Method for preparing 3-methylpyridine

• Main Authors: ZENG HUI, ZHOU AIMIN, LI WENBING, WANG JUN, DAI SHUNKUN, WEI YONGFEI
• Format: Patent
• Language: Chinese; English
• Published: 10.05.2017
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HETEROCYCLIC COMPOUNDS; METALLURGY; ORGANIC CHEMISTRY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention provides a method for preparing 3-methylpyridine. The method includes adding a rare earth catalyst into a tubular reactor filled with molecular sieve, respectively heating 2-methylpyrrolidine, trichloromethane and water vapor to 160-200 DEG C, mixing the heated 2-methylpyrrolidine, the heated trichloromethane and the heated water vapor in a specific ratio, feeding nitrogen for dilution prior to pressurization, feeding a diluted mixed gas into the tubular reactor, separating through a cooling tower and rectifying so as to obtain the 3-methylpyridine and the 2-methylpyrrolidine. The method has the advantages of easily available raw materials, short reaction route, simplicity and convenience in operation, high product yield, reusability of the rare earth catalyst after activating treatment and lower production cost, thereby being high in industrialized mass production application value. 本发明提供了种3-甲基吡啶的制备方法，是将稀土催化剂加入到装有分子筛的管式反应器中，然后将2-甲基吡咯、三氯甲烷、水蒸汽分别加热至160-200℃，按比例混合，向其中通入氮气稀释，加压，将稀释后的混合气通入管式反应器，然后通过