摘要:

Aqueous extracts of "raw humus" from a typical Quebec podsol soil have been studied by means of two methods of fractionation. The presence of free acetic acid and mannitol has been established, and evidence of the presence of formic acid has been obtained. Data are presented which show that a number of organic acids are present in small quantities.

ISSN:1923-4287    

DOI:10.1139/cjr37b-034

出版商:NRC Research Press    

年代:1937

数据来源: NRC

摘要:

The uncertainties as to structures in the 3, 4–diphenylchlorocyclopentenones have been cleared up by the synthesis of all four possible isomers and a study of their reactions. The investigation of the related indones has been continued, and an interpretation of new evidence is suggested.

ISSN:1923-4287    

DOI:10.1139/cjr37b-035

出版商:NRC Research Press    

年代:1937

数据来源: NRC

摘要:

The reactions which occur when dicalcium ferrite and tetracalcium alumino-ferrite are exposed to saturated steam at temperatures between 100° and 300 °C. were studied by determining the water absorbed and the optical properties and X-ray diffraction patterns of the products. The hydration of the probable products of decomposition under the same conditions was also studied. The main results were as follows:Precipitated alumina, treated between 170° and 350 °C. and then dried over calcium oxide or "dehydrite" at 21 °C., gives a monohydrate of alumina. The product is the same whether the initial alumina contains excess combined water or has been dehydrated at any temperature below about 920 °C. On similar treatment between 100° and 170 °C. precipitated ferric oxide loses its water of hydration, giving a material with the crystalline structure of hematite. Tricalcium aluminate at temperatures between 150° and 300 °C. forms the isometric hexahydrate.On prolonged exposure between 100° and 300 °C, dicalcium ferrite is completely decomposed to calcium hydroxide and ferric oxide (hematite). The first step appears to be a rapid direct hydration of the dicalcium ferrite to a dihydrate, followed by a rapid liberation of one mole of calcium hydroxide. Then follows a slow decomposition of the hydrated monocalcium ferrite with the formation of hematite.Similar treatment of tetracalcium aluminoferrite at temperatures from 100° to 300 °C. gives as final products the hexahydrate of tricalcium aluminate, calcium hydroxide, and ferric oxide (hematite). Here again a very rapid action appears to take place, producing the hexahydrate of tricalcium aluminate and hydrated monocalcium ferrite, the latter product then decomposing slowly to calcium hydroxide and ferric oxide as in the case of the dicalcium ferrite.

ISSN:1923-4287    

DOI:10.1139/cjr37b-036

出版商:NRC Research Press    

年代:1937

数据来源: NRC

摘要:

The amount of water sorbed from vapor by cellulose which had been previously dried was compared with that retained in equilibrium with the same atmosphere by the same sample after having been saturated. The difference between the two values was constant regardless of the presence of air within the limits 10−2to 10−5 mm. air pressure.

ISSN:1923-4287    

DOI:10.1139/cjr37b-037

出版商:NRC Research Press    

年代:1937

数据来源: NRC

摘要:

The relation between the density, pressure, and temperature of a 2:1 and of a 1:1 mixture of hydrogen chloride and propylene has been determined over the temperature range 78° to 115 °C. and up to pressures of 115 atm. These determinations are of interest in connection with the investigation of the influence of a "structure" of the liquid state on reaction velocity. Some preliminary measurements of reaction velocity in the critical temperature-pressure region have been made.

ISSN:1923-4287    

DOI:10.1139/cjr37b-038

出版商:NRC Research Press    

年代:1937

数据来源: NRC