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    Process for Preparing Isocyanates
    12.
    发明申请
    Process for Preparing Isocyanates 有权

    公开(公告)号：US20210139637A1

    公开(公告)日：2021-05-13

    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

    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.

    METHOD OF TREATING HIGH-SOLIDS MINERAL SLURRIES WITH POLYMERIC FLOCCULANTS
    13.
    发明申请
    METHOD OF TREATING HIGH-SOLIDS MINERAL SLURRIES WITH POLYMERIC FLOCCULANTS 审中-公开

    公开(公告)号：US20190152814A1

    公开(公告)日：2019-05-23

    申请号：US16096108

    申请日：2017-05-22

    Applicant: Dow Global Technologies LLC

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

    IPC: C02F1/56 ,  C02F11/147 ,  C02F11/121

    Abstract: The present invention relates to a method of dewatering an aqueous mineral suspension comprising introducing into the suspension a flocculating system comprising a mixture of polyethylene oxide polymers, in particular a mixture of one or more high molecular weight polyethylene oxide polymer and one or more ultra high molecular weight polyethylene oxide polymer. Said mixture of polyethylene oxide polymers is useful for the treatment of suspensions of particulate material, especially waste mineral slurries. The invention is particularly suitable for the treatment of tailings and other waste material resulting from mineral processing, in particular, the processing of oil sands tailings.

    TAILINGS TREATMENT PROCESS
    18.
    发明公开
    TAILINGS TREATMENT PROCESS 审中-公开

    公开(公告)号：US20230242432A1

    公开(公告)日：2023-08-03

    申请号：US18004792

    申请日：2021-07-08

    Applicant: Dow Global Technologies LLC

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

    IPC: C02F11/147 ,  C02F11/127

    CPC classification number: C02F11/147 ,  C02F11/127 ,  C02F2103/10

    Abstract: Embodiments relate to a continuous process for treating tailings that includes providing tailings for treatment having at least 10 wt % solids, providing a mixing apparatus having a first inlet for feeding the tailings, a second inlet for feeding a non-dispersion liquid flocculant that includes a polyethylene glycol having a weight average molecular weight from 100 g/mol to 2,000 g/mol, and an outlet for a mixture of the tailings and the non-dispersion liquid flocculant, continuously introducing into the mixing apparatus the tailings through the first inlet and the non-dispersion liquid flocculant through the second inlet, and allowing the tailings and the non-dispersion liquid flocculant to mix to from the mixture of the tailings and the non-dispersion liquid flocculant.

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