Removing hydrocarbon impurities from acetic acid by ionic...

Details Removing hydrocarbon impurities from acetic acid by ionic... Removing hydrocarbon impurities from acetic acid by ionic...

2008-05-07

2010-10-12

Shiao, Rei-tsang (Department: 1628)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

Reexamination Certificate

active

07812191

ABSTRACT:
A method for removing hydrocarbon impurities from acetic acid is disclosed. The method comprises extracting acetic acid with a hydrophilic imidazolium salt. The imidazolium salt preferably has the general structure ofwherein XΘis a counter ion and R1, R2, R3, R4, and R5are independently selected from the group consisting of C1-C6hydrocarbon substitutes. The method is useful for removing hydrocarbon impurities from the alkane distillation bottoms stream of a methanol carbonylation process.

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Matsumoto M. et al. :Extraction of organic acids using imidazolium-based ionic liquids and their toxicity to Lactobacillus rhamnosus, Separation and Purification Technology, Elsevier Science, Amsterdam, NL, vol. 40, No. 1, Nov. 15, 2004, pp. 97-101, XP004558244, ISSN: 1383-5866, Figure 1; Table 1.
Huddleston, J.G. et al.:Characterization and Comparison of Hydrophilic and Hydrophobic Room Temperature Ionic Liquids Incorporating the Imidazolium Cation, Green Chemistry, Royal Society of Chemistry, Cambridge, GB, vol. 3, No. 4, Jan. 1, 2001, pp. 156-164, XP009073032, ISSN: 1463-9262, pp. 157-158, Table 2.

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