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    • 113. 发明授权
    • Process for the preparation of alkaline earth metal alkylates having a
spherical particle form
    • 制备具有球形颗粒形式的碱金属金属烷基化物的方法
    • US5210334A
    • 1993-05-11
    • US807271
    • 1991-12-13
    • Burkhart StandkeHartwig RaulederHarald-Jurgen BiangardiHans-Joachim Kotzsch
    • Burkhart StandkeHartwig RaulederHarald-Jurgen BiangardiHans-Joachim Kotzsch
    • C07C29/70C07C29/68C07C31/30C08F4/02C08F10/00
    • C07C29/68C08F10/00
    • Alkaline earth metal alkylates having a spherical particle habit are prepared by dissolving an alkaline earth metal alkylate in a solvent, adding a second solvent which dissolves the alkaline earth metal alkylate only with difficulty or does not dissolve it at all, but which is homogeneously miscible with the solution of the alkaline earth metal alkylate in the first solvent, removing the first solvent and then removing the second solvent. The particle size can be controlled by means of the shear gradient during the precipitation or by the use of emulsion stabilizers. Emulsion stabilization leads to particles in the size range 0.5 to 20 .mu.m with a particularly narrow particle size distribution. Catalysts for polyolefin synthesis can be prepared on the basis of magnesium alkylates prepared by the process according to the invention. The polymer is advantageous with respect to particle habit and particle size distribution, compared with the prior art. A narrower particle size distribution, and thus a reduction in undesired oversize and undersized particles, and a smoother surface structure are achieved.
    • 通过将碱土金属烷基化物溶解在溶剂中来制备具有球形颗粒习惯的碱土金属烷基化物,仅添加溶解碱土金属烷基化物的第二溶剂难以完全溶解,或者完全不溶解,但是均匀混溶 将碱土金属烷基化物溶于第一溶剂中,除去第一溶剂,然后除去第二溶剂。 可以通过沉淀过程中的剪切梯度或使用乳液稳定剂来控制粒度。 乳液稳定化导致尺寸范围为0.5至20μm的颗粒,具有特别窄的粒度分布。 用于聚烯烃合成的催化剂可以基于通过根据本发明的方法制备的烷基烷基镁来制备。 与现有技术相比,聚合物在颗粒习性和粒度分布方面是有利的。 实现了较窄的粒度分布,从而减少了不想要的过大尺寸和尺寸过小的颗粒,并且实现了更平滑的表面结构。
    • 114. 发明授权
    • Method for the continuous production of potassium tert-butoxide
    • 连续生产叔丁醇钾的方法
    • US5053560A
    • 1991-10-01
    • US363292
    • 1989-06-07
    • Rheinhard MatthesHartwig RaulederHans-Joachim Vahlensieck
    • Rheinhard MatthesHartwig RaulederHans-Joachim Vahlensieck
    • C07C27/00C07C29/70C07C31/30C07C67/00
    • C07C29/70
    • A method for the continuous production of anhydrous potassium tert-butoxide in a packed distillation column, wherein aqueous potash lye is fed with excess tert-butyl alcohol to the top of the column. Water formed in the reaction as well as water brought in with the reactants is distilled out at the top using methylcyclohexane or n-heptane as withdrawing agent. The amount of the withdrawing agent and of the tert-butanol must be selected such that above the column boiler a content between 0.2 and 2 wt.-% of the withdrawing agent is present in the gas mixture, while the gas mixture in the middle of the column has either between 32 and 34 wt.-% of methylcyclohexane or 36 to 38 wt.-% of n-heptane. The water together with the withdrawing agent and tert-butanol is withdrawn from the top of the column and then condensed. The organic phase of the condensate is fed back to the column.
    • 在填充蒸馏塔中连续生产无水叔丁醇钾的方法,其中将钾盐水溶液加入到塔顶部的过量叔丁醇。 在反应中形成的水​​以及与反应物一起引入的水在顶部使用甲基环己烷或正庚烷作为萃取剂被蒸馏出来。 取出剂和叔丁醇的量必须选择为使得在塔式锅炉以上,在气体混合物中存在取出剂的0.2至2重量%的含量,而在中间的气体混合物 该柱具有32至34重量%的甲基环己烷或36至38重量%的正庚烷。 将水与萃取剂和叔丁醇一起从塔顶排出,然后冷凝。 将冷凝物的有机相反馈回塔中。