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실관막에 의한 Cd(Ⅱ) 및 Cu(Ⅱ)의 액-액 추출에 관한 연구
황덕기,박동원 동아대학교 환경문제연구소 1993 硏究報告 Vol.16 No.2
The extraction of Cd(Ⅱ) and Cu(Ⅱ) in mixed aqueous solution was studied with TOA(tri-n-octylamine) dissolved in aromatic organic solvents using HFSLM(hollow fiver supported liquid membrane). HFSLM module with constant volume was used to measure mass transfer coefficients of the extraction with mixed aqueous solution under acidic condition at 25℃, and overall mass transfer coefficients were increased with increasing initial concentration of HCI in mixed aqueous solution, with increasing velocity of inner fibers.
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황덕기,김영일,박동원 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.1
Liquid-Liquid separation of Cu(Ⅱ) by SLM with hallow fiber module is one of the most effective method for removal, separation of heavy metals in aqueous solution and waste water. Liquid-Liquid separation by SLM using tri-octyl amine(TOA) was studied in order to investigate the optimum separation condition of CU(Ⅱ) and overall coefficient of mass transfer. The experimental result was that separation of CU(Ⅱ) in aqueous solution accomplished very well and overall coefficient of mass transfer was accordance experimental values with theoretical values.
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Hollow fibers에 의한 Cr(VI)분리에 관한 연구
박동원,황덕기 東亞大學校 大學院 1990 大學院論文集 Vol.15 No.-
Liquid-Liquid separation Technique by microporous hollow fiber module is one the most effective method for removal, sepaation of heavy metals in aqueous solution and waste water. Liquid-Liquid separation by microporous hollow fiber module using tri-octyl amine(TOA) was studied in order to investigate the optimum separation condition of Cr (Ⅵ) , overall coefficient of mass transfer. This experiments were carried out in variors operation condition. The experimental results wers as follows. 1. Liquid-Liquid separation of Cr (Ⅵ) by microporous hollow fiber module using TOA was optimum condition in pH2 and identified that was not separated above pH7. 2. The separation of Cr (Ⅵ) solution in lower cencentration was exellent, because residual concentration of Cr (Ⅵ) was 0.8ppm, when used Cr (Ⅵ) solution of 10ppm. 3. The separation rate was optimum condition in 20 ㎤/hr. 4. The resistance of outside the fibers dominated overall transfer resistance in separation of Cr (Ⅵ) by microporous hollow fiber module. 5. The values of overall mass transter coefficient was shown in Table 1.
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황덕기,박동원 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.2
Liquid-Liquid separation of Cd(Ⅱ) by SLM with hallow fiber module is one of the most effective method for removal, separation of heavy metals in aqueous solution and waste water. Liquid-Liquid separation by SLM using tri-octyl amine(TOA) was studied in order to investigate the optimum of Cd(Ⅱ) and overall coefficient of mass transfer. The experimental result was that separation of Cd(Ⅱ) in aqueous solution accomplished very well and overall coefficient of mass transfer was accordance experimental values with theoretic values.
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李龍珍,金萬壽,朴東源,金英一,黃德基 東亞大學校 大學院 1997 大學院論文集 Vol.22 No.-
Liquid-liquid extractions by use of microporous hollow fiber modules are fast compared with conventional extraction equipment because of the large surface area per volume. In these modules, the extractant and feed can be contacted at high speed andtwo flows are completely independent, so there are no problems with loading and channeling. In this paper, it was investigated the extractability for liquid-liquid extraction of Cu(Ⅱ) from dilute aqueous solution into D2EHPA(di-2-ethylhexylphosphoric acid), TBP(tri-n-butyphosphate) and TOA(tri-n-octylamine) as organic extractants by using the hydrophobic hollow fiber module. To determine the dependence of mass transfer rate on distribution of Cu(Ⅱ) in the module, we compared the overall mass transfer coefficient with distribution ratio. From these experiments, we identified the effect of distribution ratio on the overall mass transfer coefficient was, for the low H, the K? was increased with increasing H, but high value of H, the effect of H on K? could be negligible.
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황덕기,주창식,정용옥,이회근,천재기 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.4
Hexamethylenetetramine(HMTA) 존재 하에서 질산아연 수용액으로부터 균일침전법으로 산화아연 미세입자를 제조하였다. 전화율 증가속도와 평형 전화율은 R 값과 반응온도가 증가할수록, 용액의 초기 pH가 감소할수록 증가했으나, 아연의 초기 농도에는 거의 영향을 받지 않았다. 질산아연과 HMTA의 농도, 반응온도, 반응액의 초기 pH 그리고 반응시간과 같은 침전조건에 따라 여러 형태의 산화아연 입자들이 얻어졌다. 초기의 미세 결정입자는 평균 직경이 대략 1 ㎛ 전후이고 구형에 가깝지만, 성장하면서 서로 결합하여 embryonic particle을 형성한 후 성장해 갔다. 아연의 초기농도와 R값이 모두 높을 때 비교적 입도분포가 좁은 구형 입자들이 생성되었다. Zinc oxide fine particles were prepared from aqueous solutions of zinc nitrate in the presence of hexamethylenetetramine by homogeneous precipitation method. The rate of conversion change and the equilibrium conversion of zinc increased with the increase in R values and temperature, and with the decrease in initial pH of the solutions but initial concentration of zinc had only minor effect on them. Various shapes of zinc oxide fine particles were formed in relation to the precipitation conditions such as, concentrations of zinc nitrate and hexamethylenetetramine, temperature, pH of initial solution and aging time. The initial microcrystalline particles are approximately spherical with an average size of 1 ㎛, but they formed embryonic particles by coupling together and grew up. Spherical particles with a relatively narrow size distribution could be obtained when the concentration of zinc ion and R value were both high.
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