침상형 α-Goethite를 분산시킨 현탁기포탑에서의 기포경과 물질전달계수(II)

고재천; 김범식; 김철웅; 이정민; 이보성

HWAHAK KONGHAK, Vol.30, No.1, 106-115, February, 1992

Export Citation

침상형 α-Goethite를 분산시킨 현탁기포탑에서의 기포경과 물질전달계수(II)

Bubble Size and Mass Transfer Coefficient in Acicular α-Goethite Suspension in a Slurry Bubble Column[II]

고재천, 김범식, 김철웅, 이정민, 이보성

초록

1N-NaOH 수용액에 미세한 침상형 α-Goethite(평균길이 0.27㎛)가 현탁된 기포탑에서 물질전달 현상에 대하여 연구하였다. 기포경을 측정하기 위하여 2-point probe를 사용하였다. 측정된 기포경은 log-normal분포를 나타냈으며 공탑속도와 현탁농도의 증가에 따라 기포경의 분포는 unimodal 에서 multimodal로 변화되었다. 계산된 Sauter 평균 기포경(d_vs,volume-to-surface mean bubble diameter)은 공탑속도와 현탁농도의 증가에 따라 최소치를 보인후 증가하는 경향을 보였다. 물질전달계수(k_L)는 0.9wt% 미만에서 증가현상을 보였으며 0.9wt%이상일 경우 고체농도의 증가에 따라 급격히 감소하였고, 또한 Sauter 평균 기포경(d_vs)이 커짐에 따라 증가현상을 보였다. 본 현탁기포탑에서의 물질전달계수는 아래와 같이 무차원군과 고체농도비(wt%)의 항으로 잘 나타낼 수 있었다.
Sh=1.0×10^-5Sc^1.53Re^0.79Bo^0.51/(1+8.×Φ^2..73)

Mass transfer phenomena were studied in a slurry bubble column in which fine acicular α-Goe-thite partiicles(average length 0.27㎛) were suspended in 1N-NaOH solution. In order to measure bubble diameter, two-point probe was used. Distribution of measured bubble diameters in the slurry bubble column was showed log-normal and changed from unimodal to multimodal with increasing the superfiicial gas velocity and solid concentration. Sauter mean bubble diameter(d_vs, volume-to-surface mean bubble diameter)was minimized at transition region, but above that region, it was increased by increasing superficial gas velocity and solid concentrations. Liquid side mass transfer coefficient(k_L) was increased below 0.9wt% solid concen-tration but was suddenly decreased above 0.9wt% by concentrationg the solid. The k_L was also increased with increasing the Sauter mean bubble diameter. Liquid side mass transfer confficient can be represented as following equation by dimensionless groups and wt% concentration on this system and conditions.
Sh=1.0×10^-5Sc^1.53Re^0.79Bo^0.51/(1+8.×Φ^2.73)

[References]

Valentin FHH, "Absorption in Gas-Liquid Dispersions," Spoon, F.N., Ltd. London (1967)
Joosten GEH, Schilder JGM, Janssen JJ, Chem. Eng. Sci., 32, 563 (1977)
Koh J, Kim B, Lee J, Rhee BS, HWAHAK KONGHAK, 27(1), 23 (1989)
Sada E, Kumazawa H, Lee CH, Chem. Eng. Sci., 38, 12 (1983)
Ledakowicz S, Kokuun R, Brehm A, Deckwer WD, Chem. Eng. Technol., 55, 8 (1983)
Quicker G, Schumpe A, Deckwer WD, Chem. Eng. Sci., 39, 1 (1984)
Deckwer WD, Nguyen-Tien K, Schumpe A, Serpemen Y, Biotechnol. Bioeng., 24, 461 (1982)
Nakao K, Tacheuchi H, Kataoka H, Kaji H, Otake T, Miyauchi T, Ind. Eng. Chem. Process Des. Dev., 22, 577 (1983)
Schugerl K, Lucke J, Oels U, Adv. Biochem. Eng., 7, 1 (1977)
Schugerl K, Lucke J, Lehmann J, Wagner F, Adv. Biochem. Eng., 8, 63 (1978)
Schugerl K, Adv. Biochem. Eng., 19, 71 (1981)
Schugerl K, Adv. Biochem. Eng., 22, 93 (1982)
Moo-Young M, Kawase Y, Can. J. Chem. Eng., 65 (1987)
Kiyama M, Bull. Chem. Soc. Jpn., 47, 1646 (1974)
Koh J, Lee J, Rhee B, HWAHAK KONGHAK, 25(5), 435 (1987)
이정민, 이철호, 이학성, 고재천, 류병환, "알칼리 수용액 중에서 이가철의 공기산화에 관한 연구," 과학기술처, 기본연구과제 (1986)
Calderbank PH, Chem. Eng., Oct., 209 (1967)
Burckhart R, Deckwer WD, Chem. Eng. Sci., 30, 351 (1975)
Akita K, Yoshida F, Ind. Eng. Chem. Process Des. Dev., 13(1), 84 (1974)
Kim SD, Baker CGJ, Bergougnou MA, Chem. Eng. Sci., 32, 1299 (1977)
Schumpe A, Deckwer WD, Chem. Eng. Sci., 35, 2221 (1980)
Buchholz H, Buchholz R, Lucke J, Schuger K, Chem. Eng. Sci., 33, 1061 (1978)
Mihail R, Straja S, Chem. Eng., 33, 71 (1986)
Kawagoe K, Nakao K, Otake T, J. Chem. Eng. Jpn., 8(3), 254 (1975)
Poggemann R, Steiff A, Weinspach PM, Ger. Chem. Eng., 6, 236 (1983)
Deckwer WD, Schumpe A, Chem. Ing. Tech., 55(8), 591 (1983)
Albal RS, Shah YT, Schumpe A, Carr NL, Chem. Eng. J., 27, 61 (1983)
Chandrasekaran K, Sharma MM, Chem. Eng. Sci., 32, 669 (1977)
Calderbank PH, Moo-Young MB, Chem. Eng. Sci., 16, 39 (1961)
Locket MJ, Kirkpatrick RD, Trans. Instrn. Chem. Eng., 53, 276 (1975)
Fukuma M, Muroyama K, Yasunishi A, J. Chem. Eng. Jpn., 20(3), 321 (1987)
Nishikawa M, Kato H, Hishimoto K, Ind. Eng. Chem. Process Des. Dev., 16(1), 133 (1977)

[Referenced By]

[1] Valentin FHH, "Absorption in Gas-Liquid Dispersions," Spoon, F.N., Ltd. London (1967)

[2] Joosten GEH, Schilder JGM, Janssen JJ, Chem. Eng. Sci., 32, 563 (1977)

[3] Koh J, Kim B, Lee J, Rhee BS, HWAHAK KONGHAK, 27(1), 23 (1989)

[4] Sada E, Kumazawa H, Lee CH, Chem. Eng. Sci., 38, 12 (1983)

[5] Ledakowicz S, Kokuun R, Brehm A, Deckwer WD, Chem. Eng. Technol., 55, 8 (1983)

[6] Quicker G, Schumpe A, Deckwer WD, Chem. Eng. Sci., 39, 1 (1984)

[7] Deckwer WD, Nguyen-Tien K, Schumpe A, Serpemen Y, Biotechnol. Bioeng., 24, 461 (1982)

[8] Nakao K, Tacheuchi H, Kataoka H, Kaji H, Otake T, Miyauchi T, Ind. Eng. Chem. Process Des. Dev., 22, 577 (1983)

[9] Schugerl K, Lucke J, Oels U, Adv. Biochem. Eng., 7, 1 (1977)

[10] Schugerl K, Lucke J, Lehmann J, Wagner F, Adv. Biochem. Eng., 8, 63 (1978)

[11] Schugerl K, Adv. Biochem. Eng., 19, 71 (1981)

[12] Schugerl K, Adv. Biochem. Eng., 22, 93 (1982)

[13] Moo-Young M, Kawase Y, Can. J. Chem. Eng., 65 (1987)

[14] Kiyama M, Bull. Chem. Soc. Jpn., 47, 1646 (1974)

[15] Koh J, Lee J, Rhee B, HWAHAK KONGHAK, 25(5), 435 (1987)

[16] 이정민, 이철호, 이학성, 고재천, 류병환, "알칼리 수용액 중에서 이가철의 공기산화에 관한 연구," 과학기술처, 기본연구과제 (1986)

[17] Calderbank PH, Chem. Eng., Oct., 209 (1967)

[18] Burckhart R, Deckwer WD, Chem. Eng. Sci., 30, 351 (1975)

[19] Akita K, Yoshida F, Ind. Eng. Chem. Process Des. Dev., 13(1), 84 (1974)

[20] Kim SD, Baker CGJ, Bergougnou MA, Chem. Eng. Sci., 32, 1299 (1977)

[21] Schumpe A, Deckwer WD, Chem. Eng. Sci., 35, 2221 (1980)

[22] Buchholz H, Buchholz R, Lucke J, Schuger K, Chem. Eng. Sci., 33, 1061 (1978)

[23] Mihail R, Straja S, Chem. Eng., 33, 71 (1986)

[24] Kawagoe K, Nakao K, Otake T, J. Chem. Eng. Jpn., 8(3), 254 (1975)

[25] Poggemann R, Steiff A, Weinspach PM, Ger. Chem. Eng., 6, 236 (1983)

[26] Deckwer WD, Schumpe A, Chem. Ing. Tech., 55(8), 591 (1983)

[27] Albal RS, Shah YT, Schumpe A, Carr NL, Chem. Eng. J., 27, 61 (1983)

[28] Chandrasekaran K, Sharma MM, Chem. Eng. Sci., 32, 669 (1977)

[29] Calderbank PH, Moo-Young MB, Chem. Eng. Sci., 16, 39 (1961)

[30] Locket MJ, Kirkpatrick RD, Trans. Instrn. Chem. Eng., 53, 276 (1975)

[31] Fukuma M, Muroyama K, Yasunishi A, J. Chem. Eng. Jpn., 20(3), 321 (1987)

[32] Nishikawa M, Kato H, Hishimoto K, Ind. Eng. Chem. Process Des. Dev., 16(1), 133 (1977)