Method for preparing 2-vinylpyridine

Abstract

The invention provides a method for preparing 2-vinylpyridine. The 2-vinylpyridine is mainly prepared from 2-picoline and formaldehyde. The process for synthesizing the 2-vinylpyridine comprises 'two-step' and 'one-step' production processes, and comprises the steps of condensing 2-picoline and formaldehyde to produce hydroxyethyl pyritine; and dehydrating the hydroxyethyl pyritine at a certain temperature in the action of a catalyst to generate the 2-vinylpyridine. The 'one-step' production process is adopted, 2-vinylpyridine is further generated at a certain temperature under the action of an acid catalyst by adopting 2-picoline and formaldehyde as raw materials, the process flow is simple, the yield is high, and the consumption of raw materials, auxiliary materials and energy of the 'one-step' method is superior to those of the 'two-step' method.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a preparation method of 2-vinylpyridine. Background technique [0002] 2-Vinylpyridine is not only used for the synthesis of widely used butylpyridine (butadiene pyridine) latex, but also for the modification of other polymer materials, ion exchange resins, printing and dyeing auxiliaries, pharmaceutical synthesis, etc. It is mainly produced in state-owned Japan, the United States , India, China, etc. At present, the domestic 2-vinylpyridine is a "two-step" synthesis process. This process is very mature in my country. Zibo Zhangdian Dongfang Chemical has a patent report. Its synthesis route is the condensation of 2-picoline and formaldehyde to produce hydroxyethyl Hydroxyethylpyridine is dehydrated at a certain temperature and under the action of a catalyst to generate 2-vinylpyridine. However, the process route is complicated, the energy consumption is large, and a l...

AI Technical Summary

Problems solved by technology

At present, the domestic 2-vinylpyridine is a "two-step" synthesis process. This process is very mature in my country. Zibo Zhangdian Dongfang Chemical has a patent report. Its synthesis route is the condensation of 2-picoline and formaldehyde to produce hydroxyethyl Hydroxyethylpyridine is dehydrated at a certain temperature and under the action of a catalyst to generate 2-vinylpyridine. However, the process route is complicated, the energy consumption is large, and a large amount of waste residue and waste lye are produced at the same time, which is seriously unfavorable to the current environmental protection requirements and enterprise production. efficiency