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Refined salt continuous concentration system for polyamide

A concentration system, polyamide technology, applied in distillation separation, distillation energy recovery, chemical instruments and methods, etc., can solve problems such as difficulty in controlling concentration concentration, scaling, crystallization, etc.

Active Publication Date: 2020-10-27
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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  • Refined salt continuous concentration system for polyamide

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Effect test

Embodiment 2

[0027]Adopt the concentration system of embodiment one to carry out continuous concentration, concrete steps are:

[0028] 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;

[0029] 2) The heat medium used in the refined salt evaporator is saturated process steam, the pressure is 0.5-1.5MPaG, the refined salt solution is evaporated in the refined salt evaporator, and the gaseous material is obtained, the pressure is 0.1-0.5MPa, the gaseous material enters the refined salt through the material pipe In the stripper;

[0030] 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...

Embodiment 3

[0033] Adopt the concentration system of embodiment one to carry out continuous concentration, concrete steps are:

[0034] 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 the collecting pipe device, the flow rate is 6.5t / h;

[0035] 2) The heat medium used in the refined salt evaporator is saturated process steam, the pressure is 0.5-1.5MPaG, the refined salt solution is evaporated in the refined salt evaporator, and the gaseous material is obtained, the pressure is 0.1-0.5MPa, the gaseous material enters the refined salt through the material pipe In the stripper;

[0036] 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 ...

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Abstract

The invention discloses a refined salt continuous concentration system for polyamide. The system comprises a refined salt preheater and a refined salt evaporator, and a refined salt stripping tower, the refined salt stripping tower is positioned below the refined salt preheater and positioned above the refined salt evaporator; a collecting pipe extending downwards is arranged at the bottom of therefined salt evaporator; the lower part of the inner cavity of the refined salt stripping tower is communicated with the upper part of the inner cavity of the refined salt evaporator through a material pipe; the bottom of the refined salt stripping tower is connected with a collecting pipe through a circulating pipe; a concentrated material discharging pipe is further arranged on the circulating pipe, a first valve is arranged to control opening and closing of the circulating pipe, a material outlet of the refined salt preheater is connected with the collecting pipe through a feeding pipe andlocated above the downstream end of the circulating pipe, and a heat medium inlet of the refined salt preheater is connected with the top of the refined salt stripping tower through a steam pipe. Thesystem is simple in structure and convenient to operate, can realize continuous concentration of refined salt for polyamide, reduces the concentration cost of the refined salt, can effectively avoid crystallization and scaling phenomena, and is a 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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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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