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    Recovery of methacrolein
    1.
    发明授权
    Recovery of methacrolein 失效
    甲基丙烯醛的回收

    公开(公告)号：US4234519A

    公开(公告)日：1980-11-18

    申请号：US6824

    申请日：1979-01-26

    申请人： Neil Yeoman ,  Sidney S. Stern

    发明人： Neil Yeoman ,  Sidney S. Stern

    IPC分类号： C07C57/07 ,  C07C45/00 ,  C07C45/78 ,  C07C45/81 ,  C07C47/22 ,  C07C51/00 ,  C07C51/25 ,  C07C57/05 ,  C07C57/055 ,  C07C67/00 ,  C07C45/35 ,  C07C47/21

    CPC分类号： C07C45/81 ,  C07C45/783 ,  C07C51/252

    摘要： In the catalytic oxidation of isobutylene and/or tertiary butyl alcohol to methacrolein, the product methacrolein is recovered as an aqueous solution, which thereafter is stripped of methacrolein by contacting the solution with recycle gases from the subsequent oxidation of methacrolein to methacrylic acid. In a preferred embodiment, the oxidation reactor effluent gases are quenched to near ambient temperatures by direct contact with a recirculating stream of partially condensed effluent to provide an aqueous solution of methacrolein and thereafter the methacrolein remaining in the effluent gases is absorbed into a refrigerated water stream to provide a second aqueous solution. The aqueous solutions are combined and stripped by recycle gases, thereby supplying methacrolein as feed to the subsequent oxidation process.

    摘要翻译： 在异丁烯和/或叔丁醇向异丁烯醛的催化氧化中，产物甲基丙烯醛作为水溶液回收，然后通过使溶液与随后的甲基丙烯醛氧化成甲基丙烯酸的循环气体相接触而除去甲基丙烯醛。 在优选的实施方案中，氧化反应器流出气体通过与部分冷凝的流出物的再循环流直接接触而淬灭到接近环境温度，以提供甲基丙烯醛的水溶液，此后残存在流出气体中的甲基丙烯醛被吸收到冷冻水流 以提供第二水溶液。 将水溶液合并并通过再循环气体汽提，从而将甲基丙烯醛作为进料提供给随后的氧化过程。

    Pressure swing adsorption process for fractionating a multi-component mixture
    3.
    发明授权
    Pressure swing adsorption process for fractionating a multi-component mixture 失效
    用于分馏多组分混合物的变压吸附方法

    公开(公告)号：US5507857A

    公开(公告)日：1996-04-16

    申请号：US375435

    申请日：1995-01-19

    申请人： Ravi Kumar ,  Sidney S. Stern

    发明人： Ravi Kumar ,  Sidney S. Stern

    IPC分类号： B01D53/04 ,  B01D53/047

    CPC分类号： B01D53/047 ,  B01D2259/40003 ,  B01D2259/40064 ,  B01D2259/40079 ,  B01D2259/40081 ,  B01D2259/403 ,  B01D2259/41

    摘要： A method of rectifying a multicomponent mixture by pressure swing adsorption to separate primary and secondary components of the mixture. Two groups of adsorbent beds are used in the method and adsorbent beds of the two groups are employed in a paired relationship and subjected to feed, co-current depressurization, evacuation, and countercurrent repressurization stages. In the feed stages, pairs of the adsorbent beds are pressurized with the mixture to adsorb the primary component in a first group of the adsorbent beds and in an entry section of a second group of the adsorbent beds. Also during the feed stage, the secondary component is adsorbed in the second group of adsorbent beds in remaining sections thereof. During co-current depressurization, any of the secondary component adsorbed in the first group of adsorbent beds and part of the primary component is driven to the second group of adsorbent beds. The adsorbent beds are individually evacuated to produce primary and secondary product streams rich in the primary and secondary components, respectively. Countercurrent repressurization is effected with a waste stream comprising the effluent from the feed stage. The countercurrent repressurization stage functions to bring the adsorbent beds back up to operating pressure and to drive the primary component back into the first group of adsorbent beds.

    摘要翻译： 通过变压吸附对多组分混合物进行精馏以分离混合物的初级和次级组分的方法。 在该方法中使用两组吸附剂床，并且两组的吸附床以配对关系使用，并进行进料，并流减压，排空和逆流再加压阶段。 在进料阶段，成对的吸附床被混合物加压，以吸附第一组吸附剂床中的主要组分和第二组吸附剂床的入口部分。 此外，在进料阶段，次要组分在其余部分吸附在第二组吸附剂床中。 在并流减压期间，吸附在第一组吸附剂床和一部分主要组分中的任何次要组分被驱动到第二组吸附剂床。 分别抽吸吸附剂床以产生分别含有一级和二级组分的一级和二级产物流。 用包含来自进料级的流出物的废物流进行逆流再加压。 逆流再加压阶段用于使吸附剂床回到操作压力并将主要组分驱回第一组吸附剂床。

    Cryogenic rectification method and apparatus
    6.
    发明授权
    Cryogenic rectification method and apparatus 失效
    低温精馏方法及装置

    公开(公告)号：US5471842A

    公开(公告)日：1995-12-05

    申请号：US292126

    申请日：1994-08-17

    申请人： Robert A. Mostello ,  Sidney S. Stern

    发明人： Robert A. Mostello ,  Sidney S. Stern

    IPC分类号： F25J3/02 ,  F25J3/04

    CPC分类号： F25J3/04854 ,  F25J3/04078 ,  F25J3/0409 ,  F25J3/04284 ,  F25J3/04412 ,  F25J2200/94 ,  F25J2220/40 ,  F25J2235/52 ,  F25J2245/02

    摘要： A cryogenic rectification method for producing a product stream from a gaseous mixture having higher and lower volatility components and heavy impurities. In accordance with the method, the mixture is separated by a cryogenic rectification process employing one or more columns having plates, trays or packing for intimately contacting ascending vapor and descending liquid streams within the column. The mixture to be separated after having been compressed is combined with the recycle stream to produce a combined stream which is purified in a prepurification unit that is designed to remove the heavy contaminants. The combined steam is divided into major and minor streams. The major stream is then cooled and separated into liquid and vapor phases. Heavy impurities concentrate in the liquid phase taken as the recycle stream, which is then pumped to a high enough pressure for vaporization of the impurities. The resulting vapor is then reduced in pressure and combined with the incoming gaseous mixture. The concentration of heavy impurities in the vapor phase is reduced to a sufficient extent such that a product stream concentrated in the lower volatility component will have a reduction in its heavy impurity concentration. The product stream is pumped to pressure and vaporized against a portion of mixture using a boosted pressure subsidiary stream made up of a minor portion of the gaseous mixture.

    摘要翻译： 一种用于从具有较高和较低挥发性组分和重杂质的气体混合物制备产物流的低温精馏方法。 根据该方法，通过使用一个或多个具有板，盘或填料的柱子的低温精馏方法将混合物分离，以使塔内的上升蒸气和下降的液体流紧密接触。 在压缩后待分离的混合物与再循环料流混合以产生在预净化单元中净化的混合物流，其被设计成去除重污染物。 组合蒸汽分为主流和次流。 然后将主要流冷却并分离成液相和汽相。 重质杂质在作为再循环物流的液相中浓缩，然后将其泵送至足够高的压力以蒸发杂质。 然后将所得蒸气压降，并与进入的气体混合物组合。 气相中重杂质的浓度降低到足够的程度，使得浓缩在较低挥发性组分中的产物流将使其重杂质浓度降低。 使用由少部分气体混合物组成的增压压力副流，将产物流泵送至压力并蒸发一部分混合物。