Solid Solutions in Hydrocarbon Systems

Tooke, J. W.; Aston, J. G.

doi:10.1021/ja01228a517

Cited by 6 publications

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“…A probable cause is solid-solubility. Formation of solid solutions with 2,4-dimethylpentane had been reported earlier by Tooke and Aston (22); in addition 2,2-, 2,3-, and 3,3-dimethylpentanes, 3-methylhexane (possibly 2methylhexane), 3-ethvlpentane, as well as cyclohexane, methylcyclopentane, and others are apparently solid-soluble (12). None of the above mentioned hydrocarbons were found to raise the freezing point, so that while the purity of the sample cannot at present be more accurately calculated than 99.9 =*= 0.05%, it appears reasonably certain that it is of better purity than any previous!}'…”

Section: Experiments On Purification Of Hydrocarbonssupporting

confidence: 62%

Adsorption - A Tool in the Preparation of High-Purity Saturated Hydrocarbons

Hirschler¹,

Amon²

1947

Ind. Eng. Chem.

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Mixtures of isomeric saturated hydrocarbons, including geometric isomers, can be separated by adsorption on silica gel or activated carbon; activated alumina gives very little separation. Data are given on the separation of many binary synthetic mixtures, including paraffin-paraffin, paraffin-naphthene, and naphthene-naphthene types.Most of these systems give S-type isotherms on silica gel and U-type isotherms on carbon. The effect of hydrocarbon type and molecular weight on adsorbability is discussed. The theoretical basis for the results obtained is considered; they may be reasonably explained in terms of DURING the past decade the use of adsorbents, particularly silica gel, for the separation of hydrocarbons of different chemical types has become rather widespread. Previous work has shown that for hydrocarbons of similar molecular weight, the adsorbability, in general, increases with the number of double bonds per molecule. Thus, for example, small amounts of olefins or aromatics are removed from saturated hydrocarbons by percolation through silica gel.Silica gel has also been used where it has been desired to remove small amounts of nonhydrocarbon impurity from hydrocarbons.

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Section: Experiments On Purification Of Hydrocarbonssupporting

confidence: 62%

Adsorption - A Tool in the Preparation of High-Purity Saturated Hydrocarbons

Hirschler¹,

Amon²

1947

Ind. Eng. Chem.

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“…Therefore the question arises in evaluating an analysis by this method as to how one knows whether or not solid solutions are formed between the solvent and the impurity. The importance of recognizing the existence of solid solution in the analysis of organic chemicals by the freezing or melting point method is not to be underestimated, for it has been found that six binary systems of relatively closeboiling hydrocarbons indicate solid solution formation (17). Figure 6.…”

Section: Discussionmentioning

confidence: 99%

Melting Point Calorimeter for Purity Determinations

Aston¹,

Fink²,

Tooke³

et al. 1947

Anal. Chem.

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Thermal quantities of some cycloparaffins. Part II purification of the samples)

Kaarsemaker

Coops

1952

Recl. Trav. Chim. Pays‐Bas

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Purification of the cyclanes with 4 to 9 C-atoms was effected by fractional distillation. Progress of the purification was checked with the aid of melting curves of the fractions {heat content vs. temperature curves of the melting process). The impurity content of the final samples is estimated at less than 0.2 yo. A fractionating column with a rotating cylinder and a small calorimeter for measurements on melting and transition processes a t temperatures from -180" to +70" are described. 1 . Methods of purification.Whenever possible, the samples obtained in the preparations 1) were first treated with conc. sulphuric acid to remove all impurities except saturated hydrocarbons. Separation from the remaining impurities was performed by fractional distillation. Purification by Mulder's 2 ) method, consisting of successive partial meltings of the frozen sample, each time removing the liquid fraction, was also investtgated for the substances involved here. These experiments in a test model of a self-charging centrifuge, on cyclohexane and cyclooctane to which impurities were added, indicated that only a small purifying effect could be expected. Evidence was obtained that the cyclanes described here, form mixed crystals with small amounts of many substances, cf ").W i t h a view to purifying the cyclanes, with boiling points varying between 12 and 180° C, a fractionating column with a rotating cylinder 4 ) 5 ) having approximately 50 theoretical plates was constructed. Cyclononane, cyclooctane, cycloheptane and cyclohexane, becoming available before the new column, were purified by fractional distillation in column 1 1 ) . In order to obtain the highest possible yield of purest 1) This research was supported by grants from the "Nederlandsche Organisatie voor Zuiver Wetenschappelijk Onderzoek". Part I: Rec. trav. chim. 70, 1033Rec. trav. chim. 70, (1951.

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Solid Solutions in Hydrocarbon Systems

Cited by 6 publications

References 0 publications

Adsorption - A Tool in the Preparation of High-Purity Saturated Hydrocarbons

Adsorption - A Tool in the Preparation of High-Purity Saturated Hydrocarbons

Melting Point Calorimeter for Purity Determinations

Thermal quantities of some cycloparaffins. Part II purification of the samples)

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