摘要:

AbstractThe corrosion rates and inhibitor efficiencies have been determined for 99.5% aluminium in hydrochloric acid solutions, with the following inhibitors : acridine, thiourea, nicotinic acid, dextrin and tannic acid, of which acridine is the best. Polarisation studies with thiourea show that anodic polarisation is negligible, whereas cathodic polarisation is considerable, so that the corrosion process with this inhibitor appears to be essentially under cathodic control.

ISSN:0021-8871    

DOI:10.1002/jctb.5010110801

出版商:John Wiley&Sons, Ltd    

年代:1961

数据来源: WILEY

摘要:

AbstractExpressions are derived that relate the yield by fractional crystallisation of a melt, to the impurities in the feed and product. The application of the expressions to the purification of benzene is given to illustrate the validity of the expressions.

ISSN:0021-8871    

DOI:10.1002/jctb.5010110802

出版商:John Wiley&Sons, Ltd    

年代:1961

数据来源: WILEY

摘要:

AbstractAn investigation has been made of the relationship between the ‘water requirement’ of gypsum plaster, the surface area of the plaster determined by gas adsorption and by permeability to air, and the bulk volume. The water requirement will undoubtedly depend upon the factors determining the surface area of the plaster, i.e. the particle size and shape, but the results show that other factors exert strong effects. The water requirement of hemihydrate prepared by still methods is shown to be considerably reduced by grinding in a mortar with a pestle, which increases the surface area. In contrast to its marked effects upon the rate of setting, recalcination does not affect the water requirement. There is a pronounced correlation between the water requirement and bulk volume. It appears that the factors that determine the bulk volume also play a large part in determining the water requirement. These factors involve the condition of the surface of the particles rather than their size and sh

ISSN:0021-8871    

DOI:10.1002/jctb.5010110803

出版商:John Wiley&Sons, Ltd    

年代:1961

数据来源: WILEY

摘要:

AbstractThe distribution of14C between the various carbon atoms in the C6and C7chains of the product formed when a mixture of H2, C2H4and14CO is passed over a cobalt Fischer–Tropsch catalyst has been determined. Most of the radioactivity is concentrated in the carbon atoms in the centre of the chains. Some conclusions are drawn regarding the relative rǒles of adsorbed hydrocarbon and oxygen‐containing radicals in the formation of hydrocarbon ch

ISSN:0021-8871    

DOI:10.1002/jctb.5010110804

出版商:John Wiley&Sons, Ltd    

年代:1961

数据来源: WILEY

摘要:

AbstractInteraction between coal particles and oil droplets suspended in an aqueous electrolyte solution can result in collision (defined). Two energy barriers may hinder such interaction : (1) is the result of the interpenetration of the electrical double layers surrounding the surfaces when they have similar sign (2) which prevents spreading of the oil over the wet coal surface and leads to a difference between the advancing and receding contact angles. With an experimental system such that the kinetic energy available to overcome these energy barriers is controlled at a known value, it is shown that three kinds of behaviour can occur : (a) when the kinetic energy is less than the repulsion energy, collision between coal particles and oil droplets does not occur in such a way as to permit permanent attachment of oil to coal; (b) if the kinetic energy is much larger than the repulsion energy, collision occurs but does not necessarily produce coal surfaces which permit flotation of the coal. This is interpreted as meaning that if flotation is impossible the oil has not spread over the coal surface (c) in case (b) if a suitable surface‐active reagent is already adsorbed at the coal surface the oil spreads spontaneously over the surface and air can displace water at the air‐water‐solid interface. This behaviour is held to confirm the model of conditioning and flotation se

ISSN:0021-8871    

DOI:10.1002/jctb.5010110805

出版商:John Wiley&Sons, Ltd    

年代:1961

数据来源: WILEY

摘要:

AbstractA method has been devised for recovering from surface dressings 30‐g. quantities of cutback or penetration‐grade bitumen. This gives sufficient material for a determination of the viscosity in a Couette viscometer. The method was developed to investigate the rate of hardening on the road of cutback bitumens used in surface dress

ISSN:0021-8871    

DOI:10.1002/jctb.5010110806

出版商:John Wiley&Sons, Ltd    

年代:1961

数据来源: WILEY