发明名称 |
Method of continuously extracting polyamide |
摘要 |
A process for continuous extraction of polyamide particles in an essentially vertical extraction column using an aqueous extractant comprises using an extraction column that is divided into two zones and performing an extraction with a recirculating 15-40% strength by weight aqueous epsi-caprolactam solution in the first zone and then with countercurrent water at a from 5 to 40° C. lower temperature in the second zone. The process provides for economical extraction of polyamides with a low level of monomers and oligomers. |
申请公布号 |
PL192671(B1) |
申请公布日期 |
2006.11.30 |
申请号 |
PL19980341572 |
申请日期 |
1998.11.24 |
申请人 |
BASF AKTIENGESELLSCHAFT |
发明人 |
HILDENBRAND PETER;LANG REINHARD;LUDWIG ALFONS;PIPPER GUNTER |
分类号 |
C08G69/48;C08J3/12;B29B9/16;C08G69/16;C08G69/46 |
主分类号 |
C08G69/48 |
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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