The height of the foam zone, the duration and the stability of foam of the ternary system, ethyl alcohol-glycerol-water have been measured. As the result three maximum points A, B and C in the diagrams of these properties are found. The maximum B in the region of low concentration of ethyl alcohol is due to the decrease of surface tension. The maximum C, which is found in the bubble stability diagram while absent in foaminess and foam duration diagrams, may be ascribed to the high viscosity of the system. The same effect is found also in the case of the aqueous solution of sulphuric acid. The maximum A is supposed to be parallel to volume contraction on admixture.
(1) The BET adsorption isotherm was derived by statistical mechanics, using the saddle point method. (2) The constants in BET isotherm can be represented by the internal partiton functions of the adsorbed phase.
The author has succeeded to extract germanium and gallium of satisfactory quality almost quantitatively in small scale. Germanium oxide can be refined by redistillation and hydrolysis, and the product is applicable as the standard substance for the chemical study. It is confirmed that Rothe’s extraction is a suitable method for the preparation of gallium from germanite.
(1) The rare earths, free from thorium, could be separated as the earths sulphate double compound (yield 93%). (2) The method of separating thorium from the filtrate, which was obtained by separating about 63% of rare earths salt from the extracted solution, gives better result than a method of direct fractional precipitation from the extracted solution. (3) Cerium can be separated from a solution as rare earths ammonium double compound with a purity of 92–96% (yield 70–75%). (4) In the separation of cerium, a maximum point of purity is obtained when sufficient quantity of ammonia is added just to remove the colour of Ce ion from the solution. The purity and yield of cerium is not strictly in an inverse proportion, but a point of maximum purity of precipitate is obtained when a certain definite amount of ammonia is added.
The equilibrium relationships of the radioactive elements in the hydrosphere was studied. The radium, radon, radium A, radium B, radium C, radium F (polonium), thorium X, thoron, and thorium B content of mineral springs of Masutomi was estimated, and discussed from geochemical point of view. It was found that spring B7 shows the high content of thorium X and thoron. Spring A49, on the other hand, showed the high content of radon and polonium. It was also found that the decay products of radon are contained in fresh mineral springs in considerably lower amounts compared with those expected from the radon contents. The authors take this opportunity of heartily thanking Prof. Ken-jiro Kimura for his kind guidance in the course of this study. The cost of this research was defrayed from the Scientific Research Encouragement Grant from the Department of Education, to which our thanks are due.
1. Furfural was hydrogenated into furfuryl alcohol by using copper chromium oxide catalyst under high pressure. Then the product was further hydrogenated by adding nickel kieselguhr catalyst, without separation and purification of furfuryl alcohol. The hydrogenation proceeded rapidly and furfaryl alcohol about 83–84% of the theoretical yield was obtained. 2. Furfural was hydrgenated by using copper chromium oxide catalyst and nickel kieselguhr catalyst, which were prepared separately before use. The hydrogenation proceeded rapidly, and furfaryl alcohol, (about 74∼79% of the theoretical yield) was obtained, which is slightly lower than in the above procedure. 3. The mixture of Cu(OH)(NH4)(CrO4) and nickelcarbonate kieselguhr, mixed mechanically or in the state of precipitates, was used for the hydrogenation of furfural, after reducing it with hydrogen or after thermal decomposition without reduction. The results was less satisfactory compared with the above two procedures.
(1) The competitive inhibitation of benzedrine and similar compounds upon amine oxidase was manometricalJy studied. (2) The relation between the inhibiting action and the constitution of these amines was discussed.