• Title/Summary/Keyword: Bubble Column

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Mass Transfer Characteristics in Pressurized Three-phase Slurry Bubble Columns with Variation of Column Diameter (가압 삼상슬러리 기포탑에서 직경변화에 따른 기체-액체 물질전달 특성)

  • Seo, Myung Jae;Lim, Dae Ho;Shin, Ik Sang;Son, Sung Mo;Kang, Yong
    • Korean Chemical Engineering Research
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    • v.47 no.4
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    • pp.459-464
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    • 2009
  • Gas-liquid mass transfer characteristics were investigated in pressurized three-phase slurry bubble columns with variation of column diameter. Effects of gas velocity, operating pressure, liquid viscosity, solid content in the slurry phase and column diameter on the gas-liquid volumetric mass transfer coefficient($k_La$) were determined. The effects of operating variables on the mass transfer coefficient tended to change with variation of column diameter. The mass transfer coefficient increased with increasing gas velocity or operating pressure but decreased with increasing column diameter, liquid viscosity or solid concentration in the slurry phase. The increase trend of $k_La$ value with increasing gas velocity and the decrease trend of $k_La$ value with increasing liquid viscosity, tended to decrease gradually with increasing column diameter. However, the effects of operating pressure and solid concentration in the slurry phase on the $k_La$ value did not change considerably with variation of column diameter. The values of $k_La$ were well correlated with operating variables with in this experimental conditions as $k_La=0.02D^{-0.26}U_G^{0.28}P^{0.43}{\mu}_L^{-0.04}S_c^{-0.35}$.

Production of 1,3-Dihydroxyacetone from Glycerol by Gluconobacter oxydans ZJB09112

  • Hu, Zhong-Ce;Liu, Zhi-Qiang;Zheng, Yu-Guo;Shen, Yin-Chu
    • Journal of Microbiology and Biotechnology
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    • v.20 no.2
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    • pp.340-345
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    • 2010
  • The culture variables were optimized to increase 1,3-dihydroxyacetone (DHA) production by Gluconohacter oxydans ZJB09112 in shake flasks and bubble column bioreactors. After fermentation in the optimized medium (g/l: yeast extract 5, glycerol 2.5, mannitol 22.5, $K_2HPO_4$ 0.5, $KH_2PO_4$ 0.5, $MgSO_4{\cdot}7H_2O$ 0.1, $CaCO_3$ 2.0, pH 5.0), when five times of glycerol feeding were applied, $161.9{\pm}5.9\;g/l$ of DHA was attained at a $88.7{\pm}3.2%$ conversion rate of glycerol to DHA.

고정화 균체를 이용한 2,5-Diketo-Gluconic Acid 발효생산

  • 신봉수;신철수
    • Microbiology and Biotechnology Letters
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    • v.24 no.6
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    • pp.705-711
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    • 1996
  • For the efficient production of 2, 5-diketo-gluconic acid (2, 5-DKG) by the immobilized cells of Erwinia herbicola, basic characteristics of 2, 5-DKG fermentation were analyzed and a process employing immobilized cell reactor was developed. The immobilized cells appeared to have diffusion limitation, and a maximum production of 2, 5-DKG was accomplished with 2 mm diameters of immobilized beads. Long-term stabilities of the immobilized cells could be maintained by addition of 1.75% (w/v) polypep- tone. Repeated batch fermentations with about 80 mol% of 2, 5-DKG yields were carried out six times in the fluidized bubble column reactors filled with immobilized cells at an aeration rate of 6 vvm.

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The Synthesis of $BaTiO_3$ using continuous process in a bubble column reactor (기포탑반응기에서 연속공정을 이용한 $BaTiO_3$ 분말의 제조)

  • 현성호;김정환;허윤행
    • Journal of environmental and Sanitary engineering
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    • v.11 no.1
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    • pp.63-70
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    • 1996
  • The synthesis of high purity and ultra-fine $BaTiO_3$ by precipitation with gaseous $NH_3$ as precipitator was investigated to find an alternative process to solve various problems of recent wet methods. A synthesis process for $BaTiO_3$ powder using $NH_3$ gas as a precipitator in a bubble column reactor was experimentally successful in developing the production process of piezoelectric ceramic $BaTiO_3$ powder. And a 2.33m1/sec is approprite for the feed flow rate, $BaTiO_3$ powder produced under above the condition is spherical type, its particle size was about $0.2{\mu}m$.

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The Synthesis of PZT Using Continuous Process in a Bubble Column Reactor (기포탑반응기에서 연속공정을 이용한 PZT 분말의 합성)

  • 현성호;김정환;허윤행
    • Journal of environmental and Sanitary engineering
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    • v.13 no.1
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    • pp.147-156
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    • 1998
  • A synthesis process for PZT powder using $NH_{3}$ gas as a precipitator in a bubble column reactor was experimentally successful in develope a production process of piezoelectric ceramic PZT powder. Also as a reaction by coprecipitation, the crystalized PZT ceramic powder at the condition of over pH 9 could be attained. The time needed for reaction on the condition of $NH_{3}$ gas flow rate = 0.5 1/min, Ar gas flow rate = 2.0 1/min. Feed flow rate = 2.33 ml/sec was less than five minutes, so it could synthesize PZT powder for such a few moments. And the synthesized PZT powder was $0.17{\mu}m$ in diameter on an average.

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Semicontinuous Production of Blud Pigment from Gardenia Fruit by Immobilized Cells of Bacillus subtilis KS-380 Using Air Bubble Column Reactor (Air Bubble Column Reactor를 이용하여 Bacillus Subtilis KS-380의 고정화에 의한 치자로부터 청색 색소의 생산)

  • 류병호;조경자
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.19 no.5
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    • pp.395-402
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    • 1990
  • The semicontinuous production of blue pigment from gardenia fruit by immobilized cells of Bacillus subtilis KS-380 which excreted $\beta$-glucosidase was investigated in comparison with free cells, . The blue pigment produced higher productivity under the conditions of aeration of 0.2m$\ell$/min and 2mm diameter of gel beads by using 3.5% sodium alginate. Semicontinuous production by immobilized cell showed the highest productivity with replacement of fresh production medium in every 24hr for fourth fermentation cycle following the conditions of blue pigment productivity.

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Production of Shikonin by A Hairy Root Culture of Lithospermum erythrorhizon

  • Seo, Weon-Taek;Park, Young-Hoon;Choe, Tae-Boo
    • Journal of Microbiology and Biotechnology
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    • v.2 no.1
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    • pp.41-45
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    • 1992
  • Shikonin production was examined in a bubble column bioreactor system with the hairy roots of Lithosphermum erythrorhizon. The volumetric productivity was higher than those obtained from other reactor configurations with free or immobilized cells of the same cell line. The productivities of the bubble column reactor, with and without a product absorption trap, were 7.4 and 4.5 mg of shikonin/l/d, respectively. This indicated the importance of the product removal in the design and operation of the shikonin production system with hairy root culture.

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Effect of fermentor type on biopolymer production with Cordyceps militaris

  • Kim, Kyoung-Ju;Kim, Dong-Hyun;Park, Yang-Ho;Kwun, Kyu-Hyuk;Lee, Jung-Heon
    • 한국생물공학회:학술대회논문집
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    • pp.249-251
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    • 2003
  • The effects of fermentor types on biopolymer production with Cordyceps militaris has been studied in this articles. Since the shear stresses of stirred tank ferementor and bubble column fermentor were different, the mycelium growth and biopolymer production were different. The mycerial growth was high with the bubble column fermentor for the early stage but biopolymer production was lower than that with stirred tank fermentor. The production of biopolymer was closely related to shear stress to the cells and biopolymer production was increased with increased shear stress.

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Mass transfer characteristics of benzene in nonpolar solution (비극성용매 내의 벤젠 물질전달특성)

  • 최성우;김혜진;박문기
    • Journal of Environmental Science International
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    • v.11 no.6
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    • pp.605-610
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    • 2002
  • The absorption of benzene in nonpolar solution was studied in a laboratory-scale of bubble column varying of gas flow rates and gas-to-liquid ratios. A bubble column had a 0.8∼l$\times$10$\^$-3/ m$^3$ total volume (height 1500 mm, diameter 50 mm). Solution analysis was performed by GC-FID and GC-MSD. The objectives of this research were to select the best absorption fluid and to evaluate the mass transfer characteristics under specific conditions of each absorption. The results of this research were follow as: First, the heat transfer fluid is more efficient than the other nonpolar solution in removing VOC. Second, The benzene removal efficiency improved according to an increasing rate of gas flow. Also, volumetric mass transfer rate of column can be enhanced by increasing gas flow rate. Finally, the relation of gas flow rates, liquid amount, and volumetric mass transfer coefficient was obtained as follows. K$\_$y/a: 0.5906(V$\_$g//L)$\^$0.7611/ The following correlation of mass transfer coefficient and efficiency was proposed. v= 0.06078 K$\_$y/a$\^$0.2444/.