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Method and equipment for obtaining ethylene glycol and diethylene glycol from recovered solution

A technology for recovering liquid and ethylene glycol, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of ether, etc. It can solve problems such as waste of EG and DEG, environmental pollution, complex components of transesterification products, etc., and achieve work efficiency high effect

Inactive Publication Date: 2021-02-05
AVANTGARDE SHANGHAI ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this recovery method, because the material undergoes homogeneous alcoholysis in a molten state, the alcoholyzed product directly enters the transesterification, so the components of the transesterified product are complex, including raw materials, components of the alcoholysis and transesterification steps, reactants and solvents. , while conventional continuous distillation and the EG recovery method of patent number 201910617917.9 and application number 201711158043.2 cannot extract EG and DEG well, resulting in a large amount of waste of EG and DEG, and also pollute the environment

Method used

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  • Method and equipment for obtaining ethylene glycol and diethylene glycol from recovered solution

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Effect test

Embodiment 1

[0056] Embodiment 1 Obtain the equipment of ethylene glycol and diethylene glycol in a kind of recovered liquid

[0057] Such as figure 1 As shown, the equipment includes a first rectification tower 1, a first thin-film evaporator 2, a second thin-film evaporator 3, and a second rectification tower 4, and the first rectification tower 1 is connected to the recovery liquid inlet, and the recovery The liquid enters the first rectification tower 1, and the 180°C atmospheric rectification process first removes methanol in the gaseous phase. After the methanol is condensed, it is collected in the methanol storage tank 5 to obtain the first mixed liquid. The output of the first rectification tower 1 end is connected with the liquid inlet end of the first mixed liquid storage tank 6, and the liquid outlet end of the first mixed liquid storage tank 6 is connected with the liquid inlet end of the first thin film evaporator 2, and the first thin film evaporator 2 The liquid inlet end i...

Embodiment 2

[0059] Embodiment 2 reclaims ethylene glycol and diethylene glycol from recovery liquid

[0060] Atmospheric rectification: The recovered liquid in the reaction kettle passes through the rectification tower and undergoes atmospheric rectification at 160°C to separate the first gas phase substance methanol to obtain the first mixed liquid, which is temporarily stored in the first mixed liquid storage tank , the first atmospheric distillation step separates methanol as a gas phase.

[0061] Negative pressure evaporation: lift the first mixed solution through the lift pump, and preheat the heater at 180°C, then enter the first thin film evaporator through the liquid inlet end of the first thin film evaporator, and the first mixed solution evaporates through the first thin film The evaporator obtains the first steam and the first evaporated liquid, and the first evaporated liquid flows into the intermediate storage tank, and then is transported to the second thin film evaporator t...

Embodiment 3

[0064] Embodiment 3 reclaims ethylene glycol and diethylene glycol from recovery liquid

[0065] Atmospheric rectification: The recovered liquid in the reaction kettle passes through the rectification tower and undergoes atmospheric rectification at 160°C to separate the first gas phase substance methanol to obtain the first mixed liquid, which is temporarily stored in the first mixed liquid storage tank , the first atmospheric distillation step separates methanol as a gas phase.

[0066] Negative pressure evaporation: lift the first mixed solution through the lift pump, and preheat the heater at 160°C, then enter the first thin film evaporator through the liquid inlet end of the first thin film evaporator, and the first mixed solution evaporates through the first thin film The evaporator obtains the first steam and the first evaporated liquid, and the first evaporated liquid flows into the intermediate storage tank, and then is transported to the second thin film evaporator t...

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Abstract

The invention provides a method for obtaining ethylene glycol and diethylene glycol from a recovered solution, which comprises the following steps of: atmospheric distillation: carrying out atmospheric distillation on the recovered solution, and separating out methanol to obtain a first mixed solution; negative-pressure evaporation: carrying out negative-pressure evaporation on the first mixed solution, and separating out a steam substance which contains diethylene glycol and ethylene glycol; and negative-pressure rectification: carrying out negative-pressure rectification on the steam substance to separate out a second gas-phase substance and a second mixed solution containing diethylene glycol, the second gas-phase substance containing ethylene glycol. According to the method, the ethylene glycol and the diethylene glycol in the recovered solution are separated by adopting a normal-pressure rectification and negative-pressure film evaporation mode, and then the ethylene glycol is separated by virtue of negative-pressure rectification, so that the recovery rate of the ethylene glycol is 99% or above, and the recovery rate of the diethylene glycol is 70%-80%. The equipment can perform continuous operation to continuously extract ethylene glycol and diethylene glycol, and is high in working efficiency.

Description

technical field [0001] The invention relates to the field of PET recycling, in particular to a method and equipment for obtaining ethylene glycol and diethylene glycol from the recovered liquid obtained by the continuous alcoholysis recovery method of waste polyester. Background technique [0002] The Chinese name of PET is: polyethylene terephthalate, which belongs to polyester polyester. PET is widely used as fiber, and engineering plastic resin can be divided into two categories: non-engineering plastic grade and engineering plastic grade. Non-engineering plastic grade is mainly used for bottles, films, sheets, and baking-resistant food containers. PET chips are divided into fiber-grade polyester chips and non-fiber-grade polyester chips. Fiber-grade polyester is used to manufacture polyester staple fibers and polyester filaments, and is the raw material for polyester fiber enterprises to process fibers and related products. Polyester is the most produced variety in chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/74C07C29/80C07C29/76C07C43/11C07C41/34C07C41/40C07C41/42
CPCC07C29/74C07C29/80C07C29/76C07C41/34C07C41/40C07C41/42
Inventor 方华玉王读彬卢旭坤余国清杨伟杜杠杠马健季锋周俊李天源朱恩斌敖四斌陈建华
Owner AVANTGARDE SHANGHAI ENVIRONMENTAL TECH CO LTD
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