A catalytic synthesis method of N-vinyl pyrrolidone

The catalyst is prepared by liquid phase catalytic synthesis method and azeotropic distillation tower, combined with acetylene absorption and ethyleneization reaction under low temperature and high pressure conditions, and the problems of insufficient catalyst activity and low reaction efficiency in the existing NVP production process are solved, achieving efficient, low-cost and high-quality NVP synthesis.

CN119735537APending Publication Date: 2025-04-01SHANGHAI DIYANG CHEMICAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202510252228.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-05
Publication Date
2025-04-01

AI Technical Summary

Technical Problem

The existing NVP production processes have problems such as insufficient catalyst activity, low reaction efficiency, low acetylene solubility, high equipment cost and unstable product quality.

Method used

The liquid phase catalytic synthesis method is used to prepare a low water content 2-PY potassium salt catalyst through an azeotropic distillation tower, and acetylene absorption and ethyleneization reaction are carried out under low temperature and high pressure conditions, and the reaction efficiency is improved by using the adiabatic reactor and filler bed design.

Benefits of technology

It significantly improves the catalyst activity and reaction efficiency, reduces the generation of by-products, improves the purity and stability of NVP products, reduces production costs, and is suitable for large-scale industrial production.

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Abstract

The present invention relates to the technical field of catalytic organic synthesis, and in particular to a catalytic synthesis method of N-vinylpyrrolidone, including: 2-pyrrolidone or caprolactam is mixed with a KOH aqueous solution and then enters a distillation tower, azeotropic dehydration is performed, and a low-moisture catalyst liquid is obtained; acetylene is dissolved and absorbed, and the catalyst liquid and the ethylene reactor circulating liquid are sent to the top of the absorption tower together, and the acetylene is reversely contacted, and the acetylene is dissolved and absorbed in the catalyst liquid reactor circulating liquid and sent to the reaction; after the absorption tower bottom liquid is heated, it reacts in liquid phase to generate NVP, and the reaction liquid is partially circulated to the absorption tower, and partially enters the distillation system for purification, and finally obtains the NVP product. Compared with the prior art, the present invention solves the problems of high catalyst water content, low activity, low reaction efficiency, high equipment cost, many side reactions, unstable product quality, etc. in the existing NVP production process, and realizes efficient, low-cost, high-quality NVP synthesis, which has industrial application value.
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