发明名称 |
PROCESS FOR PREPARATION OF AROMATIC ISOCYANATES |
摘要 |
<p>A PROCESS FOR PREPARATION OF AROMATIC ISOCYANATES A process is described for preparing aromatic isocyanates by contacting an aromatic carbamate of the formula R(NHCO2R')n at 150-350.degree.C under reduced pressure with one or more metal or metal compound catalysts dissolved in an inert solvent. In the formula R is a divalent aromatic, R' is a monovalent aliphatic, alicyclic or aromatic with at most 8 carbon atoms and n is 1 or 2. The metal is dissolved in a concentration of at least 1/1000% by weight of the solvent. The vapors of the resulting aromatic isocyanate and alcohol or phenol are fractionally condensed under reduced pressure and the aromatic isocyanate is separately collected.</p> |
申请公布号 |
CA1082728(A) |
申请公布日期 |
1980.07.29 |
申请号 |
CA19760258489 |
申请日期 |
1976.08.05 |
申请人 |
MITSUI TOATSU CHEMICALS, INCORPORATED |
发明人 |
TSUMURA, RYUICHIROU;TAKAKI, USAJI;ABE, TAKESHI |
分类号 |
C07B61/00;B01J31/00;B01J31/02;B01J31/16;C07C;C07C67/00;C07C241/00;C07C263/04;C07C265/00;C07C265/12;C07C265/14;C08G18/76;(IPC1-7):07C119/048 |
主分类号 |
C07B61/00 |
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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