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Method and device for continuously producing aqueous solution of long-carbon-chain nylon salt

A technology of long carbon chain and nylon salt, which is applied in the field of continuous production of long carbon chain nylon salt solution, and can solve the problems of low solubility and incompatibility with water of long carbon chain nylon salt

Pending Publication Date: 2020-04-21
WUXI YINDA NYLON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The solubility of long carbon chain nylon salt in water is very low. Under normal temperature and pressure, long carbon chain nylon salt is very easy to precipitate and cannot be mixed with water.

Method used

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  • Method and device for continuously producing aqueous solution of long-carbon-chain nylon salt

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Embodiment 1

[0035] like figure 1As shown, a continuous production system for long carbon chain nylon salt is composed of a storage tank A 101, a storage tank B 102, a melting tank 105, a primary reaction kettle 201, a secondary reaction kettle 212 and a salt storage tank 301. There is a nitrogen pipe 1 on the upper part of the storage tank A 101 to provide nitrogen protection. There is a rotary valve A 103 at the bottom of the storage tank A 101 and a rotary valve B 104 at the bottom of the storage tank B 102 to feed materials to the melting tank 105 respectively. The level control system 1001 controls the feeding of long carbon chain diacids. When the storage tank B 102 reaches a low level, the rotary valve B 104 is stopped, and the rotary valve A 103 is started to continue feeding to the melting tank 105 . While tank A 101 is feeding melt tank 105, tank B 102 is recharged with long carbon chain diacids.

[0036] The temperature transmitter A 1002 monitors the temperature of the meltin...

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Abstract

The invention relates to a method and a device for continuously producing an aqueous solution of long-carbon-chain nylon salt, belonging to the field of preparation and production of nylon salts. Thepreparation method comprises the following steps: melting long-carbon-chain diacid, mixing the molten long-carbon-chain diacid with long-carbon-chain diamine and water, carrying out a secondary salifying reaction, and adjusting the pH value of the aqueous solution to obtain the aqueous nylon salt solution for a polycondensation reaction. The device comprises a continuous melting unit for the long-carbon-chain diacid and a corresponding control system thereof, a salifying reaction unit and a corresponding control system thereof, and a salt storage unit. According to the method, water is used asa solvent, organic solvents such as alcohol are avoided, production technological process is simplified, the quality of the produced long-carbon-chain nylon salt is guaranteed by flexibly controllingparameters such as temperature and pH in the production process, production cost is reduced, and large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of nylon salt preparation and production, and in particular relates to a method for continuously producing long carbon chain nylon salt solution and a corresponding production device. Background technique [0002] Long carbon chain nylons are nylons with more than 10 methylene groups between adjacent amide groups. The longer methylene chain and polar amide group make it have the dual characteristics of polyolefin and polyamide. The flexible methylene chain limited by the long carbon chain makes it have unique advantages such as good toughness, low water absorption, good dimensional stability, low temperature impact resistance and dielectric properties. It is used in automobiles, electronic appliances, aerospace, oil and alcohol, etc. important applications in the field. [0003] The industrial preparation of nylon salt usually uses ethanol or water as solvent. Invention CN 107573502 A discloses a preparat...

Claims

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Application Information

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IPC IPC(8): C07C209/00C07C211/09C07C51/41C07C55/02C08G69/28
CPCC07C209/00C07C51/412C08G69/28C07C211/09C07C55/02
Inventor 沈俊毅陈尚标胡瑞莉殷炼伟
Owner WUXI YINDA NYLON
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