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
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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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