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    Process for preparing a bisphenol
    4.
    发明公开
    Process for preparing a bisphenol 失效
    韦尔法罕zur Herstellung eines双酚。

    公开(公告)号：EP0559372A1

    公开(公告)日：1993-09-08

    申请号：EP93301389.8

    申请日：1993-02-24

    申请人： THE DOW CHEMICAL COMPANY (a Delaware corporation)

    发明人： Patrascu, Emil ,  Tank, Dieter ,  Gressmann, Jochen ,  Frey, Johann-Wilhelm ,  Wallbaum, Ulrich

    IPC分类号： C07C37/20 ,  C07C37/82 ,  C07C39/16

    CPC分类号： C07C37/20 ,  C07C37/82 ,  Y02P20/52 ,  C07C39/16 ,  C07C39/04

    摘要： Bisphenols are prepared by

    a) reacting a phenolic compound with a carbonyl compound in a reaction mixture, containing the carbonyl compound, a stoichiometric excess of the phenolic compound and a catalyst, to produce a product mixture containing a bisphenol,
    b) separating bisphenol from the product mixture to leave a mother liquor and
    c) recycling at least a portion of the mother liquor to the reaction mixture.
    At least a portion of the phenolic compound is contacted with a strongly acidic cation exchange resin and a strongly basic anion exchange resin before the phenolic compound is used in the reaction step a) and/or at least a portion of the product mixture and/or at least a portion or the mother liquor is contacted with a strongly acidic cation exchange resin and a strongly basic anion exchange resin before mother liquor is recycled to the reaction mixture.

    摘要翻译： 双酚通过以下方法制备：a）在含有羰基化合物，化学计量过量的酚类化合物和催化剂的反应混合物中使酚类化合物与羰基化合物反应，制备含双酚的产物混合物，b）将双酚与 产品混合物以留下母液并且c）将至少一部分母液再循环到反应混合物中。 在酚类化合物在反应步骤a）和/或至少一部分产物混合物中使用之前，至少部分酚类化合物与强酸性阳离子交换树脂和强碱性阴离子交换树脂接触，和/或 在将母液再循环到反应混合物中之前，至少一部分或母液与强酸性阳离子交换树脂和强碱性阴离子交换树脂接触。

    A foaming system for rigid urethane and isoyanurate foams
    5.
    发明公开
    A foaming system for rigid urethane and isoyanurate foams 失效
    食品和饮料。

    公开(公告)号：EP0398147A2

    公开(公告)日：1990-11-22

    申请号：EP90108748.6

    申请日：1990-05-09

    申请人： THE DOW CHEMICAL COMPANY (a Delaware corporation)

    发明人： Smits, Guido Freddy ,  Grünbauer, Henri Jacobus Marie

    IPC分类号： C08J9/14

    CPC分类号： C08J9/143 ,  C08J2375/04

    摘要： This invention relates to rigid closed-celled polyisocyanate-based foams exhibiting improved dimensional stability and a process for their preparation. In particular, it relates to resulting foams containing within their cells, a gas mixture comprising from 15 to 70 mole percent carbon dioxide and from 30 to 85 mole percent of a halocarbon mixture.
    The halocarbon mixture itself, comprises (a) from 40 to 95 mole percent based on moles of (a) and (b) present of a halocarbon compound having a boiling point of at least 283°K, and (b) from 50 to 60 mole percent of a halocarbon compound having a boiling point equal to or less than 266°K. Preferred halocarbons for component (a) and (b) are ethane halocarbons especially fluorodi­chloroethane or dichlorotrifluoroethane and chlorodi­fluoroethane, respectively.

    摘要翻译： 本发明涉及显示改进的尺寸稳定性的刚性闭孔聚异氰酸酯基泡沫体及其制备方法。 特别地，其涉及在其细胞内含有的包含15-70摩尔％二氧化碳和30至85摩尔％卤代烃混合物的气体混合物的所得泡沫。 卤代烃混合物本身包含（a）基于（a）和（b）存在的沸点为至少283℃的卤代烃化合物的摩尔数为40至95摩尔％，和（b）50至60 沸点等于或小于266°K的卤代烃化合物的摩尔百分数。组分（a）和（b）的优选卤代烃分别是乙烷卤代烃，特别是氟代二氯乙烷或二氯三氟乙烷和氯二氟乙烷。

    Wastewater disinfection with a combination of biocides
    10.
    发明公开
    Wastewater disinfection with a combination of biocides 失效
    Abwasserentkeimung mittels einer Kombination von Bioziden。

    公开(公告)号：EP0460261A1

    公开(公告)日：1991-12-11

    申请号：EP90110728.4

    申请日：1990-06-06

    申请人： THE DOW CHEMICAL COMPANY (a Delaware corporation)

    发明人： Karbowski, Robert J.

    IPC分类号： C02F1/76 ,  C02F1/50

    CPC分类号： C02F1/76 ,  C02F1/50 ,  C02F1/766

    摘要： Wastewater is effectively disinfected while reducing both chlorine consumption and more particularly the levels of residual chlorine discharged from the wastewater treatment plant. The wastewater is first contacted with a sufficient amount of chlorine to satisfy the chlorine demand and to obtain as low a residual level of chlorine as possible. After the chlorine demand has been satisfied, the wastewater is disinfected with an effective amount of 2,2-dibromo-3-nitrilopropionmaide.

    摘要翻译： 废水被有效消毒，同时减少氯消耗，特别是废水处理厂排放的残留氯水平。 首先将废水与足够量的氯接触以满足氯的需求，并且尽可能地获得低的氯残留量。 在满足氯需求后，用有效量的2,2-二溴-3-硝基丙酰胺消毒废水。