Bulletin of the Society of Sea Water Science, Japan

[title in Japanese]

[in Japanese]

1976 Volume 30 Issue 2 Pages 67-81
Published: 1976
Released on J-STAGE: February 19, 2013

DOIhttps://doi.org/10.11457/swsj1965.30.67

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The Study of the Relation between Concentration of Surface Active Agent and Critical pH in the Soluble Salt Flotation Method

Studies of Soluble Salt Flotation (Part 1)

Takeshi OKAWARA, Minoru KADOTA, Shumpei OKA

1976 Volume 30 Issue 2 Pages 82-86
Published: 1976
Released on J-STAGE: February 19, 2013

DOIhttps://doi.org/10.11457/swsj1965.30.82

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The Flotation Method is known to be an important and interesting industrial process in the separation, recovery and refining of the mixture of several salts, and it should be more widely utilized. The above study was carried out by us as a fundamental experiment in order to explain the mechanism of“flotation”-the effect of pH in soluble salt flotation by observing the hydrophobic extent of soluble salt crystals-using a few surface active agents at soluble potassic salts. The results thus obtained were as follows:
1) Potassic salts belong to the alkaline side in the case of the anionic surface active agents. But they are acidic and are apt to be hydrophobic easily in the case of“the cationic surface active agent.”
2) Potassic salts can be separated and recovered in the side which is more than pH 5 in the case of anionic surface. active agents of Na-lauryl sulfate or Na-dodecylbenzenesulfonate. But they are also apt to be separated and recovered in the side which is below pH 7 in the case of cationic surface active agents of laurylamine acetate or octadecylamine acetate.
3) Our selective separation of the salt from the mixture of several salts in the flotation method was possible only under a certain condition.
In conclusion, it.was proved by us in this case that the relation between the concentration of the surface active agent and critical pH in soluble salt flotation was an important factor.

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On Data Acquisition System for Test Plant of Multi-Stage Flash Evaporator

Masahito SATO, Tsutomu SUGETA, Shigeki TOYAMA, Takeshi TOHOYAMA

1976 Volume 30 Issue 2 Pages 87-98
Published: 1976
Released on J-STAGE: February 19, 2013

DOIhttps://doi.org/10.11457/swsj1965.30.87

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A national project entitled “SEA WATER DESALTING AND BY-PRODUCT RECOVERY” started in 1969, and a test plant of multi-stage flash evaporators having a capacity of 3,000m³/D was constructed in 1970 and was operated from 1971 to 1973. This paper concerns the data acquisition system which was designed and equipped with a view to operating the test plant for the purpose of obtaining information rather than producing desalted water.
The system was composed of the computer with 8 kilo-word memory, a couple of magnetic tape recorders, an I/O controller and digital measurement instruments.
The system was able to deal with about 200 signals from the plant such as temperature (147 points), pressure (2 points), concentration (9 points), flow rate (16 points), level (16 points) and pH (5 points). The signals were led to the AD converter via the amplifier in accordance with the programmed code for scanning. When the scanning was completed, all the data were tagged and transmitted to the magnetic tape, and some of them were computed and printed out.
For the measurement of temperature, the accuracy at the order of 0.05°C was attained by improving the bridge balancer.
The system was improved to attain the function of running without employing an operator by surmounting the noise and irregular signals, and recorded enormous data in magnetic tapes during the 3 years' operation. The data printed out gave such a sufficient amount of information about the test plant operation that another analysis was scarcely needed to be conducted.

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Development of a New Reverse Osmosis Module

Shoji KIMURA, Tsuyoshi NOMURA, Motoichi IKEDA

1976 Volume 30 Issue 2 Pages 99-106
Published: 1976
Released on J-STAGE: February 19, 2013

DOIhttps://doi.org/10.11457/swsj1965.30.99

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The development of a new type of the reverse osmosis module is described in this paper. The module consists of bundle of 3 mm diameter flexible tubes, which are made of nylon fibers and covered by nylon net and coated with cellulose acetate membranes. These tubes can be easily made and has resistance to the pressure of upto 100 atm., which is sufficient for a one pass sea water desalination. The module is not sensitive to feed water turbidity can be opened, cleaned and repaired, and still has a compactness comparable to the spiral module.
First, the relation between heat treatment temperatures and permeabilities of water and solute was determined for each tube. Then, small modules of 13 tubes of 80 cm length were made and tested under various conditions. Finally, a larger module of 41 tubes was developed and tested. These modules showed excellent results, though some more improvements were necessary on the end seal, which tended to break at high pressure.

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Quantity Control for the Measurement Law

Masami KAHO, Tetsuo SUMIDA

1976 Volume 30 Issue 2 Pages 107-110
Published: 1976
Released on J-STAGE: February 19, 2013

DOIhttps://doi.org/10.11457/swsj1965.30.107

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