摘要 |
<p>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.</p> |
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 |