Jump to main content
US EPA
United States Environmental Protection Agency
Search
Search
Main menu
Environmental Topics
Laws & Regulations
About EPA
Health & Environmental Research Online (HERO)
Contact Us
Print
Feedback
Export to File
Search:
This record has one attached file:
Add More Files
Attach File(s):
Display Name for File*:
Save
Citation
Tags
HERO ID
1735677
Reference Type
Journal Article
Title
Selective hydrogenation of 1,3-butadiene in mixture with isobutene on a Pd/alpha-alumina catalyst in a serni-batch reactor
Author(s)
Seth, D; Sarkar, A; Ng, FTT; Rempel, GL
Year
2007
Is Peer Reviewed?
Yes
Journal
Chemical Engineering Science
ISSN:
0009-2509
Publisher
Elsevier Science Ltd , Oxford Fulfillment Centre, P.O. Box 800, Kidlington, Oxford, OX5 1DX, UK, [URL:http://www.elsevier.com]
Volume
62
Issue
17
Page Numbers
4544-4557
DOI
10.1016/j.ces.2007.05.029
Web of Science Id
WOS:000249233000004
URL
http://www.sciencedirect.com/science/article/pii/S0009250907004253
Exit
Abstract
Butene isomers (C-4) are obtained in the refinery as by-products of the steam cracking of naphtha and light gas oil. The C-4 isomers contain a large fraction of butadiene. Butadiene is separated from this fraction by extractive distillation to produce a raffinate stream. However, the raffinate stream contains traces of butadiene (up to approximately 1%). For this stream to be used for isooctane production via the dimerization of isobutene and the hydrogenation of isooctene in a catalytic distillation column, the butadiene present in this stream should be removed, as it would otherwise poison the dimerization catalyst. The butadiene present in this stream may be removed by selective hydrogenation. This paper describes a kinetic study of the liquid-phase selective hydrogenation of 1,3-butadiene present in a mixture with isobutene using a Pd/alpha-A1(2)O(3) catalyst in a semi-batch reactor. Experimental results revealed that Pd/alpha-Al2O3 was highly selective for the hydrogenation of butadiene in the presence of isobutene. The catalyst did not show any appreciable deactivation. Hydrogenation of butadiene produced 1- and 2-butenes and n-butane. A very detailed reactor model, incorporating internal diffusion inside the catalyst particles was developed to interpret the experimental results. A kinetic model for the selective hydrogenation on the catalyst was developed by using simplified versions of the Langmuir-Hinshelwood mechanism. The estimated model parameters described the experimental data accurately. The hydrogenation reaction was found to be severely limited by the diffusion rate of hydrogen in the catalyst particle. (C) 2007 Elsevier Ltd. All rights reserved.
Keywords
selective hydrogenation; dynamic simulation; kinetics; mathematical modeling; multiphase reactor; palladium/alpha-alumina
Home
Learn about HERO
Using HERO
Search HERO
Projects in HERO
Risk Assessment
Transparency & Integrity