Addition of mineral acids or salts thereof to a TMA production process
    1.
    发明授权
    Addition of mineral acids or salts thereof to a TMA production process 有权
    将无机酸或其盐加入到TMA生产过程中

    公开(公告)号:US06696604B2

    公开(公告)日:2004-02-24

    申请号:US10036551

    申请日:2002-01-03

    IPC分类号: C07C6500

    摘要: This invention is related to the production of trimellitic anhydride (TMA). More specifically, the invention is related to the addition of a mineral acid or salt thereof in the production process of trimellitic anhydride to reduce the viscosity of the bottoms fraction when TMA is purified by distillation and thus to prevent fouling/plugging. This permits the use of lower levels of TMA in the bottoms fraction and increases TMA recovery.

    摘要翻译: 本发明涉及偏苯三酸酐(TMA)的生产。 更具体地,本发明涉及在偏苯三酸酐的制备方法中添加无机酸或其盐以降低塔氏馏分在通过蒸馏纯化时的粘度,从而防止结垢/堵塞。 这允许在底部馏分中使用较低水平的TMA并增加TMA回收率。

    Dicyclohexadiene tetraacyl compounds
    3.
    发明授权
    Dicyclohexadiene tetraacyl compounds 失效
    二环己二烯四酰基化合物

    公开(公告)号:US4007214A

    公开(公告)日:1977-02-08

    申请号:US584638

    申请日:1975-06-06

    IPC分类号: C08G59/24 C08G63/12 C07C69/74

    CPC分类号: C08G59/24 C08G63/12

    摘要: This invention relates to dicyclohexadiene tetraacyl compounds. More particularly, this invention relates to dicyclohexadiene dianhydrides, dicyclohexadiene tetracarboxylic acid esters and dicyclohexadiene tetracarboxylic acids.

    摘要翻译: 本发明涉及二环己二烯四酰基化合物。 更具体地说,本发明涉及二环己二烯二酸酐,二环己二烯四羧酸酯和二环己二烯四羧酸。

    Preparation of poly(p-methylenebenzoate) from p-hydroxymethylbenzoic acid
    4.
    发明授权
    Preparation of poly(p-methylenebenzoate) from p-hydroxymethylbenzoic acid 失效
    从对羟甲基苯甲酸制备聚(对亚甲基苯甲酸酯)

    公开(公告)号:US4431798A

    公开(公告)日:1984-02-14

    申请号:US445546

    申请日:1982-11-30

    IPC分类号: C08G63/06

    CPC分类号: C08G63/065

    摘要: Disclosed is a process for the preparation of poly(p-methylenebenzoate) from p-hydroxymethylbenzoic acid containing no more than about 10% by weight terephthalic acid and no more than about 0.3 (wt) % total of 4-carboxybenzaldehyde and p-toluic acid.

    摘要翻译: 公开了一种从对羟基甲基苯甲酸制备聚(对亚甲基苯甲酸酯)的方法,该对羟基甲基苯甲酸含有不超过约10重量%的对苯二甲酸和不超过约0.3重量%的4-羧基苯甲醛和对甲苯甲酸 。

    Monomers for poly(methylenebenzoate) polymers from toluic acid compounds
    5.
    发明授权
    Monomers for poly(methylenebenzoate) polymers from toluic acid compounds 失效
    来自甲苯酸化合物的聚(亚甲基苯甲酸酯)聚合物的单体

    公开(公告)号:US4182847A

    公开(公告)日:1980-01-08

    申请号:US915826

    申请日:1978-06-16

    IPC分类号: C08G63/06 C08G63/02

    CPC分类号: C08G63/065

    摘要: Highly-purified monomers for poly(p-methylenebenzoate) polymers and poly(m-methylenebenzoate) polymers are prepared by purifying acetoxylated hydroxymethylbenzoic acid compounds derived by side-chain acetoxylation of toluic acid compounds. The purification process can be by recrystallation or by fractional distillation.

    摘要翻译: 通过纯化通过甲苯甲酸化合物的侧链乙酰氧基化衍生的乙酰氧基化羟甲基苯甲酸化合物制备聚(对亚甲基苯甲酸)聚合物和聚(对亚甲基苯甲酸酯)聚合物的高纯化单体。 纯化过程可以通过重结晶或分馏。

    Process for purification of crude p-hydroxymethylbenzoic acid
    6.
    发明授权
    Process for purification of crude p-hydroxymethylbenzoic acid 失效
    粗对羟基甲基苯甲酸的纯化方法

    公开(公告)号:US4721808A

    公开(公告)日:1988-01-26

    申请号:US40887

    申请日:1987-04-21

    IPC分类号: C07C51/487 C07C65/00

    CPC分类号: C07C51/487

    摘要: A crude p-hydroxymethylbenzoic acid compound containing 4-carboxybenzaldehyde is purified and decolorized by hydrogenation in the presence of a platinum on carbon catalyst. 4-carboxybenzaldehyde is hydrogenated to p-hydroxymethylbenzoic acid. Toluic acid is not a product of the hydrogenation process.

    摘要翻译: 将含有4-羧基苯甲醛的粗对羟基甲基苯甲酸化合物在碳载铂催化剂存在下,通过氢化得到纯化和脱色。 将4-羧基苯甲醛氢化成对羟甲基苯甲酸。 甲酸不是氢化过程的产物。

    Process for preparing palladium on carbon catalysts for purification of
crude terephthalic acid
    7.
    发明授权
    Process for preparing palladium on carbon catalysts for purification of crude terephthalic acid 失效
    制备用于纯对苯二甲酸的钯碳催化剂的方法

    公开(公告)号:US4476242A

    公开(公告)日:1984-10-09

    申请号:US507707

    申请日:1983-06-23

    摘要: A catalyst, a process for preparing said catalyst, and a process for producing purified terephthalic acid, wherein 4-carboxybenzaldehyde is reduced to very low levels, wherein said catalyst is prepared by contacting a solution of a suitable palladium salt in an organic solvent with a suitable activated carbon support, wherein said palladium salt is reduced to palladium metal crystallites by said activated carbon support. Purified terephthalic acid is prepared by hydrogenating crude terephthalic acid in the presence of said catalyst.

    摘要翻译: 一种催化剂,一种制备所述催化剂的方法和一种生产纯化对苯二甲酸的方法,其中4-羧基苯甲醛被还原成非常低的水平,其中所述催化剂是通过使合适的钯盐在有机溶剂中的溶液与 合适的活性炭载体,其中所述钯盐由所述活性炭载体还原成钯金属微晶。 纯化的对苯二甲酸通过在所述催化剂存在下氢化粗对苯二甲酸来制备。

    Catalyst and process for purification of crude terephthalic acid
    10.
    发明授权
    Catalyst and process for purification of crude terephthalic acid 失效
    用于纯化粗对苯二甲酸的催化剂和方法

    公开(公告)号:US4791226A

    公开(公告)日:1988-12-13

    申请号:US587947

    申请日:1984-03-09

    摘要: A catalyst, a process for preparing said catalyst, and a process for producing purified terephthalic acid, wherein 4-carboxybenzaldehyde is reduced to very low levels, wherein said catalyst is prepared by contacting a solution of a suitable palladium salt in an organic solvent with a suitable activated carbon support, wherein said palladium salt is reduced to palladium metal crystallites by said activated carbon support. Purified terephthalic acid is prepared by hydrogenating crude terephthalic acid in the presence of said catalyst.

    摘要翻译: 一种催化剂,一种制备所述催化剂的方法和一种生产纯化对苯二甲酸的方法,其中4-羧基苯甲醛被还原成非常低的水平,其中所述催化剂是通过使合适的钯盐在有机溶剂中的溶液与 合适的活性炭载体,其中所述钯盐由所述活性炭载体还原成钯金属微晶。 纯化的对苯二甲酸通过在所述催化剂存在下氢化粗对苯二甲酸来制备。