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System for synthesizing N-methyl-2-pyrrolidone

A technology of methylpyrrolidone and degassing tower, which is applied in the direction of organic chemistry, can solve the problems of increasing impurities, difficulty in separation and purification, and low yield, and achieve the effects of low investment, simple process flow, and low energy consumption

Inactive Publication Date: 2015-11-25
江苏恒祥化学股份有限公司
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Problems solved by technology

[0003] At present, the industrial production of N-methylpyrrolidone has been disclosed to prepare N-methylpyrrolidone with a yield of 98% by continuously reacting γ-butyrolactone and monomethylamine at 280 ° C and in the presence of a copper ion-exchanged Y-type zeolite catalyst. However, these methods have disadvantages such as low yields, and γ-butyrolactone, which has a small boiling point difference (about 2°C) with the product N-methylpyrrolidone, remains as an unreacted reactant, thus making separation and purification Difficulty and increased impurity

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  • System for synthesizing N-methyl-2-pyrrolidone

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Embodiment Construction

[0014] Such as figure 1 To describe the present invention in detail, a system for synthesizing N-methylpyrrolidone includes a 1,4-butanediol dehydrogenation device, a mixed amine synthesis device and a device for preparing N-methylpyrrolidone.

[0015] The 1,4-butanediol dehydrogenation unit includes a 1,4-butanediol dehydrogenation reactor 1, a first separator 2, a first degassing tower device 3 and a γ-butyrolactone intermediate storage tank 4; 1, 4-butanediol dehydrogenation reactor 1, its right end is provided with a material outlet, and the left end is provided with a material inlet, and the material inlet of 1,4-butanediol dehydrogenation reactor is connected with a material sampling tube; the first Separator 2 has a gas phase outlet at the top, a liquid phase outlet at the bottom, and a material inlet at the middle. The material inlet of the first separator is connected to the right end of the 1,4-butanediol dehydrogenation reactor through a pipeline. The material outl...

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Abstract

The invention relates to a system for synthesizing N-methyl-2-pyrrolidone. The system is characterized by comprising a 1,4-butanediol dehydrogenation device, a mixed amine synthesis device and a N-methyl-2-pyrrolidone preparation device. The system provided by the invention has the advantages as follows: the system is simple in process, and low in energy consumption and input; in addition, multiple circulating exchange among devices is adopted, so that gamma-butyrolactone is completely converted into N-methyl-2-pyrrolidone, separation in a later period is easier, high-purity N-methyl-2-pyrrolidone can be synthesized and the purity can reach 99.9 wt % or above.

Description

technical field [0001] The present invention relates to a system for synthesizing N-methylpyrrolidone, more specifically, it is prepared by a continuous process by dehydrogenating 1,4-butanediol to generate the intermediate product γ-butyrolactone without purification and mixed methylamine A system for high-purity N-methylpyrrolidone production. Background technique [0002] N-methylpyrrolidone is an important chemical raw material. It is a polar solvent with strong selectivity and good stability. It has low toxicity, high boiling point, strong solvency, non-flammable, biodegradable, recyclable, and safe to use. And suitable for a variety of formulation purposes and other advantages. It is widely used as a solvent for polyvinylidene fluoride, an auxiliary electrode material for lithium-ion batteries, desulfurization of syngas, refining lubricating oil, antifreeze for lubricating oil, olefin extractant, solvent for the polymerization of insoluble engineering plastics, agricu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/267
CPCC07D207/267
Inventor 邱志刚
Owner 江苏恒祥化学股份有限公司
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