Dissolution of Metal Oxides in a Choline Chloride–Sulphosalicylic Acid Deep Eutectic Solvent

Theoretical Foundations of Chemical Engineering - A choline chloride–sulfosalicylic acid deep eutectic solvent (DES) is proposed for dissolving the oxides Co(II), Cu(II), Zn(II), Fe(III),...     

Extraction of monocarboxylic acids by trioctylmethylammonium di(2-ethylhexyl)phosphate

The laws of the interphase distribution of saturated monocarboxylic acids in the system with the binary extracanttrioctylmethylammonium di(2-ethylhexyl)phosphate were studied. The extraction isoherms of monocarboxylic acids by 0.2 M solution of trioctylmethylammonium di(2-ethylhexyl)phosphate in toluene were obtained, and it was shown that they are rectilinear. The extractibility of acids decreases in the following order: butyric > propionic > formic> acetic> lactic, which corresponds to the anion-exchange order for the initial salts of quaternary ammonium bases. The mechanisms of the distribution of monocarboxylic acids were proposed. The study of the extraction of acetic and propionic acids as a function of the acidity of the aqueous phase revealed that the acids are extracted most efficiently from acid solutions. A decrease in the distribution coefficients with an increasing pH of the aqueous phase is observed, which indicates the possibility of efficient reextraction of monocarboxylic acids from organic solutions.     

Pulsation cyclic liquid-liquid chromatography

This article considers new methods of liquid-liquid chromatography with one phase retained in a free state in a spiral column during the second phase pumping through it by imparting liquids with alternate motion. At that, compared with the known methods, the instrumentation of extraction-chromatographic separation of the components mixture becomes much easier and less expensive. The retention of the stationary phase in a spiral pulsation-chromatography column has been experimentally investigated. The results of experiments and calculations prove the prospectiveness of pulsation-cyclic liquid chromatography.     

Extraction of lactic acid from technological (concentrated) solutions

The extraction of lactic acid from technological solutions by different extracting agents and their mixtures was studied. It was established that the most effective extraction of lactic acid is reached in systems with mixtures of trioctylamine and tributyl phosphate. The reextraction of lactic acid from the organic phase is performed by water.     

Extraction of Fe(III), Zn(II), and Mn(II) Using a System with a Green Solvent for Trioctylmethylammonium Thiocyanate

Theoretical Foundations of Chemical Engineering - An environmentally friendly solvent, namely, polypropylene glycol 425, has been proposed for the extraction of metal ions from chloride solutions...     

Liquid–Liquid Equilibrium in an Extraction System Based on Polyvinylpyrrolidone-3500 and Sodium Nitrate

Theoretical Foundations of Chemical Engineering - Liquid–liquid phase equilibrium for a new extraction system based on polyvinylpyrrolidone-3500 and sodium nitrate at 298.15, 313.15, and...     

Extraction of Cu(II), Ni(II), and Al(III) with the Deep Eutectic Solvent D2EHPA/Menthol

Theoretical Foundations of Chemical Engineering - A new hydrophobic deep eutectic solvent (HDES) based on di(2-ethylhexyl)phosphoric acid and menthol has been proposed for the extraction of...     

Studying the Kinetics of Mass Transfer in the Distillation of Water Hydrogen Isotopes in the Presence of Urea

Theoretical Foundations of Chemical Engineering - The efficiency of mass transfer in the separation of hydrogen isotopes by water distillation in the presence of urea as a separating agent has been...     

Extraction of Iron(III) Chloride Complexes Using the Polypropylene Glycol 425–NaCl–H2O System

Theoretical Foundations of Chemical Engineering - The results of experimental investigation of the interphase distribution of iron(III) in an environmentally friendly aqueous two-phase system based...     

Interphase Distribution of Thiophene,Toluene, and o-Xylene in the Hexane–Polymer–Water Extraction System

Theoretical Foundations of Chemical Engineering - The extraction of sulfur-containing and aromatic compounds from light hydrocarbons using water-soluble polymers has been studied experimentally and...