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Volume 31 (1977 - 197･･･
- Issue 6 Pages 271-
- Issue 5 Pages 213-
- Issue 4 Pages 155-
- Issue 3 Pages 97-
- Issue 2 Pages 52-
- Issue 1 Pages 1-
Volume 31, Issue 3
Displaying 1-6 of 6 articles from this issue
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[in Japanese]1977 Volume 31 Issue 3 Pages 97-109
Published: 1977
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSDownload PDF (8503K) -
Especially on Temperature MeasurementFumikazu IKAZAKI, Masahito SATO, Tsutomu SUGETA, Shigeki TOYAMA, Takes ...1977 Volume 31 Issue 3 Pages 110-122
Published: 1977
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSA test module plant of multistage flash (MSF) evaporator to desalt sea water was constructed in Oita for the purpose to obtain sufficient data in designing a 100,000m3/day plant. The research and development had been conducted as an activity in the 2nd phase of the national project on the “SEA WATER DESALTING AND BY-PRODUCT RECOVERY” which was completed in March, 1977. The test module plant was operated not to produce water, but to acquire precise data. From this standpoint, the data acquisition system played a significant part in the project. In advance, we had already experienced the process to deal with an acquisition system in the 3,000m3/day MSF evaporator which had been tested for three years until 1973 in the 1st phase of the project, and found two problems to be practiced. One is the highly precise temperature measurement of flashing brine throughout a long-term operation and the other is the computer system capable of dealing with multijobs.
This paper describes the following valuable experiences with the system.
(1) The absolute precision of temperature measurement was better than about 10 ppm as far as independently regarding to the A/D-converter by calibrating with a standard resistance.
(2) Calibration of each platinum resistance for temperature measurement within an absolute precision of 0.01°C resulted in accomplishing temperature measurement at an absolute precision of better than 0.1°C even after two years.
(3) The secular change of resistance in platinum sensor brought about the greatest effect on the absolute precision of temperature measurement.
(4) The precisely measured temperature distribution in flashing brine provided an advanced idea for determining chamber geometry of the evaporator.View full abstractDownload PDF (9987K) -
Studies on the Treatment Giving Low Permeability for Bivalent Ions in Electrodialytic Concentration Using Ion Exchange MembraneYoshinobu TANAKA1977 Volume 31 Issue 3 Pages 123-127
Published: 1977
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESS(1) The mixed aqueous solution of sodium chloride, calcium chloride and small amount of reagent (hexa dimethrine bromide) was fed to small electrodialytic cell, and cation exchange membranes were treated under electric field to get low permeability for bivalent ions. Consequently, permselectivity coefficient TCaNa decreased remarkably.
(2) Voltage between electrodes increased by the treatment. The increase depends primarily on the decrease in the ionic concentration at the boundary between cation exchange membrane and reagent layer formed on the surface of the membrane, and secondarily on the increase in electric resistance of the reagent layer.
(3) By the treatment, pH of desalted solution changed to alkaline and of concentrated solution changed to acidic respectively. The pH changes was due to the dissociation of water arising at the boundary between the reagent layer and cation exchange membrane.
(4) The electric resistance of treated cation exchange membrane measured in mixed aqueous solution of sodium chloride and calcium chloride was large. This phenomenon was due to the increase in electric resistance of reagent layer, because the reagent layer indicates low permeability for calcium ions. The electric resistance of the treated cation exchange membrane measured in aqueous sodium chloride did not increase remarkably, so, the electric resistance of reagent layer was considered to show few increase in aqueous sodium chloride.View full abstractDownload PDF (3270K) -
Studies on the Extraction of Uranium from Sea Water by the Composite Adsorbent (Part 6)Shunsaku KATOH, Kazuhiko SUGASAKA, Ayako FUJII, Norio TAKAGI1977 Volume 31 Issue 3 Pages 128-130
Published: 1977
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSWe have been studing the extraction method of uranium from sea water by aluminium hydroxide and by the aluminium-activated carbon composite adsorbent.
The present study was undertaken to determine of heating effect on the uranium adsorptivity of the aluminium hydroxide and of the aluminium-activated carbon composite adsorbent.
Aluminium hydroxide, which was prepared by hydrolysis of aluminium chloride, showed high adsorptive capacity for uranium by heating at 250°C, but showed decrease of the capacity by heating at higher temperature than 250°C, and lost the capacity at higher themperature than 400°C.
In the case of the composite adsorbent, the unheated adsorbent showed the highest adsorptive capacity, and the adsorbent lost the capacity by heating at higher temperature than 250°C. The adsorptive capacity of the heated adsorbents at higher than 250°C for uranium were closely proportional to the alkaline consumption.View full abstractDownload PDF (1915K) -
Part 3 Electrodialysis, Reverse Osmosis and Ion-Exchange Processes for Water DesalinationOsamu MIYATAKE1977 Volume 31 Issue 3 Pages 131-139
Published: 1977
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSDownload PDF (6308K) -
1977 Volume 31 Issue 3 Pages 140-150
Published: 1977
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSDownload PDF (7789K)
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