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Purification method for reducing chromaticity of N-methyl pyrrolidone

A technology of methyl pyrrolidone and a purification method, applied in the field of chromaticity refining, can solve the problems of reducing N-methylpyrrolidone, unable to reduce the chromaticity of N-methylpyrrolidone, etc., and achieves the effect of ensuring purity

Pending Publication Date: 2021-07-30
NINGBO NATA OPTO ELECTRONICS MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present invention provides a purification method for reducing the chroma of N-methylpyrrolidone, which aims to solve the problem that N-methylpyrrolidone cannot be reduced when N-methylpyrrolidone is used as a photoresist remover in the prior art. Chromaticity problem of base pyrrolidone

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] S1. Import the crude product of N-methylpyrrolidone into a primary reaction kettle, add activated carbon and stir at 60°C for 60 minutes to complete the adsorption treatment, and then obtain the crude product after adsorption treatment; wherein, the activated carbon Quality is 1% of described N-methylpyrrolidone crude product quality,

[0028] S2. After removing the activated carbon in the crude product after the adsorption treatment, put it into a rectification tower for rectification to obtain N-methylpyrrolidone after rectification; wherein, the temperature at the bottom of the rectification tower is 120°C, tower top temperature 108°C, condensate water temperature 0°C, reflux ratio 10:1, absolute pressure at the bottom of the tank 5000Pa;

[0029] S3. Filter the rectified N-methylpyrrolidone using a filter with a pore size of 5 microns to obtain purified N-methylpyrrolidone.

Embodiment 2

[0031] S1. Import the crude product of N-methylpyrrolidone into a primary reaction kettle, add activated carbon and stir at 40°C for 40 minutes to complete the adsorption treatment, and then obtain the crude product after adsorption treatment; wherein, the activated carbon Quality is 4% of described N-methylpyrrolidone crude product quality,

[0032] S2. After removing the activated carbon in the crude product after the adsorption treatment, put it into a rectification tower for rectification to obtain N-methylpyrrolidone after rectification; wherein, the temperature at the bottom of the rectification tower is 100°C, tower top temperature 98°C, condensate water temperature 0°C, reflux ratio 20:1, absolute pressure at the bottom of the tank 4000Pa;

[0033] S3. Filter the rectified N-methylpyrrolidone using a filter with a pore size of 3 microns to obtain purified N-methylpyrrolidone.

Embodiment 3

[0035] S1. Import the crude product of N-methylpyrrolidone into a primary reaction kettle, add activated carbon and stir at 50°C for 80 minutes to complete the adsorption treatment, and then obtain the crude product after adsorption treatment; wherein, the activated carbon Quality is 2% of described N-methylpyrrolidone crude product quality,

[0036] S2. After removing the activated carbon in the crude product after the adsorption treatment, put it into a rectification tower for rectification to obtain N-methylpyrrolidone after rectification; wherein, the temperature at the bottom of the rectification tower is 110°C, the temperature at the top of the tower is 103°C, the temperature of the condensed water is 0°C, the reflux ratio is 30:1, and the absolute pressure at the bottom of the tank is 4500Pa;

[0037]S3. Filter the rectified N-methylpyrrolidone using a filter with a pore size of 8 microns to obtain purified N-methylpyrrolidone.

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Abstract

The embodiment of the invention discloses a purification method for reducing the chromaticity of N-methyl pyrrolidone, which comprises the following steps: introducing an N-methyl pyrrolidone crude product into a first-stage reaction kettle, and adding activated carbon for adsorption treatment to obtain a crude product after adsorption treatment; removing activated carbon in the crude product after adsorption treatment, and putting the crude product into a rectifying tower for rectification to obtain rectified N-methyl pyrrolidone; and filtering the rectified N-methyl pyrrolidone, so as to obtain the purified N-methyl pyrrolidone. In the process of purifying the N-methyl pyrrolidone crude product by the method, the active carbon is adopted to adsorb the N-methyl pyrrolidone crude product, and the adsorbed N-methyl pyrrolidone is rectified and filtered, so that the purified N-methyl pyrrolidone not only has the chromaticity of the N-methyl pyrrolidone lower than 2, but also the purity of the N-methyl pyrrolidone is ensured, and the requirements of a photoetching process are greatly met.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a refining method for reducing the chroma of N-methylpyrrolidone. Background technique [0002] N-methylpyrrolidone (N-methylpyrrolidone), also known as 1-methyl 2-pyrrolidone, referred to as NMP, is a polar aprotic solvent with high boiling point, strong polarity, low viscosity, strong solvency, no Corrosion, low toxicity, strong biodegradability, low volatility, excellent chemical and thermal stability. N-Methylpyrrolidone is mainly used in many industries such as petrochemical industry, plastic industry, pharmaceuticals, pesticides, dyes, and lithium-ion battery manufacturing. It is also used in photoresist removers and other electronic product production and cleaning agents. The existing technology does not consider how to reduce the chromaticity of N-methylpyrrolidone in the process of improving the quality of N-methylpyrrolidone. For example, patents CN2010106025...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/267
CPCC07D207/267
Inventor 周浩杰马潇李庆伟陈情丽顾大公毛智彪许从应
Owner NINGBO NATA OPTO ELECTRONICS MATERIAL CO LTD