Novel synthesis of ε-caprolactam from cyclohexanone-oxime via beckmann rearrangement over mesoporous molecular sieves MCM-48

Tunghai University Institutional Repository > 理學院 > 化學系所 > 期刊論文 > Item 310901/21237

Please use this identifier to cite or link to this item: http://140.128.103.80:8080/handle/310901/21237

Title:	Novel synthesis of ε-caprolactam from cyclohexanone-oxime via beckmann rearrangement over mesoporous molecular sieves MCM-48
Authors:	Chang, J.-C., Ko, A.-N.
Contributors:	Department of Chemistry, Tunghai University
Keywords:	ε-Caprolactam;Beckmann rearrangement;Cyclohexanone-oxime;MCM-48
Date:	2004
Issue Date:	2013-05-14T09:03:48Z (UTC)
Abstract:	Vapor-phase synthesis of ε-caprolactam (ε-C) from cyclohexanone-oxime (CHO) has been studied at 1 atm and 300-400°C using SiMCM-48 and AlMCM-48(X) with Si/Al molar ratios X in a fixed-bed, continuous flow reactor. The catalysts were characterized with ICP-AES, XRD, TEM, FT-IR, N 2-adsorption, 27A1 and 29Si MAS NMR and TPD of ammonia. An increase of X value in AlMCM-48(X) enhances both the BET surface area and the unit cell parameter but diminishes the acid amount. In the reaction of CHO, benzene, toluene, ethanol and 1-hexanol were utilized as solvents. The CHO conversion increases with the reaction temperature, whereas the ε-C selectivity exhibits the opposite trend due to side reactions. The catalyst stability is greatly enhanced by using ethanol and 1-hexanol as the solvents due to their production of water vapor via dehydration. Excellent catalytic performance of AlMCM-48(10) is attained at 1 atm, 350°C and W/Fc 74.6 g h/ mol by using 1-hexanol in the feed; the CHO conversion and the ε-C selectivity exhibit higher than 99% and 90%, respectively, during at least 130 h process time. ? 2004 Elsevier B.V. All rights reserved.
Relation:	Catalysis Today Volume 97, Issue 4 SPEC. ISS., 3 November 2004, Pages 241-247
Appears in Collections:	[化學系所] 期刊論文

Files in This Item:

File	Size	Format
index.html	0Kb	HTML	251	View/Open

Loading...