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公开(公告)号：US08080677B2
公开(公告)日：2011-12-20
申请号：US12206335
申请日：2008-09-08
申请人： Bala Subramaniam , Daryle H. Busch , Hyun-Jin Lee , Madhav Ghanta , Tie-Pan Shi
发明人： Bala Subramaniam , Daryle H. Busch , Hyun-Jin Lee , Madhav Ghanta , Tie-Pan Shi
IPC分类号： C07D303/00
CPC分类号： C07D301/12 , Y02P20/582
摘要： A process for the selective oxidation of olefins to epoxides comprising the step of contacting the olefin (propylene or ethylene) with an oxidant (hydrogen peroxide) in the presence of a Lewis acid oxidation catalyst (MTO), organic base (pyridine or its N-oxide), in a solvent system comprising an organic water-miscible solvent (methanol). The system is pressurized using either the olefin itself or by adding an inert pressurizing gas (nitrogen) to increase the pressure between 230 and 700 psi at a temperature between 0.7 and 1.3 times the critical temperature of the olefin. The resulting increased solubility of the olefin in the organic solvent system increases the selectivity and yield of the desired epoxide (propylene oxide or ethylene oxide).
摘要翻译： 一种将烯烃选择性氧化成环氧化物的方法，包括在路易斯酸氧化催化剂（MTO），有机碱（吡啶或其N-氧化物）存在下使烯烃（丙烯或乙烯）与氧化剂（过氧化氢）接触的步骤， 氧化物），在包含有机水混溶性溶剂（甲醇）的溶剂体系中。 使用烯烃本身或通过加入惰性加压气体（氮气）来加压系统，以在烯烃的临界温度的0.7至1.3倍之间的温度下增加230至700psi之间的压力。 所产生的烯烃在有机溶剂体系中的溶解度增加了所需环氧化物（环氧丙烷或环氧乙烷）的选择性和产率。
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公开(公告)号：US20150191442A1
公开(公告)日：2015-07-09
申请号：US14409503
申请日：2013-06-27
申请人： Bala Subramaniam , Anand Ramanathan , Madhav Ghanta , Wenjuan Yan
发明人： Bala Subramaniam , Anand Ramanathan , Madhav Ghanta , Wenjuan Yan
IPC分类号： C07D301/19
CPC分类号： C07D301/19 , C07D301/12
摘要： A process for epoxidizing an olefin comprising contacting an olefin with an oxidant in the presence of an insoluble oxidation catalyst in a solvent system comprising an organic water-miscible solvent to form an alkylene oxide. The insoluble oxidation catalyst comprises a metal, preferably selected from the group consisting of tungsten, cerium, and niobium. The metal is directly incorporated within a solid mesoporous silicate support, such as one selected from the group consisting of KIT-5, KIT-6, and TUD-1.
摘要翻译： 一种使烯烃环氧化的方法，包括使烯烃与氧化剂在不溶性氧化催化剂存在下在包含有机水混溶性溶剂的溶剂体系中接触以形成烯化氧。 不溶性氧化催化剂包含优选选自钨，铈和铌的金属。 将金属直接掺入固体介孔硅酸盐载体中，例如选自KIT-5，KIT-6和TUD-1的一种。
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公开(公告)号：US20210261714A1
公开(公告)日：2021-08-26
申请号：US17264111
申请日：2019-07-23
发明人： Madhav Ghanta
摘要： A process for the preparation of a 2,6-di(C1-7 alkyl)phenol composition includes reacting phenol and a C1-7 alkyl alcohol in the presence of a catalyst to form the 2,6-di(C1-7 alkyl)phenol; and isolating the 2,6-di(C1-7 alkyl)phenol composition by distillation N using a reflux ratio of greater than or equal to 4.0. The 2,6-di(C1-7 alkyl)phenol composition includes less than or equal to 0.2 wt % of chain-stopper impurities, based on the total weight of the 2,6-di(C1-7 alkyl)phenol composition. The 2,6-di(C1-7 alkyl)phenol composition can be useful for the preparation of poly(phenylene ethers).
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