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A continuous concentration process of refined salt for polyamide

A technology for polyamide and refined salt is applied in the field of continuous concentration process of refined salt for polyamide, which can solve the problems of scaling, product quality decline, time-consuming and the like

Active Publication Date: 2021-07-30
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 process of refined salt for polyamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] see figure 1, the concentration system includes a refined salt preheater 1, a refined salt evaporator 2, and a refined salt stripper 3, and the refined salt stripper 3 is located below the refined salt preheater 1 and above the refined salt evaporator 2. The bottom of the refined salt evaporator 2 is provided with a collection pipe 4 extending downwards. Generally, the collection pipe extends vertically downwards, and the extension height of the collection pipe is 1.0-10m. The lower part of the inner space of the refined salt stripper 3 communicates with the upper part of the inner space of the refined salt evaporator 2 through the material pipe 5, and the upper part of the inner space of the refined salt stripper 3 is provided with a tower internal part 31, specifically, the tower internal part 31 is Tray column internals. The bottom of the refined salt stripper 3 is connected to the collecting pipe 4 through the circulation pipe 6, and the concentrated material disch...

Embodiment 2

[0036] Adopt the concentration system of embodiment one to carry out continuous concentration, concrete steps are:

[0037] 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 the collecting pipe device, the flow rate is 6t / h;

[0038] 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;

[0039] 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 smal...

Embodiment 3

[0042] Adopt the concentration system of embodiment one to carry out continuous concentration, concrete steps are:

[0043] 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;

[0044] 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;

[0045] 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 process for polyamide, the concentration system used includes a refined salt preheater, a refined salt evaporator, a refined salt stripper, the refined salt stripper is located below the refined salt preheater and above the refined salt evaporator, the concentration process It is: the refined salt solution is preheated by the refined salt preheater, enters the refined salt evaporator from the feed pipe and the collecting pipe to evaporate, and obtains the gaseous material, which enters the refined salt stripping tower through the material pipe, and the macromolecular components in it are intercepted and small Molecular components and water vapor enter the refined salt preheater from the steam pipe, and the macromolecular components pass through the circulation pipe, and under the action of gravity, part returns to the refined salt evaporator to form a cycle, and part is continuously discharged through the concentrated material discharge pipe to obtain concentrated The final refined salt has a solid content of 60-90wt%. The invention has simple process and convenient operation, is used for continuously concentrating polyamide salt solution to obtain refined salt, has low cost of concentrating refined salt, and can effectively avoid crystallization and fouling, which 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 process of refined salt for polyamide. 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 (Nyl...

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 赵风轩梁法锋钱江陈发挥余爱平
Owner 华峰集团上海工程有限公司
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