摘要:

A solvent system of formamide-methanol-glacial acetic acid has been found to be particularly useful in the separation of the geometrical isomers of di- and tripositive cobalt(III) amine complexes from each other. Best separations are obtained for the various aquo complexes, so that this method may be of value in the study of hydrolysis or solvolysis reactions of these complexes.

ISSN:0037-2366    

DOI:10.1080/01496396908052240

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

Zone melting of organic compounds was observed under the microscope. A host of phenomena were noted that can greatly affect the separation attained in a fractional-solidification operation. Liquid and gaseous inclusions moved toward the melt in some systems and farther into the solid in other situations. Sometimes impure melt was sucked into the frozen solid through cracks. Insoluble foreign particles were both bounced and incorporated by freezing interfaces of camphor and anthracene. Oscillations in interface position were caused by irregular free connection both inside and outside the sample cells. Bubbles in the melt sometimes caused agitation of the melt and other times selective growth of a volatile component. Bulk drainage and falling crystals from horizontal melting interfaces were observed. During melting of camphor-anthracene mixtures some anthracene platelets grew larger.

ISSN:0037-2366    

DOI:10.1080/01496396908052241

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

Copper, nickel, zinc, cadmium and four other metals were separated on cation-exchange resins, using as eluents solutions of mono-, di- and triethanolamine with their chloride and nitrate salts. Column chromatography was used, also chromatography on resin-impregnated paper. Under suitable conditions Cu(II) is not retained by the resin at all; this fact is attributed to the formation of uncharged hydroxy-complexes. This may also occur with Ag(I).

ISSN:0037-2366    

DOI:10.1080/01496396908052242

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

In a binary mixture of surface-active sodium salts of dodecylsulfate, benzenesulfonate and dodecylbenzenesulfonate, each substance appeared to act independently over the range of concentrations examined. There was no evidence of competition like that reported earlier for a system that involved ion-pairing. In cases such as those in the present study, degradation of the separation may result when the less surface-active species is initially much lower in concentration. Measurements of the volume of solution in the flask during a foaming experiment confirmed the expectation that faster gas flows and higher concentrations of surface-active species lead to higher holdup and longer time to reach a steady state.

ISSN:0037-2366    

DOI:10.1080/01496396908052243

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

This study is concerned with the separation of gas mixtures by selective permeation through nonporous polymeric membranes, a technique that has made considerable progress in recent years. First, several theoretical methods for calculating the separation achievable in a single permeation stage are reviewed and their advantages and limitations are discussed. The methods under consideration assume two idealized flow regimes inside the stage, which are characterized by (a) perfect mixing on both sides of the membrane and (b) cross-flow with no mixing on either side of the membrane. Computer programs for the numerical evaluation of these methods are presented. Second, the effects of several important process variables on the single-stage separation and membrane area requirements are outlined in a parametric study, with special reference to the separation of oxygen from air. The variables include (a) the ratio of pressures on the two sides of the membrane, (b) the pressure level at constant pressure ratio, (c) the fraction of feed permeated (the stage “cut”), and (d) the ideal separation factor. The practical implications of the results are also discussed.

ISSN:0037-2366    

DOI:10.1080/01496396908052244

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

Mesityl oxide [(CH3)2C=CHCOCH3] was used for the solvent-extraction separation of some transition metals. It was found that iron(III) can also be quantitatively extracted from 3.25 to 5Mhydrochloric acid solution. The method is simple and rapid, and is applicable in presence of large number of ions at milligram level. It was applied for the separation of iron from alloy-steel.

ISSN:0037-2366    

DOI:10.1080/01496396908052245

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

Separation of gases or vapors by barriers (both porous and nonporous membranes) results from the preferential permeation of the light component out of a gaseous mixture. Calculations of enrichment in a single stage were first presented by Weller and Steiner (1) for nonporous membranes. Also, similar calculations were reported by Naylor and Backer (2) for a porous membrane. However, these results can be applied interchangeably to porous and nonporous membranes if a proper separation factor is used. The mathematical forms of these two approaches appear to be entirely different. Therefore, the aim of the present paper is to show that Eq. (15) in Weller and Steiner's paper (1) reduces to Eq. (24) of Naylor and Backer's paper (2) when the pressure of the undiffused stream becomes zero. These equations permit one to calculate the concentration of the diffused stream when the concentration of the undiffused stream, the separation factor, and the “cut” are known quantities. Both equations are derived based on the nonmixing model.

ISSN:0037-2366    

DOI:10.1080/01496396908052246

出版商:Taylor & Francis Group    

年代:1969

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:10.1080/01496396908052239

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor