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Continuous polymerization reaction process of polyamide

A technology for polymerization reaction and polyamide, which is applied in the field of continuous polymerization reaction process of polyamide, can solve problems such as expensive steam, and achieve the effects of high purity, guaranteed quality, and reduced energy consumption

Active Publication Date: 2020-11-10
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

Generating steam is expensive, and ejectors generate large volumes of waste steam
Additionally, the output from the ejector may contain contaminants drawn from the exhaust condenser
These contaminants may need to be removed, resulting in additional costs

Method used

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  • Continuous polymerization reaction process of polyamide
  • Continuous polymerization reaction process of polyamide
  • Continuous polymerization reaction process of polyamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] see figure 1 , image 3 and Figure 4 , is a specific embodiment of the polymerization device used in the continuous polymerization process of the present invention. The polymerization device includes a raw material preheating system 1, a polymerization reaction system 2, a steam condensation system 3, and a vacuum system 4. In this embodiment, the shell side of the raw material preheating system 1 is a heat medium channel, and the tube of the raw material preheating system 1 The tube side is a material channel, and the tube side is one or two tubes, and each tube is serpentine and extends through the shell side. The polymerization reaction system 2 includes a reaction tank body 21, the tank wall of the reaction tank body 21 is provided with a heat medium interlayer 22, and the reaction tank body 21 is provided with a stirring device 23, and the material inlet of the reaction tank body 21 passes through the first The pipeline 101 is connected to the material outlet o...

Embodiment 2

[0038] see figure 2 , is another specific embodiment of the polymerization device used in the continuous polymerization process of the present invention. In this embodiment, the washing tank body 43 is located upstream of the dry vacuum pump 41, the top of the condensation tower body 31 is connected to the washing tank body 43 through a pipeline, and is located below the second partition 45, and the top of the washing tank body 43 is connected to the washing tank body 43 through a pipe Road is connected with the inlet of dry vacuum pump 41. All the other structures are the same as in Embodiment 1.

Embodiment 3

[0039] Embodiment three uses the polymerization device of embodiment one to carry out continuous polymerization reaction

[0040] The nitrogen source provides nitrogen to the polymerization reaction system through the nitrogen pipeline, so that the polymerization reaction system is in a protective atmosphere, and the vacuum system evacuates the polymerization reaction system to form a negative pressure environment of 30-50KPaA, and the desalted water enters the washing tank, and After passing through several rows of tubes, it enters the condensation tank from the fourth pipeline, forms a circulation in the condensation tank and the condensed water circulation pipeline, and the liquid seal tank forms a liquid seal on the downstream end of the second pipeline. The pre-polymerized material (mixed with dicarboxylic acid and organic diamine) at 230°C has an average molar molecular weight of 230. It is heated to 273°C through the raw material preheating system, and then enters the po...

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Abstract

A continuous polymerization reaction process of polyamide is provided. A polymerization device adopted in the polyamide continuous polymerization reaction process comprises: a raw material preheatingsystem, a polymerization reaction system, a steam condensation system and a vacuumizing system; the polymerization reaction system is connected with the raw material preheating system through a pipeline, the vacuumizing system vacuumizes the polymerization reaction system through the steam condensation system, and the continuous polymerization reaction comprises the following steps: (1) heating apre-polymerization raw material to 250-300 DEG C through a raw material preheating system, feeding the pre-polymerization raw material into a polymerization reaction system, reacting in a protective atmosphere under the condition of 30-50 KPaA, and continuously extruding and discharging the material from a lower spiral discharging machine; (2) flashing moisture obtained by polymerization and dehydration in the polymerization reaction system into steam under the conditions of high temperature and negative pressure, stripping small molecular compounds in the polymerization reaction system, enabling the small molecular compounds to enter a steam condensation system, intercepting the steam and the small molecular compounds, and pumping out non-condensable gas by a vacuum pumping system. The impurity content in the product obtained by the process is less than or equal to 0.6 wt%, so that the quality of polyamide is effectively ensured, and the process is a safe and energy-saving process.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a continuous polymerization reaction process of polyamide. Background technique [0002] Polyamide is commonly known as nylon (Nylon), and its English name is Polyamide. It is a general term for polymers containing amide groups in the repeating unit of the macromolecular main chain. Polyamides can be prepared by ring-opening polymerization of lactams, or by polycondensation of diamines and dibasic acids. Polyamide (PA) refers to a polymer whose main chain contains polar amide groups (-CO-NH-). Originally used as a raw material for making fibers, PA has become a widely used engineering plastic in the industry due to its advantages such as toughness, wear resistance, self-lubrication, and wide temperature range. PA is widely used to replace copper and non-ferrous metals to make machinery, chemicals, and electrical parts, such as diesel engine fuel pump gears, water pumps, high-pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J3/00B01J3/02B01D5/00B01D53/44C08G69/28
CPCB01D5/003B01D5/0045B01D53/44B01J3/002B01J3/006B01J3/02C08G69/28
Inventor 赵风轩余爱平梁法锋钱江朱昊臣
Owner 华峰集团上海工程有限公司
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