催化学报 ›› 2024, Vol. 62: 124-130.DOI: 10.1016/S1872-2067(24)60071-9

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利用择形分子筛异构化亚甲基二苯胺

Sam Van Minnebruggena, Ka Yan Cheunga, Trees De Baerdemaekerb, Niels Van Velthovena, Matthias Degelina, Galahad O’Rourkea, Hiroto Toyodac, Andree Iemhoffb, Imke Mullerb, Andrei-Nicolae Parvulescub, Torsten Mattkeb, Jens Ferbitzb, 吴勤明d, 肖丰收d, Toshiyuki Yokoic, Nils Bottkeb, Dirk De Vosa,*()   

  1. a巴斯夫股份有限公司膜分离、吸附、催化和光谱学可持续解决方案中心(cMACS), 比利时
    b巴斯夫股份有限公司研究组, 德国
    c东京工业大学纳米空间催化研究所, 横滨, 日本
    d浙江大学化学系, 浙江杭州 310028, 中国
  • 收稿日期:2024-04-03 接受日期:2024-06-05 出版日期:2024-07-18 发布日期:2024-07-10
  • 通讯作者: 电子信箱: Dirk.devos@kuleuven.be (D. De Vos).

Isomerization of methylenedianilines using shape-selective zeolites

Sam Van Minnebruggena, Ka Yan Cheunga, Trees De Baerdemaekerb, Niels Van Velthovena, Matthias Degelina, Galahad O’Rourkea, Hiroto Toyodac, Andree Iemhoffb, Imke Mullerb, Andrei-Nicolae Parvulescub, Torsten Mattkeb, Jens Ferbitzb, Qinming Wud, Feng-Shou Xiaod, Toshiyuki Yokoic, Nils Bottkeb, Dirk De Vosa,*()   

  1. aCentre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), BASF SE, KU Leuven, 3001 Leuven, Belgium
    bGroup research, BASF SE, 67056 Ludwigshafen, Germany
    cNanospace Catalysis Unit, Tokyo Institute of Technology, 226-8503 Yokohama, Japan
    dDepartment of Chemistry, Zhejiang University, Hangzhou 310028, Zhejiang, China
  • Received:2024-04-03 Accepted:2024-06-05 Online:2024-07-18 Published:2024-07-10
  • Contact: E-mail: Dirk.devos@kuleuven.be (D. De Vos).

摘要:

亚甲基二苯胺(MDA)被广泛用作生产聚氨酯和聚异氰脲酸酯的中间体. 然而, 当前MDA的生产工艺在控制(4,4’/(2,4’+2,2’))异构体比例方面还存在局限. 其中, 4,4’-MDA被认为是最有价值的异构体. 尽管2,4'-MDA在市场上也有一定的需求, 但如果能将其有效地转化为4,4'-MDA, 将能显著提升其附加值.

本文在使用苯胺的条件下, 利用β分子筛等催化剂, 通过双分子机制, 可以选择性地将2,4'-MDA异构化为4,4'-MDA. 尽管实验显示, 多种酸性沸石具有较高的异构化活性, 但MCM-68(具有MSE拓扑结构)的催化性能尤为出色, 它不仅展现出高异构化活性, 而且具有很好的选择性. MCM-68主要催化2,4'-MDA异构化为4,4'-MDA, 而2,2'-MDA和低聚物的形成则可以忽略不计. 本文还深入探讨了该择形作用的原因, 并详细研究了酸位置在MSE分子筛孔道限制中的关键作用.

关键词: 铝分布, 多相催化, 异构化, 亚甲基二苯胺, 聚氨酯, 择形

Abstract:

Methylenedianilines (MDA) are widely used as intermediates in the production of polyurethanes and polyisocyanurates. The current routes for the production of MDA offer only limited control of the isomer ratio (4,4’/(2,4’+2,2’)), with 4,4’-MDA being the most valuable isomer. While 2,4’-MDA is also marketed, significant added value could be unlocked upon further steering the production towards 4,4’-MDA. We here show that zeolites such as Beta can selectively isomerize 2,4’-MDA towards the desired 4,4’-MDA via a bimolecular mechanism, in an aniline background. While several acid zeolites were found to be active isomerization catalysts, MCM-68 (MSE topology) in particular combines high isomerization activity with efficient shape-selective suppression of the formation of unwanted 2,2’-MDA and oligomers. The origin of this shape-selectivity was studied, highlighting the crucial role of the acid site location in the pore confinement of MSE zeolites.

Key words: Aluminum distribution, Heterogeneous catalysis, Isomerization, Methylenedianiline, Polyurethane, Shape-selectivity