Title:
ポリアミド製造プロセスにおける抽出水の連続的再循環方法およびその装置
Document Type and Number:
Japanese Patent JP6393308
Kind Code:
B2
Abstract:
Continuously recycling extract waters in polyamide production process comprises polymerizing, granulating and subsequently extracting the granules with water. The method comprises concentrating the extract water of at least one production line, subjecting the extract water as an extract water flow to re-polymerizator for degradation of cyclic oligomers, diluting the extract water as re-polymerization with at least an inflow and subsequently supplying as a mixed stream of the polymerization. Continuously recycling extract waters in polyamide production process comprises polymerizing, granulating and subsequently extracting the granules with water. The method comprises concentrating the extract water of at least one production line, subjecting the extract water as an extract water flow to re-polymerization for degradation of cyclic oligomers, diluting the extract water as re-polymerizate with at least an inflow, and subsequently supplying as a mixed stream of the polymerization. The temperature is adjusted to 220-280[deg] C, the water content is adjusted to 20-40 wt.% and the residence time is adjusted to 0.5-20 hours to maximize the oligomer degradation during the re-polymerization. The pressure formation is reduced by metering at least one inflow containing caprolactam for direct supply of the mixed stream in the production process of polyamide. An independent claim is also included for a device for continuously recycling the extract water in polyamide production process comprising (a) re-polymerizator for degradation of cyclic oligomers, (b) a premixer for mixing fresh lactum, optionally additives and mixed stream, (c) a bypass for recycling the circular flow, which is branched into the premixer and dosed at a feed point prior to the premixer, and (d) a pump, which is arranged in the bypass, for conveying the circular flow.
Inventors:
Katzer, Johannes
Siebecke, Eckehard
Siebecke, Eckehard
Application Number:
JP2016504519A
Publication Date:
September 19, 2018
Filing Date:
January 28, 2014
Export Citation:
Assignee:
Ude Inventa-Fisher Gamebecher
International Classes:
C08G69/46; B01F5/06; B01F5/10; C08G69/16; C08J11/02
Domestic Patent References:
| JP2010507701A | ||||
| JP51096891A | ||||
| JP2003501533A | ||||
| JP2009535468A | ||||
| JP7258404A | ||||
| JP2012511604A | ||||
| JP2002526578A |
Foreign References:
| US5077381 | ||||
| WO2012168252A1 | ||||
| WO2006064656A1 |
Attorney, Agent or Firm:
Shinjiro Ono
Yasushi Kobayashi
Shigeo Takeuchi
Osamu Yamamoto
Noriyuki Arai
Yasushi Kobayashi
Shigeo Takeuchi
Osamu Yamamoto
Noriyuki Arai