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    VACUUM-ASSISTED PROCESS FOR PREPARING AN ION-EXCHANGED ZEOLITE MEMBRANE
    2.
    发明申请
    VACUUM-ASSISTED PROCESS FOR PREPARING AN ION-EXCHANGED ZEOLITE MEMBRANE 审中-公开
    用于制备离子交换的沸石膜的真空辅助方法

    公开(公告)号：US20160279625A1

    公开(公告)日：2016-09-29

    申请号：US14890549

    申请日：2014-04-22

    Applicant: DOW GLOBAL TECHNOLOGIES LLC ,  GEORGIA TECH RESEARCH CORPORATION

    Inventor： Sankar Nair ,  Seok Jhin Kim ,  Yujun Liu ,  John G. Pendergast ,  Ravindra S. Dixit ,  Jason S. Moore

    IPC: B01J35/06 ,  B01D67/00 ,  B01J20/28 ,  B01J29/40 ,  B01J20/18 ,  B01J20/30 ,  B01D71/02 ,  B01D69/02

    CPC classification number: B01J35/065 ,  B01D67/0051 ,  B01D67/0093 ,  B01D69/02 ,  B01D71/028 ,  B01D2323/08 ,  B01D2323/10 ,  B01D2325/42 ,  B01J20/186 ,  B01J20/28035 ,  B01J20/3085 ,  B01J29/085 ,  B01J29/405 ,  B01J29/7053 ,  B01J2229/186 ,  C01B39/08 ,  C01B39/082 ,  C01B39/40

    Abstract: Effect ion-exchange of an alpha-alumina supported zeolite (e.g. a MFI zeolite, an LTA zeolite or a FAU zeolite) membrane, which process comprises: a) placing the membrane, which has a first surface and a spaced apart second surface, the first and second surfaces defining therebetween the membrane, in an ion exchange apparatus such that the first surface is in contact with an ion exchange solution and the second surface is in contact with a vapor space that is connected to a source of reduced pressure; b) actuating the source of reduced pressure to create a pressure differential between the first and second membrane surfaces of at least 0.4 atmosphere (0.405×105 pascals); and c) maintaining the pressure differential under ion exchange conditions for a period of time sufficient to effect exchange of an ion contained in the ion exchange solution with an ion in the zeolite membrane in an amount that is greater than an amount of ion exchange attained using an apparatus that places the second surface in contact with a liquid solvent that is at a pressure of at least one atmosphere (1.013×105 pascals) and the first surface in contact with the ion exchange solution at a pressure of at least two atmospheres (2.026×105 pascals) so as to establish a pressure differential between the two surfaces of at least one atmosphere (1.013×105 pascals), maintaining the pressure differential for the same period of time, and using the same ion exchange membrane, ion exchange solution and ion exchange temperature, the greater amount of ion exchange yielding an improved ion exchange membrane that a ratio of the ion that entered the membrane from the solution to the ion that left the membrane that is greater than that of the ion exchanged membrane prepared with the second surface in contact with the liquid solvent.

    Abstract translation: 影响α-氧化铝负载的沸石（例如MFI沸石，LTA沸石或FAU沸石）膜的离子交换，该方法包括：a）将具有第一表面和间隔开的第二表面的膜， 在离子交换装置中，使得第一表面与离子交换溶液接触并且第二表面与连接到减压源的蒸汽空间接触，在隔膜之间限定隔膜的第一和第二表面; b）致动减压源以在第一和第二膜表面之间产生至少0.4个大气压（0.405×105帕斯卡）的压力差; 和c）在离子交换条件下保持压差足以使离子交换溶液中包含的离子与沸石膜中的离子以大于使用的离子交换量进行交换的时间 使第二表面与处于至少一个气压（1.013×10 5帕斯卡）的压力的液体溶剂接触并且在至少两个大气压的压力下与离子交换溶液接触的第一表面（2.026 ×105帕斯卡），以便在至少一个气氛（1.013×105帕斯卡）的两个表面之间建立压差，保持相同时间段的压力差，并使用相同的离子交换膜，离子交换溶液和 离子交换温度，更大量的离子交换产生改进的离子交换膜，从溶液到离子进入膜的离子的比例 留下的膜比用与液体溶剂接触的第二表面制备的离子交换膜的膜更大。

    Process for purification of vent streams
    5.
    发明授权
    Process for purification of vent streams 有权

    公开(公告)号：US10329399B2

    公开(公告)日：2019-06-25

    申请号：US15535801

    申请日：2015-11-09

    Applicant: DOW GLOBAL TECHNOLOGIES LLC

    Inventor： John G. Pendergast, Jr. ,  Johnny W. Masey ,  Robert D. Swindoll ,  Yujun Liu

    IPC: B01D53/14 ,  C07C7/11 ,  C08J11/02

    Abstract: Disclosed herein is a system for recovering olefins from a vent stream comprising an absorber; and a stripper; where the absorber and the stripper are in a recycle loop; and where the absorber is operative to treat a vent stream with a solvent to remove more than 99 wt % of a halogenated by-product contained in the vent stream and to recover 90 to 95 wt % of olefin molecules present in the vent stream; and where the stripper is operative to remove more than 99 wt % of the halogenated by-products present in the solvent; and where the solvent is recycled to the absorber.

    PROCESSES FOR PURIFYING GLYCOL ETHERS
    6.
    发明公开
    PROCESSES FOR PURIFYING GLYCOL ETHERS 审中-公开

    公开(公告)号：US20240150272A1

    公开(公告)日：2024-05-09

    申请号：US18548990

    申请日：2021-05-19

    Applicant: Dow Global Technologies LLC

    Inventor： Qi Jiang ,  Kaoru Ohba ,  Yujun Liu

    IPC: C07C41/42

    CPC classification number: C07C41/42

    Abstract: A processes for purifying glycol ethers, comprises (a) providing a glycol ether to a first vessel, the glycol ether, the glycol ether having the following formula: R1—O— (CHR2CHR3) O)nR4; wherein R1 is an alkyl group having 1 to 9 carbon atoms or a phenyl group; wherein R2 and R3 each individually is hydrogen, a methyl group or an ethyl group, provided that when R3 is a methyl group or an ethyl group, R2 is hydrogen and provided that when R2 is a methyl group or an ethyl group, R3 is hydrogen; wherein R4 is hydrogen, an alkyl group having 1 to 4 carbon atoms, an acetyl group, or a propionyl group; and wherein n is an integer of 1 to 3; (b) filling the first vessel with inert gas; (c) heating the glycol ether in the first vessel to a sub-boiling temperature, wherein the sub-boiling temperature is at least 15° C. less than the normal boiling point of the glycol ether; (d) cooling the vapor from the first vessel in a second vessel to provide a liquid; and (e) contacting the glycol ether with a mixed bed of ion exchange resins comprising cationic exchange resins and anionic ion exchange resins.

    PROCESSES FOR PURIFYING ORGANIC AMINES
    7.
    发明公开
    PROCESSES FOR PURIFYING ORGANIC AMINES 审中-公开

    公开(公告)号：US20240083837A1

    公开(公告)日：2024-03-14

    申请号：US18264127

    申请日：2021-05-19

    Applicant: Dow Global Technologies LLC ,  Dow Chemical Korea Limited

    Inventor： Qi Jiang ,  Kaoru Ohba ,  Yujun Liu ,  Jongcheol Kim ,  Xue Chen ,  Li Mu

    IPC: C07C213/10 ,  B01D15/36

    CPC classification number: C07C213/10 ,  B01D15/362 ,  B01D15/363

    Abstract: It is related to a process for purifying organic amines. The process comprises (a) providing an organic amine to a first vessel (5), the organic amine having a normal boiling point at one bar; (b) filling the first vessel (5) with inert gas; (c) heating the organic amine in the first vessel (5) to a sub-boiling temperature, wherein the sub-boiling temperature is at least 15° C. less than the normal boiling point; (d) cooling the vapor from the first vessel (5) in a second vessel (20) to provide a liquid; and (e) contacting the organic amine with a resin polymer matrix, wherein the resin polymer matrix is embedded with an amino compound selected from the group consisting of iminodiacetic acid, aminomethylphosphonic acid or a combination thereof.

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