Encyclopedia of Membranes

Living Edition
| Editors: Enrico Drioli, Lidietta Giorno

Acetic Acid Dehydration by Pervaporation on Charged Membranes

Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-40872-4_2126-1
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Acetic acid is produced both synthetically and biologically. The synthetic production typically uses the Monsanto process, which is also known as methanol carbonylation for acetic acid synthesis. About 75 % of acetic acid in the chemical industry is produced by this process, in which carbon monoxide reacts with methanol under influence of a rhodium complex catalyst at 180 °C and pressure of 30–40 atm (Shen et al. 2011). The main challenges in acetic acid and water separation are (1) cost minimization and (2) optimizing separation efficiency. In acetic acid aqueous solutions, there is a dynamic equilibrium between neutral molecules and the acetate and hydronium ions. It was observed that acetic acid dissociation is not only driven by the breaking of H-bonds connecting the ions but also triggered by a solvent reorganization around the proton-accepting water (Park et al. 2006), as illustrated in Scheme 1. Water molecule forms four hydrogen bonds, whereas a hydronium ion only forms three....
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References

  1. Park JM, Laio A, Iannuzzi M, Parrinello M (2006) Dissociation mechanism of acetic acid in water. J Am Chem Soc 128:11318–11319CrossRefGoogle Scholar
  2. Semenova SI, Ohya H, Soontarapa K (1997) Hydrophilic membranes for pervaporation: an analytical review. Desalination 110:251–286CrossRefGoogle Scholar
  3. Shen Z, Zhou J, Zhou X, Zhang Y (2011) The production of acetic acid from microalgae under hydrothermal conditions. Appl Energy 88:3444–3447CrossRefGoogle Scholar

Authors and Affiliations

  1. 1.School of Bioprocess EngineeringUniversiti Malaysia Perlis (UniMAP)ArauMalaysia