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Preparation technology of ethylene glycol terephthalate and preparation method of polyester

A technology for ethylene phthalate and a preparation process, which is applied in the field of polyester waste recycling and reuse, can solve the problems of high energy consumption and complicated processes, and achieves simplification of recycling devices, reduction of explosion-proof grades, number of equipment and technical requirements general effect

Active Publication Date: 2013-10-23
镇江宝利玛环保设备有限公司
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Problems solved by technology

[0012] The purpose of the present invention is to overcome the problems of cumbersome process and high energy consumption, and provide a preparation process of ethylene terephthalate and a preparation method of polyester. The BHET preparation process utilizes a chemical recovery method to provide an energy-efficient Low consumption, industrialized production process, the product index can reach the standard of food grade and environmental silk grade

Method used

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  • Preparation technology of ethylene glycol terephthalate and preparation method of polyester

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Embodiment 1

[0045] The continuous feed rate of polyester waste is 3350kg / h, remove impurities, dry, and feed continuously from the top of the pre-alcoholysis reactor through the discharge screw conveyor of the drier, and the feed temperature is less than 105°C;

[0046] After the polyester waste material enters the pre-alcoholysis reactor, it contacts step by step with the superheated steam of ethylene glycol added from the bottom of the pre-alcoholysis reactor to form the effect of a packed tower; the gas phase outlet at the top of the tower is controlled between 102°C and Residual moisture is removed; gas-phase water vapor is condensed into liquid by the tower top condenser, and part of it is refluxed into the reactor. The non-condensable components are sent to the tail gas device for treatment, and a little water is sent to the sewage treatment device.

[0047] Adjust the flow rate of superheated steam, and control the liquid phase temperature at the bottom of the tower to 215°C;

[00...

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Abstract

The invention provides a preparation technology of ethylene glycol terephthalate and a preparation method of a polyester. The preparation technology of the ethylene glycol terephthalate (BHET) comprises the steps of: pretreatment of polyester waste, pre-alcoholysis reaction, deep alcoholysis reaction, impurity removal of an alcoholysis product and the like. The polyester (PET) can be prepared again from the obtained BHET; by adopting the preparation technology of the BHET, a chemical recovery method is utilized; an industrial production technology with low energy consumption is provided; the index of the product can achieve the standards of food grade and environmental wire grade.

Description

technical field [0001] The invention belongs to the field of polyester waste recycling and reuse, and in particular relates to a preparation process of ethylene terephthalate and a preparation method of polyester. Background technique [0002] The polyester waste produced by polyester products has caused serious pollution to the environment. The disposal of polyester waste is a topic of worldwide concern. With the rapid development of the polyester industry, recycling and recycling technologies are being researched in various countries, and have developed from simple recycling to the ultimate recovery and regeneration of new raw material monomers. [0003] The chemical recovery and regeneration method of polyester (PET) new raw material monomer is a new direction of development, and the key to technology development is ethylene terephthalate, namely BHET. To strengthen the research and development of the recycling and regeneration of polyester waste, the focus is on the de...

Claims

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Application Information

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IPC IPC(8): C07C69/82C07C67/03C08G63/183C08G63/78
Inventor 李晓峰
Owner 镇江宝利玛环保设备有限公司
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