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    Tailings Treatment Process
    7.
    发明申请
    Tailings Treatment Process 有权

    公开(公告)号：US20220081332A1

    公开(公告)日：2022-03-17

    申请号：US17419903

    申请日：2020-01-25

    Applicant: Dow Global Technologies LLC

    Inventor： Lizbeth Rostro ,  Wu Chen ,  Paul A. Gillis ,  Michael K. Poindexter

    IPC: C02F1/56 ,  C02F11/127 ,  C02F11/147 ,  B01F23/53 ,  B01F27/115 ,  B01F35/71

    Abstract: Embodiments relate continuous process for treating tailings that includes providing tailings for treatment having at least 20 wt % solids, providing a mixing apparatus having a first inlet for feeding the tailings, a second inlet for feeding flocculants, an outlet for a mixture of the tailings and flocculants, and a rotating disk, the first inlet being separate from the second inlet, the second inlet being above the rotating disk, and the rotating disk having a tip speed at least 2 m/s, continuously introducing into the mixing apparatus the tailings through the first inlet and the flocculants through the second inlet, allowing the tailings and the flocculants to mix on the rotating disk to form the mixture of the tailings and flocculants, continuously removing the mixture of the tailings and flocculants through the outlet to form a treated mixture, and flowing the treated mixture from the mixing apparatus for further treatment or to a disposal area.

    ONLINE ANALYSIS OF OIL SANDS TAILINGS CONTENT
    8.
    发明申请
    ONLINE ANALYSIS OF OIL SANDS TAILINGS CONTENT 有权

    公开(公告)号：US20210278390A1

    公开(公告)日：2021-09-09

    申请号：US16333857

    申请日：2017-10-04

    Applicant: Dow Global Technologies LLC

    Inventor： Paul A. Gillis ,  Jason S. Moore ,  Michael K. Poindexter

    IPC: G01N33/28 ,  G01N33/24 ,  G01N11/14 ,  C10G1/04

    Abstract: The present invention relates to a method for determining the clay content of an oil sands tailings stream. The method comprises treating an oil sands tailings stream with a PEO flocculant, passing the mixture through a dynamic mixer comprising a mixer shaft and a power drive for rotating said shaft, wherein the power input needed to maintain a mixer rotational speed (RPM) is measured. For an oil sands tailings stream having a specified solids content, the power measurement and PEO dosage level is correlated to a clay content characterization index, for example methylene blue index (MBI), to determine in real-time the clay content during the processing of an oil sands tailings stream.

    Process for preparing isocyanates
    10.
    发明授权
    Process for preparing isocyanates 有权

    公开(公告)号：US11225546B2

    公开(公告)日：2022-01-18

    申请号：US16491922

    申请日：2018-02-28

    Applicant: Dow Global Technologies LLC

    Inventor： Artur Klinger ,  Paul A. Gillis ,  Irfan Khan

    IPC: C08G18/76 ,  B01F5/04 ,  C07C263/10 ,  C07C265/14

    Abstract: A process for preparing an isocyanate product includes providing a phosgene inlet stream and an amine in solvent inlet stream to a phosgenation mixer, the amine in-solvent inlet stream including one or more amines and one or more inert solvents, and during steady state operation compensating for a fouling pressure drop increase by decreasing a pressure drop in the phosgenation mixer over a time period divided into at least a first period of time T1 and a second period of time T2 that is subsequent to the first period of time T1. During the second period of time T2 an amine concentration of the one or more amines in the amine-in-solvent stream is higher than during the first period of time T1, and during the second period of time T2 a phosgene-to-amine ratio value in the phosgenation mixer is higher than during the first period of time T1.

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