摘要:

AbstractAn investigation has been made of the reaction between monazite, chlorine and either carbon or carbon monoxide. Conditions have been established for obtaining yields up to 90% of relatively pure rare earth chlorides at chlorine efficiencies in excess of 50% The thorium content of monazite is shown to react with chlorine much more slowly than the rare earth elements. The nature of the volatile products of the reaction has been investigated and the mechanism of the reaction discussed.

ISSN:0368-4075    

DOI:10.1002/jctb.5000690101

出版商:John Wiley&Sons, Ltd    

年代:1950

数据来源: WILEY

摘要:

AbstractThe flow of water through starch held in a perforated basket centrifuge has been related to the dimensions of the system by equating the centrifugal driving force on the liquid to the frictional resistance to flow through the cake. The analysis has been tested by using “critical wetting” conditions with the liquid surface coinciding with the inner surface of the cake. Values of the permeability in the centrifuge differ greatly from those found in normal filtration zests on samples cut from the centrifuge cakes. The possible explanations of this difference have been discus

ISSN:0368-4075    

DOI:10.1002/jctb.5000690102

出版商:John Wiley&Sons, Ltd    

年代:1950

数据来源: WILEY

摘要:

AbstractParts II, III and IV of this series deal with the component acids of Niger seed, safflower and sunflower seed oils from different parts of Africa. The linoleic acid content of such oils may range from over 70% to somewhat below 50%; the oils of high linoleic acid content possess excellent drying properties, coupled with absence of yellowing during ageing of the resulting paint film.In this paper the component acids of the oil of Niger seed grown in Southern Rhodesia have been studied and found to contain about 73% of linoleic acid and 1%, of linolenic acid, with 7% of oleic and about 19%, a of saturated (palmitic and stearic) acids. So far as the present (somewhat meagre) records go, it appears that African Niger seed oils may usually approximate to this composition, whereas Niger seed grown in India yields oils with only about 50% (or slightly more) of linoleic acid.

ISSN:0368-4075    

DOI:10.1002/jctb.5000690103

出版商:John Wiley&Sons, Ltd    

年代:1950

数据来源: WILEY

摘要:

AbstractLike Niger seed oils (Part II) and sunflower seed oils (Part IV), safflower seed oils may vary somewhat widely in their content of Iinoleic acid; oils from Asiatic and some other sources contain 60%, or less, but other seeds grown in America or Australia furnish oils in which linoleic acid forms up to about 77% of the total fatty acids. Such oils contain negligible proportions of linolenic acid, and are excellent non‐yellowing drying oils. Safflower seed grown in Kenya has been examined and found to give oil practically identical with a recently described Australian oil, its component acids being palmitic 6·4, stearic 3·1, arachidic 0·2, oleic 13·4, and linoleic 76·9%

ISSN:0368-4075    

DOI:10.1002/jctb.5000690104

出版商:John Wiley&Sons, Ltd    

年代:1950

数据来源: WILEY

摘要:

AbstractThe fatty oils from ten specimens of African sunflower seed from widely different areas, and an Argentine sunflower seed oil have been studied. The iodine values of the oils raged from 113–136, their linoleic acid contents from 44% to 72% and their oleic acid contents from 43% to 14%. Sunflower seed oils in which linoleic acid forms about 70% or more of the total fatty acids are excellent non‐yellowing drying oils. Although the results reported in this paper are insufficient to define whether the wide variations in the proportions of linoleic and oleic acids arc due to environmental or varietal causes, there is reason to consider that the environment of the sunflower plant exerts a much greater influence on the composition of the oil than differences in the variety of seed gr

ISSN:0368-4075    

DOI:10.1002/jctb.5000690105

出版商:John Wiley&Sons, Ltd    

年代:1950

数据来源: WILEY

摘要:

AbstractThe formation of CO from acetylene during combustion was studied by burning vertical acetylene flames in atmospheres consisting of O2and N2in known proportions. This has been found to be governed mainly by the percentage oxygen in the inlet gas and its rate of supply to the combustion chamber. Carbon monoxide is produced from a vertical acetylene flame over the whole range of inlet gas compositions containing from 21% O2downwards to the extinction point. When the percentage O2, in the inlet gas is reduced to a value approaching that of the extinction point, CO is produced in quantities exceeding 0·1. The effect of the addition of CO2to the inlet gas is to increase the quantity of CO formed

ISSN:0368-4075    

DOI:10.1002/jctb.5000690106

出版商:John Wiley&Sons, Ltd    

年代:1950

数据来源: WILEY

摘要:

AbstractMethods have been developed for the estimation of radioactive strontium, barium, cobalt and iodine in river water down to 10−10–10−11curie, I. The methods involve chemical separations for each element in turn, followed by pray counting under sufficiently sensitive conditions. The recommended chemical separations arc briefly as follows:(1)For combined strontium and barium.—The water sample is evaporated to 3 small bulk with the addition of sodium carbonate solution. The precipitated carbonates arc treated with 80% nitric acid, which dissolves everything but strontium and barium nitrates and 3 mainly siliceous residue. The mixed nitrates arc dissolved in water, and the carbonates precipitated for counting.(2)For strontium and barium separately.—The usual chromate method is employed.(3)For cobalt.—The water sample is evaporated down with nitric acid. Ammonium cobaltothiocyanate is extracted with a mixed amyl alcohol‐ether solvent. The cobalt is precipitated 3s ferrocyanide for counting.(4)For iodine.—The iodine is estracted from the water sample by means of carbon tetrachloride, and precipitated as silver iodi

ISSN:0368-4075    

DOI:10.1002/jctb.5000690107

出版商:John Wiley&Sons, Ltd    

年代:1950

数据来源: WILEY

摘要:

AbstractThe hydrogen evolved when magnesium billet (arsenic‐free, but found to contain phosphorus) is dissolved in dilute acid contains phosphine, but no acetylene, as also docs the air in the immediate vicinity of magnesium powder during manufacture of the latter from bulk meta

ISSN:0368-4075    

DOI:10.1002/jctb.5000690108

出版商:John Wiley&Sons, Ltd    

年代:1950

数据来源: WILEY

摘要:

AbstractThe rates of decomposition of carotene in liquid paraffin and in hydrogenated coconut oil under accelerated conditions at 100° C. with forced aeration have been investigated. In the case of paraffin containing less than 50μg./ml., the rate is shown to be proportional to the log. of the concentration. The spectral changes occurring during oxidation at 100° c. and irradiation at room temperature hare also been followed and it is shown that the estimation of vitaminAin the presence of oxidized carotene by direct spectroscopic measurement is possible provided a simple correction is applied. Hydrogenated Coconut oil is suggested as a suitable solvent for carotene in feeding trial wo

ISSN:0368-4075    

DOI:10.1002/jctb.5000690109

出版商:John Wiley&Sons, Ltd    

年代:1950

数据来源: WILEY