Process for synthesizing NMP by adopting solid strong acid catalyst

Abstract

The invention discloses a process for synthesizing NMP by adopting a solid strong acid catalyst. The process comprises the following steps that 1, 4-butanediol is preheated by a preheater and then enters a vaporizer to be vaporized; the vaporized gas-phase material enters a heater to be heated and then enters a GBL reactor to react, and the temperature of 180-250 DEG C and the normal pressure condition are controlled under the action of a copper-based catalyst; generated mixed gas of butyrolactone and hydrogen firstly passes through a heat exchanger and then enters a first-stage condenser anda second-stage condenser, one part of hydrogen is emptied, and the other part of hydrogen is sent to a hydrogen cycle by a fan; a gamma-butyrolactone crude product is obtained after condensation,the gamma-butyrolactone crude product is directly fedinto an NMP reactor, and a methylamine solution and a solid strong acid catalyst are added to react to obtain an NMP crude product. The process overcomes the defects in the prior art, can synthesize high-purity NMP, fully utilizes heat energy to achieve the effects of saving energy and reducing consumption, improves the utilization rate of resources,and has higher social use value and application prospect.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a process for synthesizing NMP by using a solid strong acid catalyst. Background technique [0002] The chemical name of NMP is N-methylpyrrolidone (NMP). N-methylpyrrolidone (NMP) is an excellent solvent with high boiling point and environmental protection. It has low viscosity, chemical stability, good thermal stability and high polarity. , low volatility, infinite miscibility with water and many organic solvents and so on. The market application fields of N-methylpyrrolidone are mainly concentrated in industries such as lithium batteries, circuit boards, insulating materials, petrochemicals, pharmaceuticals, pesticides, cleaning, and polymers. [0003] At present, the production of NMP is mainly through the ammoniation reaction of GBL and monomethylamine to produce NMP. Since the ammoniation reaction is a reversible reaction and the reaction conditions are harsh, ...

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Problems solved by technology

[0003] At present, the production of NMP is mainly through the ammoniation reaction of GBL and monomethylamine to produce NMP. Since the ammoniation reaction is a reversible reaction and the reaction conditions are harsh, NMP needs to be generated at a temperature of about 280 ° C. There are many existing NMP reactors. It integrates heating, feeding and reaction. After the reaction material enters the reactor, it reacts at the set temperature. After the material enters, it needs to be heated to the reaction temperature, and there are uneven heating and mixing degree in the rapid heating process. The low phenomenon leads to low reaction product yield and many side reactions, which directly affect the purity and yield of NMP;

[0004] In addition, impurities are often produced in the reaction products. If they are not filtered and purified, the quality of the products will be greatly reduced, and the direct discharge will pollute the environment and cause a huge waste of resources.

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