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Method for synthesizing and preparing 2-vinyl pyridine

A vinylpyridine and picoline technology, which is applied in the field of preparation of 2-vinylpyridine, can solve the problems of complicated catalyst preparation, polluted environment and high temperature, and achieves a clean and environmentally friendly process route, high safety performance and improved product purity. Effect

Inactive Publication Date: 2013-01-09
沙文茜
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Problems solved by technology

[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, so there is an urgent need for a new process to solve the shortcomings of the existing process

Method used

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Embodiment

[0019] Take the raw material 2-picoline and formaldehyde (36%) and put them into the autoclave in a ratio of 1:0.03 by weight, stir, gradually heat up to 160°C, keep the pressure at 0.5Mpa, and time the reaction. After 1 hour, transport In the accepting kettle, obtain 2-hydroxyethylpyridine solution; By the obtained 2-hydroxyethylpyridine solution, add sodium hydroxide (50%) solution (100 kilograms) to the dehydration kettle through metering tank (1 ton) Slowly add in, keep the temperature at 90°C, react for 5 hours to obtain the crude product 2-vinylpyridine, send the crude product 2-vinylpyridine to the washing kettle through pipeline, add sodium hydroxide (95%) solution (75 kg), Carry out washing and separation for 5 hours; send the crude product 2-vinylpyridine after washing and separation to a rectification kettle through pipelines for fractionation, keep the temperature at 90°C, and rectify for 4 hours. Qualified crude products are put into receiving tanks for dehydratio...

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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....

Claims

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Application Information

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IPC IPC(8): C07D213/16C07D213/127
Inventor 沙文茜
Owner 沙文茜
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