中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

21 records (took 0.013 seconds)

    Preparation of 2,5-dibromoterephthalic acid
    3.
    发明授权
    Preparation of 2,5-dibromoterephthalic acid 失效
    2,5-二溴对苯二甲酸的制备

    公开(公告)号：US3894079A

    公开(公告)日：1975-07-08

    申请号：US31950072

    申请日：1972-12-29

    Applicant: STANDARD OIL CO

    Inventor： KNOBLOCH JAMES O

    IPC: C07C51/363 ,  C07C63/68 ,  C07C63/26 ,  C07C63/30

    CPC classification number: C07C63/68 ,  C07C51/363

    Abstract: 2,5-dibromoterephthalic acid, an intermediate used for flame retardant applications, is prepared from terephthalic acid, in a single step, by brominating terephthalic acid in chlorosulfonic acid or fluorosulfonic acid, containing sulfur trioxide and employing an iodine catalyst. The reaction is carried out under mild conditions. The products, 2,5-dibrometerephthalic acid, with lesser amounts of terephthalic acid, bromoterephthalic acid, tribromoterephthalic acid, and tetrabromoterephthalic acid, are recoverable either by filtration of the cooled bromination suspension or by distillation of the chlorosulfonic or fluorosulfonic acid solvent and the further hydrolysis of the brominated terephthalic acid product.

    Abstract translation: 用于阻燃应用的中间体是2,5-二溴对苯二甲酸，在一步中由对苯二甲酸通过在含有三氧化硫的氯磺酸或氟磺酸中溴化对苯二甲酸并使用碘催化剂制备。 反应在温和条件下进行。 产物2,5-二溴对苯二甲酸与较少量的对苯二甲酸，溴对苯二甲酸，三溴对苯二甲酸和四溴对苯二甲酸可以通过过滤冷却的溴化悬浮液或通过蒸馏氯磺酸或氟磺酸溶剂来回收， 溴化对苯二甲酸产物的水解。

    Purification of 2,6 and 2,7 naphthalene dicarboxylic acid
    6.
    发明授权
    Purification of 2,6 and 2,7 naphthalene dicarboxylic acid 失效
    2,6和2,7萘二羧酸的纯化

    公开(公告)号：US3916012A

    公开(公告)日：1975-10-28

    申请号：US13767771

    申请日：1971-04-26

    Applicant: STANDARD OIL CO

    Inventor： KNOBLOCH JAMES O

    IPC: C07C51/487 ,  C07C51/42 ,  C07C63/38

    CPC classification number: C07C51/487 ,  C07C63/38

    Abstract: Naphthalene dicarboxylic acids are purified by low concentration permanganate treatment at a pH upward from 10 and carbon treatment to remove at least manganous ions. The process is particularly useful for the purification of 2,6 and 2,7 naphthalene dicarboxylic acids that are to be converted to beta hydroxy alkyl esters from which corresponding film and fiber forming polyesters are made.

    Abstract translation: 萘二羧酸通过低浓度高锰酸盐处理，在10℃以上的pH下进行纯化，并进行碳处理以除去至少三价锰离子。 该方法特别可用于纯化待转化成β羟基烷基酯的2,6和2,7萘二羧酸，由此制备相应的成膜和成纤的聚酯。

    Isolation of tetrachloroterephthalic acid
    7.
    发明授权
    Isolation of tetrachloroterephthalic acid 失效
    四氯对苯二甲酸的分离

    公开(公告)号：US3873613A

    公开(公告)日：1975-03-25

    申请号：US39912573

    申请日：1973-09-20

    Applicant: STANDARD OIL CO

    Inventor： KNOBLOCH JAMES O ,  LATTA JAMES E

    IPC: C07C51/44 ,  C07C63/26 ,  C07C51/42

    CPC classification number: C07C51/44 ,  C07C63/68

    Abstract: Method of isolating relatively pure tetrachloroterephthalic acid from a spent oleum chlorination mother liquor which comprises the steps of eliminating substantially all sulfur trioxide and chlorosulfonic acid from said mother liquor and partitioning tetrachloroterephthalic acid from the mother liquor.

    Abstract translation: 从废柴油氯化母液中分离相对纯的四氯对苯二甲酸的方法，其包括从母液中除去基本上所有的三氧化硫和氯磺酸并从母液中分配四氯对苯二甲酸的步骤。

Patent Agency Ranking