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NMP pervaporation dehydration method

A technology of pervaporation and permeate, applied in the field of high-purity NMP production, can solve the problem that purification research needs to be further strengthened.

Inactive Publication Date: 2021-02-19
HYMATER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few domestic literature reports on the content of purification, and the research on the purification of NMP needs to be further strengthened

Method used

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  • NMP pervaporation dehydration method

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Embodiment Construction

[0011] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0012] The invention provides a method for NMP pervaporation dehydration, comprising: preheating the NMP raw material containing water at a mass flow rate of 1200±100kg / batch and then entering the first storage tank; The permeate enters the permeate treatment unit; the retentate of the primary dehydration enters the second storage tank, and continues to be circulated to the membrane separation unit for secondary dehydration, and the retentate of the secondary dehydration enters the first storage tank. When it is detected that the retentate contains water When the rate meets the product requirements, the NMP product is mined. Wherein, in order to ensure product quality, in the above-mentioned method for NMP pervaporation dehydration of the present invention, the mass percentage of water in the water-containing NMP ra...

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Abstract

The invention provides an NMP pervaporation dehydration method which comprises the following steps: preheating a water-containing NMP raw material at the mass flow rate of 1200+ / -100kg / batch, feedingthe preheated water-containing NMP raw material into a first storage tank, feeding the buffered raw material into a membrane separation unit for primary dehydration, and feeding permeate into a permeate treatment unit; and enabling the primarily dehydrated retentate to enter a second storage tank, continuously and circularly conveying the primarily dehydrated retentate to the membrane separation unit for secondary dehydration, enabling the secondarily dehydrated retentate to enter the first storage tank, and extracting an NMP product when the moisture content of the retentate is detected to meet the product requirements. When the method is used for dehydrating and refining the NMP, the membrane separation process is realized by adopting liquid feeding, so that the NMP dehydration process is prevented from being vaporized again, the energy consumption is greatly reduced, and the problem of product denaturation and deterioration caused by repeated heating of the NMP is avoided; and intermittent or continuous dehydration operation modes can be flexibly selected according to different treatment capacities and different water contents of the waste NMP solvent, switching is flexible, andoperation is convenient.

Description

technical field [0001] The invention relates to the field of high-purity NMP production, in particular to a method for NMP pervaporation dehydration. Background technique [0002] NMP is an abbreviation for N-methylpyrrolidone. N-methylpyrrolidone (NMP) is an organic solvent with many advantages such as low toxicity, high boiling point, low volatility, strong solubility, and stable chemical properties. High-purity NMP products are widely used in lithium batteries, carbon nanotube conductive paste, liquid crystal electronics, semiconductors, insulating materials and other industries. With the rise and rapid development of the lithium battery industry, the demand for high-purity NMP in power batteries, energy storage batteries and other fields is increasing. In the production process of lithium batteries, high-purity NMP greatly affects the quality and effect of coating and the improvement of energy density of lithium batteries. In the batching stage, as a PVDF solvent, it ...

Claims

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Application Information

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IPC IPC(8): C07D207/267
CPCC07D207/267
Inventor 李伟李辉张伟李砚硕
Owner HYMATER CO LTD
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