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公开(公告)号：US11976181B2
公开(公告)日：2024-05-07
申请号：US17568947
申请日：2022-01-05
Applicant: Zeon Chemicals L.P.
Inventor： Soobum Choi , Lawrence J. Justice , Mahesh Datla
CPC classification number: C08L15/005 , B01J23/44 , B01J38/74 , B01J47/02 , C08C19/02
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.
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公开(公告)号：US20220220289A1
公开(公告)日：2022-07-14
申请号：US17568947
申请日：2022-01-05
Applicant: Zeon Chemicals L.P.
Inventor： Soobum Choi , Lawrence J. Justice , Mahesh Datla
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.
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