Analysis of Light Constituents in Crude Petroleum by Low-Temperature Fractional Distillation

1945 ◽  
Vol 17 (4) ◽  
pp. 241-241 ◽  
Author(s):  
R.J. Askevold ◽  
M.S. Agruss
Keyword(s):  
Low Temperature ◽  
Fractional Distillation ◽  
Crude Petroleum

Laboratory Low Temperature Fractional Distillation

1949 ◽  
Vol 21 (10) ◽  
pp. 1197-1200 ◽  
Author(s):  
C. E. Starr ◽  
J. S. Anderson ◽  
V. M. Davidson
Keyword(s):  
Low Temperature ◽  
Fractional Distillation

Laboratory Low-Temperature Fractional Distillation

1947 ◽  
Vol 19 (6) ◽  
pp. 409-412 ◽  
Author(s):  
C. E. Starr ◽  
J. S. Anderson ◽  
V. M. Davidson
Keyword(s):  
Low Temperature ◽  
Fractional Distillation

THE MERCURY PHOTOSENSITIZED DECOMPOSITION OF ETHANE: III. THE REACTION IN THE PRESENCE OF ADDED DEUTERIUM

1938 ◽  
Vol 16b (9) ◽  
pp. 314-318 ◽  
Author(s):  
E. W. R. Steacie ◽  
W. A. Alexander ◽  
N. W. F. Phillips
Keyword(s):  
Quantum Yield ◽  
Low Temperature ◽  
Fractional Distillation ◽  
Deuterium Content ◽  
Methyl Radicals ◽  
Rapid Exchange ◽  
Ethyl Radicals

The mercury photosensitized reactions of ethane-deuterium mixtures have been investigated. The products of the reaction were separated by low-temperature fractional distillation, and the deuterium content of each was determined. It was found that the methane produced was highly deuterized, while the residual ethane was only slightly deuterized. Propane and butane were also considerably deuterized. It is concluded:(a) That rapid exchange of methyl radicals and deuterium atoms occurs, as previously suggested by Morikawa, Benedict, and Taylor;(b) That ethyl radicals are rapidly exchanged in a similar way;(c) That the reactions[Formula: see text]and[Formula: see text]do not occur to any great extent, and hence the low quantum yield of the reaction cannot be ascribed to re-formation of ethane.

Low Temperature Fluorescence Studies of Crude Petroleum Oils

2011 ◽  
Vol 25 (11) ◽  
pp. 5022-5032 ◽  
Author(s):  
Peter Owens ◽  
Alan G. Ryder
Keyword(s):  
Low Temperature ◽  
Crude Petroleum ◽  
Fluorescence Studies ◽  
Petroleum Oils

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

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