Bulletin of the Society of Sea Water Science, Japan
Online ISSN : 2185-9213
Print ISSN : 0369-4550
ISSN-L : 0369-4550
Recovery of Hydrating Agent by Carrier Gas Method
Concentration of Sea water and Brine by the Gas-Hydrate Process (Part 14)
Susumu SAITOMasaharu IIJIMA
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1969 Volume 23 Issue 2 Pages 46-53

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Abstract

After investigations were done under several conditions, a recovery cycle of hydrating agent (dichloromonofluoromethane, R-21) was established. In this cycle, R-21 was desorbed from the solution produced by gas hydrate process, and it was absorbed into raw sea water, by means of carrier gas and packed towers.
Results obtained were as follows:
1) A test plant (packed volume in each tower was 0.0327m3) could be operated for a long time without any trouble and showed very stable results.
2) When 0.8-1.5m3/hr of carrier gas was applied in the both desorbing and absorbing towers, 0.2-0.4m3/hr of liquid could be charged.
Channelling occured in the both towers at liquid flow rate of 0.1m3/hr, and flooding in the desorbing tower at 0.5m3/hr.
3) On the desorption, the optimum conditions for operating the tower were such as liquid flow rate was 0.2m3/hr, gas-liquid molar flow ratio was about 200 and in higher operating temperature (20-25°C). Under these conditions, desorbing ratio for R-21 was about 99%.
4) On the absorption, the tower could be most effectively operated at the liquid flow rate of 0.2-0.4m3/hr, but gas-liquid molar flow ratio which influenced the absorbing ratio was not defined.
Under these conditions, absorbing ratio for R-21 was more than 99% at an average value.
5) The operating temperature of the tower during the desorption was so influential that it exerted an influence even upon the adsorption.
6) Theoretical tower heights for desorpton and absorption were calculated under various conditions by over-all volumetric mass transfer coefficient, which were lower than 10m.

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