Process for purifying crude pyridine
By gas-phase reaction and distillation of crude pyridine with air in the presence of an oxidation catalyst, the problems of low pyridine purification efficiency and cumbersome operation in the existing technology are solved, and continuous large-scale production of high-purity pyridine and simplified catalyst preparation are achieved .
CN101337923AActive Publication Date: 2009-01-07ANHUI COSTAR BIOCHEM CO LTD
2 Cites 6 Cited by
Patent Information
- Application Number
- CN200810124678.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2008-08-29
- Publication Date
- 2009-01-07
- Estimated Expiration
- 2028-08-29
AI Technical Summary
Technical Problem
Existing pyridine purification methods have shortcomings in efficiency and simplicity of operation, making them difficult to apply to continuous large-scale production.
Method used
By performing a gas-phase reaction of crude pyridine with air in the presence of an oxidation catalyst, followed by distillation, impurities are oxidized and separated using an oxidation catalyst such as an alumina-supported vanadium catalyst to obtain 99.9% high-purity pyridine.
Benefits of technology
It achieves simple operation and can obtain high-purity 99.9% pyridine in continuous large-scale production, simplifying the catalyst preparation process.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention discloses a purification method of a crude pyridine. The crude pyridine is mixed with air according to the molar ratio that is 1:50 to 150 after evaporization, and passes through oxidation catalyst for reaction in the gas-phase space velocity of 300 to 1000h<-1> under the temperature that is 250 to 400 DEG C, the rectification is performed after the reaction, the distillation cut of 115.5 DEG C is collected under the normal atmosphere, and then pure pyridine is obtained. The purification method has simple operation, can obtain high-purity pyridine with the content of 99.9 percent, and can be used in continuous large-scale production.
Need to check novelty before this filing date? Find Prior Art