摘要:

AbstractThe preparation and properties of gels of boron phosphate in concentrared sulphuric acid and oleum are described. Boron arscnate gels are also briefly discussed.

ISSN:0368-4075    

DOI:10.1002/jctb.5000671201

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractDuring an investigation into the ageing mechanism of propellent explosives stabilized with syin‐dicthyldiphcnylurea, methods were devised for the separate deterrmination of certain nitrosomines which had been identified as transformation products of the stabilizer. The methods involved the chromatographic separation of the compounds followed by their absorptiometric determination by means of thc α‐naphthylamine reaction. Application to a large number of cordite samples aged under various conditions has yielded information regarding the mechanism of the stabilization and the effect of various factors upon the distribution of the transformation prod

ISSN:0368-4075    

DOI:10.1002/jctb.5000671202

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractThe inorganic constituents of coals are bricfly reviewed and their subsequent history during combustion and carbonization is considered. The cxamination is reported of the zinc‐pyridine complex obtained from a free carbon sample by extraction with water. Examination for other elements is described and the presence of lead, iron, cobalt, manganese and others indicated. The form in which these elements are present is discusse

ISSN:0368-4075    

DOI:10.1002/jctb.5000671203

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractThe So‐called coal tar resins are defined and their preparation from vertical retort tar and pitch is described. The resins are divided into resinols, resinoic acids, resinenes, and resinamines, about 99% consisting of resinenes. The importance of dxygen in these compounds is discussed. Further fractionation of resinencs by precipitation and chromatography and the analyses of the fractions are reported. It appears that the resinols react during the distillation of tar to give higher molccular wegiht resinous compound

ISSN:0368-4075    

DOI:10.1002/jctb.5000671204

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractThe production of sterile pharmaceuticals calls for careful training of the staff concerned and thorough bacteriological control of product, apparatus, premises and technique. This paper (given to the Microbiological Panel, March 10, 1948) discusses some aspects of a system for training and control of this kind.

ISSN:0368-4075    

DOI:10.1002/jctb.5000671205

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractThe resuls of experiments involving the refluxing of benzaldehyde with powdered zinc or iron showed that various reactions took place to produce phyenyl group containing compounds of less oxygen content than benzaldehyde.

ISSN:0368-4075    

DOI:10.1002/jctb.5000671206

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractThe presence of small concentrations of inhibitors (CCl4, Cl2 and HCL) in the air passing into a bed of burning coke is found to increase the CO content of the combustion gases at the expense of the CO2. With sufficient inhibitor (>2.0% CCL4) the effect amounts to almost complete suppresion of the reduction of CO2. The effect is not due to a promotion of the reduction of CO2, this reaction proceeding only to a very smal extent under the conditions of the experiments. Further experiments show that inhibitors cdan prevent the oxidation of 95% of the CO at 1000° in the presence of excess oxygen. if the inhibitor (chlorine) is present in the inlet gases in a concentration greater than a sharply defined critical value (c.0.5%). This is an extension to a high temperature region of the well‐known action of halogen compounds on CO oxidation at lower temperatures. The inhibition of the oxidation of carbon monoxide is found to be most effective when the area of surface of the silica reation vessel is greatest and also when the CO and Cl2 are preheated together; in an empty reaction tube and with the CO preheated separately from the Cl2, no critical Cl2, concentration is found and inhibition is poor.The conclusions from the work on the oxidation of CO are applied to the earlier experiments on coke combustion in the presence of inhibitors; it is inferred from the absence of CO2 in the combustion gases produced in inhibited coke combusion, that CO2 is not formed as a primary product of the interaction between carboon and oxygen, but is always produced by the oxidation of carbon monoxide. This conception is discussed with reference to the “two‐zone theroy” of co

ISSN:0368-4075    

DOI:10.1002/jctb.5000671207

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractDuring the process of diffusion the gas which collects at the top of a diffuser contains a decreasing proportion of carbon dioxide and an increasing proportion of hydorgen. Observations on the respiration of sliced beet suggest that this factor may be largerly responsible for carbon dioxide which appears at the beginning of diffusion, but that the rising remperature in the3 battery soon inhibits further plant respiration. Periodic opening of the release cocks, which occurs during operation of the battery, then trends to replace the gases originally present by those released from the juice. These include the products of fermentation, which consist of carbon dioxide and hydrogen.The thermophilic bacterial flora of the diffusing juice consist maninly of lactobacilli and gas ‐forming anaerobes. These appear to be largely responbible for production of gas, formation of invert sugar, and the appearance in the juiice of small quantities of lactic, butyric, and acetic acids. The temperature relations of the strains of these organisms tested in the laboratory suggest that their activities would be inhibited if the temperature of the battery were consistently maintained above 7

ISSN:0368-4075    

DOI:10.1002/jctb.5000671208

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractAcrylonitrile was urgently required for certai experimental work and the Ministry of Supply Undertook the requiring a minimum of special equipment. The published methods of preparation were reviewed, together with certain information from B.I.O.S. reports on German industrial processes, and a process was finally developed suitable for existing plant. This paper deals with the laboratory and semi‐technical research incidental to the preparation of about 56 1b. of acyrlonitrile starting from ethylene chlorhydri

ISSN:0368-4075    

DOI:10.1002/jctb.5000671209

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractFurther cxperimental work on the photosensitivity of the adsorption of water vapour on wool within the range of atmospheric relative humidity of 5–20% is described, and details are given of the differences in behaviour of samples conditioned on the adsorption and desorption isotherms. Details of discussions with the Wool Industries Research Association concerning the phenomenon are given, together with a suggested altemative electrostatic explanation of the phenomenon. Difficulties encountered in subsequent attempts to reproduce the earlier experiments are described. There appears to be some factor, at present unknown, which controls the appearance or non‐appearance of the eff

ISSN:0368-4075    

DOI:10.1002/jctb.5000671210

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY