An empirical formula between vaporating and weather energy on “Shijoka”-type concentrating equipment was obtained.
fE/T=0.364 ·S·C·U^0·69
where E/T; vaporating velocity,(kg/hr)
f; factor of vaporating resistance.
S; section area of “shijoka”-type concentrating equipment (m²)
C; saturation deficit of the air,(g/m³)
U; mean wind velocity,(km/hr)
According to vaporating velocity, critical vaporating velocity on the economical working of “Shijoka” was calculated from producting cost and receipts, and relation between weather elements and critical vaporating velocity was figured.

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In order to research the limit of area ratio of the Shijoka to the flow-down type salt field, we measured the distribution of the humidity and the wind velocity, because of the tendency of setting more shijoka.
(1) Beyond the Shijoka, the humidity and the wind velocity recovered generally 65-90%, of course, the numerals changed with the velocity.
(2) It is better that Shijoka is set perpendicularly to the direction of the wind, mostly through a year and zigzag.
(3) From the technical and economical points of views, the area limit of Shijoka to salt field is about 15%.

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Activated magnesium silicates are used widely as an adsorbent and a catalist. In this study it is investigated to make magnesium silicate highly active. The results obtained are as follows;
(1) Adsorption power of magnesium silicates (x MgO·y SiO₂·z H₂O) depend on their composition and the method of making them.
(2) The vapour of organic solvents such as benzol, aceton and ether, is extremely adsorbed by the compounds of mol-ratio MgO:SiO₂=1:40-1:20, which is usually obtained from sodium silicate and magnesium salt solution.
(3) Generally the compound of mol-ratio MgO:SiO₂=2:3, adsorbes methylen blue. But it becomes more active if it is produced in a new two-steps process; at first, more basic compound is made from sodium silicate and magnesium salt solution, and secondly it is decomposed with acid solution into the desired composition of MgO:SiO₂=2:3.

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In previous paper was described the industuial utilization of the waste calcium carbide-method. In the present papes. We described about a reaction of CaC₂ and bittern to give C₂H₂ gas and Mg (OH)₂ according to the following reaction.
CaC₂+MgCl₂+2H₂O→C₂H₂+Mg(OH) ₂+CaCl₂
Investigating emiting velosity of C₂H₂ gas and easiness of filtration, impurities in yield of produced Mg(OH)₂. We examined various industrial condition of the reaction such as temperature and concentration.

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In order to find the more effective method for synthesis of potassium selective resin “polyhexyl”, having researched several methods, started from benzaldehyde, acetophenon and polystyrene etc. respectively, we have found that, as material, polystyrene was the most profitable, and decided to synthesize “polyhexyl” from it. In these papers, we inform the nitration of polystyrene as part 1. At first, we found that the polymerisation degree of polystyrene used was about 10⁴, and then the best method that produced p-mononitropolystyrene was nitration by nitric acid fuming not heated.

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The accuracy of H₂O content determination was discussed. The d-V-t relation was founed to be 1.191 log V-0.360 log d+0.392=log t±0.01
where d=the distance between infrared lamp and sample (cm), V=voltage (volt), t=reading of thermometer on the pan (°C). The heating-loss curve of salts was obtained at the increasing rate of 1 volt per minute. The method for shortening the required time was tried.

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[in Japanese]

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