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Method for treating waste electronic solvent containing water, propylene glycol monomethyl ether and cyclopentanone

A technology of propylene glycol methyl ether and a treatment method, which is applied in the field of waste solvent recovery, can solve the problems of effective separation and recovery of difficult waste electronic solvents, achieve great economic and social benefits, simplify the operation process, and achieve high prices

Pending Publication Date: 2022-04-12
常州锦益辉化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem of effectively separating and recycling waste electronic solvents that are difficult to deal with in the prior art, a waste electronic solvent treatment method containing water, propylene glycol methyl ether, and cyclopentanone is provided

Method used

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  • Method for treating waste electronic solvent containing water, propylene glycol monomethyl ether and cyclopentanone
  • Method for treating waste electronic solvent containing water, propylene glycol monomethyl ether and cyclopentanone
  • Method for treating waste electronic solvent containing water, propylene glycol monomethyl ether and cyclopentanone

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Experimental program
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Effect test

Embodiment 1

[0070] 700 g of waste electronic solvent raw materials (containing water α, propylene glycol methyl ether β, and cyclopentanone γ) were treated by membrane separation to obtain a total material weight of 668 g. The appearance of the material was black. The components in the test material and the percentages of each component are shown in Table 1.

[0071] Table 1 The components of waste electronic solvent raw materials obtained after membrane separation treatment

[0072]

[0073] (Note: Other components in the table are divided into easily separated dimethyl sulfoxide DMSO, propylene glycol methyl ether acetate PMA and other heavy components).

[0074] For the processing method of this waste electronic solvent raw material, concrete steps are as follows:

[0075] (1) The waste electronic solvent is subjected to membrane separation treatment - tubular microfiltration membrane (TMF), the filter pore size is 0.2 microns, and suspended solids and large molecular weight colloid...

Embodiment 2

[0082] The A product obtained in Example 1 was enriched in one of the collection tanks through the batch rectification treatment system (600g of A product was obtained after being processed by multiple batches of raw materials, containing α43.64wt%, containing γ56.36wt%) Enter the subsequent continuous rectification treatment system for rectification treatment. The continuous rectification treatment system is composed of two rectification fraction systems: a special rectification separation part and a reagent addition or energy recovery part ( Figure 4 ), the A product is first entered into the second rectification tower T0201 of the special rectification separation section for continuous rectification (feeding at a rate of 120g / h), the second rectification tower T0201 has 20 theoretical plates, and adopts Atmospheric rectification (1 standard atmospheric pressure), reflux ratio is controlled at 4~6, adds entrainer toluene (400g) on ​​the first tray plate of the second rectifi...

Embodiment 3

[0085] The C product obtained by enriching in one of the collection tanks through the batch rectification treatment system in Example 1 (enrichment obtained after processing multiple batches of raw materials to obtain 600g C product, containing β 72.4wt% and containing γ 27.6wt% ) into the follow-up continuous rectification treatment system for rectification treatment. The continuous rectification treatment system consists of two rectification fraction systems: a special rectification separation part and a reagent addition or energy recovery part ( image 3 ), the C product is first entered into the second rectification tower T0201 (low pressure tower) of the special rectification separation section for continuous rectification (feeding at a rate of 120g / h), the second rectification tower T0201 theoretical plate number 20 pieces, the rectification pressure is controlled to be 8kPa, the reflux ratio is 4, and the top temperature is 45°C. After being condensed by the top condense...

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Abstract

The invention relates to a method for treating a waste electronic solvent containing water, propylene glycol monomethyl ether and cyclopentanone. The method comprises the following steps: (1) firstly carrying out membrane separation treatment on the waste electronic solvent to remove impurities such as colloid to obtain a material to be treated; (2) carrying out batch rectification treatment on the material to obtain a binary azeotrope and one of pure components in the binary azeotrope; (3) carrying out continuous rectification treatment on the azeotrope in one mode of thermal coupling pressure swing rectification treatment, azeotropic rectification treatment and extractive rectification treatment to obtain pure components; the method further comprises an operation process of enabling the pure components to enter an adsorption system for adsorption treatment after the pure components are obtained, and finally obtaining a propylene glycol monomethyl ether pure solvent product and a cyclopentanone pure solvent product of which the water content is less than or equal to 200PPM, wherein the propylene glycol monomethyl ether pure solvent product and the cyclopentanone pure solvent product are obtained. According to the method, complete separation and recovery of water, cyclopentanone and propylene glycol monomethyl ether can be achieved, the recovery rate is high, and the purity of the separated electronic solvent reaches 99% or above.

Description

technical field [0001] The invention relates to the technical field of waste solvent recovery, in particular to a method for treating waste electronic solvents containing water, propylene glycol methyl ether and cyclopentanone. Background technique [0002] Solvents such as propylene glycol methyl ether and cyclopentanone have extremely strong solvency due to their multifunctional groups, and are widely used in the electronics industry. Because of the different products in the electronics industry, many different mixtures of electronics solvents are used. Although the main components of the electronic solvents used are similar, the proportioning concentration is different, and a slight change in the composition and concentration of the solvent will also bring difficulties in the separation process. [0003] Prior art "Continuous Separation of Propylene Glycol Methyl Ether, Cyclopentanone and Propylene Glycol Methyl Ether Acetate", "Containing Cyclopentanone and Propylene Gl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/82C07C49/395C07C41/42C07C43/13
Inventor 翁居轼
Owner 常州锦益辉化工有限公司
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