| 发明名称 |
PROCESS FOR THE PREPARATION OF PURE PROPANEPHOSPHONIC ANHYDRIDE |
| 摘要 |
Process for the preparation of pure propanephosphonic anhydride, which comprises distilling crude, impure propanephosphonic anhydride having an average degree of polymerization of 20 to 200 and containing less than 0.5% by weight of water by heating to 230 to 300.degree.C under a pressure of 0.1 to 100 mbar, pure propanephosphonic anhydride having an average decree of polymerization of 20 to 60 being obtained.
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| 申请公布号 |
CA2075558(C) |
申请公布日期 |
2003.03.18 |
| 申请号 |
CA19922075558 |
申请日期 |
1992.08.07 |
| 申请人 |
HOECHST AKTIENGESELLSCHAFT |
发明人 |
ROSCHER, GUNTER;KLEINER, HANS-JERG;BERGER, HARALD;SCHMIDT, MANFRED;UHMANN, RAINER;BOTTGER, DIRK |
| 分类号 |
C07F9/48;C07F9/38;C08G79/02;C08G79/04;(IPC1-7):C07F9/38 |
主分类号 |
C07F9/48 |
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