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Method for recycling extract water in the production of polyamide 6

A technology for extracting water and polyamide, applied in chemical instruments and methods, ion exchange column/bed methods, water pollutants, etc.

Active Publication Date: 2020-08-11
UHDE INVENTA FISCHER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Suspended and insoluble matter is further removed

Method used

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  • Method for recycling extract water in the production of polyamide 6
  • Method for recycling extract water in the production of polyamide 6
  • Method for recycling extract water in the production of polyamide 6

Examples

Experimental program
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Embodiment Construction

[0067] figure 1 A schematic process showing a polyamide 6 production process including a wastewater extraction circuit. A filtration unit (6) and an ion exchange module (7) comprising a cation exchange unit (i) and an anion exchange unit (ii) are located between the extractor (4) and the evaporation system (9). Units (6) and (7) ensure filtration and purification according to method steps a) and b). The container (8) is filled with ion exchange resin and comprises a cation exchange unit or a mixed ion exchange unit iii) for deodorization according to method step c), which container (8) can be arranged between the ion exchange module (7) and the evaporation system (8'). But preferably, the container is placed between the evaporation system and the extractor, more preferably, in the condensate of the evaporation system (8"). It is also possible to use two or more containers for deodorization.

[0068] figure 2 Shown in schematic form is the flow of mineral-laden extraction...

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PUM

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Abstract

The present invention relates to a method for recycling extract water accruing in the production of polyamide 6 or copolymers thereof, the method comprising the following steps: a) filtering the extract water using at least one filtration unit; b) purifying the filtered extract water in an ion exchange module, comprising at least the following ion exchange units: i) at least one cation exchange unit, ii) at least one anion exchange unit, the extract water flowing through the ion exchange units in the order i-ii; c) deodorising the extract water from step b) by iii) at least one cation exchangeunit or a mixed ion exchange unit which comprises at least one anion exchanger and at least one cation exchanger, the extract water having a temperature in the range of 80 to 100 DEG C throughout themethod.The invention further relates to a device for performing the method according to the invention and to the uses of said device.

Description

technical field [0001] The present invention relates to a method for recovering the extraction water produced in the production of polyamide 6 or its copolymer (PA6 / 66), and relates to a method for recovering the extracted water produced in the production of polyamide or its copolymer (PA6 / 66). Apparatus for extracting water, and the use of this apparatus for recovering extracted water produced in the production of polyamide 6 or its copolymers (PA6 / 66). Background technique [0002] In the production of polyamide 6 on an industrial scale, the crude product of the polymerization must be washed to remove caprolactam monomer as well as cyclic and linear caprolactam oligomers. Hot water is usually used in washing. The extraction water produced in this process usually contains 5 to 20% by weight of organic matter, which has to be reused for economical reasons. For this purpose, the organics are concentrated and used as feedstock for the polyamide 6 process, while the condensed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/42B01J47/028C02F1/00C02F101/38C02F103/38B01J47/04
CPCC02F1/004C02F1/42C02F2001/422C02F2001/425C02F2001/427C02F2101/38C02F2103/38C02F2209/02C02F2301/043C02F2303/02B01J39/05B01J39/07B01J47/028B01J47/04
Inventor 约翰内斯·凯泽
Owner UHDE INVENTA FISCHER