发明名称 |
Continuous polyamide extraction process |
摘要 |
A process for continuous extraction of polyamide particles using a recirculating extractant in a vertical extraction column that is divided into two zones comprises treating the polyamide with an aqueous extractant comprising from 40 to 95% by weight of epsi-caprolactam in a first zone at from 100 to 140° C., and then effecting an aftertreatment with water in a second zone. The caprolactam can then be extracted in a conventional manner. The process provides for economical production of polyamide having a low dimer content.
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申请公布号 |
US6326457(B1) |
申请公布日期 |
2001.12.04 |
申请号 |
US20000554214 |
申请日期 |
2000.05.11 |
申请人 |
BASF AKTIENGESELLSCHAFT |
发明人 |
ERBES JOERG;LUDWIG ALFONS;PIPPER GUNTER |
分类号 |
C08J3/12;B01D11/02;B29B9/16;C08G69/04;C08G69/16;C08G69/46;(IPC1-7):C08G69/08;C08G73/10;C08F6/00 |
主分类号 |
C08J3/12 |
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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