摘要:

The position and number of deuterium atoms substituted onto the toluene molecule was found to affect its separation behavior on a silver nitrate-water column. Substitution on the ring affected the capacity ratio substantially while substitution on the methyl group had no measurable effect. At the same time, the separation behaviors of benzene and perdeuterobenzene were examined using several other salt solutions and polar liquids as possible stationary phases.

ISSN:0037-2366    

DOI:10.1080/00372367208055575

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The kinetic scheme for the photo-isotopic separation of uranium is discussed. The effect of different processes on the efficiency is demonstrated and it is shown that the addition of a quencher enchances the selectivity but decreases the efficiency of the process.

ISSN:0037-2366    

DOI:10.1080/00372367208055576

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The separation of air-SO2mixtures in a specially prepared silica gel column has been accomplished using a direct mode thermal parapump. The effect of the number of cycles, pumping cycle time, and operating temperature range and level on the extent of separation has been studied over a wide range of operating conditions. The separation factors obtained were several orders of magnitude greater than those typically reported in the literature for gas-solid systems, and compare favorably with those obtained in liquid-solid systems.

ISSN:0037-2366    

DOI:10.1080/00372367208055577

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

A new technique for two-dimensional development in staged systems utilizing the two-dimensional cross-flow cascade is presented. Ideal theories for two sequential and one simultaneous development technique are presented and the results are compared. All three development techniques will separate mixtures which cannot be separated by one-dimensional development. The simultaneous development technique appears to be preferable because it is less time consuming and requires fewer stages. It is also shown that a three-dimensional cross-flow system will give the same distributions as simultaneous development in two-dimensional cross-flow except the system can have a continual feed instead of a batch feed.

ISSN:0037-2366    

DOI:10.1080/00372367208055578

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

Two methods for separating the acid compound types of high-boiling petroleum distillates have been investigated. The first method utilized ferric chloride and ion-exchange resins, and the second method used gel permeation chromatography. Each method was found to have merits, and the two methods can be used to complement each other. The major compound types of a Wilmington 400–500[ddot]C acid concentrate have been separated and identified using these methods. Data from the separation schemes will aid in the characterization of the acidic materials.

ISSN:0037-2366    

DOI:10.1080/00372367208055579

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The basic definition of qualitative analytical efficiency has been evaluated in the light of recent advances in automated numerical analysis. The low resolution region R < 1.0 is explored theoretically, and it is shown that significant improvement results by analysis of the first derivative instead of the actual concentration curve.

ISSN:0037-2366    

DOI:10.1080/00372367208055580

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The number of H2O and organic solvent molecules associated with rhodo-mine B, tris-1,10-phenanthroline iron(II) chloride, and iron(III) ace-tylacetonate in seven extraction solvent systems was determined. The methods of measurement were viscosity, gas chromatography, and differential direct injection enthalpimetry.

ISSN:0037-2366    

DOI:10.1080/00372367208055581

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

D-Amino acid oxidase has been amide-linked to ω-aminoalkyl agarose particles. The insolubilized enzyme has characteristics similar to the soluble form with respect to stability, pH optimum, affinity for flavin adenine dinucleotide, and general substrate specificity, although smaller Michaelis constants were found for some substrates. The potential application for the separation of the natural L-amino acid isomers from racemates has been demonstrated.

ISSN:0037-2366    

DOI:10.1080/00372367208055582

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

A systematic liquid-liquid extraction behavior of some trivalent metals has been carried out with the high-molecular-weight synthetic carboxylie acid SRS-100 with benzene as diluent. In most cases extraction was quantitative; but in the casss of gallium and antimony the maximum extraction was 97.2 and 65%, respectively. Using pure solvent (without benzene diluent), quantitative extraction (> 99%) of gallium was possible with SRS-100 at pH 4.6. Gradual neutralization techniques have been adopted to study the extraction behavior of antimony in the pH range 2.0–6.5. The effect of metal ion concentration, solvent concentration, salting-out agents, diluents, and finally the interferences of associated elements were critically examined. The percentage extraction at various ranges of pH has also been studied. Some important separations have been carried out by exchange reactions. The proposed methods are very simple, rapid, and fairly selective. They can be carried out both at micro and macro levels.

ISSN:0037-2366    

DOI:10.1080/00372367208055583

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The systematic solvent extraction behavior of cerium(IV), zirconium, and thorium has been studied with the high molecular weight carboxylic acids SRS-100 and Versatic-9, with benzene as diluent. Quantitative extraction has been achieved in almost all cases. Only in the case of zirconium has incomplete extraction (73.5%) been reported with Versatic-9. Quantitative extraction requires three consecutive equilibrations at pH 2.9. The effect of metal ion concentration, solvent concentration, diluents, and the interference of the associated elements were critically examined. The percentage extraction at various ranges of pH has been studied. Exchange reaction techniques have been employed in several systems. The proposed methods are very simple, rapid, and fairly selective. They can be carried out both at micro and macro levels, and they are applicable to extraction of metal ions in the presence of other commonly interfering ions.

ISSN:0037-2366    

DOI:10.1080/00372367208055584

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor