摘要:

AbstractThe partition coefficient for thorium between a thorium‐rare earth nitrate solution and a 40% v/v mixture of tri‐n‐butyl phosphate and xylene decreases as the phosphate concentration in the aqueous phase increases. The addition of excess of ferric nitrate gives a complex with the phosphate and facilitates the extraction of thorium. Precipitation of phosphate occurs at pH<1 in solutions containing ∼ 15 g./litre of phosphate (asP2O5), but addition of iron prevents precipitation of phosphate at pH<1 in solutions containing up to 44 g./litre of phosphate (a

ISSN:0021-8871    

DOI:10.1002/jctb.5010090501

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe extraction of thorium from sulphate solution by alkyl phosphates is described, and methods are presented for the recovery of thorium from the organic solution after extraction.

ISSN:0021-8871    

DOI:10.1002/jctb.5010090502

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractSodium sucrates have been investigated as a means of preparing sucrose derivatives from organic halogen compounds. No reaction has been effected with monosodium sucrate and methyl iodide, and this has been attributed to the presence of ammonia or sodamide in the sucrate. A product approximating in composition to a tetra‐O‐allyl sucrose has been obtained in 50% yield from trisodium sucrate and allyl chloride at 122°; allyl sucrose has also been prepared from hexasodium sucrate. Mono., tri‐, penta‐ and hepta‐sodium sucrate react with epichlorohydrin at 135° to give in quantitative yield highly cross‐linked insoluble polymers of the epoxide resin type; mixtures of sucrose and sodium sucrate also give insoluble polymers.Methoxymethyl sucrose, soluble in water and organic solvents, has been prepared from chloromethyl methyl ether and pentasodium sucrate at 15°. Ethylene dichloride reacts with trisodium sucrate at 122–135° but sucrose is the major product formed. o‐Chloronitrobenzene does not react.The reactivity of pentasodium sucrate towards a range of organic compounds has been assessed under mild conditions in the presence of dimethoxyethane: (a) alkyl and aryl chlorides in general do not react at 70–75°, but crotyl chloride is an exception and crotyl sucrose has been prepared in 62% yield; (b) acid chlorides and simple acid anhydrides react readily and 15 crude sucrose esters have been prepared and their solubilities estimated. Terephthaloyl sucrose is a polymer. Complex reactions occur with triphenylmethyl chloride, picryl chloride, 2: 4‐dichlorophenoxyacetyl chloride, a‐chloroacetophenone a

ISSN:0021-8871    

DOI:10.1002/jctb.5010090503

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractMeasurements of the resistance of fire‐fighting foams to radiant heat which have previously been reported are discussed in terms of the reflectivity of foam. It is possible to obtain a simple correlation for most of the data which is in reasonable agreement with a calculated correlatio

ISSN:0021-8871    

DOI:10.1002/jctb.5010090504

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe cathodic polarisation of nickel, aluminium, nickel‐aluminium alloy (2% nickel) and aluminium nickel‐plated with AI/Ni–1:1 and 10:1 under conditions of hydrogen evolution was studied at various temperatures in 3.17% IiCl solution. The results indicate a decrease in polarisation on alloying or plating with nickel, a decrease in polarisation with increasing temperature for nickel and an increase for aluminium under the same conditions. The results are discussed in terms of their effects on the corrosion resistance of aluminium alloys in water at elevated tempera

ISSN:0021-8871    

DOI:10.1002/jctb.5010090505

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractA quantitative study has been made of the oxidation of various coals by sulphuric acid–water mixtures. Two coals of different particle sizes showed identical oxidation rates. A mechanism of the oxidation reaction is suggeste

ISSN:0021-8871    

DOI:10.1002/jctb.5010090506

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe disposal of spent liquors from the pickling of iron by an electrodialytic process is described, sulphuric acid of a concentration suitable for re‐use and metallic iron being recovered. The power cost of the treatment is a function of the current efficiency and the voltage across the cell. Current efficiencies for various concentrations of recovered acid are experimentally obtained and shown to apply to all pickle liquor compositions. Experiments on one synthetic pickle liquor have established a basis for calculating the cell voltage. It is then possible to deduce the quantitative effect on the power cost of the treatment, of operating procedure, electrode‐membrane distances, the iron content of the treated liquor, the proportion of iron in the spent pickle liquor and the total concentration of the spent liq

ISSN:0021-8871    

DOI:10.1002/jctb.5010090507

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY