1,2,4-TMS = 1:1) on Co(aip) (bpy)0.5 with cobalt -based columnar lamellae were investigated in this paper. Methods: In this study, we used competitive adsorption experiments, kinetic and thermodynamic experiments, and regeneration experiments to investigate the adsorption amount and relative selectivity of 1,3,5-TMS and 1,2,4-TMS on Co(aip)(bpy)0.5, adsorption mechanism, and regeneration properties of Co(aip)(bpy)0.5. Significant findings: Competitive adsorption experiments showed that Co(aip)(bpy)0.5 presented the highest relative selectivity alpha 1,2,4-TMS/1,3,5-TMS among the eight MOFs studied. Both pseudo -first -order (PFO) and pseudosecond -order (PSO) kinetic models were used to fit the data, which indicated that the PSO model was more compatible. Thermodynamic data was fitted by Langmuir, Freundlich, and Temkin models, from which the Langmuir model was most suitable. Thermodynamic parameters demonstrated that the adsorption was spontaneous and exothermic. The alpha 1,2,4-TMS/1,3,5-TMS could reach 3.5 at 298.15 K. The crystal structure and adsorption experiments suggested that the separation of 1,3,5-TMS from 1,2,4-TMS on Co(aip)(bpy)0.5 was mainly due to 7C -7C interaction, unsaturated metal ions, and Lewis acid -base interaction. After five adsorption -regeneration cycles, the adsorption amount of 1,3,5-TMS and 1,2,4-TMS decreased by 0.12 % and 0.05 %, respectively, and alpha 1,2,4-TMS/ 1,3,5-TMS remained above 3.0.