Batch Extraction Experiments Research Articles

A novel, highly copper(II)-selective chelating hydrophilic ion exchanger based on imidazole modified poly(glycidyl methacrylate)

Anchoring the imidazole ligand bis(imidazo-2-yl)methylaminomethane (bimam) onto poly(glycidyl methacrylate-co-trimethylpropane trimethacrylate)(pGMT) by a ring-opening reaction of the pendant epoxy group with the secondary amine group of the ligand, results in a novel hydrophilic resin, which contains 0.59 mmol of the ligand per gram of resin; the ligand binding and the resin structure have been characterized by 13C solid-state CP-MAS NMR spectroscopy and elemental analyses; batch extraction experiments show a very high selectivity in the pH range 1.1–6.0 for Cu2+ over Ni2+, Co2+, Zn2+ and Cd2+, as chloride salts in buffered solutions under competitive conditions.

Environmental study of the marinas Part II. A study on the removal of metals from the marinas sediments

Abstract Batch extraction experiments with hydrochloric acid solutions of various concentrations and with different acid‐sediment contact times were carried out on contaminated with heavy metals: sediments from the marinas in the near Athens area. Also, extraction experiments were performed to determine the water soluble fraction of the heavy metal load in the sediments under study. For most metals the extraction capacity of the 30% v/v HCL solution, when in contact with the sediment for 15 min, was found to be most satisfactory. The order of decreasing extraction follows the series: Cd> Ni> Mn> Fe> Cu> Pb> Zn> Cr The metal quantities extracted generally show fluctuations with both acid concentrations and time of equilibration and this phenomenon is more intense for the metals lead, nickel, iron, cadmium. The equilibration of sediment with seawater and distilled water does not seem to affect much the metals present in the solid phase, indicating a very poor metal extraction.

Separation of tocopherols from deodorizer condensates by countercurrent extraction with carbon dioxide

The possibility of enriching tocopherols from deodorizer condensates in a countercurrent separation process with supercritical carbon dioxide as solvent has been investigated. In order to obtain separation factors, phase equilibria were measured. Favorable conditions for separation were determined by conducting batch extraction experiments. Separation under steady state conditions was investigated through countercurrent operation of the separation column. Both sets of separation experiments provided information on the distribution of components of low concentration, which is difficult to obtain from equilibrium measurements only. Experiments on phase equilibria and separation behavior were carried out with mixtures of varying fatty acids and tocopherol content to generate information over different concentration ranges.

Role of Fe in Extractive Decontamination of Pb-Polluted Soils

ABSTRACT The role of Fe in Pb solubilization by ethylenediamirtetetraacetic acid (EDTA) and nitrilotriacetic acid (NTA) from a highly contaminated (21% Pb by weight) battery reclamation site soil was investigated using batch extraction and sequential fractionation experiments. Based on relative complexing ability, soluble Fe(III) should inhibit Pb recovery using chelating agents, particularly under acidic conditions. Despite a large pool of available Fe (6.7% of soil by weight) and a marked increase in soluble Fe(III) with decreasing pH, Pb solubilization was nearly pH invariant. Since only 12% of FeT compared to 86% of PbT was solubilized by 4 × 10−2 M EDTA at pH 6, Pb and Fe apparently exist in differentially reactive forms within the soil. A nine-step chemical fractionation procedure confirmed that 80% of the soil Pb was present in non-detrital (soluble, weakly sorbed) forms in contrast to 94% of Fe existing in detrital (oxide occluded, residual) fractions. The kinetically slow dissolution of indigenou...

Enhanced permeation of hydrocarbons through liquid membranes by lipophilic surfactants.

Batch extraction experiments on liquid membrane permeation were conducted in a stirring vessel to separate aromatics from five-component hydrocarbon mixtures in the presence of lipophilic surfactants added in solvent phase. The lipophilic surfactants served to make emulsion drops smaller and enhanced the permeation rates of each permeate greatly. As the results of the use of a lipophilic surfactant, both a benzene yield of 98 % and a separation factor of 210 for benzene in reference to n-hexane were obtained at 1.5 minutes.