Process for the epoxidation of propene

    公开(公告)号:US10125108B2

    公开(公告)日:2018-11-13

    申请号:US15570167

    申请日:2016-04-19

    摘要: In a process for the epoxidation of propene, comprising the steps: reacting propene with hydrogen peroxide in the presence of a titanium silicalite catalyst and a methanol solvent; separating non-reacted propene and propene oxide from the resulting reaction mixture to provide a solvent mixture comprising methanol and water in a combined amount of at least 90% by weight; and feeding this solvent mixture as a feed stream to a continuously operated methanol distillation column at a feed point in the middle section of said column to provide an overhead product comprising at least 90% by weight methanol and a bottoms product comprising at least 90% by weight water; the addition of a liquid defoamer, having a solubility in the feed stream of less than 10 mg/kg at 25° C. and a surface tension at the liquid air interface of less than 22 mN/m at 20° C., at or above the feed point in an amount exceeding the solubility of the liquid defoamer in the feed stream suppresses foam formation in the methanol distillation column.

    Coupling of two arenes with selenium dioxide to give a selenobiaryl ether

    公开(公告)号:US10106497B2

    公开(公告)日:2018-10-23

    申请号:US15157934

    申请日:2016-05-18

    IPC分类号: C07C391/02

    摘要: The present invention relates to a method for coupling two arenes with selenium dioxide to give a selenobiaryl ether. The method of the present invention includes: adding a first arene to the reaction mixture, adding a second arene to the reaction mixture, adding selenium dioxide to the reaction mixture, adding an acid having a pKa in the range from 0 to 5 to the reaction mixture, and adjusting the reaction temperature of the reaction mixture such that the first arene and the second arene are converted to a selenobiaryl ether. The present invention also relates to novel selenobiaryl ethers.

    Electroactive polymers, manufacturing process thereof, electrode and use thereof

    公开(公告)号:US10103384B2

    公开(公告)日:2018-10-16

    申请号:US14903864

    申请日:2013-07-09

    摘要: Disclosed is an oligomeric or polymeric compound comprising at least two structural units of formula (I) wherein Ar is a carbocyclic aromatic radical or a heterocyclic aromatic radical with the two carbonyl carbon atoms being attached to two ring carbon atoms of the Ar group forming together with the imide-nitrogen atom a five-membered or a six-membered ring X is a divalent group selected from —CR1R2—, —CO—, —SiR3R4—, —P(O)R5—, —P(O)(OR6)—, —PR7—, —P(OR8)—, —S(O)— or —S(O)2—. R1 to R8 independently of one another are hydrogen, alkyl, cycloalkyl, aryl or heteroaryl groups, R9 is a divalent hydrocarbon group or a covalent bond, and R10, R11 and R12 independently of one another are hydrogen or C1-C6 alkyl or R10 and R11 or R10 and R12 together with the carbon atoms to which they are attached form a cycloaliphatic ring or a bicyclic aliphatic system The oligomeric or polymeric compound comprising units of formula (I) of the invention can be used as redox-active material in storage means for electric energy, for example in batteries, redox-flow cells, fuel cells or capacitors.