摘要:

Total flow rates of gases through activated charcoal rods are regarded as consisting of the sums of comparatively independent flows through macropores and micropores. The flow rate through the macropore system is related to the relevant adsorption isotherm by means of an empirical equation having three arbitrary constants. The empirical equations can be fitted to all of our observed results within the experimental error. Assuming that the adsorbate behaves as a one-component fluid such as a gas in a gravitational field, it is shown that compressive surface forces give rise to large fluid pressures within micropores. A very simple flow equation is derived which is qualitatively in agreement with observed results and which indicates a mean micropore diameter, of the order of 10−7 cm. The derived equation illustrates the nature of the physical factors involved and shows that surface forces may increase flow rates of adsorbable gases by very large factors. The increased flow rates are due mainly to the greatly increased densities and to the increased pressure gradients resulting from the action of surface forces. A model porous adsorbent is presented which exhibits many properties of real adsorbent systems and illustrates especially the relations between adsorbate densities and the various tensions and pressures existing within micropore systems.

ISSN:0008-4042    

DOI:10.1139/v52-048

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

1-Indoleacetic acid, 3-methyl-1-indoleacetic acid, and several of their derivatives were formed from phenylhydrazineacetic ester, and their structures were determined in three different ways. Several of the new compounds exhibited plant growth regulating activity.

ISSN:0008-4042    

DOI:10.1139/v52-049

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

The liquid–vapor coexistence curves of very pure xenon have been determined in bombs of vertical lengths 1.2 cm. and 19 cm. The longer bomb yielded a flat-topped coexistence curve, the shorter a more rounded curve. The classical van der Waals theory is capable of explaining a large portion of the flat top if effects of gravity are taken into account. Details of the theoretical variation of the width of the flat top with vertical bomb lengths are given. The critical data obtained for xenon areρc = 1.105 gm./cc.,Tc = 16.590 ±.001 °C. The danger of contamination of gases in the critical region on contact with gasket or packing materials is stressed.

ISSN:0008-4042    

DOI:10.1139/v52-050

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

It is shown that benzophenone containing the C14O group reacts with 2,4-dinitrophenylhydrazine more slowly than does ordinary benzophenone. The ratio of the rate constants is 1.099 ±.011 at 27.8 °C.

ISSN:0008-4042    

DOI:10.1139/v52-051

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

A theoretical analysis is made of the effect of nitrogen isotopic substitution on the rate of deammonation of phthalamide. Good agreement is found between theory and experiment.

ISSN:0008-4042    

DOI:10.1139/v52-052

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

A procedure is outlined by which sodium chloride particles of specific surface up to 50 m2per gm. may be prepared. The particles form in chains and are found to lose area rapidly in moist air. The fundamental units of the chain do not appear cubic. Single cubic particles or chains of cubic particles also have been prepared. The one sample identified as this type had a specific surface of 18 m2per gm. The sintering in moist air appears to occur by a process of solution and recrystallization. A value of the interfacial free energy solid–liquid is calculated from the data.

ISSN:0008-4042    

DOI:10.1139/v52-053

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

The compound, m.p. 140 °C., widely used as a derivative for the identification of formic acid was found to bep-bromophenacyl alcohol and notp-bromophenacyl formate.p-Bromophenacyl alcohol was also the product from an attempt to preparep-bromophenacyl pyruvate.p-Bromophenacyl formate, m.p. 92 °C., was prepared in 80% yield by refluxing equivalent amounts of the reactants in 66% alcohol for 30 min. This ester is readily hydrolyzed under the conditions used for its preparation and the hydrolysis appears to be catalyzed by salts of carboxylic acids. The melting point ofp-bromophenacyl alcohol depended on the rate of heating, varying from 137 °C. with slow heating to 142 °C. with the rapid heating obtained on a melting point bar.

ISSN:0008-4042    

DOI:10.1139/v52-054

出版商:NRC Research Press    

年代:1952

数据来源: NRC