发明名称 |
Process for the preparation of 2-hydroxybenzonitrile |
摘要 |
<p>Prepn. of 2-hydroxybenzonitrile (I) comprises gas phase dehydration of 2-hydroxybenzamide (II) using heterogeneous catalysis. The catalyst is pref. SiO2 gel treated with H3PO4 and is dried before use. Reaction is carried out at 200-400 degrees C and reduced pressure (esp. 20-40 mbar). The LHSV is 0.05-1 (esp. 0.1-0.5) hr<-1>. Pure (I) is recovered from the crude reaction mixt. by distn.</p> |
申请公布号 |
EP0749956(B1) |
申请公布日期 |
1999.06.23 |
申请号 |
EP19960106334 |
申请日期 |
1996.04.23 |
申请人 |
HUELS AKTIENGESELLSCHAFT |
发明人 |
KLEEMISS, WOLFGANG, DR. |
分类号 |
B01J27/16;C07B61/00;C07C253/20;C07C255/53;(IPC1-7):C07C255/53 |
主分类号 |
B01J27/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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