摘要:

The influence of silanization of glass beads on the exclusion process has been studied. Some attempts to evaluate the influence of adsorption properties of glass beads are made.

ISSN:0037-2366    

DOI:10.1080/00372367708057073

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

To facilitate the determination of the separation factor and the number of theoretical stages of a square cascade of close-separation stages from measurements of its long-time kinetics under total reflux, extensive tables of kinetics parameters have been produced in accordance with K. Cohen's theory. Cohen's treatment has been extended in several ways. The kinetics parameters of the first transient term have been finely mapped, and the ranges of various parameters have been extended to include large overall separations as well as the stripping section. The second transient term of the long-time kinetics has been evaluated, and a possible application of this correction term has been suggested in relation to the experimental determination of the column parameters. Under comparable conditions a steady concentration profile, along the column, is attained faster in the stripping section than in the enriching section. A distinction between the enriching and stripping section is important in using the transient theory for the evaluation of the cascade characteristics under ordinary laboratory conditions.

ISSN:0037-2366    

DOI:10.1080/00372367708057074

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Asphalt obtained from a refinery in Montreal was dissolved in toluene then fractionated in a preparative gel permeation chromatograph (prep.-GPC). Twenty-three fractions differing widely in molecular weights were collected and characterized by analytical GPC, viscometry, vapor pressure osmometry (VPO), element analyses, infrared spectroscopy (IR), and nuclear magnetic resonance spectroscopy (NMR). Similar studies were also carried out, for comparison purposes, on aliphatic and aromatic hydrocarbons to elucidate structure information on the different asphalt fractions.

ISSN:0037-2366    

DOI:10.1080/00372367708057075

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

An analysis of the problem of isotope enrichment in species dissolved in aqueous and organic phases is presented. Two examples are given and discussed.

ISSN:0037-2366    

DOI:10.1080/00372367708057076

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Studies have been made on the extraction of some actinides [Th(IV), Pa(V), and U(VI)] and lanthanides [La(III), Ce(III), Pm(III), Eu(III), and Tb(III)] from hydrochloric acid medium by dialkyl sulfoxides. The actinides have extraction maxima at 7.0MHCl while the lanthanides practically do not get extracted. Thus the extraction separation of these two groups can be effected by the preferential extraction of the actinides by the sulfoxides.

ISSN:0037-2366    

DOI:10.1080/00372367708057077

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Di-n-pentyl sulfoxide (DPSO) was employed for the solvent extraction separation of some transition metals from hydrochloric acid medium. It was found that chromium(VI) gets extracted at low acid concentrations (3 to 4.5M), and iron(III) and cobalt(II) only above 5MHCl. Nickel was not extracted at any of the test conditions. These transition metals were separated from one another by suitable choice of the extraction conditions.

ISSN:0037-2366    

DOI:10.1080/00372367708057078

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Thin-layer chromatography of metal ions has been performed on stannic tungstate using solvent systems containing dimethyl sulfoxide. Such binary separations as Fe-Al, La-Pr, La-Nd, Cr-Al, Tl-In, Fe-Mn, and Cr-Mn have been achieved. Gold (100 to 240 μg) has been separated quantitatively from vanadium, chromium, cerium, iron, cobalt, nickel, bismuth, manganese, titanium, and thorium in DMSO: water (1:1), and the method has been found to be precise and accurate.

ISSN:0037-2366    

DOI:10.1080/00372367708057079

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

The extraction of 10 phenolic acids from aqueous solutions was investigated by liquid-liquid partition chromatography using four diluents of various polarities: cyclohexane, benzene, di-n-butyl ether and diisobutyl ketone. Apparent solvation numbers were estimated from logDvs log% TBP plots. It is demonstrated that even low concentrations of TBP cause a significant increase of extraction of organic acids.

ISSN:0037-2366    

DOI:10.1080/00372367708057080

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

ISSN:0037-2366    

DOI:10.1080/00372367708057081

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0037-2366    

DOI:10.1080/00372367708057072

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor