Method and device of removing and recycling metals from mixing acid solution

    公开(公告)号:US11976374B2

    公开(公告)日:2024-05-07

    申请号:US17017337

    申请日:2020-09-10

    CPC classification number: C25C1/08 B01J39/05 B01J39/18 B01J47/02 C01G51/003

    Abstract: A method and device of removing and recycling metals from a mixing acid solution, includes adsorbing a mixing acid solution with a pH value of −1 to 4 and a cobalt ion concentration of 100 to 1,000 mg/L by at least two cation resins in series setting to the cobalt ion concentration in the mixing acid solution is less than 10 mg/L, and then adjusting the pH value of the mixing acid solution after adsorption to meet a discharge standard, wherein the particle size of the at least two cation resins in series setting is 150˜1,200 μm. After the cation resins are saturated by adsorption, regenerating the cation resins by sulfuric acid to form a cobalt sulfate solution, and then electrolytically treating the cobalt sulfate solution to obtain electrolytic cobalt and sulfuric acid electrolyte. The operation process is simple without complicated equipment, and it can effectively recycle metals from mixing acid solutions. The cationic resin and sulfuric acid solution can also be reused, so the method of the present invention has environmental and economic benefits.

    HYDROGENATED NITRILE RUBBER WITH REDUCED CATALYST IMPURITY

    公开(公告)号:US20220220289A1

    公开(公告)日:2022-07-14

    申请号:US17568947

    申请日:2022-01-05

    Abstract: The residual hydrogenation catalyst from the hydrogenated nitrile rubber solution is recovered by using two steps such as (1) the catalyst extraction step with an ammonium salt and water (optionally including an oxidation step) to extract catalyst from the HNBR polymer chain to the solvent and then (2) the separation/column recovery step with the column packed with functional ion exchange resins for the separation of ammonia-catalyst complex from hydrogenated nitrile rubber solution and the column recovery for the high catalyst recovery with functional groups of resins. The ammonium salt for the catalyst extraction step is selected from ammonium chloride, ammonium bromide, ammonium iodide, and ammonium acetate. The functional groups in the functional ion exchange resins for packing the column is selected from thiourea, thiouronium, thiol, amine, diamine, triamine, TMT, dithiocarbamate, and carbodithioate.

    Methods for producing tetrahydrofuran

    公开(公告)号:US11149015B2

    公开(公告)日:2021-10-19

    申请号:US16782342

    申请日:2020-02-05

    Abstract: The present disclosure provides a method for producing tetrahydrofuran (THF). The method includes: feeding 1,4-butanediol into a reactive distillation apparatus; performing the dehydration reaction in the presence of an acidic catalyst; and producing the top stream containing product THF and the bottom stream from the reactive distillation apparatus, wherein a weight ratio of a water content in the bottom stream to a water content in the top stream is 0.05 to 2.4, thereby providing a high conversion rate and more cost-effectiveness, and enhancing the value of the industrial application.

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