Continuous condensation process in production process of 2-vinylpyridine

A vinylpyridine and production process technology, applied in the field of continuous condensation technology, can solve the problems of many by-products, low yield, long reaction time, etc., reduce by-products, improve output and reaction yield, save electricity and steam Effect

Inactive Publication Date: 2012-09-19
淄博张店东方化学股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The old process has long reaction time, low yield and many by-products

Method used

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  • Continuous condensation process in production process of 2-vinylpyridine
  • Continuous condensation process in production process of 2-vinylpyridine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Use measuring tank 1 to prepare the mass ratio of 2-picoline and formaldehyde to be 5: 1, material temperature in batching tank 2 is 200°C, pressure is 3Mpa, feed rate is 150L / min, temperature of tubular preheater 3 is 260°C, pressure is 6Mpa. The temperature of the tubular reactor 4 is 240° C., and the pressure is 5 MPa. The discharge temperature was 245°C, and after 4 hours, it was detected that 2-vinylpyridine was 40%, 2-picoline was 58%, and high boilers were 0.4%. Hydroxyethyl production is 3.6 tons.

Embodiment 2

[0019] Use metering tank 1 to prepare the mass ratio of 2-picoline and formaldehyde to be 5:1, material temperature in batching tank 2 is 230°C, pressure is 5Mpa, feed rate is 150L / min, temperature of tubular preheater 3 is 280°C, pressure is 8Mpa. The temperature of the tubular reactor 4 is 260° C., and the pressure is 6 MPa. The discharge temperature was 247° C., detected after 4 hours, 2-vinylpyridine was 39%, 2-picoline was 59%, and high boilers were 0.5%. Hydroxyethyl production is 3.7 tons.

Embodiment 3

[0021] Use measuring tank 1 to prepare the mass ratio of 2-picoline and formaldehyde to be 5:1, material temperature in batching tank 2 is 250°C, pressure is 7Mpa, feed rate is 150L / min, temperature of tubular preheater 3 is 300°C, pressure is 9Mpa. The temperature of the tubular reactor 4 is 280° C., and the pressure is 7 MPa. The discharge temperature was 243° C., detected after 4 hours, 2-vinylpyridine was 41%, 2-picoline was 57%, and high boilers were 0.3%. Hydroxyethyl production is 3.6 tons.

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Abstract

The invention relates to a continuous condensation process in the production process of 2-vinylpyridine. The continuous condensation process in the production process of the 2-vinylpyridine is characterized by comprising the following steps: 2-methylpyridine and formaldehyde are thrown into a measuring tank and then conveyed to a preparation slot, enter a tubular preheater through the preparation slot, and arrive in a tubular reactor after being preheated, wherein the mass ratio of the 2-methylpyridine to the formaldehyde is 5:1. By adoption of the continuous feeding method, reaction time is shortened, electric power and steam are saved, yield and reaction yield are increased, byproducts are reduced, and environmental pollution is reduced because the byproducts are harmful to the environment.

Description

technical field [0001] The invention relates to a continuous condensation process in the production process of 2-vinylpyridine, which belongs to the field of chemical industry. Background technique [0002] The purpose of the condensation reaction is to produce 2-hydroxyethylpyridine, which is the first step in the production of 2-vinylpyridine. The old process: batch reaction, producing a batch of materials (about 6 tons), the cycle is about 6-7 hours, of which, the feeding time is about 45-50 minutes, the heating time is about 60-80 minutes, and the feeding time is about 60 minutes. The reaction temperature is 180° C., the reaction yield is about 93%, and about 4% by-product tar (high boiling matter, which is a waste product and has great pressure on environmental protection) is produced during this period. [0003] The old process has long reaction time, low yield and many by-products. Contents of the invention [0004] According to the deficiencies of the prior art, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D213/16C07D213/127
Inventor 王宝庆仇传禄孙光福王刚孔凡平
Owner 淄博张店东方化学股份有限公司
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