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Volume 22 (1968 - 196･･･
- Issue 6 Pages 365-
- Issue 5 Pages 337-
- Issue 4 Pages 298-
- Issue 3 Pages 243-
- Issue 2 Pages 163-
- Issue 1 Pages 6-
Volume 22, Issue 6
Displaying 1-5 of 5 articles from this issue
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Hiroshi MUROTANI, Hideki AOKI, Tadashi GOTO1969 Volume 22 Issue 6 Pages 365-368
Published: 1969
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSBasic magnesium carbonate, usually 4MgCO3·Mg(OH)2·4H2O, can be crystalized from the aqueous solution by various methods. There are some preceding states of this usual basic salt. In this study, these substances were separated from each other and divided into three types I, II and III in accordance with the characteristics of their X-ray diffraction patterns.
These three types of substances have the composition of 4MgCO3·Mg (OH)2·5H2O and orthorhombic structure. The values of lattice constant a0(and b0) in these types are not very different, but c0 can be calculated as 21.18 Å in type I, 41.10 Å in type II and 62.02 Å in type III, respectively.
Also, these densities are 2.05-2.14 (25°C) and refractive indexes 1.49-1.52 (20°C). The solubilities (25-75°C) are in order of type I<type II<type III. This order is just opposite to that (III→II→I) of the transformation among these types.
In the thermal decomposition process, type I shows three endothermic changes, type II two endothermic changes, and type III two endothermic changes and one exothermic change. Furthermore, the thermal decomposition of type III is resemble to that of the usual basic salt.View full abstractDownload PDF (9702K) -
Recovery of Potassium by the Metal Phosphate (Part 1)Hiroshi MATSUSHITA, Terumi TAKAGI1969 Volume 22 Issue 6 Pages 369-379
Published: 1969
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThe authors conducted a test on the feasibility of recoverring potassium from brine by using MgHPO4·3H2O. They first examined conditions under which MgHPO4·3H2O was formed, and they next examined the absorbing character and mechanism of potassium by using materials produced under various conditions.
1. Potassium was absorbed by the alkaline area and eluded from the acidic side. When it was absorbed, pH did not show any remarkable change even if alkali was added. This suggested that absorption of potassium might be caused by exchange reaction.
2. Although the rate of potassium absorption differed in accordance with the particle size of MgHPO4·3H2O, the complete equilibrium was obtained within about 30 minutes. As compared with this rate, the rate of dissolution of MgHPO4 was lower.
3. As the concentration of the added potassium solution increased, the amount of absorbed potassium increased. The amount of absorbed potassium was 0.5 and 0.9 meq/g when K+ concentration was 0.15 and 0.2 mole/l, respectively.
4. As compared with potassium, the amount of absorbed sodium was very small.
5. The solubility of MgHPO4·3H2O possessing an average particle size of 120μ, amounted to 24mg in 100g water at 20°C and to 14mg in brine (16°Bé) produced by ion exchange membrane method.View full abstractDownload PDF (25390K) -
Nobuharu TAKAI, Manabu SENO, Takeo YAMABE1969 Volume 22 Issue 6 Pages 379-382
Published: 1969
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSWe made a study on the electromigration of ion-exchange papers (filter papers impregnated with pulverized ion-exchange resins), and found that the effect of ion-exchange adsorption exerted some influence on the electromigration behavior of ions.
The ion-exchange papers used for this study were Amberlite SA- 2 and WA- 2 which were conditioned as usual. The apparatus to be used for paper electrophoresis was used, and the mobilities of Na+, K+, and Ca2+ ions were measured at constant voltage.
It is expected that the present method can be applied to the practical separation of ions and give some information for the mechanism of interaction between ion-exchange resins and these ions.
The result of ionic mobilities in ion-exchange papers agreed with that observed in ion-exchange membrane electrodialysis.View full abstractDownload PDF (6994K) -
Studies on Desalination of Sea-Water (1)Takatugu AZUMI, Reizo DOHNO, Tadao HAKUSHI, Shiro TAKASHIMA, Toshio IS ...1969 Volume 22 Issue 6 Pages 383-391
Published: 1969
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThrough a series of our experiments on the desalination of sea water by ion-exchange membrane method at a constant current density, we found it possible to obtain desalinated water of considerably low concentration.
Our experiments showed that Na+, Mg2+, and Ca2+ were eliminated at an almost similar ratio, but the permselectivities of Mg2+ and Ca2+ against Na+ increased as the current density decreased.
On the other hand, the elimination of SO42- was remarkably lower than that of Cl-, and the molar fraction of SO42- in desalinated water increased with the progress of desalination. The permselectivity coefficient of SO42- against Cl- increased as the concentration of Cl- decreased, but the influence of current density of this coefficient was very small.View full abstractDownload PDF (16529K) -
Nobuharu TAKAI, Toshimichi NAKAMURA, Takeo YAMABE1969 Volume 22 Issue 6 Pages 392-394
Published: 1969
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSBy using a liquid ion-exchange membrane consisting of tri-n-octylammomium salt (Farmin T-08, Kao Soap Co.), some measurement are taken on the concentration potentials across the membrane which separates two solutions with different concentrations of a simple electrolyte KCl, or Na2SO4.
It is found that the transport number of chloride ions and sulfate ions in the liquid membrane are 0.8-0.95 and 0.6-0.8, respectively, and the behavior is in a good agreement with that in the usual ion-exchange membrane.View full abstractDownload PDF (4675K)
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