Refining method of N-methyl pyrrolidone product

A technology of methylpyrrolidone and refining method, which is applied in the direction of organic chemistry, can solve the problems of low processing efficiency, complicated operation, low fiber adsorption efficiency, etc., and achieve the effect of reducing light impurity content and improving product purity

Active Publication Date: 2018-11-13
MAIQI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN102001986A needs to use an ion exchange device composed of macroporous adsorption resin, strongly acidic ion exchange resin, and strongly basic ion exchange resin; patent CN102190611A needs to use an ion exchange device composed of nonpolar macroporous resin column and charged cellulose membrane , the methods disclosed in these two patent applications use many types of ion exchange resins, complex operations, and low tre

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  • Refining method of N-methyl pyrrolidone product
  • Refining method of N-methyl pyrrolidone product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of refining method of N-methylpyrrolidone product, comprises the following steps:

[0026] Such as figure 1 As shown, the N-methylpyrrolidone (raw material) that needs to be purified is sent to the rectification tower 1 for distillation, and the overhead distillate of the rectification tower 1 is sent to the primary heat exchanger 2 for primary condensation. The gas phase product of the first stage condensation is sent to the secondary heat exchanger 3 for secondary condensation, the liquid phase product after the first stage condensation is sent to the first stage reflux tank 4, the gaseous product of the second stage condensation is discharged, and the liquid phase product after the second stage condensation The product is refluxed to the rectification tower 1 through the secondary reflux tank 5, and part of the product in the primary reflux tank 4 is refluxed to the rectification tower 1, and part of it is recovered as N-methylpyrrolidone refined product (into...

Embodiment 2

[0029] A kind of refining method of N-methylpyrrolidone product, comprises the following steps:

[0030]The N-methylpyrrolidone (raw material) that needs to be purified and purified is sent to the rectification tower for distillation, the overhead distillate of the rectification tower is subjected to primary condensation, and the gas phase product after primary condensation is subjected to secondary condensation and primary condensation The final liquid phase product is sent to the primary reflux tank, and the gas phase product after the secondary condensing is discharged, the liquid phase product after the secondary condensing is refluxed to the rectification tower through the secondary reflux tank, and the product in the primary reflux tank is partially refluxed To the rectification tower, and at the same time, part of it is recovered as a refined product of N-methylpyrrolidone; the bottom of the rectification tower is connected with a reboiler.

[0031] Among them, the pres...

Embodiment 3

[0033] A kind of refining method of N-methylpyrrolidone product, comprises the following steps:

[0034] The N-methylpyrrolidone (raw material) that needs to be purified and purified is sent to the rectification tower for distillation, the overhead distillate of the rectification tower is subjected to primary condensation, and the gas phase product after primary condensation is subjected to secondary condensation and primary condensation The final liquid phase product is sent to the primary reflux tank, and the gas phase product after the secondary condensing is discharged, the liquid phase product after the secondary condensing is refluxed to the rectification tower through the secondary reflux tank, and the product in the primary reflux tank is partially refluxed To the rectification tower, and at the same time, part of it is recovered as a refined product of N-methylpyrrolidone; the bottom of the rectification tower is connected with a reboiler.

[0035] Among them, the pre...

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Abstract

The invention discloses a refining method of an N-methyl pyrrolidone product. A classifying and condensing system is arranged on the upper portion of an N-methyl pyrrolidone product rectifying tower,and comprises two or more temperature-controllable heat exchangers and corresponding refluxing tanks. The refining method comprises the following specific steps: feeding N-methyl pyrrolidone which requires to be purified into a rectifying tower for distilling; carrying out primary condensing on an overhead product of the rectifying tower; feeding a gas-phase product subjected to primary condensinginto a secondary heat exchanger for condensing; feeding a liquid-phase product subjected to primary condensing into a primary refluxing tank; discharging a gas product subjected to secondary condensing; refluxing a liquid-phase product subjected to secondary condensing to the rectifying tower; and refluxing part of the products in the primary refluxing tank to the rectifying tower, and meanwhileextracting the other part of the products as an N-methyl pyrrolidone refined product. The refining method of an N-methyl pyrrolidone product is low in investment, low in energy consumption and easy tooperate, and free amines and light impurities are removed simply and effectively to obtain the high-quality N-methyl pyrrolidone product.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for refining an N-methylpyrrolidone product. Background technique [0002] Pyrrolidone is a product category widely used in solvent, chemical, pharmaceutical and other industries, including N-methylpyrrolidone (NMP) and N-ethylpyrrolidone (NEP), among which NMP and NEP are both highly selective and stable Good polar solvent, with moderate boiling point, high flash point, low toxicity and strong solubility; Vinylidene fluoride, etc.), lithium-ion battery electrode auxiliary materials, photoresist remover, LCD liquid crystal material production, cleaning of circuit boards in the semiconductor industry, etc.; NEP can be used in medicine, high-grade solvents and other industries. [0003] Taking N-methylpyrrolidone as an example, the existing preparation method of pyrrolidone is: use γ-butyrolactone and methylamine (40%) to carry out thermal condensati...

Claims

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Application Information

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IPC IPC(8): C07D207/267
CPCC07D207/267
Inventor 宋国全黄龙杨理肖强方飞吴正岭吴彦彬闫广学
Owner MAIQI CHEM CO LTD
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