Accelerated catalysis of olefinic epoxidations
    6.
    发明授权
    Accelerated catalysis of olefinic epoxidations 失效
    烯烃环氧化物的加速催化

    公开(公告)号:US5939568A

    公开(公告)日:1999-08-17

    申请号:US842732

    申请日:1997-04-16

    CPC classification number: C07D301/12

    Abstract: Rhenium-catalyzed epoxidation of olefinic substrates is accelerated by the use of acclerants having a nitrogenous aromatic heterocyclic structure. Use of the accelerants also enables the use of aqueous hydrogen peroxide as an oxidant. To achieve optimum acceleration, the accelerant should have a concentration within a range from 2.0 mole percent to 100 mole percent of the acclerant with respect to 1 mole of the olefinic substrate. Use of the accelerant also results in an increased yield with respect to the conversion of the olefinic substrate to epoxide product.

    Abstract translation: 通过使用具有含氮芳族杂环结构的增加剂来加速烯属底物的铼催化环氧化。 使用促进剂也可以使用过氧化氢水溶液作为氧化剂。 为了达到最佳加速,促进剂的浓度应在1摩尔烯属底物的2.0摩尔%至100摩尔百分数之间。 促进剂的使用也导致相对于烯属底物转化为环氧化物产物的增加的产率。

    Cooling device for plastic granulate
    7.
    发明授权
    Cooling device for plastic granulate 失效
    塑料颗粒冷却装置

    公开(公告)号:US4850835A

    公开(公告)日:1989-07-25

    申请号:US89229

    申请日:1987-08-25

    Inventor: Joachim Rudolph

    CPC classification number: B29B9/06 B29B13/045

    Abstract: A cooling device for plastic granulate which is formed by cutting plastic strands emerging from a nozzle plate of an extruder and is fed to a stream of cooling water which adjoins the nozzle plate in the region of a cutting device. A pipe conducts the stream of cooling water containing the granulate to a granulate-water separator. In order to obtain a well-defined, infinitely adjustable dwell time of the granulate in the stream of cooling water, the pipe is essentially developed as a vertically arranged riser having a larger cross section passage area than that of the pipe itself. The upper outlet end of the riser is connected to the suction side of a feed pump, which serves as a section pump, and to a suction pipe which has an end connected to ambient atmosphere. A regulating valve is connected in the suction pipe. The delivery side of the feed pump communicates with the granulate-water separator.

    Abstract translation: 一种用于塑料颗粒的冷却装置,其通过切割从挤出机的喷嘴板出来的塑料线而形成,并且在切割装置的区域中被供给到与喷嘴板相邻的冷却水流。 管道将含有颗粒的冷却水流导向颗粒 - 水分离器。 为了在冷却水流中获得明确定义的无限可调的颗粒状停留时间,管道基本上显影为具有比管道本身更大的横截面通道面积的垂直布置的提升管。 提升管的上出口端连接到作为分段泵的进料泵的吸入侧和连接到环境大气的端部的吸入管。 调节阀连接在吸入管中。 进料泵的输送侧与颗粒 - 水分离器连通。

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