摘要:

AbstractThe preparation of lubricating oils by the AlCl2polymerisation of the olefines present in the primary product obtained by atmospheric pressure synthesis from carbon monoxide and hydrogen (ratio 1 :2) over a cobalt catalyst has been carried out in 2‐gallon batches. The effect of varying temperature, catalyst and boiling range of starting material on the reaction and its products is described. The oils obtained possess properties which approximate to the requirements of the Air Ministry Specification D.T.D. 109 for aircraft lubricants in all respects except the increase in viscosity on oxidation. It was found possible to overcome this disability subjecting the oils to a carefully controlled hydrogenation in the presence of molybdenum disulphid

ISSN:0368-4075    

DOI:10.1002/jctb.5000650701

出版商:John Wiley&Sons, Ltd    

年代:1946

数据来源: WILEY

摘要:

AbstractThis paper deals with the determination of the plastic and brittle states of bitumens by means of three mechanical tests,viz., tensile strength, ductility and impact.Brittleness is defined us failure due to the hydrostatic component of stress whereas plastic failure is duo to the shear component. This definition leads to suitable tests for brittleness of materials.The ductility teat is applicable to the determination of the strain which the material can conveniently accommodate, whereas the tensile strength test is directly applicable to the matter under consideration, since brittleness deepends on rate of loading and this factor is controlled in this form of test.Impact tests show that all the bitumens tested are brittle when rapidly loaded; the most satisfactory criterion here is the impact energy or what may be determined the brittle strength.

ISSN:0368-4075    

DOI:10.1002/jctb.5000650702

出版商:John Wiley&Sons, Ltd    

年代:1946

数据来源: WILEY

摘要:

AbstractIt has been shown that distilled water may be rendered non‐corrosive by contact with lend powder, litharge and red lead, whilst under the same conditions little or no inhibition was obtained from lead peroxide, lead sulphate, lead chromate, basic lead sulphate, basic lead carbonate, iron oxide and titanium oxide. The inhibition was associated with the passage of lead into solution. Atmospheric carbon dioxide removed the lead from solution by precipitating it as basic lead car be unto. In certain cases, therefore, protection broke down, and the results were not very reproducible. Paints have been prepared from the majority of the pigments mentioned above, by grinding them in a drying oil, and it had been found that so long as the lead pigment was sufficiently basic to form lend soaps it yielded a paint film which was capable of making water non‐corrosive. It was concluded, that inhibition was brought about the soluble lead compounds produced by the hydrolysis of lead soaps, and this was confirmed an examination of the behaviour of a commercial sample of lead linoleate, Tins inhibition was obtained even in the presence of small quantities of electrolytes and atmospheric carbon dioxide. It would seem that the ideal vehicle should contain sufficient acid to ensure adequate soap formation, and should yield a film of maximum water resistance, in order that the soluble inhibitive ingredients may be retained as long as possible. The possible ways in which such a vehicle could be developed are discussed in the paper. The mechanism by which the products of hydrolysis of lead linoleate cause inhibition has been examined, and it is concluded that the soluble lead compounds are adsorbed on the bare metal, and act as anodic adsorption inhibitors. The nature of the adsorbed substance has not been clearly established. The paper contains suggestions for future w

ISSN:0368-4075    

DOI:10.1002/jctb.5000650703

出版商:John Wiley&Sons, Ltd    

年代:1946

数据来源: WILEY

摘要:

AbstractMethods for the preparation of Iodoxyl and Diodone, X‐ray contrast substances for the visualisation of the urinary tract, are given. Improved methods of iodination and methylation are describe

ISSN:0368-4075    

DOI:10.1002/jctb.5000650704

出版商:John Wiley&Sons, Ltd    

年代:1946

数据来源: WILEY

摘要:

AbstractFor many years now the purity of raw‐sugar‐mill molasses has been steady within certain limits and analyses of 60 years ago show marked .similarity with those of to‐day. The reason for this has been obscure, but the writer has now shown that the failure of sucrose to crystallise further from the strongly supersaturated solution (molasses) is duo to the presence of surface activo impurities being adsorbed by tho surfaces of the crystals and thus inhibiting their growth. When these impurities arc removed by the use of excess adsorbent carbon, the sucrose will crystallise practically completely. The reducing sugar‐ash ratio is shown to be unfounded ns a criterion for judging molasses exh

ISSN:0368-4075    

DOI:10.1002/jctb.5000650705

出版商:John Wiley&Sons, Ltd    

年代:1946

数据来源: WILEY

摘要:

AbstractA direct, quantitative method of estimating 0 to 8 p.p.m. of phosphorus (as phosphate) in Morgan's universal extracting solution (U.E.S.) is described in which molybdenum‐blue is formed in 13 mm. diameter tubes and measured by means of the Spekker photo‐electric absorptiometer. 1 ml. of phosphate solution is used, 1 ml. of a sodium molybdate‐hydrochloric acid solution and 0.5 ml. of n stannous chloride‐hydrochloric acid solution. The sodium molybdatc reagent contains sufficient hydrochloric acid to offset neutralisation of the acidity of U.E.S. by calcium carbonate in calcareous soils. The molybdenum‐blue is formed rapidly and is stable for 30 minutes. The relationship between Spekker drum readings and p.p.m. P is linear. The method is applicable to U.E.S. extracts of acid or highly calcareous soils: evidence of its suitability for soil extracts will appear in a la

ISSN:0368-4075    

DOI:10.1002/jctb.5000650706

出版商:John Wiley&Sons, Ltd    

年代:1946

数据来源: WILEY

摘要:

AbstractThe surface area, the surface void volume and the depth of the grain of lithographic printing plates have been measured.

ISSN:0368-4075    

DOI:10.1002/jctb.5000650707

出版商:John Wiley&Sons, Ltd    

年代:1946

数据来源: WILEY

摘要:

AbstractAn examination of the vapours evolved during the heating of magnesium chloride in the presence of ammonium chloride has shown that hydrolysis of the magnesium chloride is not prevented by the presence of the ammonium chloride. The production of anhydrous magnesium chloride is shown to be due to a second reaction occurring at a somewhat higher temperature between the basic product of the hydrolysis and the amonium monium chloride. Anhydrous magnesium chloride may be prepared from a basic chloride, the hydroxide or the oxide of magnesium by heating with ammonium chloride.

ISSN:0368-4075    

DOI:10.1002/jctb.5000650708

出版商:John Wiley&Sons, Ltd    

年代:1946

数据来源: WILEY

ISSN:0368-4075    

DOI:10.1002/jctb.5000650709

出版商:John Wiley&Sons, Ltd    

年代:1946

数据来源: WILEY