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Method for synthesizing N-methylpyrrolidone

A technology of methylpyrrolidone and synthesis method, which is applied in the direction of chemical instruments and methods, molecular sieve catalysts, physical/chemical process catalysts, etc., can solve the problems of reaction temperature, high reaction pressure, long reaction time and high equipment requirements, and achieve the reaction pressure Low, high selectivity, shortened reaction time effect

Active Publication Date: 2011-09-14
MAIQI CHEM CO LTD
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Problems solved by technology

The above-mentioned production method has high reaction temperature and reaction pressure, long reaction time, high requirements on equipment, high energy consumption, and difficult operation

Method used

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Embodiment Construction

[0007] In the present invention, the catalyst is added to the condensation system according to the ratio of 0.01 to 0.5 of the methylamine solution, and the gamma-butyrolactone with a purity of more than 99.0% and the monomethylamine solution are continuously used in a high-pressure metering pump according to a molar ratio of 1:1.0 to 1.4. Into the sleeve reactor for condensation reaction. The pressure is controlled at 4.0-6.0MPa; the temperature is controlled at 180-250°C, and the residence time of the reaction is 0.5-2.5h. The reaction uses nitrogen as the pressure supplement gas source, and the operation process adopts automatic control.

[0008] The pressure of the synthesis system is 5.0~5.5Mpa; the molar ratio of γ-butyrolactone:methylamine is 1:1.0~1.4, and the optimum control range is 1:1.1~1.2; the reaction temperature of the synthesis system is 180~250°C, the optimum It is best controlled at 195-230 ° C; the addition of the new ZSM molecular sieve composite rare eart...

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Abstract

The invention provides a method for synthesizing N-methylpyrrolidone, which is a method for producing a heterocyclic compound, solves the deficiency existing in other technologies. The method is to add a catalyst into a condensation system according to 0.01 to 0.5 of a methylamine solution, and continuously pump gamma-butyrolactone with purity over 99.0 percent and the methylamine into an extension type reactor by a high-pressure metering pump according to mol proportion of 1:1.0-1.4 to carry out a condensation reaction, wherein the pressure is controlled of between 4.0 and 6.0MPa; the temperature is controlled of between 180 and 250 DEG C; retention time of the reaction is between 0.5 and 2.5 hours; the reaction uses nitrogen as a pressure supplyment air source, and the operating processadopts automatic control. The method has the advantages of high conversion ratio of the gamma-butyrolactone and high selectivity of the target product N-methylpyrrolidone.

Description

1. Technical field: [0001] The invention relates to a production method of heterocyclic compounds, in particular to a synthesis method of N-methylpyrrolidone. 2. Background technology: [0002] The conversion rate of γ-butyrolactone in the traditional production method of N-methylpyrrolidone is low, the selectivity of the target product N-methylpyrrolidone is also low, and the impurities are high. Patent CN1054843C introduces a production method of N-methylpyrrolidone, the reaction pressure is 5-10Mpa, the temperature is 200-300°C, the reaction residence time is 0.5-5h, and the conversion rate of γ-butyrolactone is not mentioned. Patent CN1043758C provides a production method of N-methylpyrrolidone, the reaction pressure is 5.5-7Mpa, the temperature is 200-320°C, and the reaction residence time is 0.5-5h. The above-mentioned production method has high reaction temperature and high reaction pressure, long reaction time, high requirements on equipment, high energy consumption...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D207/267B01J29/06
Inventor 肖强宋国全杨理崔炳春
Owner MAIQI CHEM CO LTD
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