Dehydration catalyst and process for producing a monoalkylether of a
dihydric phenolic compound using same
    2.
    发明授权
    Dehydration catalyst and process for producing a monoalkylether of a dihydric phenolic compound using same 失效
    脱水催化剂和使用其制备二羟基酚类化合物的单烷基醚的方法

    公开(公告)号:US5977416A

    公开(公告)日:1999-11-02

    申请号:US58327

    申请日:1998-04-09

    摘要: A dehydration catalyst useful for producing a monoalkylether of dihydric phenolic compound by a dehydration reaction of a dihydric phenolic compound with a lower alkyl alcohol with a high conversion at a high selectivity, comprises at least one inorganic substance of the empirical formula (I):Al.sub.a P.sub.b Ti.sub.c Si.sub.d X.sub.e O.sub.f (I)wherein X represents a member selected from the group consisting of (1) an antimony and/or a bismuth atom, and (2) a sulfur atom, a, b, c, d, e and f respectively represent the numbers of Al, P, Ti, Si, X and 0 atoms, the atomic ratio a:b is 1:1.0 to 1.9, the atomic ratio a:c is 1:0.05 to 0.5, the atomic ratio a:d is 1:0.05 to 0.2, the atomic ratio a:e is 1:0.01 to 0.3 when X represents antimony and/or bismuth atom and 1:0.004 to 0.015 when X represents a sulfur atom, and the atomic ratio a:f is 1:4.1 to 8.4.

    摘要翻译: 通过二羟基酚类化合物与高级选择性的高转化率的低级烷基醇的脱水反应生产二羟基酚类化合物的单烷基醚的脱水催化剂包含至少一种经验式(I)的无机物质:Ala (I)其中X表示选自(1)锑和/或铋原子的成员,(2)硫原子,a,b,c,d,e和f 分别表示Al,P,Ti,Si,X和0原子的数量,原子比a:b为1:1.0〜1.9,原子比a:c为1:0.05〜0.5,原子比a:d 为1:0.05〜0.2,当X表示锑和/或铋原子时,原子比a:e为1:0.01〜0.3,当X表示硫原子时为1:0.004〜0.015,原子比a:f为1 :4.1〜8.4。

    Apparatus and method for refining alkaline solution
    4.
    发明授权
    Apparatus and method for refining alkaline solution 有权
    碱性溶液精制装置及方法

    公开(公告)号:US06890417B2

    公开(公告)日:2005-05-10

    申请号:US10125035

    申请日:2002-04-17

    CPC分类号: C25B1/16 C23G1/36

    摘要: An electrolytic bath is divided into an anodic chamber and a cathodic chamber by a cation-exchange membrane. A base alkaline solution of high impurity concentration is supplied into the anodic chamber from a tank of a base material as well as a circulating anolyte overflowed from the anodic chamber is supplied and circulated from an anode circulating tank, and NaOH solution of low impurity concentration is supplied and circulated into the cathodic chamber through a tank of a refined solution. The concentration of the circulating anolyte is detected, and based on this detected value the supplying amount of the base NaOH solution is controlled and electrolysis is performed. Thus, the concentration of NaOH solution in the anodic chamber is kept stable, and the refined NaOH solution of low impurity concentration can be obtained in the cathodic chamber.

    摘要翻译: 电解槽通过阳离子交换膜分为阳极室和阴极室。 将高杂质浓度的碱性碱溶液从基材槽供入阳极室,从阳极室溢出的循环阳极液从阳极循环罐供给并循环,低杂质浓度的NaOH溶液为 通过精炼溶液的罐供给并循环到阴极室中。 检测循环阳极电解液的浓度,根据该检测值,控制碱NaOH溶液的供给量,进行电解。 因此,阳极室中的NaOH溶液的浓度保持稳定,并且可以在阴极室中获得低杂质浓度的精制NaOH溶液。