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    Processes for purifying acetic anhydride
    4.
    发明授权
    Processes for purifying acetic anhydride 有权
    乙酸酐纯化方法

    公开(公告)号：US08759576B2

    公开(公告)日：2014-06-24

    申请号：US13605278

    申请日：2012-09-06

    Applicant: R. Jay Warner ,  Melchoir Meilchen ,  Nathan Kirk Powell

    Inventor： R. Jay Warner ,  Melchoir Meilchen ,  Nathan Kirk Powell

    IPC: C07C51/573 ,  C07C53/12

    CPC classification number: C07C53/12 ,  C07C51/56 ,  C07C51/573

    Abstract: In one embodiment, the invention is to a process for purifying acetic anhydride. The process includes the steps of feeding a liquid crude acetic anhydride stream directly to a distillation column and separating the liquid crude acetic anhydride stream to produce a light ends stream, a sidedraw and a residue stream. The sidedraw comprises substantially pure acetic anhydride product. The distillation column is operated at a pressure less than 101 kPa. The substantially pure acetic anhydride product comprises greater than 98 wt. % acetic anhydride, has a permanganate time of greater than 10 minutes, and has an APHA color of less than 10.

    Abstract translation: 在一个实施方案中，本发明涉及纯化乙酸酐的方法。 该方法包括以下步骤：将液体粗乙酸酐流直接供给到蒸馏塔中，并分离液体粗乙酸酐流以产生轻馏分物流，侧刮和残留物流。 侧面包括基本上纯的乙酸酐产物。 蒸馏塔在低于101kPa的压力下运行。 基本上纯的乙酸酐产物包含大于98wt。 ％乙酸酐，高锰酸盐时间大于10分钟，APHA颜色小于10。

    Method and apparatus for making acetic acid with improved purification
    6.
    发明申请
    Method and apparatus for making acetic acid with improved purification 有权
    制备乙酸改进纯化的方法和装置

    公开(公告)号：US20090088587A1

    公开(公告)日：2009-04-02

    申请号：US11904574

    申请日：2007-09-27

    Applicant: Nathan Kirk Powell

    Inventor： Nathan Kirk Powell

    IPC: C07C51/12 ,  B01J19/00 ,  C07C51/00

    CPC classification number: B01D3/32 ,  B01D3/143 ,  C07C51/12 ,  C07C53/08

    Abstract: An improved method of producing acetic acid includes condensing overhead vapor from a light ends column and decanting the condensed vapor to a light phase and a heavy phase. The heavy phase consists predominantly of methyl iodide and at least a portion of the decanted heavy phase is refluxed to the light ends column. Acetic acid content of the light ends column overhead stream and water content of the light ends column product (sidedraw) stream are both decreased, improving purification efficiency.

    Abstract translation: 制备乙酸的改进方法包括将来自轻馏分塔的塔顶蒸气冷凝并将冷凝的蒸汽倾析成轻相和重相。 重相主要由甲基碘组成，至少部分倾析的重相回流到轻馏分塔。 轻馏分柱塔顶馏出物的乙酸含量和轻馏分塔产物（双面）流的含水量均降低，提高了净化效率。

    Processes For Purifying Acetic Anhydride and Method of Making Same
    9.
    发明申请
    Processes For Purifying Acetic Anhydride and Method of Making Same 有权
    纯化乙酸酐的方法及其制备方法

    公开(公告)号：US20140066653A1

    公开(公告)日：2014-03-06

    申请号：US13605278

    申请日：2012-09-06

    Applicant: R. Jay Warner ,  Melchoir Meilchen ,  Nathan Kirk Powell

    Inventor： R. Jay Warner ,  Melchoir Meilchen ,  Nathan Kirk Powell

    IPC: C07C51/573 ,  B01D3/10 ,  C07C51/56

    CPC classification number: C07C53/12 ,  C07C51/56 ,  C07C51/573

    Abstract: In one embodiment, the invention is to a process for purifying acetic anhydride. The process includes the steps of feeding a liquid crude acetic anhydride stream directly to a distillation column and separating the liquid crude acetic anhydride stream to produce a light ends stream, a sidedraw and a residue stream. The sidedraw comprises substantially pure acetic anhydride product. The distillation column is operated at a pressure less than 101 kPa. The substantially pure acetic anhydride product comprises greater than 98 wt. % acetic anhydride, has a permanganate time of greater than 10 minutes, and has an APHA color of less than 10.

    Abstract translation: 在一个实施方案中，本发明涉及纯化乙酸酐的方法。 该方法包括以下步骤：将液体粗乙酸酐流直接供给到蒸馏塔中，并分离液体粗乙酸酐流以产生轻馏分物流，侧刮和残留物流。 侧面包括基本上纯的乙酸酐产物。 蒸馏塔在低于101kPa的压力下运行。 基本上纯的乙酸酐产物包含大于98wt。 ％乙酸酐，高锰酸盐时间大于10分钟，APHA颜色小于10。

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