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최대웅 東義大學校産業技術開發硏究所 2008 産業技術硏究誌 Vol.22 No.-
The continuous extraction of cadmium ion from aqueous solution in a hollow fiber module was conducted using extractants of D2EHPA, Lix84, TOA and TBP, and the variation of extraction efficiency from mixed ion solution and mixed extractants was experimentally investigated. Comparison of the experimental outcome with a conventional solvent extraction and menbrane extraction leads to the following results. The continuous extraction improves the extraction efficiency and reduces solvent consumption and processing time. The mixed extractant systems is no significant effect. The menbrane extraction is more convenient than the conventional solvent extraction process, but the extraction efficiency is close. Other heavy metal ions do not affect the extraction of cadmium in quaternary mixed solution.
최대웅,신군섭,박동원,이성식 한국공업화학회 1998 한국공업화학회 연구논문 초록집 Vol.1994 No.1
Extraction by hollow fibers are fast compared with conventional extractional equipment because of the large surface area per volume, and the feeds can be contacted at high speed and two flows are completely independent, so there no problems withlaoding, flooding and channeling. In this paper, it was investigated the flow rate of aqueous and organic solution by using the hollow fiber membrane. It is known that the mass transfer is done as the flow rate of aqueous phase increase. For the system with high distribution ratio, effect of the distribution ratio on mass transfer was weak in system in the hollow fiber membrane.
최대웅 東義大學校産業技術開發硏究所 1994 産業技術硏究誌 Vol.8 No.-
Thermal gravimetric desorption of n-hexane, n-octane, and n-decane on zeolite A, X, and L in a nitrogen stream at single heating rate was studied. The activiaton energy of desorption (??) and entropy (??) were evaluted from the method proposed by L.V.C.Rees. ?? increased with decreasing the coverage of hydrocarbon, and was dependent on the aperture of main channel, cage volume of zeolite, and the size of adsorbate molecule. Εd was considerably larger than isosteric heat obtained from adsorption isotherms, which suggests that in case of large molcecule ?? obtained by temperature programmed desorption contained contributions from the activation energy of diffusion of the desorbed molecules.