A kind of continuous reaction method of polyamide

A polyamide and reaction technology, applied in the field of continuous polyamide reaction, can solve the problems of unutilized by-product steam, unstable product quality, and high energy consumption for polyamide polymerization, avoid entering the preheating system, and improve process steam. Utilization rate, the effect of reducing synthetic energy consumption

Active Publication Date: 2021-04-02
华峰集团上海工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the process of using dibasic acid and diamine to polymerize polyamide usually uses dibasic acid and diamine to prepare salt solution, and then transports it to the reactor for polymerization. The by-product steam generated by the reactor cannot be used , resulting in high energy consumption for the polymerization of polyamide, in addition, there are situations where the quality of different batches of products is not stable

Method used

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  • A kind of continuous reaction method of polyamide

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Experimental program
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Effect test

Embodiment 1

[0034]The reaction device used specifically includes a preheating system 1, a light removal system 2, a heating system 3, and a reaction system 4. Light removal system 2 is located below preheating system 1 and above heating system 3 and reaction system 4 . The tube-side inlet of the preheating system 1 is the polymerization raw material inlet 11 , and the tube-side outlet of the preheating system 1 is the polymerization raw material outlet 12 , which is connected to the feed port of the light removal system 2 . The shell side inlet of the preheating system 1 is the heating medium inlet 13, which is connected with the light components outlet of the light removal system 2. Usually, the shell side outlet of the preheating system 1 outputs uncondensed steam to the outside, and the shell side of the preheating system 1 The process is connected with the return port of the light removal system 2 through the return pipeline 14. Light removal system 2 is a tray tower, and N layers of...

Embodiment 2

[0036] Utilize the reaction device of embodiment one to carry out the continuous reaction of polyamide, specifically:

[0037] 1) 3.8MPa steam is introduced into the shell side of the heating system;

[0038] 2) The polymerization raw material is continuously discharged into the tube inlet of the preheating system, the feed temperature is 150°C, the composition of the polymerization raw material is dicarboxylic acid and organic diamine with a molar ratio of 1:1.005, and the polymerization raw material passes through the preheating system , Light removal system, enter the tube side of the heating system, raise the temperature to 238 ° C, evaporate part of the water, reduce the water in the polymerization raw material to 15%, and carry out the pre-polymerization reaction;

[0039] 3) The material obtained from the pre-polymerization reaction is discharged into the reaction system, dehydrated and reacted after pre-polymerization to generate process steam;

[0040] 4) The process...

Embodiment 3

[0045] Utilize the reaction device of embodiment one to carry out the continuous reaction of polyamide, specifically:

[0046] 1) Biphenyl-biphenyl ether vapor is introduced into the shell side of the heating system;

[0047] 2) The polymerization raw material is continuously discharged into the tube inlet of the preheating system, the feed temperature is 150°C, the composition of the polymerization raw material is dicarboxylic acid and organic diamine with a molar ratio of 1:1.006, and the polymerization raw material passes through the preheating system , Light removal system, enter the tube side of the heating system, raise the temperature to 230°C, evaporate part of the water, reduce the water in the polymerization raw material to 17.5%, and carry out the pre-polymerization reaction;

[0048] 3) The material obtained from the pre-polymerization reaction is discharged into the reaction system, dehydrated and reacted after pre-polymerization to generate process steam;

[004...

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Abstract

The invention relates to a continuous reaction process of polyamide. The continuous reaction by using a reaction device comprises the following steps: 1) introducing a heating medium into a shell passof a heating system; 2) enabling the polymerization raw material to pass through a preheating system and a light component removal system, discharging the polymerization raw material into a tube passof a heating system, heating the raw material to 200-250 DEG C until the water content in the polymerization raw material is reduced to be less than or equal to 20%, and carrying out a pre-polymerization reaction; 3) discharging a material obtained by prepolymerization into a reaction system, and carrying out a reaction after prepolymerization to generate process steam; 4) feeding the process steam into a light component removal system, heating the polymerization raw material passing through the light component removal system to 180-240 DEG C and feeding the raw material into a shell pass ofa preheating system, and heating the polymerization raw material passing through the preheating system to 180-230 DEG C; 5) condensing the process steam in the shell pass of the preheating system to serve as reflux liquid, and 6) continuously discharging when the viscosity is 150-300 cp to obtain a polyamide prepolymerization product. The reaction process is simple in process and low in synthesiscost, can effectively guarantee the quality stability of polyamide, and is a guarantee for producing high-end polyamide.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a continuous reaction method 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 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-pressure sealing rings, and oil pipel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/28C08G69/26B01J19/00
CPCB01J19/00C08G69/26C08G69/265C08G69/28
Inventor 赵风轩余爱平梁法锋朱昊臣
Owner 华峰集团上海工程有限公司
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