Refining method and system for recovery liquid containing cyclopentanone and propylene glycol methyl ether acetate

A propylene glycol methyl ether acetate and cyclopentanone-containing technology, which is applied to the refining process and system field of the recovered liquid in the electronics industry containing cyclopentanone and propylene glycol methyl ether acetate, and can solve the problem that the components are easy to polymerize or decompose, explode, azeotrope And the relative volatility is small, the composition of the recovered liquid is complex, etc., to achieve the effect of safe and reliable production process, reducing the probability of polymerization, reducing corrosion and clogging

Pending Publication Date: 2019-01-11
江阴市大洋固废处置利用有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical difficulties in the refining process lie in the complex composition of the recovered liquid, the high boiling point of propylene glycol methyl ether acetate, the existence of azeotropy and low relative volatility of each component, and the characteristics of easy polymerization or decomposition and explosion of components during the separation process.
In the prior art, there is no technical scheme for refining waste liquid containing cyclopentanone and propylene glycol methyl ether acetate

Method used

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  • Refining method and system for recovery liquid containing cyclopentanone and propylene glycol methyl ether acetate
  • Refining method and system for recovery liquid containing cyclopentanone and propylene glycol methyl ether acetate

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Experimental program
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Effect test

Embodiment 1

[0036] Such as figure 1 Shown, the refining system that contains cyclopentanone and propylene glycol methyl ether acetate recovery liquid of embodiment 1 comprises pretreatment still 1, the first rectification tower 2, the second rectification tower 3, the third rectification tower 4 and The fourth rectification tower 5;

[0037] The outlet of the pretreatment still 1 is communicated with the first rectification tower 2, and the liquid phase outlet at the bottom of the first rectification tower 2 is communicated with the feed inlet of the second rectification tower 3;

[0038] The top gas phase outlet of the second rectification tower 3 is communicated with the feed inlet of the third rectification tower 4, and the outlet at the bottom of the third rectification tower 4 is communicated with the cyclopentanone receiving tank 10;

[0039] The liquid phase outlet at the bottom of the second rectifying tower 3 communicates with the feed port of the fourth rectifying tower 5, and ...

Embodiment 2

[0042] Such as figure 2As shown, embodiment 2 also comprises evaporator 7, and the feed port of evaporator 7 is communicated with the outlet of heavy component at the bottom of the fourth rectification tower 5, and the gas phase outlet of evaporator 7 is connected with the outlet of the fourth rectification tower 5. The feed port is connected.

[0043] A liquid filter 8 and a preheater 9 are connected between the discharge port of the pretreatment tank 1 and the feed port of the first rectification tower 2 .

Embodiment 3

[0045] The raw material pH value of embodiment 3 is 5.5, light black liquid, and composition is as shown in the following table:

[0046] components

Content % (weight percent)

Low boiling point organic solvents such as acetone

10

water

1.2

Cyclopentanone

50

Propylene glycol methyl ether acetate

35

Resin and metal impurities

3.8

[0047] The first, the second, the third and the fourth in embodiment 3 are atmospheric rectification;

[0048] The raw material with a pH value of 5.5 enters the pretreatment kettle, adds magnesium hydroxide, stirs and neutralizes to a pH value of 7.0~8.0, and enters the middle part of the first rectification tower;

[0049] Acetone is extracted from the top of the first rectification tower, the temperature at the top of the tower is 56.5±2°C, the temperature at the bottom of the tower is 135~138°C, and the light-recovered liquid is extracted from the bottom of the tower and enters th...

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Abstract

The invention discloses a refining method for a recovery liquid containing cyclopentanone and propylene glycol methyl ether acetate. The refining method comprises: dehydrating a recovery liquid, adjusting pH, filtering the recovery liquid to obtain a dehydrated recovery liquid, feeding the dehydrated recovery liquid into a first rectification tower, separating a low-boiling organic solvent fraction at the top of the tower and the light recovery liquid at the bottom of the tower, feeding the light recovery liquid at the bottom of the tower into a second rectification tower, separating a cyclopentanone-water fraction at the tower top and a propylene glycol methyl ether acetate heavy component at the tower bottom, feeding the cyclopentanone-water fraction from the tower top into a third rectification tower, separating a water fraction at the tower top and a cyclopentanone product at the tower bottom, feeding the propylene glycol methyl ether acetate heavy component from the tower bottom into a forth rectification tower, and separating a propylene glycol methyl ether acetate product at the tower top and a heavy component residue liquid at the tower bottom. The continuous rectificationmethod has low energy consumption, is safe and reliable in production, has a low resin residue liquid yield and has membrane filtration product purity of 99.91% or more. The product chroma and other indicators satisfy the electronic grade standards.

Description

technical field [0001] The invention relates to the technical field of recovery of hazardous chemicals in the electronics industry, in particular to a refining process and system for recycling liquid in the electronics industry containing cyclopentanone and propylene glycol methyl ether acetate. Background technique [0002] Cyclopentanone, melting point -58.2°C, boiling point 130.6°C, density 0.9487g / cm3 (20°C), insoluble in water, soluble in most organic solvents such as alcohol and ether, easy to polymerize, especially in the presence of trace amounts of acid. Propylene glycol methyl ether acetate (PGMEA), colorless hygroscopic liquid, melting point -87°C, boiling point 149°C, water solubility (solvent soluble in water) 16.0 ml / L (25°C), explosion limit: in air, at 20°C 1.5%~7.0% (volume). [0003] Wafers are the basic material for manufacturing semiconductor chips. Photolithography is one of the common processes in the wafer production process. The photoresist is main...

Claims

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Application Information

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IPC IPC(8): C07C27/28C07C45/78C07C45/82C07C49/395C07C67/48C07C67/54C07C69/16
CPCC07C45/78C07C45/82C07C67/48C07C67/54C07C2601/08C07C49/395C07C69/16
Inventor 胡晓峰刘文军
Owner 江阴市大洋固废处置利用有限公司
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