Method for producing dihydroxy compounds

    公开(公告)号:US10960371B2

    公开(公告)日:2021-03-30

    申请号:US16589977

    申请日:2019-10-01

    Abstract: The disclosure is directed to the use of an upflow reactor for producing a dihydroxy compound, to a method for producing a dihydroxy compound, and to a method for manufacturing polycarbonate. The upflow reactor for producing a dihydroxy compound of the disclosure comprises: a vessel; a catalyst bed disposed in said vessel; a distributor in fluid communication with an inlet through which reactants are introduced to said distributor, said distributor being disposed at a lower end of said vessel and comprising distributor perforation(s) disposed in said distributor, at least part of which distributor perforations are in a direction facing away from said catalyst bed; and a collector through which said product dihydroxy compound is removed, said collector being disposed at an upper end of said vessel.

    POLYCARBONATE COMPOSITIONS HAVING ENHANCED OPTICAL PROPERTIES, METHODS OF MAKING AND ARTICLES COMPRISING THE POLYCARBONATE COMPOSITIONS
    4.
    发明申请
    POLYCARBONATE COMPOSITIONS HAVING ENHANCED OPTICAL PROPERTIES, METHODS OF MAKING AND ARTICLES COMPRISING THE POLYCARBONATE COMPOSITIONS 有权
    具有增强光学性质的聚碳酸酯组合物,制备方法和包含聚碳酸酯组合物的制品

    公开(公告)号:US20160289377A1

    公开(公告)日:2016-10-06

    申请号:US15055916

    申请日:2016-02-29

    Abstract: In some embodiments, a method of making a polycarbonate composition comprises: polymerizing by an interfacial polymerization, reactants comprising a starting material comprising a bisphenol-A to form a bisphenol-A polycarbonate, wherein the bisphenol-A has a purity of greater than or equal to 99.65 wt % and a sulfur content of less than or equal to 2 ppm. The polycarbonate composition has a free hydroxyl content of less than or equal to 150 ppm, and wherein a molded article of the polycarbonate composition has transmission level greater than or equal to 90.0% at 2.5 mm thickness as measured by ASTM D1003-00 and a yellow index (YI) less than or equal to 1.5 as measured by ASTM D1925.

    Abstract translation: 在一些实施方案中,制备聚碳酸酯组合物的方法包括:通过界面聚合聚合反应物,其包含包含双酚A的原料以形成双酚A聚碳酸酯,其中所述双酚-A具有大于或等于 至99.65重量%,硫含量小于或等于2ppm。 该聚碳酸酯组合物具有小于或等于150ppm的游离羟基含量,并且其中聚碳酸酯组合物的模塑制品具有通过ASTM D1003-00测量的2.5mm厚度的透射率大于或等于90.0%,并且黄色 指数(YI)小于或等于1.5,由ASTM D1925测量。

    Method of purifying acetone
    7.
    发明授权

    公开(公告)号:US10745337B2

    公开(公告)日:2020-08-18

    申请号:US16652544

    申请日:2018-10-03

    Abstract: In an embodiment a method of purifying acetone, comprises directing a feed stream comprising greater than or equal to 97 wt % of acetone and 100 to 1,000 ppm of methanol to a separation column, both based on a total weight of the feed stream; separating the feed stream in the separation column that is operating at a pressure greater than or equal to 1 bar into an overhead stream and a purified acetone stream comprising less than or equal to 50 ppm of methanol based on a total weight of the purified acetone stream; and directing at least 80 wt % of the overhead stream into the separation column as a reconstituted stream and purging 1 to 20 wt % of the overhead stream as a purge stream.

    METHOD OF PURIFYING ACETONE
    8.
    发明申请

    公开(公告)号:US20200231526A1

    公开(公告)日:2020-07-23

    申请号:US16652544

    申请日:2018-10-03

    Abstract: In an embodiment a method of purifying acetone, comprises directing a feed stream comprising greater than or equal to 97 wt % of acetone and 100 to 1,000 ppm of methanol to a separation column, both based on a total weight of the feed stream; separating the feed stream in the separation column that is operating at a pressure greater than or equal to 1 bar into an overhead stream and a purified acetone stream comprising less than or equal to 50 ppm of methanol based on a total weight of the purified acetone stream; and directing at least 80 wt % of the overhead stream into the separation column as a reconstituted stream and purging 1 to 20 wt % of the overhead stream as a purge stream.

    METHOD FOR PRODUCING DIHYDROXY COMPOUNDS
    9.
    发明申请

    公开(公告)号:US20200164328A1

    公开(公告)日:2020-05-28

    申请号:US16589977

    申请日:2019-10-01

    Abstract: The disclosure is directed to the use of an upflow reactor for producing a dihydroxy compound, to a method for producing a dihydroxy compound, and to a method for manufacturing polycarbonate. The upflow reactor for producing a dihydroxy compound of the disclosure comprises: a vessel; a catalyst bed disposed in said vessel; a distributor in fluid communication with an inlet through which reactants are introduced to said distributor, said distributor being disposed at a lower end of said vessel and comprising distributor perforation(s) disposed in said distributor, at least part of which distributor perforations are in a direction facing away from said catalyst bed; and a collector through which said product dihydroxy compound is removed, said collector being disposed at an upper end of said vessel.

    MANUFACTURE OF BISPHENOL A
    10.
    发明申请

    公开(公告)号:US20190308921A1

    公开(公告)日:2019-10-10

    申请号:US16317054

    申请日:2017-07-10

    Abstract: The invention is directed to a method for the manufacture of bisphenol A, to the use of acid in a method for crystallisation of bisphenol A/phenol adduct, and to bisphenol A/phenol adduct crystals. The method for the manufacture of bisphenol A comprises: a) reacting phenol and acetone in the presence of an acidic catalyst to form a product mixture comprising bisphenol A; and b) crystallising a bisphenol A/phenol adduct from said product mixture, wherein said crystallisation is carried out in the presence of an acid, wherein the total amount of acid present during the crystallisation step is 5% or less by total weight of the reaction product.

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