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Process for producing diamine and polyamide

A manufacturing method and technology of polyamide, applied in the field of polyamide manufacturing, can solve the problems of increased waste liquid treatment cost, low recovery rate of diamine, increased environmental load and the like

Active Publication Date: 2011-02-09
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the diamine is separated from the salt by the extraction operation, a large amount of organic solvent (for example, aniline, chloroform, etc.) is required, and if it is a diamine with a small distribution coefficient, the recovery rate of the diamine in the organic solvent layer is low, The problem that the extraction operation must be repeated using an organic solvent
Also, after the extraction operation, the organic solvent and the aqueous solution containing the organic solvent are discharged as a large amount of waste liquid, so there are problems such as increased cost of waste liquid treatment and increased environmental load

Method used

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  • Process for producing diamine and polyamide
  • Process for producing diamine and polyamide
  • Process for producing diamine and polyamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～12

[0084] (Preparation of 1,4-butanediamine sulfate aqueous solution separated by nanofiltration membrane)

[0085] In 10g / L 1,4-butanediamine sulfate aqueous solution (50L), add 1M calcium hydroxide aqueous solution (manufactured by Wako Pure Chemical Industries Co., Ltd.) to pH 9, 10, 11, and then at 25 Stir at °C for 1 hour. The precipitated calcium sulfate was filtered off by suction filtration with No. 2 qualitative filter paper (manufactured by Advantec), and 50 L of filtrate was recovered.

[0086] (Separation experiment using nanofiltration membrane)

[0087] Then, like figure 1 As shown, 50L of the filtrate obtained above is injected into the raw water tank 1 of the membrane filtration device, and when passing through the nanofiltration membrane, the pressure of the high-pressure pump 3 is adjusted to 1 MPa, and the permeated water 5 is recovered. Analyze the concentration of sulfate ions and calcium ions in raw water tank 1 and permeate water 5 with ion chromatography (manuf...

Embodiment 13～24

[0091] (Preparation of 1,5-pentanediamine sulfate aqueous solution separated by nanofiltration membrane)

[0092] In 10g / L 1,5-pentanediamine sulfate aqueous solution (50L), add 1M calcium hydroxide aqueous solution (manufactured by Wako Pure Chemical Industries Co., Ltd.) to pH 9, 10, 11, and then at 25 Stir at °C for 1 hour. The precipitated calcium sulfate was filtered off by suction filtration with No. 2 qualitative filter paper (manufactured by Advantec), and 50 L of filtrate was recovered.

[0093] (Separation experiment using nanofiltration membrane)

[0094] Then, like figure 1 As shown, 50L of the filtrate obtained above is injected into the raw water tank 1 of the membrane filtration device, and when passing through the nanofiltration membrane, the pressure of the high-pressure pump 3 is adjusted to 1 MPa, and the permeated water 5 is recovered. Analyze the concentration of sulfate ions and calcium ions in raw water tank 1 and permeate water 5 with ion chromatography (man...

Embodiment 25～36

[0098] (Preparation of 1,6-hexanediamine sulfate aqueous solution separated by nanofiltration membrane)

[0099] To 10g / L 1,6-hexamethylenediamine sulfate aqueous solution (50L), 1M calcium hydroxide aqueous solution was added to pH 9, 10, 11 respectively, and then stirred at 25°C for 1 hour. The precipitated calcium sulfate was filtered off by suction filtration with No. 2 qualitative filter paper (manufactured by Advantec), and 50 L of filtrate was recovered.

[0100] (Separation experiment using nanofiltration membrane)

[0101] Then, like figure 1 As shown, 50L of the filtrate obtained above is injected into the raw water tank 1 of the membrane filtration device, and when passing through the nanofiltration membrane, the pressure of the high-pressure pump 3 is adjusted to 1 MPa, and the permeated water 5 is recovered. Analyze the concentration of sulfate ions and calcium ions in raw water tank 1 and permeate water 5 with ion chromatography (manufactured by DIONEX), and analyze ra...

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PUM

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Abstract

Disclosed is a process for producing a diamine, comprising the step of purifying a diamine from an aqueous solution containing a diamine salt. Specifically, the process comprises the step of adding an alkaline substance to the aqueous solution and then filtering the aqueous solution through a nanofiltration film to remove the salt and thus to obtain an aqueous diamine solution, whereby a diamine suitable as a starting material for a polyamide can be obtained by a simpler operation than a conventional extraction operation with an organic solvent.

Description

Technical field [0001] The present invention relates to a method for producing diamine, including the process of purifying diamine from an aqueous solution containing a diamine salt; and also relates to a method for producing polyamide using diamine obtained by the method for producing diamine as a raw material. Background technique [0002] With nylon as the representative, diamine is used in many fields as the raw material of polyamide. For example, polyamide can be obtained by heating polycondensation reaction of diamine dicarboxylate with a molar ratio of diamine to dicarboxylic acid of 1:1. However, since the diamine used as a raw material is highly volatile, it will destroy the The molar balance of dicarboxylic acid requires addition of diamine in excess with respect to dicarboxylic acid (for example, Patent Document 1). The diamine added here must be a high-purity product that does not damage the physical properties of the polyamide resin. Therefore, a technology that can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/84C07C211/09
CPCB01D2317/022B01D61/58B01D61/027C08G69/28B01D61/025C07C209/84B01D71/60C08G69/26C07C211/09C07C211/12
Inventor 伊藤正照中川泉加藤公哉耳塚孝泽井健司峯岸进一泽井秀树山田胜成
Owner TORAY IND INC
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