Recovery device and recovery process of waste polyester bottle flakes

Abstract

The invention provides a recovery device and a recovery process of waste polyester bottle flakes, wherein the device comprises a cleaning device, a lifting device, a crusher, and an after-alcoholysis reactor, which are orderly communicated; a plurality of redistributors are fixedly arranged inside the cleaning device from top to bottom at intervals; a rotating shaft penetrates through an opening of each redistributor in a rotating manner; a mixing blade is arranged on the rotating shaft; a through hole is arranged on each redistributor; the cleaning device is communicated with an ethanediol steam pipeline; an ethanediol liquid pipeline is arranged on the after-alcoholysis reactor; a heating device is arranged inside the after-alcoholysis reactor; the temperature of the cleaning device is gradually reduced to 90 DEG C from 240 DEG C from bottom to top. The recovery device is cleaned by ethanediol, so that the recovery device is cleanly cleaned; the alcoholysis reaction is easily controlled; the recovery cost is low. A front-alcoholysis reactor also can be added between the crusher and the after-alcoholysis reactor, so that the section can be cut; the total standing time is shortened.

Description

technical field [0001] The invention belongs to the field of recycling and utilization of polymer plastic materials, in particular to a recycling device and a recycling process of waste polyester bottle flakes. Background technique [0002] The recycling of polyester bottles is a very important part in the technical field of polymer plastic materials recycling. The recycling of polyester bottles mainly includes the early cleaning stage and the subsequent recycling stage. [0003] In the cleaning stage, in the prior art, most of the oil stains and paints on the surface of polyester bottle flakes are removed through the cooking alkali pool, which has many disadvantages: 1) The solvent is highly corrosive and seriously damages the equipment body of the cooking machine; 2) The lye used for cleaning is not easy to recycle and can only be discharged into the sewage pool, which not only causes waste of resources, but also seriously pollutes the environment. [0004] In the recycl...

AI Technical Summary

Problems solved by technology

[0003] In the cleaning stage, in the prior art, most of the oil stains and paints on the surface of polyester bottle flakes are removed through the cooking alkali pool, which has many disadvantages: 1) The solvent is highly corrosive and seriously damages the equipment body of the cooking machine; 2) The lye used for cleaning is not easy to recycle and can only be discharged into the sewage pool, which not only causes a waste of resources, but also seriously pollutes the environment

Recently, some "bottle" to "bottle" technologies and "bottle" to "fiber" technologies have been developed, but these "bottle" to "bottle" and "bottle" to "fiber" technologies use ethylene glycol for alcohol During the hydrolysis reaction, since the melting point of polyester bottle flakes is 270°C, the temperature of the alcoholysis reactor is generally about 270°C, and the remaining ethylene glycol vapor (the boiling point of ethylene glycol is 197.3°C) is recovered and reused , it needs to be reheated to raise the temperature, and the energy is wasted a lot. Moreover, the cleaning agent used in the cleaning stage is different from the reactant used in the recycling stage, which makes the entire cleaning and recycling process cumbersome and complex in the structural design of the equipment.

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