Extractive Separation of Co/Ni Pair With the Deep Eutectic Solvent Aliquat 336/Timol

Theoretical Foundations of Chemical Engineering - This paper presents the results of a study of the physical properties of a hydrophobic deep eutectic solvent (HDES) based on Aliquat 336 and...     

Extraction and separation of carboxylic acids by liquid-liquid extraction and chromatography

The possibilities of using the extraction and extraction-chromatographic methods to solve the problem of the recovery and separation of carboxylic acids are investigated.     

Columns for cyclic extraction-chromatographic device

Three constructions of the columns of extraction-chromatographic device operating in cyclic mode have been compared. Experiments have been conducted with = shots containing caffeine, coumarin, and salicylic and acetylsalicylic acids using hexane-isopropyl alcohol-water biphase solvent system at a 1 : 1 : 1 ratio, respectively. All columns have demonstrated fairly high effectiveness. The certain advantage of the column with stirrers is the possibility to control contact time of phases.     

Analysis of the process of the countercurrent cyclic chromatography

Cyclic countercurrent chromatography, a new method of liquid chromatography, has been considered. A mathematical model of a cyclic process has been developed. Each cycle consists of two half-periods, i.e., a half-period of the motion of a light phase (a heavy phase plays a role of an immobile phase) and a half-period of the motion of a heavy phase (a light phase plays a role of an immobile phase). Sampling is introduced in the form of a pulse into the average zone of a system of sequentially connected equilibrium steps into the half-period of the motion of the light phase of the initial process cycle. Analytical dependences for calculating the cyclic processes of the countercurrent chromatography have been derived. The experiment and the theory are correlated, and satisfactory agreement between the experimental results and computational investigations has been established.     

Analysis of the possible applications of the acoustic flow effect for the breakup and transfer of liquid substances in a cylindrical volume

Theoretical Foundations of Chemical Engineering - The conditions for the existence of an acoustic flow effect excited in a cylindrical liquid volume by the radial oscillations of its walls within...     

Extraction separation of the components of leach liquors of batteries

Theoretical Foundations of Chemical Engineering - Waste batteries contain toxic metals (Pb, Ni, Zn, Fe, etc.) in high concentrations. In order to prevent harmful effects on human health and...     

Extraction of Monocarboxylic Acids from Diluted Solutions with Polyethylene Glycol

Theoretical Foundations of Chemical Engineering - An aqueous two-phase system based on polyethylene glycol-1500 and sodium sulfate for the extraction of a number of monocarboxylic acids from...     

Interphase Distribution of V(IV) in the Polyethylene Glycol 1500–Sodium Nitrate–Water System

Theoretical Foundations of Chemical Engineering - A study has been made of the interphase distribution of V(IV) ions in a nitrate system with polyethylene glycol 1500. The dependences of the...     

Extractive denitrogenization of liquid model fuel using polyethylene glycol methyl ether 350

In the present study, we studied the effectiveness of the water-soluble polymer polyethylene glycol methyl ether 350 (PEG ME-350) on the extraction of nitrogen-containing heterocyclic compounds—quinoline and indole—from n-hexane. The dependences of the quantitative characteristics of the extraction of N-compounds on the contact time of the phases, the content of PEG ME-350 in the n-hexane–water system, the initial concentration of nitrogen-containing heterocyclic compounds in the organic phase, and the volumetric ratio of the phases were obtained. It has been established that PEG ME-350 is an effective extractant in the process of stepwise extraction of quinoline and indole, and the mechanisms of their extraction have also been proposed and proven. The results can be further used in the purification of light hydrocarbon fractions from nitrogen-containing heterocyclic compounds.     

Extraction of Lactic Acid Using the Polyethylene Glycol–Sodium Sulfate–Water System

Theoretical Foundations of Chemical Engineering - An extraction system based on polyethylene glycol 1500 and sodium sulfate for extracting lactic acid from aqueous solutions is proposed. The...