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

K. X. Wang, H. F. Xu, W. S. Li, Chak Tong AU, X. P. Zhou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)168-177
Number of pages10
JournalApplied Catalysis A: General
Volume304
Issue number1-2
DOIs
Publication statusPublished - 10 May 2006

Scopus Subject Areas

  • Catalysis
  • Process Chemistry and Technology

User-Defined Keywords

  • Acetic acid synthesis
  • Carbonylation
  • Carbonylation catalyst
  • Methane oxidative bromination

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