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    METHOD FOR PRODUCING 2-BROMO-4,5-DIALKOXY BENZOIC ACID
    5.
    发明公开
    METHOD FOR PRODUCING 2-BROMO-4,5-DIALKOXY BENZOIC ACID 有权
    VERFAHREN ZUR HERSTELLUNG VON 2-BROM-4,5-DIALKOXY-BENZOESURE

    公开(公告)号：EP2650277A1

    公开(公告)日：2013-10-16

    申请号：EP11847027.7

    申请日：2011-12-06

    申请人： Zeria Pharmaceutical Co., Ltd.

    发明人： NAKAO, Ryu

    IPC分类号： C07C51/363 ,  C07C51/367 ,  C07C65/21 ,  C07B61/00

    CPC分类号： C07C51/363 ,  C07C51/367 ,  C07C65/21

    摘要： Provided is a method for effectively producing a 4,5-dialkoxy-2-hydroxybenzoic acid from an inexpensive raw material.
    A method for producing a 2-bromo-4,5-dialkoxybenzoic acid represented by the following formula (2):
    (wherein each of R 1 and R 2 represents a lower alkyl group), the method including causing a 3,4-dialkoxybenzoic acid represented by the following formula (1):
    (wherein R 1 and R 2 have the same meanings as defined above) to react with bromine in concentrated hydrochloric acid.

    摘要翻译： 提供了从廉价的原料有效地制备4,5-二烷氧基-2-羟基苯甲酸的方法。 由下式（2）表示的2-溴-4,5-二烷氧基苯甲酸的制造方法（其中，R 1和R 2各自表示低级烷基），该方法包括使3,4-二烷氧基苯甲酸 由下式（1）表示的酸（其中R 1和R 2具有与上述相同的含义）与溴在浓盐酸中反应。

    PROCESS FOR PREPARING MONOCHLOROACETIC ACID
    7.
    发明授权
    PROCESS FOR PREPARING MONOCHLOROACETIC ACID 有权
    用于生产乙酸的一氯胺

    公开(公告)号：EP1451136B1

    公开(公告)日：2010-06-02

    申请号：EP02804179.6

    申请日：2002-11-19

    申请人： Akzo Nobel N.V.

    发明人： KOOIJMAN, Cornelis ,  AALDERING, Jacobus, Theodorus, Jozef

    IPC分类号： C07C51/363 ,  C07C51/377 ,  C07C51/487 ,  C07C51/42 ,  C07C53/16 ,  C07C51/285

    CPC分类号： C07C51/487 ,  C07C53/16

    摘要： The invention relates to a process for preparing monochloroacetic acid (MCA) comprising a chlorination step and a hydrogenation step and is characterized in that said process comprises the removal of aldehydes from a process stream by peroxidation using a peroxycarboxylic acid. A preferred peroxycarboxylic acid comprises peracetic acid. Preferably, the process is carried out at a temperature of 60-100 °C, most preferably at atmospheric pressure. Preferably, an about equimolar amount of peroxycarboxylic acid is used relative to the molar amount of aldehydes present in the process stream. A practical choice for the process stream is the acetic acid recycle stream. The invention process provides a clear and colourless MCA end product.

    CONCURRENT SULFUR DIOXIDE OXIDATION PROCESS AND ITS USE IN MANUFACTURE OF TETRABROMOPHTHALIC ANHYDRIDE
    8.
    发明公开
    CONCURRENT SULFUR DIOXIDE OXIDATION PROCESS AND ITS USE IN MANUFACTURE OF TETRABROMOPHTHALIC ANHYDRIDE 审中-公开
    操作法，硫及其用途在tetrabromophthalicanhydride生产同时氧化

    公开(公告)号：EP1747171A1

    公开(公告)日：2007-01-31

    申请号：EP04750691.0

    申请日：2004-04-27

    申请人： ALBEMARLE CORPORATION

    发明人： HARROD, William, B. ,  HALL, Tyson, J. ,  KNIGHT, Christopher, S. ,  PRINDLE, John, C., Jr. ,  ARMSTRONG, David, M.

    IPC分类号： C01B17/76 ,  C07C51/363 ,  C07C63/68 ,  C01B17/765

    CPC分类号： C01B17/79 ,  C01B17/76 ,  C07C51/567 ,  C07C63/68

    摘要： Sulfur trioxide is formed by a process wherein a first gaseous stream comprised of S02, SO3, and oxygen and/or air is passed into a bed of a vanadium-containing catalyst that oxidizes S02 to S03and that releases therefrom a second gaseous stream comprised of sulfur trioxide. This process is improved in a first case by providing vaporized sulfur in the first gaseous stream so that the resultant mixture passes through a substantial portion of the catalyst bed, and maintaining the catalyst bed at one or more temperatures in the range of about 450 to about 700 °C. The sulfur is oxidized to S02. As a result, the second gaseous stream released from the downstream end portion of the catalyst bed has an enriched content of sulfur trioxide, which can be used for production of compounds such as tetrabromophthalic anhydride. In a second case, a stream of sulfur dioxide is generated from sulfur and an oxidant, and this stream is introduced into the first gaseous stream referred to above. In this second case, the feed of sulfur dioxide replaces the vaporized sulfur used in the first case. As in the first case, an enriched stream of sulfur trioxide is released from the downstream end of the catalyst and can be used for producing compounds such as tetrabromophthalic anhydride.