摘要:

Freezing point, viscosity, and boiling point data are presented for aqueous solutions oflevo-2,3-butanediol containing methanol, ethanol, ethylene glycol, and tetrahydrofurfuryl alcohol as third components. All four ternary systems show freezing points of −50 °C. and lower over a considerable range of compositions. Among the compounds tested as third components, methanol was most effective as a thinning agent and accessory freezing point depressant. The data indicate that 20% methanol–40% butanediol–40% water is suitable for use at temperatures as low as −50 °C.

ISSN:1923-4287    

DOI:10.1139/cjr46f-032

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

Samples of high wines recovered from three whole wheat mashes fermented byAerobacillus polymyxawere fractionated by rectification. It was shown that the high wine from this fermentation resembles that obtained from a yeast fermentation and that a satisfactory industrial ethanol may be prepared by distillation methods. By preparation of derivatives, acetone, diacetyl, and acetic acid were shown to be present in the high wine.

ISSN:1923-4287    

DOI:10.1139/cjr46f-033

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

The chemical determination of 2,3-butanediol in fermented whole wheat mashes and in certain materials from the recovery process has been investigated from the point of view of process control. The method of analysis involved extraction withn-butanol followed by estimation of the butanediol with periodate oxidation. Errors in both parts of the method were estimated and correction factors determined for the various types of materials. The factors recommended are: 1.039 for pure diol solutions and 1.067 for all other materials. Formulae are given for converting analytical results on beer to a basis of whole mash or beer-still slops. These calculations require a knowledge of the insoluble solids contents of the mash or the slops concerned.

ISSN:1923-4287    

DOI:10.1139/cjr46f-034

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

Considerable quantities of acetone were produced by certain strains ofAerobacillus polymyxagrowing anaerobically in a dextrose medium. The presence of acetone was confirmed by formation of the 2,4-dinitrophenylhydrazine derivative. Carbon balances were obtained for both non-acetone-producing and acetone-producing strains of the organism; considerable quantities of several organic acids were also formed. Increased efficiency of nitrogen-aeration resulted in a marked lowering of the butanediol: ethanol ratio and probably is conducive to an increased yield of acetone.

ISSN:1923-4287    

DOI:10.1139/cjr46f-035

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

Heating liquid egg to 60 °C. reduced the viable bacterial count 85 to 95% but had less effect on the coliform organisms. Holding the liquid at 60 °C. for 30 min. reduced the viable count 98 to 99%, and destroyed the coliforms,Salmonella, andStaphylococci. Quality tests indicated no difference between powders prepared from heated and unheated melange either originally or after storage. Tests with a laboratory flash pasteurizer indicated that a considerable reduction in the number of total viable and coliform organisms occurred when liquid egg was heated from 22° to 60 °C., the total time in the pasteurizer being approximately one minute.

ISSN:1923-4287    

DOI:10.1139/cjr46f-036

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

Froth flotation of water-cooked pebble-milled milkweed seed or mustard screenings yielded 90% of the total oil in the concentrate, which was enriched to twice the oil content of the original seed. Protein and inorganic matter also tended to concentrate in the froth fraction. Optimum conditions for separation required pH values substantially below 7 and pulp densities between 2 and 5%. Iodine numbers of oil and ease of protein peptization differed for concentrate and tailing fractions, showing some fractionation as well as concentration.

ISSN:1923-4287    

DOI:10.1139/cjr46f-037

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

Details of a process for the application of dust-laying oil to cotton fabric are given. The process consists essentially of the mutual coagulation, in the presence of the cotton, of two oppositely charged oil-in-water emulsions. The negative and positive emulsions are stabilized with commercial preparations of sodium ethyl sulphonate methyl-oleamide and cetyldimethylbenzylammonium chloride respectively. The ratio of the two emulsifying agents must be controlled accurately in order to ensure complete coagulation of the oil.The uniformity of oil distribution on the fabric is satisfactory, and there is little or no tendency for fatty acid or oil to build up on repeated laundering and oiling when carried out in a commercial laundry wash wheel. There is some loss of oil owing to deposition on the wheel, so that it is necessary to allow for 7% oiling in order to obtain 4 to 6% on the fabric.

ISSN:1923-4287    

DOI:10.1139/cjr46f-038

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

Results of the measurement of the thermal insulation of a double pile fabric, the thickness of which was varied by compression, are given. Within the limits of the experiments the thermal insulation was found to vary linearly with thickness. The slope of the line corresponds to a value of 4.6 clo per in. thickness. The results are discussed in regard to those obtained by other investigators.

ISSN:1923-4287    

DOI:10.1139/cjr46f-039

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

Preliminary investigations showed a slow rate of production of hexachloroethane from chlorine-saturated liquid tetrachloroethane. The addition of some materials that often accelerate similar reactions was not effective here. However, rapid production was obtained by chlorinating tetrachloroethane in the presence of ultra-violet light. The effective wave-lengths appeared to lie between 3150 Å and 3540 Å, and the temperature coefficient between 75° and 100 °C. was 1.10. The result indicated that production of hexachloroethane from chlorine-saturated liquid tetrachloroethane was feasible. For the same conditions of illumination and temperature hexachloroethane was produced from chlorine-saturated pentachloroethane at a rate two and one-half times as fast as that in chlorine-saturated tetrachloroethane.

ISSN:1923-4287    

DOI:10.1139/cjr46f-040

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

Measurements made under a series of imposed conditions of heat load, dunnage spacing, and air flow were in agreement with previous work in this laboratory in demonstrating (a) the occurrence of appreciable permanent temperature gradients in material, whether exothermic or not, stacked in an air-cooled storage room, and (b) the possibility of markedly reducing these gradients by effective channelling of air through the stack. With end-to-end circulation, blocking of voids in the room was the most important single factor in minimizing intra-stack temperature differentials under the conditions of these tests. Further improvement was effected by the provision of optimum dunnage and by augmenting the air flow. It is to be inferred that with blocked voids, dunnage should be extended to all external surfaces of the stack. The desirability of uniform transverse and vertical distribution of the circulating air was also evident. Further trials on a larger scale are required to explore the practical implications of these findings.

ISSN:1923-4287    

DOI:10.1139/cjr46f-041

出版商:NRC Research Press    

年代:1946

数据来源: NRC