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56 条记录 (耗时 0.014 秒)

    Method of removing foam during polymerization of vinyl chloride polymers
    13.
    发明授权
    Method of removing foam during polymerization of vinyl chloride polymers 失效
    在氯乙烯聚合物聚合过程中去除泡沫的方法

    公开(公告)号：US5807934A

    公开(公告)日：1998-09-15

    申请号：US708720

    申请日：1996-09-05

    申请人： Yasuhiro Takahashi ,  Takashi Kobayashi ,  Hitoshi Nakajima ,  Genji Noguki ,  Yoshitaka Okuno

    发明人： Yasuhiro Takahashi ,  Takashi Kobayashi ,  Hitoshi Nakajima ,  Genji Noguki ,  Yoshitaka Okuno

    IPC分类号： B01J19/00 ,  C08F2/18 ,  C08F6/00

    CPC分类号： B01J19/002 ,  C08F6/003 ,  B01J2219/0025

    摘要： The present invention provides a method of producing vinyl chloride polymers, including the steps of subjecting vinyl chloride monomer or a mixture of monomers containing vinyl chloride monomer to suspension polymerization reaction in an aqueous medium within a polymerization vessel equipped with a reflux condenser, and subsequently, after the completion of the polymerization reaction, recovering any unreacted monomer, wherein foam generated on the surface of the liquid phase inside the polymerization vessel is eliminated by discharging a high pressure water having a pressure of 20 kg/cm.sup.2 or more substantially linearly to the surface of the liquid phase. The high pressure water discharging is carried out at the polymerization step, particularly from the time when operation of the reflux condenser begins, and/or at the recovery step. A vinyl chloride polymer is thus obtained without the splashing of foam over the gaseous phase section of the polymerization vessel, regardless of whether the heat removal rate of the reflux condenser, or the recovery rate per unit time for the unreacted monomer are increased.

    摘要翻译： 本发明提供一种生产氯乙烯聚合物的方法，包括以下步骤：在装有回流冷凝器的聚合容器内，在含水介质中使氯乙烯单体或含有氯乙烯单体的单体混合物进行悬浮聚合反应，随后， 在聚合反应完成后，回收任何未反应的单体，其中通过将压力为20kg / cm2或更大的高压水排放到表面的基础上排除在聚合容器内的液相表面上产生的泡沫 的液相。 高压排水是在聚合步骤中进行的，特别是从回流冷凝器开始运转时和/或在回收步骤开始。 因此，无论回流冷凝器的除热率还是未反应单体的每单位时间的回收率都增加，由此获得氯乙烯聚合物而不会在聚合容器的气相部分上溅出泡沫。

    Method for maximizing the reaction volume in a slurry phase reactor
    19.
    发明授权
    Method for maximizing the reaction volume in a slurry phase reactor 有权

    公开(公告)号：US09850436B2

    公开(公告)日：2017-12-26

    申请号：US14758315

    申请日：2014-01-22

    申请人： ENI S.p.A.

    发明人： Alberto Maria Antonio Malandrino ,  Vincenzo Piccolo

    IPC分类号： H01L21/00 ,  H01L29/10 ,  C10G45/16 ,  H01L21/67 ,  B01J8/18 ,  B01J8/22 ,  C10G47/26 ,  C10G49/12

    CPC分类号： B01J8/22 ,  B01J8/1809 ,  B01J2208/00584 ,  B01J2219/002 ,  B01J2219/00209 ,  B01J2219/00243 ,  B01J2219/0025 ,  H01L21/67276

    摘要： Method for maximizing the reaction volume in a slurry phase reactor by determining the ratio (f) between the height of the foams (Hf) and the height of the reactor (HR) through an algorithm defining the gas hold-up in three zones, a first lower zone in which a bubble regime is established, a second intermediate zone where there can be the presence of foams, a third zone situated in the upper hemispherical part in which the multiphase mixture is accelerated until it reaches outlet conditions, the average gas hold-up being given by the weighted average of each of the three gas hold-ups of the three zones, characterized in that it uses nuclear densimeters positioned inside the reactor at different heights and comprises: measuring, for each nuclear densimeter used, gas density values, relating to different gas and/or slurry velocities, which correspond through said algorithm to calculated gas hold-up values, revealing, with a calculated gas hold-up of less than 40%, the absence of foams at least up to the height at which the densimeter is positioned, whose density measured corresponds to said gas hold-up, with a calculated gas hold-up higher than 70%, the presence of foams starting at least from the height of the reactor in which the densimeter is positioned, whose density measured corresponds to said gas hold-up, finally, determining through said algorithm, the ratio f and the extension in height of the possible presence of foams, calculating the consequent height Hf.