• Title, Summary, Keyword: Bubble Column

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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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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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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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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 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.

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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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/.

Field Application of Surface Insulation Curing Method to Cold Weather Concreting (한중콘크리트의 현장 표면단열 양생공법 시공사례 연구)

  • Kim Jong-Back;Lim Choon-Goun;Han Min-Cheol;Kim Seoung-Soo;Han Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.25-28
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    • 2005
  • This study investigates the field application of surface insulation curing method, which combined double layer bubble sheet(DBS) and thick-curing-material(TCM) for cold weather concreting. According to the test, deck slab, curing only upper section with DBS and TCM, does not make big different temperature history with that, curing both upper and bottom section during daily average temperature 6.5t. It is concluded that combination of DBS and TCM in only upper section can be safely cured in early period of time during cold water concreting. The field test was carried out with this favourable data. The upper deck slab was insulated by combination of DBS and TCM, and the construction was surrounded by tent. in order to protect from outside wind. The test result shows that the lowest temperature of deck slab indicated 6$ ^{circ}C $. It demonstrated that this curing method can resist early frost and save construction cost in the side of management and saving labor cost, compared with previous method. In addition, the column specimen, combined both form and bubble board, exhibited favorable temperature history, due to internal hydration heat insulation effect.

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Scaling of Gas-Slurry Mass transfer in Three-phase Bubble Column Reactors (삼상슬러리 기포탑 반응기에서 기체-슬러리 물질전달의 Scaling)

  • Lim, Hyunoh;Seo, Myungjae;Kang, Yong;Jung, Heon;Lee, Hotae;Kim, Sangdon
    • 한국신재생에너지학회:학술대회논문집
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    • pp.111.2-111.2
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    • 2010
  • 삼상슬러리 기포탑 반응기의 설계 및 Scale-up을 위하여 기포탑의 직경변화에 따른 기체-슬러리 계면에서의 물질전달 현상의 Similarity를 검토하고, 기체-슬러리 계면에서의 물질전달 현상과 슬러리 기포탑 반응기의 운전변수 및 반응물들의 물성들과의 연관성을 고찰하기 위하여 삼상슬러리 기포탑의 물질전달계(System)에서 주요 파라메타를 도출하였으며, 이들 파라메터들을 이용하여 슬러리 기포탑반응기의 물질전달 Scaling을 검토하였다. 물질전달계의 주요제어인자로는 기체-액체 부피물질전달계수($k_La$), 슬러리상의 확산도($D_{SL}$), 기포탑의 직경(D), 기포탑 반응기에 유입되는 기체의 유입속도($U_G$), 기포탑 반응기 내부의 연속상인 슬러리상의 표면장력(${\sigma}_{SL}$), 슬러리상과 기체상간의 밀도차(${\rho}_{SL}-{\rho}_G$) 그리고 슬러리상의 점도(${\mu}_{SL}$)등 슬러리 상의 물성을 선정하였으며 중력가속도(g)를 선정하였다. 물질전달계의 Scling을 검토하기위하여 이를 재구성하였으며 기포탑 반응기의 구조와 직경이 변화함에 따라 이들 무차원군의 변화양상을 고찰하였다. 실험적으로 측정된 물질전달계수와 Scaling에 의해 예측된 물질전달계수를 비교 검토함으로써 본 연구의 Correlation의 적용범위를 제시하였다.

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