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›› 2010, Vol. 10 ›› Issue (1): 70-74.

• 反应与分离 • 上一篇    下一篇

Hb沸石催化合成对甲氧基苯乙酮及其反应物与产物的竞争吸附

陈平 翟玉春   

  1. 辽宁石油化工大学化学与材料科学学院 东北大学 材料与冶金学院
  • 收稿日期:2009-08-04 修回日期:2009-10-21 出版日期:2010-02-20 发布日期:2010-02-20
  • 通讯作者: 陈平

Synthesis of p-Methoxyacetophenone Catalysed with Hb Zeolite and Competitive Adsorption of the Reactants and Products

CHEN Ping ZHAI Yu-chun   

  1. School of Chemistry and Materials Science,Liaoning University of Petroleum & Chemical Technology College of Material and Metallurgy, Northeastern University
  • Received:2009-08-04 Revised:2009-10-21 Online:2010-02-20 Published:2010-02-20
  • Contact: CHEN Ping

摘要: 研究了无溶剂条件下,Hb沸石催化苯甲醚(AN)与乙酸酐(AA)的多相Friedel-Crafts酰化反应选择性生成对甲氧基苯乙酮(P-MOAP),探讨了反应物摩尔比、催化剂用量和反应温度对产品收率的影响. 在AN 0.1 mol,AN/AA摩尔比1:1.5,催化剂用量1.0 g,反应温度95℃,反应时间4 h的条件下,最终产品收率为73.25%. 利用Langmuir- Hinshelwood机理研究了该反应的动力学,结果表明,反应物和产物的竞争吸附是由于吸附平衡常数不同. 催化剂对产物P-MOAP的吸附远大于反应物,且提高反应温度,产物的吸附平衡常数降低.

关键词: 多相催化, Hb沸石, 苯甲醚, 乙酸酐, Friedel-Crafts酰基化, 竞争吸附

Abstract: The heterogenous Friedel-Crafts acylation of anisole with acetic anhydride using Hb zeolite as catalyst was carried out without any solvent. p-Methoxy acetophenone selectively and rapidly formed on the fresh zeolite catalyst. The effects of molar ratio of reactants, dosage of catalyst and reaction temperature on the yield of products were investigated. Under the feasible reaction conditions of anisole (AN) of 0.1 mol, anisole/acetic anhydride (AN/AA) molar ratio of 1:1.5, catalyst dosage of 1.0 g, reaction temperature of 95℃ and reaction time of 4 h, the highest yield of p-methoxy acetophenone was achieved up to 73.25%. The reaction kinetics was studied by Langmuir-Hinshelwood model. The adsorption equilibrium constants (AEC) for reactants and products as well as the rate constants for the acylation reaction were obtained respectively based on hypotheses of quasi-initial and quasi-stationary states. The result showed that the competitive adsorption effects of reactants and products resulted from differences in their adsorption equilibrium constants. The estimated values of AEC indicated that the acylation product p-methoxyacetophenone was adsorbed strongly more than the reactants. The AEC values of p-methoxyacetophenone decreased with the increase in reaction temperature.

Key words: heterocatalysis, Hb zeolites, anisole, acetic anhydride, Friedel-Crafts acylation, competitive adsorption

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