| 发明名称 |
PURIFICATION OF XYLYLENE ORGANIC DIISOCYANATE BY FRACTIONAL DISTILLATION IN THE PRESENCE OF AN INERT GAS OR SUPERHEATED VAPOR OF AN ORGANIC SOLVENT |
| 摘要 |
Crude organic polyisocyanate is fractionated at a low temperature in the presence, in the fractionation column, of an inert gas (nitrogen gas, natural gas, carbon dioxide gas) and purified organic polyisocyanate is obtained in a high yield. |
| 申请公布号 |
US3658656(A) |
申请公布日期 |
1972.04.25 |
| 申请号 |
USD3658656 |
申请日期 |
1968.11.07 |
| 申请人 |
TAKEDA CHEMICAL INDUSTRIES LTD. |
发明人 |
OSAMU ADICA;KENJI NAITO;KATSUHIKO OGINO;HIROYUKI KURODA |
| 分类号 |
B01D3/34;C07C69/00;C07C265/08;(IPC1-7):01D3/34;07C69/00 |
主分类号 |
B01D3/34 |
| 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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