摘要:

AbstractRate of mass transfer in granular beds has been studied by determining the rate of dissolution of benzoic acid in water and aqueous glycerol solutions and of sulphur in benzene. For liquid‐continuous flow and film‐like flow, mass transfer coefficients could be correlated by dimensionless equat

ISSN:0165-0513    

DOI:10.1002/recl.19480670702

出版商:WILEY‐VCH Verlag    

年代:1948

数据来源: WILEY

摘要:

AbstractA new method for the determination of the disintegrability of fire bricks by carbon monoxide is described. The method is characterised by careful crushing of the brick and by leading a synthetic gas mixture of about 3% hydrogen, 34.5% carbon monoxide and 62.5% nitrogen and argon over 100 g of this grog at 600° or 800° C at a rate of 5‐liter/h, and titrating the developed carbon dioxide after absorption in baryta water.Several precautions, the preparation of the gas mixture, the results in field tests, and a tentative specification for the resistance to disintegration are gi

ISSN:0165-0513    

DOI:10.1002/recl.19480670703

出版商:WILEY‐VCH Verlag    

年代:1948

数据来源: WILEY

摘要:

AbstractThe influence of rapid temperature changes (15‐40° C/min) in the material causes an excessive carbon deposition and carbon dioxide evolution both for a temperature increase and a temperature decrease, regardless of the gas atmosphere at the change in temperature.The behaviour of different catalytic materials is discussed. Contrary to current belief the behaviour of natural and synthetic iron compounds (as oxides etc.) is unlike that of similar materials after mixing with clay and burning, as regards the catalytic activity as a function of temperature and sulphur compounds. There seem to be indications that in fire brick the catalytic iron compounds are activated in some way, perhaps by alkali from the clay, as those catalysts are far more resistant to sulphur compounds and as the deposition of carbon and evolution of carbon dioxide increases with increasing temperature from 400° to 800° C.The compressibility of carbon deposited at 450°, 600° and 750° C and of powdered coke has been determined. There is not much difference between that of coke and that of deposited carbon. So the hypothesis ofDiepschlag1) about this property seems not quite

ISSN:0165-0513    

DOI:10.1002/recl.19480670704

出版商:WILEY‐VCH Verlag    

年代:1948

数据来源: WILEY

摘要:

AbstractA new method for the synthesis of furan derivatives is outlined. By the action of a mixture of concentrated sulphuric acid and acetic anhydride in the molecular ratio of 1:2 on αβ‐ or β γ‐unsaturated ketones, having a branching of the carbon skeleton in the β‐position, δ‐sultones with two conjugated double bonds in the hetero‐ring are obtained. On pyrolysis these δ‐sultones yield sulphur dioxide and

ISSN:0165-0513    

DOI:10.1002/recl.19480670705

出版商:WILEY‐VCH Verlag    

年代:1948

数据来源: WILEY

摘要:

AbstractThe preparation of 3‐methyl‐4‐ethylpyridine, 3‐methyl‐4‐n‐propylpyridine and 3‐methyl‐4‐n‐butylpyridine from 3‐methylpyridine, by the method ofWibau

ISSN:0165-0513    

DOI:10.1002/recl.19480670706

出版商:WILEY‐VCH Verlag    

年代:1948

数据来源: WILEY

摘要:

AbstractUsing the latest data on the atomic weight, as atomic proportions and thermodynamical constants, the chemical equilibrium between molecules Br2, Cl2and BrCl is calculated.

ISSN:0165-0513    

DOI:10.1002/recl.19480670707

出版商:WILEY‐VCH Verlag    

年代:1948

数据来源: WILEY

摘要:

AbstractWhen a gaseous component is absorbed by a liquid under simultaneous reaction with a component of the liquid, the overall rate of reaction proves to be a dimensionless function of four limiting rates:a.the maximum rate of diffusion of the gaseous component through the liquid filmb.the maximum rate of diffusion of the liquid‐component through the liquid filmc.the limiting rate of reaction within the liquid film (during diffusion)d.the maximum rate of reaction within the main body of the liquid.A graphical representation of the theoretical relationship enables one to predict the overall rates of interphase mass exchange under arbitrary conditions, as soon as reaction velocity coefficients and mass transfer coefficients are availabl

ISSN:0165-0513    

DOI:10.1002/recl.19480670708

出版商:WILEY‐VCH Verlag    

年代:1948

数据来源: WILEY

摘要:

AbstractThe results of the theoretical considerations described in Part I are applied to experiments on chemical absorption of carbon dioxide in alkali hydroxide solutions and in ammoniacal solutions.The calculated values for the rate of absorption prove to be in good agreement with the experimental data.

ISSN:0165-0513    

DOI:10.1002/recl.19480670709

出版商:WILEY‐VCH Verlag    

年代:1948

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19480670701

出版商:WILEY‐VCH Verlag    

年代:1948

数据来源: WILEY