摘要:

AbstractIsothermal oxidation of ferrous sulphate heptahydrate in presence and absence of sodium carbonate has been carried out in the temperature range 205 to 265 °C. The oxidation proceeds in two steps. The rate constants for the oxidation at various temperatures have been calculated. The results indicate that the low temperature mechanism of oxidation proposed earlier does not hold good at higher temperatures

ISSN:0375-9210    

DOI:10.1002/jctb.5020231002

出版商:John Wiley&Sons, Ltd    

年代:1973

数据来源: WILEY

摘要:

AbstractThe rate of hydrolysis of sulphamic acid has been measured over the pH and temperature range of interest to electroplaters. The results have been correlated with accurate results at other temperatures reported in the literature, and are presented as a plot of half‐life of sulphamic acid as a function of pH, from 50 to 95 °C, and as a plot of half‐life against temperature, at pH 1.4, 2 and 3. Guidelines are given for estimating the half‐life at temperatures and pH's not covered by the experimental r

ISSN:0375-9210    

DOI:10.1002/jctb.5020231003

出版商:John Wiley&Sons, Ltd    

年代:1973

数据来源: WILEY

摘要:

AbstractMethods for the determination of O/M ratios in uranium and uranium‐plutonium oxide nuclear fuels are reported based on an extensive literature survey. The salient features, as well as the merits and drawbacks of each method are critically reviewed. The need for a fast direct method, by which the simpler indirect methods may be checked, is met by the carbon‐reduction met

ISSN:0375-9210    

DOI:10.1002/jctb.5020231004

出版商:John Wiley&Sons, Ltd    

年代:1973

数据来源: WILEY

摘要:

AbstractThe reversibility of the reaction CaCO3⇌ CaO+CO2has been examined through a large number of cycles (up to 40), mainly at 866 °C. The decomposition to the oxide is always 100% but the reactivity of the oxide so formed to carbon dioxide falls off markedly after a rapid initial reaction. There is a large increase in surface area on going from the non‐porous calcium carbonate to the oxide and this is due to the formation of pores, mostly very small (<4 nm). The fast component of the back reaction is a surface reaction and the subsequent slow reaction is controlled by the slow diffusion of carbon dioxide through the newly formed carbonate layer. The reversibility of the reaction decreases with the number of cycles, rapidly at first and then more slowly: the first effect is probably due to loss of pore volume in the oxide and the second to sintering of the carbo

ISSN:0375-9210    

DOI:10.1002/jctb.5020231005

出版商:John Wiley&Sons, Ltd    

年代:1973

数据来源: WILEY

摘要:

AbstractEfficiency and intensity of the flotation of isostructural, tetrahedral oxyanions with the cationic (R)4N+type surfactant were examined, exemplified by the case of the diluted aqueous solutions of phosphorus(v), molybdenum(vi) and rhenium(vii) at concent rations of 1 × 10−4, 5 × 10−5and 1 × 10−5kmol m−3. No direct relation was found between the flotation efficiency and the charge and size of the examined ions. For ions of equal charge, the Grieves entropy criterion15was obeyed in

ISSN:0375-9210    

DOI:10.1002/jctb.5020231006

出版商:John Wiley&Sons, Ltd    

年代:1973

数据来源: WILEY

摘要:

Abstract2,6‐Dinitrodiphenylamine and its derivatives were synthesised and shown to have excellent dyeing properties on synthetic fibres. Fastness to light of the dyeings was found to be inferior to those of analogous derivatives of 2‐nitro‐diphenylamine. Reasons for this decreased photochemical stability are disc

ISSN:0375-9210    

DOI:10.1002/jctb.5020231007

出版商:John Wiley&Sons, Ltd    

年代:1973

数据来源: WILEY

摘要:

AbstractIt has been confirmed that when hot products of combustion containing traces of nitrogen oxides are sampled through metal tubes the concentration falls. The mechanism is in part due to the conversion of nitrogen dioxide to nitric oxide. Glass tubing may be used as a substitute at high sampling temperatures and PTFE is suitable at lower temperatures; nylon, EVA and PVC tubing should not be used since significant losses may occur in these materials even at room temperature.

ISSN:0375-9210    

DOI:10.1002/jctb.5020231008

出版商:John Wiley&Sons, Ltd    

年代:1973

数据来源: WILEY

摘要:

AbstractThe kinetics of the oxidation of propionaldehyde by oxygen in the presence of manganese propionate catalyst, in a batch reactor are reported. Experiments are designed to yield a mathematical description of the process. Reaction rate constants are obtained from pattern search technique.

ISSN:0375-9210    

DOI:10.1002/jctb.5020231009

出版商:John Wiley&Sons, Ltd    

年代:1973

数据来源: WILEY

摘要:

AbstractThe decomposition of perpropionic acid, in the presence of manganese propionate catalyst is studied by the capacity‐flow method. The reaction is found to be second order with respect to peracid concentration and first order with respect to catalyst concentration. The activation energy is 10.2 kcal/mol. The mechanism of the reaction is discussed along with the possible modes of by‐product format

ISSN:0375-9210    

DOI:10.1002/jctb.5020231010

出版商:John Wiley&Sons, Ltd    

年代:1973

数据来源: WILEY

ISSN:0375-9210    

DOI:10.1002/jctb.5020231001

出版商:John Wiley&Sons, Ltd    

年代:1973

数据来源: WILEY