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PGMEA recycling method

A recovery method and technology of reflux ratio, applied in the separation/purification of carboxylic acid esters, organic chemistry, etc., can solve the problems of ineffective effect, large adsorbent load and easy damage, and large loss of PGMEA, etc., and achieve high product recovery rate , easy industrial processing, and low production cost

Pending Publication Date: 2021-04-06
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

However, the above methods all have certain deficiencies, for example: the effect of extraction is not obvious, the loss of PGMEA during adsorption is too large and the load of the adsorbent is large and easily damaged

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Pretreatment step: Take the PGMEA waste liquid produced by the 20L liquid crystal display array process and let it settle for 1-2 hours, and then transfer it to a filter for filtration to remove large solid waste.

[0028] The chromatographic analysis is carried out on the PGMEA waste liquid after the pretreatment step, so as to measure the components contained in the PGMEA waste liquid and their contents. The parameters of the chromatographic analysis are: polyethylene glycol quartz capillary column of 3m (length) × 0.25mm (inner diameter) × 1 μm (film thickness); hydrogen flame ionization detector; hydrogen flow rate is 25mL / min, air flow rate 160mL / min, nitrogen flow rate 22mL / min; inlet temperature 250°C, detection chamber temperature 240°C, column temperature 110°C; splitless injection, injection volume 0.4μl, solvent ethanol. Among them, splitless injection means that all samples enter the chromatographic column, which has high analytical sensitivity.

[0029] Th...

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Abstract

The invention provides a PGMEA recycling method, and the method is suitable for PGMEA waste liquid generated by a liquid crystal display array process. The method comprises the following steps: organic membrane filtration: filtering the PGMEA waste liquid through an organic membrane to remove moisture in the PGMEA waste liquid; true boiling point evaporation experiment: simulating and measuring the tower top temperature, the tower kettle temperature and the reflux liquid temperature of the rectifying tower, and obtaining a first-stage fraction and a second-stage fraction; rectification: taking a certain volume of PGMEA waste liquid into an intermittent rectification tower for heating, controlling the reflux ratio, and collecting a front fraction, a middle fraction and a rear fraction at different reflux liquid temperatures. The method is low in production cost, high in product recycling rate, high in purity and easy for industrial treatment, and has good social benefits and economic benefits.

Description

technical field [0001] The invention relates to the technical field of waste liquid recovery, in particular to a recovery method of PGMEA. Background technique [0002] Liquid crystal display (TFT-LCD) has developed rapidly since the 1990s and has gradually matured. Because of its advantages such as high definition, good image color, environmental protection, power saving, thinness and portability, it has been widely used in household Electrical appliances, computers and communication products. The liquid crystal display array process produces a large amount of PGMEA (propylene glycol methyl ether acetate) waste liquid. If it is discharged directly, it will pollute the ecological environment and cause waste of resources. At the same time, PGMEA is an important high-grade solvent, which has a strong solubility for polar and non-polar substances, and is widely used in the fields of coatings, inks, printing and dyeing, and pesticides. Therefore, the separation and purificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/48C07C69/16
CPCC07C67/48C07C69/16
Inventor 刘培植范斯娜彭娟邝萍王琼赵陈冬胡元娟班峰郑晓凤马千里刘国勇
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD