摘要:

A dispersion method has been developed for the determination of aromatics in the presence of paraffinic and naphthenic hydrocarbons. The method has been applied to selected cuts obtained by fractionation of Turner Valley crudes. The percentages of benzene, toluene, and the xylenes occurring in a series of Turner Valley crudes have been determined.

ISSN:1923-4287    

DOI:10.1139/cjr42b-033

出版商:NRC Research Press    

年代:1942

数据来源: NRC

摘要:

In previous studies it has been shown that the mechanism of decomposition of acyl diurethanes by ammonia and amines is correlated to some extent with the strength of the acid from which the acyl radical is derived and of the base used as ammonolytic reagent. In the oxalic acid series a diurea was obtained from succinyl-diurethane and aniline, but not from oxalyl- or malonyl-diurethane. Succinyl-diurethane gave no diurea with stronger bases.It is shown in the present study that phenylmalonyl-diurethane yields with aniline a diurea which undergoes rapid decomposition on being heated with aniline at 150 °C. Phenylsuccinyl-diurethane gives with aniline a diurea that is much more stable than the one obtained from succinyl-diurethane, as judged by the rate of decomposition on heating with aniline at 150°. No definite evidence of diurea formation was obtained with bases stronger than aniline.

ISSN:1923-4287    

DOI:10.1139/cjr42b-034

出版商:NRC Research Press    

年代:1942

数据来源: NRC

摘要:

A survey was carried on for 12 months to determine the amount of vitamin C actually available in the food served in Athabasca Hall, a residence for men at the University of Alberta. The amount of vitamin C excreted by some of the persons living at Athabasca Hall was also determined and correlated with the intake. It was found that the output was higher in the fall after high intake than in the spring after the low supply during the winter. The average daily intake of vitamin C from November to May, inclusive, was 41 mg., and from June to October, inclusive, 82 mg. If citrus fruits had been excluded from the diet, the intake would have been markedly less. In the spring months the tissues of all persons tested by a test dose method were found to be unsaturated whereas in the autumn two persons out of six showed tissue saturation. No frank scurvy existed among the subjects and no marked incidence of gum-bleeding was reported.

ISSN:1923-4287    

DOI:10.1139/cjr42b-035

出版商:NRC Research Press    

年代:1942

数据来源: NRC

摘要:

The reaction of hydrogen atoms with isobutane has been investigated by the Wood–Bonhoeffer discharge tube method, over a temperature range 30° to 250 °C. An activation energy of 10.5 ± 1.5 kcal. was obtained for the reaction.The nature of the products at a given temperature was found to depend upon the concentration of hydrogen atoms present. With low atom concentrations (5 to 9%) methane was essentially the only product at temperatures below 170 °C. At 250 °C., ethane was formed to the extent of approximately one-half the amount of methane. With higher atom concentrations (14 to 24%) ethane was formed in appreciable quantities at 140° to 170 °C., and exceeded the methane content at 250 °C. Small amounts of propane were formed at the higher temperatures.The results at low temperatures appear to be satisfactorily explained by assuming a primary dehydrogenation reaction:followed by a series of "atomic cracking" reactions. To account for the behaviour at higher temperatures, additional secondary reactions, involving decomposition of radicals and their reaction with molecular hydrogen, are assumed.

ISSN:1923-4287    

DOI:10.1139/cjr42b-036

出版商:NRC Research Press    

年代:1942

数据来源: NRC