摘要:

AbstractIn further experiments on the adsorption of n‐alkyltrimethylammonium corrosion inhibitors at a dropping mercury electrode in N‐potassium chloride solution, the potential applied to the dropping mercury electrode was taken as far as ‐1.9 volts S.C.E. The electrocapillary and differential capacitance curves for n‐dodecyl‐and n‐hexadecyltrimethylammonium bromides in N‐potassium chloride were generally similar to those in N‐sulphuric acid, and the calculated surface concentrations of the adsorbed quaternary ammonium ions were almost the same.The wider range of potential in the present experiments enabled the desorption peaks in the differential capacitance curves for the more dilute solutions to be demonstrated. The stronger solutions gave subsidiary peaks, or steps, which may be associated with the formation of double or multiple layers.The results of these and previous experiments are explained on the basis that the adsorbed layer of n‐alkyltrimethylammonium ions does not completely exclude solvated ions, but hinders their approach to

ISSN:0021-8871    

DOI:10.1002/jctb.5010170601

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractThe reaction between kaolinite and silicon tetrafluoride has been studied over the temperature range 300–700°. Above the dehydroxylation temperature of kaolinite the formation of metakaolinite was accompanied by an increase in sample weight rather than a loss. In the presence of an excess of SiF4the reaction products showed signs of interaction with one another, possibly to form a fluoroalumina

ISSN:0021-8871    

DOI:10.1002/jctb.5010170602

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractThe foam‐separation process may be utilised for the separation of hydrophobic (and hydrophilic) colloidal particulates of a flocculent nature from aqueous suspension by the addition of a surfactant with opposite charge and by gas dispersion through the suspension. Process operation and the significant independent and dependent variables are discussed. A model is presented that divides the process into a basic separation step in which the oleophilic particles are adsorbed at the gas/suspension interfaces of the bubbles and an entrainment step in which bulk solution is physically carried into the foam. The model is used to interpret experimental results for the ferric oxide‐dodecyl sodium sulphate system, from consideration of residual ferric oxide concentrations, foam volumes, and removal ratios. A parameter, relative fractionation, is used to compare quantities of surfactant and particulates in the foam and in the bulk solution. Results are used to contrast the effects of surfactants on the foam separation of various particulates of opposite charge, includingEscherichia coli, stannic oxide and kaolin clay, with particular emphasis on effects on foaming abil

ISSN:0021-8871    

DOI:10.1002/jctb.5010170603

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractTernary phase‐equilibrium diagrams are presented for theo‐ andp‐isomers of chloronitrobenzene with anhydrous methanol and with 90% aqueous solutions of methanol, ethanol and propanol. by means of a leaching process with 90% aqueous methanol, it is possible to obtain some 75% of thep‐isomer in a pure form from a mixture initially containingo‐ andp‐isomers in th

ISSN:0021-8871    

DOI:10.1002/jctb.5010170604

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractThe examination by microscopy andX‐ray diffraction, of fine crystalline powders embedded in polyvinyl chloride is described. These techniques are applied to an investigation of the stabilising reaction of white lead during thermal degradation of PVC. It is shown that the white lead reacts as a compound, being completely converted to lead chloride by the time hydrogen chloride gas is evolved from the PVC specimen. An unidentified intermediate crystalline phase is also formed. Both this phase and the final lead chloride, nucleate at sites away from the white‐lead stabiliser particles, which indicates that lead compounds must have a solubility in hot PVC plastic. During the thermal degradation neither normal lead carbonate nor gas bubbles have been detected.The PVC fabrication processes cause the stabiliser crystallites to take up preferred orientation and this makes microscopic examination of the crystallites easier, but can cause difficulty in identification byX‐ray diffra

ISSN:0021-8871    

DOI:10.1002/jctb.5010170605

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractThe decomposition of ferrous hydroxide in aqueous suspension at 300° and in PTFE containers has been studied. The reaction rate is slow but is catalysed by nickel and platinum. This explains the results of earlier workers who have found the decomposition of ferrous hydroxide supported in metallic containers to be rapid

ISSN:0021-8871    

DOI:10.1002/jctb.5010170606

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractTraditionally, limits on H2S concentration in town gas have been fixed on the basis of non‐discoloration of lead acetate paper when this is exposed to the gas in a specified manner. Most countries specify their own particular apparatus and conditions for carrying out this test. The limiting concentration of H2S which produces a positive discoloration of the lead acetate paper was investigated with special reference to the U.K., French and German national gas acceptance tests, using Dutch natural gas in both the saturated and dry condition in every case.H2S was introduced into the gas at a controlled rate by a dynamic line blending procedure. The actual concentration of H2S present was checked by an automated version of the methylene blue colorimetric procedure.The U.K. tests gave borderline fails at 1.3 and 1.2 ppm for dry and saturated gas, respectively. These results differ markedly from those obtained with the French and German test methods. It may be inferred, therefore, that the maximum acceptable H2S concentration in gas is best fixed by a numerical limit, which is in line with true technical needs, rather than by a qualitative procedure which can be different for different parts of the same distribution syste

ISSN:0021-8871    

DOI:10.1002/jctb.5010170607

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

ISSN:0021-8871    

DOI:10.1002/jctb.5010170608

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

ISSN:0021-8871    

DOI:10.1002/jctb.5010170609

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY