文章摘要
双酸型离子液体催化废PET醇解制备对苯二甲酸二丁酯的研究
Preparation of Plasticizer Dibutyl Terephthalate from n-Butanol Alcoholysis of Waste PET over Acidic Ionic Liquid
投稿时间:2017-12-21  修订日期:2018-01-08
DOI:
中文关键词: 双酸型离子液体  催化  醇解  PET
英文关键词: double acid ionic liquids  catalysis  alcoholysis  PET
基金项目:山东省重点研发计划(2015GSF116008、2016GGX107001),江苏省生物质能源与材料重点实验室开放基金(JSBEM201802)
作者单位E-mail
李海燕 青岛科技大学化工学院 1185179688@qq.com 
刘仕伟 青岛科技大学化工学院 liushiweiqust@126.com 
于世涛 青岛科技大学化工学院  
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中文摘要:
      针对对苯二甲酸直接酯化合成高值增塑剂对苯二甲酸二丁酯(DBTP)存在的原料价高难得、催化剂用量大、难分离且不可重复利用、三废排放量大等问题,本文以绿色环保、可循环使用的双酸型离子液体1-(3-磺酸)-丙基-3-甲基咪唑氯铁酸盐[HO3S-(CH2)3-mim]Cl-FeCl3(FeCl3摩尔分数为x=0.67)为催化剂,研究了正丁醇醇解廉价易得的废PET制备增塑剂对苯二甲酸二丁酯的反应。结果表明:在n(PET重复单元):n(正丁醇)1:3、m(PET):m(催化剂)5:1、反应温度210 oC、反应时间8 h较佳的反应条件下,PET醇解率为100%,产物DBTP和EG收率分别为97.5%和98.2%。同传统催化剂相比,离子液体催化剂的催化性能更高且可重复使用7次,其催化性能未见明显降低。傅立叶-红外光谱(FT-IR)分析表明:PET醇解过程是由链内酯键断裂和链末端酯键断裂协同完成。
英文摘要:
      Terephthalic acid dibutyl (DBTP) of high value plasticizer was synthesized with terephthalic acid by using a direct esterification method, which had some drawbacks, such as high raw material price, large emission of three industrial wastes, large amount and difficulty in separate and no reusable of catalyst. In order to solve such problems, a new type of environment-friendly and reusable catalyst, named B-L acidic ionic liquid (IL), was proposed to produce DBTP in this paper. It was found that IL 1-(3-sulfonic)-propyl-3-methylimidazolium chloroironinate [HO3S-(CH2)3-mim]Cl-FeCl3 (molar fraction of FeCl3, x = 0.67) was an efficient catalyst, and the optimum reaction conditions were obtained as follows: n(PET repeat units):n(n-Butanol)1:3, m(PET):m(catalyst)5:1, reaction time 8 h and reaction temperature 210 oC. Under the above reaction conditions, the conversion of PET reached 100%, and the yields of DBTP and EG were 97.5% and 98.2%, respectively. Additionally, the [HO3S-(CH2)3-mim]Cl-FeCl3(x=0.67) separated from the product could be reused for seven times without obvious decrease in its catalytic performance. The mechanism of PET chains scission was proved to be a combination of chain end and random chain scission by Fourier transform-infrared spectroscopy (FT-IR) analysis.
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