Method for synthesizing and preparing 2-vinyl pyridine

Abstract

The invention relates to a method for synthesizing and preparing 2-vinyl pyridine by synthesizing 2-methyl pyridine and formaldehyde, which comprises the following steps of: adding the raw materials 2-methyl pyridine and formaldehyde (36%) into a high pressure reactor according to the weight ratio of 1: 0.03, stirring and heating for reaction to obtain 2-hydroxyethyl pyridine solution; slowly adding the obtained 2-hydroxyethyl pyridine solution into a dehydration kettle filled with sodium hydroxide (50%) solution through a measuring tank (1 ton) to obtain the crude product 2-vinyl pyridine; and sending the obtained crude product 2-vinyl pyridine into a washing kettle through a pipeline, adding sodium hydroxide (95%) solution into the washing kettle, and carrying out cut fraction on the crude product 2-vinyl pyridine which is separated by washing to obtain the 2-vinyl pyridine with the gas phase chromatography test content of more than 98.5%. The method adopts novel catalyst, so that the unit comprehensive energy consumption is reduced by 20%; the production process is automatically controlled, the product purity is greatly improved, and the product content reaches up to more than 98.5%; and the whole process route is clean and environment-friendly.

Description

technical field

[0001] The invention relates to a preparation method of 2-vinylpyridine, and specifically provides a method for synthesizing 2-vinylpyridine with 2-picoline and formaldehyde. Background technique

[0002] In the prior art, the process route of producing 2-vinylpyridine with 2-picoline as raw material adopts two-step production and batch operation. The temperature required for this process is relatively high, and the pressure required for the reaction is relatively high. , The preparation of the catalyst is complicated and pollutes the environment. Therefore, a new process method is urgently needed to solve the shortcomings of the existing process. Contents of the invention

[0003] The object of the present invention is to aim at the shortcomings and deficiencies in the above-mentioned prior art, and to provide a method for synthesizing and preparing 2-vinylpyridine using 2-picoline and formaldehyde as raw materials and using sodium hydroxide as a catalyst....