Recovery of Methacrylic Acid from the Aqueous Phase Using Trioctylmethylammonium Chloride (TOMAC) in Different Diluents

Abstract

Methacrylic acid and its derivatives are used in the manufacture of important industrial polymeric products. They have a variety of industrial applications including plastics, thickening agents, surfactants, and chelating agents, etc. In the present work, equilibrium extraction of methacrylic acid is carried out to recover it from aqueous solution. A quaternary ammonium salt, trioctylmethylammonium chloride (TOMAC), is used along with different diluents which belong to different categories. These include isoamyl alcohol, n-butyl acetate, methyl isobutyl ketone (MIBK), toluene, carbon tetrachloride, rice bran oil, and kerosene. Parameters such as distribution coefficients, extraction efficiency, loading ratio, stoichiometric loading ratios, and the equilibrium complexation constants are reported. In both physical and chemical extraction processes, MIBK, being proton−accepting, provides maximum extraction efficiency. The values of equilibrium complexation constant of the TOMAC−diluent systems studied decrease in the following order: rice bran oil > carbon tetrachloride > butyl acetate > toluene > kerosene > MIBK > isoamyl alcohol.

Selective extraction of 1,3‐propanediol by phenylboronic acid‐based ternary extraction system

“…The extraction efficiency of both 1,3‐PDO and glycerol was significantly improved with increasing amount of A336. It was shown earlier that increasing the concentration of co‐extractant (A336) improved extraction efficiency in the separation of methacrylic acid 33 and pyridine‐3‐carboxylic acid 34 . Considering the cost and the problem that excess A336 could not be dissolved in the diluent, further refinement of its dosage needs to be explored.…”