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A continuous concentration system for refined salt for polyamide

A concentration system and polyamide technology, applied in the chemical industry, can solve problems such as time-consuming, fouling, and product quality degradation, and achieve the effect of reducing costs

Active Publication Date: 2021-07-20
华峰集团上海工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the concentration is usually carried out in the form of heating and stirring. This concentration process is interval concentration, which takes a long time and is difficult to control the concentration. In addition, it is also prone to crystallization and scaling due to excessive concentration, resulting in The quality of the product obtained is seriously degraded

Method used

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  • A continuous concentration system for refined salt for polyamide

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Effect test

Embodiment 2

[0026] Adopt the concentration system of embodiment one to carry out continuous concentration, concrete steps are:

[0027] 1) The refined salt solution mixed with adipic acid and hexamethylenediamine (the total mass content of adipic acid and hexamethylenediamine is 50%) is preheated to 115°C by the refined salt preheater, and enters the refined salt evaporation through the feed pipe and collecting pipe device, the flow rate is 6t / h;

[0028] 2) The heat medium used in the refined salt evaporator is saturated process steam with a pressure of 0.5-1.5MPaG. The refined salt solution is evaporated in the refined salt evaporator to obtain gaseous materials with a pressure of 0.1-0.5MPa. The gaseous materials enter the refined salt through the material pipe In the stripper;

[0029] 3) The macromolecular components in the gaseous material in the refined salt stripper are intercepted and collected into the lower part of the inner space of the refined salt stripper, and the small mole...

Embodiment 3

[0032] Adopt the concentration system of embodiment one to carry out continuous concentration, concrete steps are:

[0033] 1) The refined salt solution mixed with adipic acid and hexamethylenediamine (the total mass content of adipic acid and hexamethylenediamine is 53%) is preheated to 113°C by the refined salt preheater, and enters the refined salt evaporation through the feed pipe and collecting pipe device, the flow rate is 6.5t / h;

[0034] 2) The heat medium used in the refined salt evaporator is saturated process steam with a pressure of 0.5-1.5MPaG. The refined salt solution is evaporated in the refined salt evaporator to obtain gaseous materials with a pressure of 0.1-0.5MPa. The gaseous materials enter the refined salt through the material pipe In the stripper;

[0035] 3) The macromolecular components in the gaseous material in the refined salt stripper are intercepted and collected into the lower part of the inner space of the refined salt stripper, and the small ...

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Abstract

A refined salt continuous concentration system for polyamide, comprising a refined salt preheater, a refined salt evaporator, and a refined salt stripper, the refined salt stripper is located below the refined salt preheater and above the refined salt evaporator, and the refined salt evaporator A collecting pipe extending downward is provided at the bottom of the bottom, the inner space lower part of the refined salt stripper is communicated with the inner space upper part of the refined salt evaporator through the material pipe, and the bottom of the refined salt stripper is connected with the collecting pipe through a circulation pipe, the The circulation pipe is also provided with a concentrated material discharge pipe, and a first valve is set to control the opening and closing. The material outlet of the refined salt preheater is connected with the collection pipe through the feed pipe, and is located above the downstream end of the circulation pipe. The heat medium inlet of the heater is connected with the top of the refined salt stripping tower through a steam pipe. The invention has simple structure and convenient operation, can realize continuous concentration of refined salt for polyamide, reduces the cost of concentration of refined salt, can effectively avoid crystallization and fouling, and is the guarantee for producing high-quality polyamide.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a continuous concentration system for polyamide refined salt. Background technique [0002] Polyamide is mainly used for synthetic fibers. Its most prominent advantage is that its wear resistance is higher than that of all other fibers, 10 times higher than cotton and 20 times higher than wool. Adding some polyamide fibers to blended fabrics can Greatly improve its wear resistance; when stretched to 3-6%, the elastic recovery rate can reach 100%; it can withstand tens of thousands of times of bending without breaking. The strength of polyamide fiber is 1-2 times higher than that of cotton, 4-5 times higher than that of wool, and 3 times that of viscose fiber. However, the heat resistance and light resistance of polyamide fiber are poor, and the retention is not good, and the clothes made of it are not as crisp as polyester. [0003] Polyamide is commonly known as nylon (Nylon),...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/38B01D3/00
CPCB01D3/007B01D3/38
Inventor 赵风轩钱江陈发挥梁法锋余爱平
Owner 华峰集团上海工程有限公司
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