- Carboxylate-assisted formation of alkylcarbonate species from co 2 and tetramethylammonium salts with a β-amino acid anion
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Tetramethylammonium-based molten salts bearing a β-amino acid anion (TMAAs) are synthesized through Michael addition reactions of amines with methyl acrylate followed by hydrolysis and subsequent neutralization by using aqueous tetramethylammonium hydroxide. The CO2 capture performances of the TMAAs are evaluated and are shown to interact with CO2 in a 1:1 mode in both water and alcohol. FTIR and 13C NMR spectroscopic studies on the interactions of TMAAs with CO2 indicate that the type of CO 2 adduct varies with the solvent used. When water is used as the solvent, a bicarbonate species is produced, whereas hydroxyethylcarbonate and methylcarbonate species are generated in ethylene glycol and methanol, respectively. Computational calculations show that the carboxylate groups of TMAAs contribute towards the formation and stabilization of 1:1 CO2 adducts through hydrogen bonding interactions with the hydrogen atoms of the amino groups.
- Hong, Sung Yun,Cheon, Youngeun,Shin, Seung Hoon,Lee, Hyunjoo,Cheong, Minserk,Kim, Hoon Sik
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p. 890 - 897
(2013/07/27)
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- Process for producing a high purity quaternary ammonium hydroxide
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A process for production of high purity quaternary ammonium hydroxides, comprising electrolyzing quaternary ammonium hydrogencarbonates represented by the general formula: (wherein the symbols are as defined in the appended claims) in an electrolytic cell comprising an anode compartment and a cathode compartment defined by a cation exchange membrane. In accordance with this process, high purity quaternary ammonium hydroxides can be produced with high electrolytic efficiency and further without causing corrosion of equip-ment. Since the quaternary ammonium hydroxides produced by the present invention are of high purity, they can be effectively used as, for example, cleaners, etchants or developers for wafers in the production of IC and LSI in the field of electronics and semiconductors.
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