Process for the production of 2,3,5-trimethylhydroquinone diesters
    34.
    发明授权
    Process for the production of 2,3,5-trimethylhydroquinone diesters 失效
    制备2,3,5-三甲基氢醌二酯的方法

    公开(公告)号:US06316661B1

    公开(公告)日:2001-11-13

    申请号:US09493065

    申请日:2000-01-28

    IPC分类号: C07C6900

    摘要: A process for the production of 2,3,5-trimethylhydroquinone diesters by aromatization of 2,6,6-trimethyl-2-cyclohexene-1,4-dione (4-oxoisophorone, ketoisophorone, KIP) with an acylating agent and an acidic soluble or insoluble catalyst, which process may be operated alternatively continuously or discontinuously. The process includes the following steps: a) a carboxylic anhydride having a C1 to C4 alkyl residue is used as the acylating agent, b) after the reaction, a proportion of the resultant carboxylic acid is optionally removed by distillation, c) the reaction solution is cooled, d) the product which has crystallized out is separated and washed, and e) the filtrate is returned to step a).

    摘要翻译: 通过2,6,6-三甲基-2-环己烯-1,4-二酮(4-氧异佛尔酮,酮异佛尔酮,KIP)与酰化剂和酸性化合物的芳构化生产2,3,5-三甲基氢醌二酯的方法 可溶或不溶的催化剂,该方法可以交替连续或不连续地操作。 该方法包括以下步骤:a)具有C1至C4烷基残基的羧酸酐用作酰化剂,b)反应后,任选地通过蒸馏除去所得羧酸的一部分,c)反应溶液 被冷却,d)结晶出来的产物被分离和洗涤,e)将滤液返回到步骤a)。

    Thermoelectric elements, method for manufacturing same, and use of same
    39.
    发明申请
    Thermoelectric elements, method for manufacturing same, and use of same 有权
    热电元件及其制造方法及其使用

    公开(公告)号:US20080121263A1

    公开(公告)日:2008-05-29

    申请号:US11984703

    申请日:2007-11-21

    摘要: There are described thermoelectric elements that are manufactured by using a porous matrix or a porous substrate. The matrix consists of an electrically insulating material having sufficient thermal and chemical resistance as well as the lowest possible thermal conductivity, and is provided in predetermined regions with different thermoelectric materials, so that continuous conductors are formed in the matrix. These are electrically connected to one another to form thermocouples, which in turn are electrically interconnected with one another to form the thermoelectric element.

    摘要翻译: 描述了通过使用多孔基体或多孔基底制造的热电元件。 该矩阵由具有足够的耐热和耐化学性以及尽可能低的导热性的电绝缘材料组成,并且在具有不同热电材料的预定区域中提供,从而在基体中形成连续的导体。 它们彼此电连接以形成热电偶,热电偶又互相电互连以形成热电元件。