摘要:

AbstractThe rates of combination of sulphur dioxide and oxygen at a mild steel surface at various temperatures with dry and moist gases have been measured. Sulphide and sulphate formation is found to occur simultaneously, the sulphide being concentrated near to the surface of the basis steel. The rate of sulphate formation is greatest between 580° and 635° corresponding to the maximum catalytic activity of Fe Oa. Water vapour inhibits sulphide and sulphate formation, but increases the rate of oxidatio

ISSN:0368-4075    

DOI:10.1002/jctb.5000671101

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractResults are presented for the corrosion of mild steel, aluminium sprayed and aluminized steel by air containing from 2%‐6% SO2, at temperatures of 300°‐700°. The influence of gas velocity, temperature, and concentration of SO2has been found. Corrosion time curves up to 40 hours' exposure are given for 0.2% and 4% SO2‐air mixtures at 600°. Small concentrations of water vapour in the gas decrease corrosion of mild steel, but further additions increase corrosion. The results show that the catalytic formation of sulphur trioxide on the surface of the metals is of great importance in determining the rate of c

ISSN:0368-4075    

DOI:10.1002/jctb.5000671102

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractThe interaction of fruit juices and aluminium has been investigated to provide a basis for the development of the uses of aluminium in the industry. It has been found that pure aluminium and Al‐Mn and Al‐Mg alloys are eminently suitable for the transport and storage of apple and blackcurrant juices. They are also suitable for citrus juices if the sulphur dioxide preservative is suitably control

ISSN:0368-4075    

DOI:10.1002/jctb.5000671103

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractSilicon monoxide is released when various mixtures of silicates and carbon are heated above 1200°. On leading this into a coal gas flame containing sulphur oxides the initial high dewpoint due to the presence of sulphur trioxide is reduced. Similar results arc obtained when a silica smoke is produced by the disintegration and subsequent oxidation of alkyl silicates sprayed into the flame. The significance of dewpoint measurements in the presence of silica smokes is discussed and it is considered that there is a definite reduction in the sulphur trioxide content of the combustion gases. The mechanism whereby this is brought about is discussed

ISSN:0368-4075    

DOI:10.1002/jctb.5000671104

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractGenerally, in this paper, there are reviewed some of the factors influencing the properties of plastics, and additional evidence is provided through data on the rebound resilience; temperature relationships, for the current ideas on the plasticizer‐polymer interaction. Probably through the inferiority of mechanical tests compared with those of an electrical nature (Wurstlin, loc. cit.), the data are not so precise as to be quantitative but at least are of such a nature as to give further suport to the general theory of plasticizer viscosity and especially the relationship between the temperature dependence of plasticizer viscosity and that of plasticized compound

ISSN:0368-4075    

DOI:10.1002/jctb.5000671105

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractA method is described for the estimation of alginic acid in seaseed samples, using the color reaction with carbazole and sulphuric acid, which can be applied on a micro scale, and is more rapid than the technique previously adopted.

ISSN:0368-4075    

DOI:10.1002/jctb.5000671106

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractVarious methods available for the determination of the insoluble matter of coal tar are briefly reviewed and published work on the nature of free carbon and the coal‐tar resins is considered. The problems associated with free carbon are introduced and the scope of the investigation proposed is outline

ISSN:0368-4075    

DOI:10.1002/jctb.5000671107

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractThe effect of previous conditions of preparation and storage of coal tars on the amount of fre carbon determined by insolubility in toluene has been investigated. Pressure is shown to have little effect but at atmospheric pressure there is progressive increase in free carbon. With rising temperature two effects occur, a reversible increased solubility and an irreversible increase in free carbon which predominates at higher temperatures. The Chemical nature of free carbon is examined and C1 and C2 are distinguished by their chemical and physical properties. A comparison is made of free carbon obtained by centriguging with that obtained by precipitation.In undertaking a study of the occurrence and nature of I “free carbon” in coal tars it was considered desirable first to investigate the effect of time, temperature, pressure, etc., on the quantitative yield of free carbon, and then to consider the general chemical nature of the materi

ISSN:0368-4075    

DOI:10.1002/jctb.5000671108

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractAn account is given of an investigation carried out at the Chemical Research Laboratory, Teddington, on the fibre‐forming polyester, polyethylene terephthalate which was recently announced by the calico Printers' Association and Imperial chemical Industries under the registered name of “Terylene.” The major part of the investigation was carried out under extra‐mural contract with the Ministry of supply, and in collaboration with the Calico Printers' Association, but the latter part was carried out independently. the polyester is obtained from ethylene glycol and methyl terephthalate by ester interchange, and its preparation is covered by B.P. 578079 (Whinfield and Dickson).To prepare the necessary large of terephthalic acid, p‐cymene was oxidized with nitric acid and the product further oxidized with potassium permanganate to terephthalic acid. This was esterified, and purified by vacuum distilation and subsequent crystallization. The condensation of glycol and methyl terephthalate was carried out both in glass and in metal apparatus: the form of apparatus employed and the conditions of preparation are fully described . Attempts to produce satisfactory filaments by extruding the melt under a high pressure of nitrogen were unsuccesful, partly because the solid polyester suffers degradation when melted and so yields week filaments, and partly because the filaments contain bubbles due to liberation of dissolved nitrogen. Filaments were prepared by extruding the polyester from a glass apparatus immediately after preparation. The filament was cold‐drawn into fibre by passage through two pairs of mechanically driven rolls geared in the ratio of 1:4. The maximum strength of the fibre was 5 g. per denier, and the extension at break was about 12%. The water‐absorption of the fibre was very low, but the dielectric properties were not outstanding. Photomicrographs of filaments and fibres illustrate certain faults which were encountered, and attention is drawn to the fact that although the filament is transparent the fibre is subtantially opaque. The cause of this opacity is discussed.It is concluded that the maximum strength of polyethylene terephthalate fibre was not reacdhed. The observed properties of the fibre and the fact that it can be produced in metal apparatus suggested that industrial development was desirable. This development was undertaken by Imperial Chemic

ISSN:0368-4075    

DOI:10.1002/jctb.5000671109

出版商:John Wiley&Sons, Ltd    

年代:1948

数据来源: WILEY