Extraction Chemistry Research Articles

The chemistry of coffee extraction in relation to polysaccharides

Abstract Technically produced extracts from roasted Arabica and Robusta coffees contain, just like the infusions prepared in the home, 20–36% carbohydrates, depending on the degree of extraction. They are composed predominantly of mannan and galactan in about the same proportions, the share of glucan and araban making up only 1–3% of the extracts. With dialysis a group of polysaccharides with a molecular weight of more than 10 000 can be separated. They make up about half of the carbohydrates of the extracts. Their composition corresponds to that of the latter. Finally, one can obtain yet another group of almost intact high polymeric carbohydrates as copper complexes. However, they consist only of mannan and galactan, mannan predominating significantly. Arabica and Robusta coffees showed differences in this respect. Whereas Arabica coffee was able to release only a certain amount of these very high-polymeric carbohydrates, Robusta coffee delivered ever greater amounts of these polysaccharides with increasing extract yields.

Solvent extraction chemistry in the atomic energy industry — A review

Solvent extraction chemistry in the atomic energy industry — A review

Solvent extraction chemistry. Fundamentals and applications

Solvent extraction chemistry. Fundamentals and applications

International Conference on Extraction Chemistry

International Conference on Extraction Chemistry

Modern Countercurrent Distribution

Abstract Interest in liquid-liquid extraction continues to grow as evidenced by such divergent applications as industrial waste water treatment1,2 cleanup for pesticide residue analysis3, and resolution of optical isomers.4 This activity results from increased understanding of the chemistry of solvent extraction which is leading to the design of specially selective systems4,5as well as the development of improved extractors emanating from studies of mass transfer phenomena6,7 in continuously flowing systems

Author List

Author List

The meaning of slope analysis in solvent extraction chemistry: The case of zinc extraction by trilaurylammonium chloride

Abstract By using suitable equations, which are derived by treating the extraction of a metal complex in the general form pMY n + q RY ⇌ (RY) q (MY n ) p (with MYn extractable species, RY extracting agent, (RY) q (MY n ) p complex formed by the extraction reaction, with the bar indicating organic phase species), the physical meaning obtained by the slope analysis of extraction data (logarithmic plot of distribution coefficient vs. extractant concentration) has been discussed. The experimental case of distribution data obtained by extracting ZnCl2 with a benzene solution of trilaurylammonium chloride in a wide range of metal and extractant concentration has been treated.

SOLVENT EXTRACTION RESEARCH A. S. Kertes and Y. Marcus (Hebrew University, Jerusalem), eds. Wiley-Interscience Div. of John Wiley & Sons, 1969. 439 pp. Proc. 5th. Intern. Conf. on Solvent Extraction Chemistry held in Jerusalem, Irael, Sept. 16-18, 1968

Journal Article SOLVENT EXTRACTION RESEARCH A. S. Kertes and Y. Marcus (Hebrew University, Jerusalem), eds. Wiley-Interscience Div. of John Wiley & Sons, 1969. 439 pp. Proc. 5th. Intern. Conf. on Solvent Extraction Chemistry held in Jerusalem, Irael, Sept. 16–18, 1968 Get access Journal of Chromatographic Science, Volume 8, Issue 7, July 1970, Page D24, https://doi.org/10.1093/chromsci/8.7.D24-e Published: 01 July 1970

Conference on the Chemistry of Solvent Extraction

Conference on the Chemistry of Solvent Extraction

INDIRECT DETERMINATION OF MERCURY BY ATOMIC ABSORPTION SPECTROPHOTOMETRY USING ZINC HOLLOW CATHODE LAMP

Abstract An indirect atomic absorption spectrophotometric method for mercury has been developed on the basis of solvent extraction chemistry. Mercury(II) was converted into a bromo-complex anion and extracted into 1,2-dichloroethane with the 2,2′-bipyridyl-zinc chelate cation. The resulting zinc in the extract, which was equivalent to a specific amount of mercury, was determined by atomic absorption spectrophotometry. The sensitivity for the determination of mercury could be enhanced to the level of zinc by the proposed method.

New books - Solvent extraction chemistry

New books - Solvent extraction chemistry

Synergism and diluent effects in the extraction of cesium by 4-sec-butyl-2-(α-methylbenzyl)phenol (BAMBP)

In order to understand better the nature of the extraction of cesium by 4-sec-butyl-2-(α-methylbenzyl)phenol (BAMBP), the effects of various synergistic reagents and diuleutns on the extraction have been studied. The synergistic reagents included di(2-ethylhexyl)phosphoric acid (HDEHP0 and two car☐ylic acids, 4-phenylvaleric acid (HV) and heptadecyl tetrapropenylsuccinic acid (HS). The diluents included octanol-1 (hydrogen bonded, donor type), acetophenone (non-hydrogen bonded, donor type), and chloroform (weakly hydrogen bonded, acceptor type), besides carbon tetrachloride and an aliphatic hydrocarbon. Synergism was slight at pH > 11, increasing in neutral and slightly acid solutions to, e.g. enhancement x > 100 with 0·02 M HV−1 M BAMBP in CCl 4 and X > 1000 with 0·01 M HDEHP-1 M BAMBP in hydrocarbon at pH = 7. The dependence of E a 0 on BAMBP concentration in the presence of HDEHP and HV changed in different pH regions. The extraction chemistry was interpreted primarily on the basis of these extraction data. I.R., NMR, and dielectric constant measurements were used to corroborate and extended our understanding of the nature of the molecular interactions involved in these systems and their effects on the extraction mechanisms. The principal extract species appears to be [Cs·4 BAMBP] + Y − , where Y − represents V − , HV 2 − , or H(DEHP 2 − , plus some species with the anion directly coordinated to cesium: CsY·2 BAMBP and CsV·3 BAMBP.

300. The chemistry of extractives from hardwoods. Part XXXVII. The synthesis of furoguaiacin ethers

The first page of this article is displayed as the abstract.

761. The chemistry of extractives from hardwoods. Part XXXVI. The lignans of Guastiacum officinale L.

761. The chemistry of extractives from hardwoods. Part XXXVI. The lignans of Guastiacum officinale L.

261. The chemistry of extractives from hardwoods. Part XXXV. The constitution of Maesopsin (2-benzyl-2,4,6,4′-tetrahydroxycoumaranone) and of its alkali fusion products

261. The chemistry of extractives from hardwoods. Part XXXV. The constitution of Maesopsin (2-benzyl-2,4,6,4′-tetrahydroxycoumaranone) and of its alkali fusion products

On Extraction Chemistry of some Chlororuthenium Complexes from Aqueous Hydrochloric Acid Solutions

AbstractNitrosyl radioruthenium trichloride and radioruthenium hydroxytrichloride carrier free were prepared. Solvent extraction studies of both compounds in HCl and NaCl aqueous solutions lead to the conclusion that change in Ru‐valence state from II to IV decrease the extractability of the element by Tri‐n‐butyl phosphate (“TBP”) seriously. A probable interpretation is stated. It was also shown that the extracting power of TBP increases with dehydration and decreases with acidolysis by HCl aqueous solutions. Data are represented and discussed.

On the Extraction Chemistry of Nitrosylruthenium Nitrato Complexes from aqueous nitric acid

AbstractThe distributions of nitrosylruthenium nitrate complexes are discussed in TBP—HNO3 system using 10−9 M. Rd Ru. It was found to be affected by the concentration of HNO3, NO3, TBP and the temperature. The results are represented and discussed.

227. The chemistry of extractives from hardwoods. Part XXXIII. Extractives from Melanorrhea spp. (rengas)

The first page of this article is displayed as the abstract.

983. The chemistry of hardwood extractives. Part XXXIV. Constituents of Guarea species

983. The chemistry of hardwood extractives. Part XXXIV. Constituents of Guarea species

有機リン化合物による金属の溶媒抽出, (I)

A systematic study of the basic chemistry of solvent extraction of metals by organophosphorus compounds carried out in JAERI is reported. As for the general study, thermodynamic and structural chemical approaches were employed.The thermodynamical treatment of the distribution equilibrium measurement was carried out rather precisely to analyse the mechanism of solvent extraction. This was applied to determine the compositions of the complexes formed and the chemical reactions underlying.Further, it was shown the competition of metal and proton acid could clearly explain the extraction behaviors in these systems.The spectroscopic measurements of the solvents were conducted. Especially, in the infra-red region, the shift of the P=0 vibrational spectra of the solvent and the splitting of the NO3 vibrational spectra of the nitrate ions gave very powerful measures to study the microscopic mechanism of complex formation between the solvent and the species extracted.The thermodynamic and structural chemical approaches carried out were turned out to be in good accord and complementary.