摘要:

The composition of aluminium stearate as normally prepared approximates that of the distearate. Extraction over extended periods, using ethyl alcohol, acetone, and methyl ethyl ketone as extractants, reduced the proportion of stearic acid to that of a monobasic soap. Excess stearic acid over that represented by the monostearate is adsorbed and removable by solvent extraction. In the presence of moisture, extensive hydrolysis occurs, leading to a large excess of alumina. The results obtained by solvent extraction are corroborated by the indicator titration and electrometric titration experiments. It is concluded that aluminium stearate is monobasic only, and that neither the distearate nor the tristearate exists.

ISSN:1923-4287    

DOI:10.1139/cjr48b-015

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

The literature on the chemistry of methyl-bis-β-chloroethylamine is reviewed. The hydrolysis of the dimer is shown to proceed through a unimolecular mechanism whose rate expression is given byk = 1.0 × 1014e−29400/RThr.−1. Secondary processes of higher activation energy are observed.

ISSN:1923-4287    

DOI:10.1139/cjr48b-016

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

It has been shown analytically that for this reaction the formation of Cl−agrees with S2O3−disappearance. The approximate first order rate-controlling step is postulated to be dependent on an ionization mechanism. The rate expression calculated from initial rate constants is given approximately byk = 4.0 × 1015e−25,500/RThr.−1.

ISSN:1923-4287    

DOI:10.1139/cjr48b-017

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

The principal reaction of methyl-bis-β-chloroethylamine in methanol is dimerization, which results in one chlorine from each molecule becoming ionic, but this is accompanied by slight alcoholysis. The rate-controlling step is believed to be the first order formation of an ethylenimonium ion which reacts rapidly with one of its kind to form dimer. The rate expression as calculated from initial rate constants isk(initial) = 4.0 × 1013e−19600/RThr.−1.

ISSN:1923-4287    

DOI:10.1139/cjr48b-018

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

The kinetics of the reactions of methyl-bis-β-chloroethylamine in acetone–water solutions which were 2, 4, 8, 16 and 27 Mwith respect to water have been studied. The principal reaction forms a piperazinium dimer, but hydrolysis also occurs. The rate has been found essentially first order with respect to disappearance of the amine in solutions 27 Min water. In solvents of lower water content the first order rate constants are unsatisfactory owing to changes in water content of the medium and retardation by chloride ion.

ISSN:1923-4287    

DOI:10.1139/cjr48b-019

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

The hydrolysis of the quaternary ammonium salts of methyl-bis-β-chloroethylamine is inhibited by both hydrogen ions and chloride ions. I he kinetics of hydrolysis in various anion solutions suggest that reaction occurs by direct attack at the β-chlorine atoms by hydroxyl ion.

ISSN:1923-4287    

DOI:10.1139/cjr48b-020

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

A simple inexpensive apparatus was devised that could be used to carry out routine analyses of small samples of natural gas, or similar mixtures of lower boiling hydrocarbons, with an accuracy of 0.1% or better. The apparatus operates at low temperatures and pressures and can fractionate as little as 60 cc. A complete analysis takes about two and one-half hours and consumes 3 lb. of liquid air.

ISSN:1923-4287    

DOI:10.1139/cjr48b-021

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

By using a MacMichael viscometer the change in viscosity at various rates of shear was determined for solutions of various types of nitrocellulose in the solvents; acetone,n-butyl acetate, Hercules' mixed solvent, and dibutyl phthalate. It was found that all solutions of low intrinsic viscosity nitrocellulose were dilatant in dilute solution, while those of high intrinsic viscosity were thixotropic. Thixotropy also changed with concentration, the solutions studied going from dilatant to thixotropic through Newtonian types on increasing the concentration. Thixotropy and dilatancy were both found to decrease as the temperature increased. At a given concentration, both the viscosity and the structural viscosity of solutions varied with solvent, dibutyl phthalate giving both the highest viscosity figures and the greatest effect on structural viscosity.

ISSN:1923-4287    

DOI:10.1139/cjr48b-022

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr48b-023

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

The intrinsic viscosity of a sample of GR–S has been measured, at temperatures ranging from 0° to 65 °C., in several solvents made progressively 'poorer' (to the point of precipitation) by the addition of nonsolvent. The results afford strong evidence in support of the theory (Flory; Alfrey, Bartovics, and Mark) that intrinsic viscosity is very sensitive to the shape assumed by a flexible long-chain molecule in solution and that this shape varies with the nature of the solvent and with the temperature. Measurements with various systems of the type GR–S–solvent–nonsolvent indicate that the intrinsic viscosity at the precipitation point is the same with different nonsolvents and, to a first approximation, with different solvents. This intrinsic viscosity is, moreover, independent of temperature.

ISSN:1923-4287    

DOI:10.1139/cjr48b-024

出版商:NRC Research Press    

年代:1948

数据来源: NRC