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The synthesis of acetic acid from methane via oxidative bromination, carbonylation, and hydrolysis

Paper ID Volume ID Publish Year Pages File Format Full-Text
44500 46034 2006 10 PDF Available
Title
The synthesis of acetic acid from methane via oxidative bromination, carbonylation, and hydrolysis
Abstract

Acetyl bromide and acetic acid (AA) were synthesized from methane by an energy-saving process. By reacting methane with oxygen in the presence of HBr and H2O over a 2.5% Ba 2.5% La 0.5% Ni 0.1% Ru/SiO2 catalyst, methane was converted to CH3Br and CO (CH3Br/CO molar ratio = 1/1) with a CH4 single-pass conversion of 70% at 660 °C. Our results showed that CH3Br was formed via the interaction of methane with bromine radicals whereas CO was generated in the oxidation of CH3Br. Through the carbonylation of CH3Br over RhCl3-KI or RhCl3-PPh3 (triphenyl phosphine) catalyst in propanoic acid, acetyl bromide could be synthesized and readily hydrolysed to acetic acid at room temperature (with more than 99.7% yield based on CH3Br). The promotional action of PPh3 and KI is realized via the direct coordination of PPh3 to Rh and the conversion of CH3Br to CH3I by means of Br–I exchange, respectively.

Keywords
Methane oxidative bromination; Carbonylation; Acetic acid synthesis; Carbonylation catalyst
First Page Preview
The synthesis of acetic acid from methane via oxidative bromination, carbonylation, and hydrolysis
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 304, 10 May 2006, Pages 168–177
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis