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Process for producing polyamide

A technology for polyamides and polycondensation products, applied in the field of polyamide manufacturing, can solve the problems of less flexibility, frequent disassembly of cleaning devices, high maintenance costs, etc.

Active Publication Date: 2010-03-17
POLYAMIDE HIGH PERFORMANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They necessitate frequent cleaning of the device and thus a shutdown and dismantling, resulting in high maintenance costs
Also, these methods are less flexible

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0080] 1157 kg / h of an aqueous solution comprising 70% by weight of hexamethylenediammonium adipate was fed at 150°C into a helically coiled pipe made of stainless steel located in a cylindrical vessel, which was heated by a hot fluid Heated to 280°C and has a diameter of 1 meter and a height of 4 meters. This pipe, having an internal diameter of 40.9 mm and a length of 440 meters, conveys the reaction stream to a separator of the cyclone type, which is also heated to 280° C. by a thermal fluid. The stream exiting the tube and entering the separator consisted of an aqueous prepolymer solution having a viscosity index approximately equal to 30 mL / g and a vapor phase mainly consisting of water.

[0081] The duration of the reaction in the tube is about 15 minutes, the pressure at the tube inlet is equal to 2.6 MPa. The pressure in the separator was regulated at 1.9 MPa by using a pressure reducing valve, which made it possible to remove part of the vapor phase in an amount of 3...

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Abstract

The present invention relates to a process for producing polyamide of the type of those obtained by polycondensation from diacids and diamines and / or the type of those obtained by polycondensation from lactams and / or amino acids. The process is entirely suitable for the production of polyhexamethylene adipamide.

Description

technical field [0001] This invention relates to a process for the manufacture of polyamides. The polyamides are those of the type obtained by polycondensation of diacids and diamines and / or of those types of polyamides obtained by polycondensation of lactams and / or amino acids. This method is especially suitable for the manufacture of polyhexamethylene adipamide. Background technique [0002] Polyamides are polymers of great industrial and commercial interest. The thermoplastic polyamides are obtained by reaction between two different monomers or by polycondensation of a single monomer. The invention applies on the one hand to polyamides obtained from two different monomers, the most important of which is polyhexamethylene adipamide. Of course, these polyamides are obtainable from mixtures of diacids and diamines. Thus, for polyhexamethylene adipamide, the main monomers are hexamethylenediamine and adipic acid. However, these monomers may contain up to 25 mol % of othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/16C08G69/18C08G69/28
CPCC08G69/16C08G69/04C08G69/28C08G69/08C08G69/18
Inventor J-F·蒂埃里S·洛梅尔V·莫莱M·赫尔夫特C·菲隆
Owner POLYAMIDE HIGH PERFORMANCE
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