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    METHOD FOR PREPARING 2,3-DICHLOROPYRIDINE
    1.
    发明公开
    METHOD FOR PREPARING 2,3-DICHLOROPYRIDINE 有权
    制备2,3-二氯吡啶的方法

    公开(公告)号：EP2687510A1

    公开(公告)日：2014-01-22

    申请号：EP11861242.3

    申请日：2011-06-07

    申请人： Lianhe Chemical Technology Co., Ltd. ,  Jiangsu Lianhe Chemical Technology Co., Ltd

    发明人： WANG, Ping ,  FAN, Xiaobin ,  ZHANG, Juntao ,  YE, Fangsheng

    IPC分类号： C07D213/61

    CPC分类号： C07D213/61

    摘要： Disclosed is a method for preparing 2,3-dichloropyridine, which comprises the following steps: (1). chlorination: reacting 2,6-dichloropyridine with chlorine gas in the presence of a catalyst to obtain 2,3,6-trichloropyridine; (2). hydrogenation: hydrogenating 2,3,6-trichloropyridine in an organic solvent in the presence of an acid-binding agent and a catalyst; (3). post-processing: cooling the aforementioned reaction mixture, adding water to dissolve the acid-binding agent hydrochloride, standing to separate the water layer after filtering, extracting the organic solvent layer with a hydrous acid at least three times, combining the hydrous acid layer, adding water to dilute to separate the solid, filtering and drying it to obtain 2,3-dichloropyridine.

    摘要翻译： 公开了一种制备2,3-二氯吡啶的方法，包括以下步骤：（1）。 氯化：2,6-二氯吡啶与氯气在催化剂存在下反应得到2,3,6-三氯吡啶; （2）。 氢化：在酸结合剂和催化剂存在下，在有机溶剂中氢化2,3,6-三氯吡啶; （3）。 后处理：冷却上述反应混合物，加水使酸结合剂盐酸盐溶解，过滤分离水层，用含水酸萃取有机溶剂层至少3次，合并含水酸层， 加水稀释分离固体，过滤并干燥得到2,3-二氯吡啶。

    A METHOD FOR PREPARING 2,5-DIMETHYLPHENYLACETIC ACID
    2.
    发明公开
    A METHOD FOR PREPARING 2,5-DIMETHYLPHENYLACETIC ACID 有权
    VERFAHREN ZUR HERSTELLUNG VON 2,5-DIMETHYLPHENYL-ESSIGSÄURE

    公开(公告)号：EP2562152A1

    公开(公告)日：2013-02-27

    申请号：EP11860849.6

    申请日：2011-06-07

    申请人： Lianhe Chemical Technology Co., Ltd. ,  Jiangsu Lianhe Chemical Technology Co., Ltd

    发明人： WANG, Ping ,  FAN, Xiaobin ,  LIN, Xingjun ,  HE, Zhaohui

    IPC分类号： C07C51/10 ,  C07C57/30

    CPC分类号： C07C51/10 ,  C07C17/32 ,  Y02P20/542 ,  C07C57/30 ,  C07C22/04

    摘要： Provided is a method for preparing 2,5-dimethylphenylacetic acid, wherein p-xylene is mixed with paraformaldehyde and concentrated hydrochloric acid in a solvent of ion liquid to obtain 2,5-dimethyl benzyl chloride by the chloromethylation reaction. Then, 2,5-dimethyl benzyl chloride is introduced into a reactor with an acid binding agent and a solvent, the carbonylation and hydrolysis reaction is conducted in the presence of a catalyst to obtain 2,5-dimethylphenylacetic acid. The present process has new route, less synthesis steps, simple operation, lower cost, increased yield, and is friendly to the environment. Therefore, the method is suitable for industrial production.

    摘要翻译： 提供了制备2,5-二甲基苯乙酸的方法，其中对二甲苯与多聚甲醛和浓盐酸在离子液体的溶剂中混合，通过氯甲基化反应得到2,5-二甲基苄基氯。 然后，用酸结合剂和溶剂将2,5-二甲基苄基氯引入反应器中，羰基化和水解反应在催化剂存在下进行，得到2,5-二甲基苯基乙酸。 本工艺具有新途径，综合步骤少，操作简单，成本低廉，产量增加，环境友好。 因此，该方法适用于工业生产。