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公开(公告)号：US20220363823A1
公开(公告)日：2022-11-17
申请号：US17620360
申请日：2020-07-02
Inventor： Xiaoshuang FENG , Naganatha PATIL , Senthil BOOPATHI , Yves GNANOU , Nikolaos HADJICHRISTIDIS
Abstract: Methods of recovering and/or reusing activators and/or initiators following polycarbonate synthesis may include: contacting an amine compound with a carboxylic acid compound to form a first ammonium salt including a first ammonium cation associated with a carboxylate group; mixing the first ammonium salt with a reaction solution to obtain a first solution comprising a protonated polycarbonate, an activator adduct, and a second ammonium salt in which the second ammonium cation is associated with the carboxylate group from the first ammonium salt; contacting the first solution to precipitate the polycarbonate out of solution; separating the activator adduct from the precipitated polycarbonate and the second ammonium salt to obtain a second solution; separating the precipitated polycarbonate from the second ammonium salt to recover the second ammonium salt; and separating the activator adduct from the second solution to recover an activator capable of being reused for synthesizing additional polycarbonates.
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公开(公告)号：US20210070932A1
公开(公告)日：2021-03-11
申请号：US17051292
申请日：2019-05-17
Inventor： Xiaoshuang FENG , Naganatha PATIL , Caroline LUCIANI , Yves GNANOU , Nikos HADJICHRISTIDIS
Abstract: Supported onium salts used as initiators for the synthesis of polycarbonates by copolymerization of carbon dioxide with epoxides are described. Embodiments of the present disclosure describe initiators comprising an insoluble portion including an onium cation attached to an insoluble support; and an anion, wherein the anion is a counter-ion to the onium cation. Embodiments further describe methods of making polycarbonates using the initiator, methods of making initiators, and the like.
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