Polyamide production system

Abstract

The invention discloses a polyamide production system. According to the technological processes, the polyamide production system comprises a polymerization device, an acidification kettle, a sheet frame pressure filter, a transition kettle, a centrifugal separation device, a film evaporator, a molecular distillation device, a pipeline changing and filtering device, a polycondensation device, a filter device and a prilling system in sequence from former to latter. According to the technological processes, the prilling system comprises a prilling mechanism, a particle conveying mechanism and a prilling, classifying and discharging mechanism in sequence from former to latter. The polyamide production system has the advantages of being high in processing efficiency, good in processing safety and low in product impurity rate.

Description

Technical field [0001] The invention relates to the field of polyamide preparation, in particular to a polyamide production system. Background technique [0002] Polyamide resin, PA for short, is a polymer with amide bonds in the main chain. It can be obtained by polycondensation of diamine and diacid, and ring-opening polymerization of lactam. Due to the different types of dibasic acid and diamine used, a variety of polyamide resins can be obtained. According to the relative molecular weight, it can be roughly divided into high molecular polyamide resin and low molecular polyamide resin. [0003] Macromolecular polyamide resin, known as nylon or polyamide, is composed of linear aliphatic diacids and diamines. It is mainly used to prepare synthetic fibers and engineering plastics. It has a relatively complete development and research process. . [0004] Low-molecular polyamide resin is obtained by polycondensation reaction of dimer acid and diamine or polyamine, also known as dim...

AI Technical Summary

Problems solved by technology

This granulation method needs to fix a motor position on the granulator, and the flexibility of equipment installation is poor

In the traditional process, the particles granulated by the granulator are directly fed, but at this time the particles have not been cooled and some organic waste gas is still volatilized

In addition, due to the fact that some lighter flocs will be produced during the granulation process, they will be brought into the unloading device after direct feeding, which will cause trouble for subsequent cleaning

Moreover, the granulation and classification discharge process of the traditional process is mostly manually screened, and the screening efficiency is low.

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