摘要:

AbstractA recent paper by Heeley&Little5is examined in the light of some experiments on the corrosion resistance of some Ti‐stabilised 18Cr‐8Ni steels in hot 30% nitric acid. It is inferred that the corrosion rate after prior sensitisation at 650° is determined by the thickness of a layer of exfoliated material dissolving at its outer surface as fast as it is formed and that equilibrium is not reached until the third week of test. The relevance of different types of laboratory tests to plant conditions is discu

ISSN:0021-8871    

DOI:10.1002/jctb.5010090101

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe influence of the source of an ammoniacal liquor on its composition is indicated. Analysis of liquors is discussed with special reference to the determination of amounts of organic constituents. Loss of phenols during analysis by oxidation in alkalis and pitch formation on distillation can be eliminated by using chromatographic separations.

ISSN:0021-8871    

DOI:10.1002/jctb.5010090102

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe procedure adopted consists in placing 1 ml. of an acidified amnioniacal liquor on an acidified Celite column and elution withcyclohexane to obtain all the monohydric phenols in one band, except phenol which follows as a separate band. The dihydric phenols are then eluted separately or in groups of isomers by the addition of butanol in successively increasing amounts to thecyclohexane eluent. The monohydric phenols are separated on a second Celite column impregnated with sodium silicate solution by elution withcyclohexane. Amounts of all the compounds are determined directly in the eluates by ultra‐violet spectrophotometr

ISSN:0021-8871    

DOI:10.1002/jctb.5010090103

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractNon‐ionic (fully esterified) phosphorylated polymers such as that from triallyl phosphate, (TAP)*, adsorb uranyl nitrate, cobaltous nitrate, lithium chloride and ferric chloride from solutions of the salts in acetone, acetone‐ether, and alcohol. The distribution coefficients betweenTAPand acetone are high (>10 to>103in favour of the polymer), and both ration and anion are equally adsorbed. The salts are probably distributed in accordance with the relative Lewis ‘basicities’ of the resin and liquid phase and the entropy changes in the system following adsorption, and they can be eluted with solvents of equal or greater basicity than (TAP), such as tributyl phosphate, dimethyl‐formamide or aqueous acetone. Adsorption takes place through Werner or addition complex formation between the functional (donor) oxygens in the resin and the metallic component of the salts, and in the case of uranyl nitrate the adsorbed complex is probably UO2(NO3)2,(TAP)2. Phosphine oxide resins have not been synthesised, but the high distributions of uranyl nitrate between tributylphosphine oxide and water is an indication that an analogous polymer would adsorb uranyl nitrate from water. Advantages of non‐ionic resins are rapid removal of cation and anion in one stage from solvents, and subsequent ease of regeneration compared with conventional ion

ISSN:0021-8871    

DOI:10.1002/jctb.5010090104

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractA preliminary investigation of the adsorption properties of ionic diallyl phosphate polymers has been conducted. Sodium diallyl phosphate polymer (NaDAP), separates hexavalent uranium (UO22+) quantitatively from alkaline earths (Ca and Sr), ferric and divalent elements of the first transitional period, aluminium and lanthanides dissolved together in a 2% w/v solution of disodium ethylene‐diaminetetra‐acetate. Unlike in quantitative separations of uranium from other cations by anion exchangers, the presence of sulphuric acid and the reduction of ferric to ferrous ion is not essential withNaDAP, and nitrate, chloride or perchlorate anions do not interfere. Elution of the adsorbed uranium is conducted with a solution of sodium carbonate. Separation from thorium and fission product β‐activity (after 96 hours' decay) under similar conditions was 91% and 92% respectively. The adsorption sequence for the resin is Th4+>Fe3+>UO22+>La3+>Cu2+>Ca2+>Na. From analogy with complexes formed with dibutyl phosphate and the high affinity of the resin for polyvalent cations it appears that these are adsorbed through the formation of stable foru‐membered ring complexes with the resin functional groups. An equivalent of acid is liberated for each equivalent of uranyl and ferric ion adsorbed by acid diallyl phosphate polyme

ISSN:0021-8871    

DOI:10.1002/jctb.5010090105

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractAn accelerated test for susceptibility to intergranular corrosion has been applied to a number of aluminium‐copper alloys whose service corrosion behaviour is known. In all cases, where intergranular corrosion occurred in service, the samples showed the same type of corrosion in the test solution. There was good correlation between the type of attack in the test solution and the K value (ml./cm.2/min.2) relating the volume of gas evolved in the test and the square of the time of effective attack. Factors which affect service performance are discusse

ISSN:0021-8871    

DOI:10.1002/jctb.5010090106

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe contribution which analysis of the products of corrosion can make to the methods of investigating the causes of corrosion of aluminium alloys in service, is described and illustrated with analyses of actual samples. The prevalence of corrosion involving either chloride or heavy metal ions is indicated by a summary of the results of 130 cases investigated.

ISSN:0021-8871    

DOI:10.1002/jctb.5010090107

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractA study has been made of the sedimentation behaviour, sedimentation volume and bulk density of the precipitates obtained by seeding sodium aluminate solutions with hydrargillite in presence of glucose, sugar and starch.With glucose and sugar, sedimentation is free and sedimentation volume small, but with starch, aggregated sedimentation occurs and sedimentation volume is large.To explain the results, it is postulated that glucose and sugar combine with Al3+or Al(OH)3molecules and that starch is chemisorbed on the particles of seed material.

ISSN:0021-8871    

DOI:10.1002/jctb.5010090108

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractExplosives consisting solely of 15% or 20% of ‘C′ nitroglycerine (containing 20% of nitroglycol) on sodium chloride have been prepared using sodium chloride of different specific surfaces and ranging in particle size from 10 to 1000μ. The safety of these explosives in firedamp when fired from a shothole and stemmed with one clay plug, as in the Home Office test for permitted explosives, has been examined. It has been found that the ignition hazard is dependent on the particle size of salt used. Provided that the salt is fine enough, no ignitions are obse

ISSN:0021-8871    

DOI:10.1002/jctb.5010090109

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY