fulltext.study @t Gmail

Enhancement effect of organic additives on liquid-phase production of ε-caprolactam

Paper ID Volume ID Publish Year Pages File Format Full-Text
52295 46868 2007 4 PDF Available
Title
Enhancement effect of organic additives on liquid-phase production of ε-caprolactam
Abstract

The effect of various organic additives on the catalytic performance of zeolites and Al-containing MCM-41 in the liquid-phase Beckmann rearrangement of cyclohexanone oxime was investigated at 130 °C using benzonitrile as solvent. Over USY zeolite with a large amount of extraframework aluminum (EFAL), the lactam yield was dramatically improved, up to 82%, by adding ethanol, dimethyl sulfoxide, ammonia, diethylamine, or pyridine to the oxime solution. It is due to a selective adsorption of these additives on the detrimental hydrolysis sites as suggested by FTIR results. On the other hand, the additives enhanced both the oxime conversion and the lactam yield through a promotion of the desorption of lactam product from acid sites when beta zeolite and Al-MCM-41 with relatively low EFAL content were used as catalysts.

Keywords
Beckmann rearrangement; Liquid phase; ε-Caprolactam; USY; Additives
First Page Preview
Enhancement effect of organic additives on liquid-phase production of ε-caprolactam
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 8, Issue 2, February 2007, Pages 135–138
Authors
, , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis