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MSMPR 반응기에서 기-액 반응성 탄산칼슘 결정화에 미치는 교반속도 영향
Effect of Agitation on Gas-Liquid Reaction Crystallization of Calcium Carbonate in an MSMPR Reactor
HWAHAK KONGHAK, February 1998, 36(1), 49-55(7), NONE
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Abstract
Rushton형 MSMPR 반응기내에서 이산화탄소와 수산화칼슘의 기-액 반응에 의해 생성되는 탄산칼슘 결정화에 교반이 미치는 영향에 관해 실험적으로 연구하였다. 생성된 탄산칼슘 결정의 부피분율분포는 이중분포 형태를 나타내었으며 결정입도분포는 반로그 그래프 상에서 두 개의 직선으로 나타났다. 이와 같은 현상은 탄산칼슘결정이 크기에 의존하는 성장과정을 거치기 때문이며 이것은 반응기내의 용액교반과 밀접한 관계가 있다. 교반속도가 증가함에 따라 결정성장속도는 증가하였으나 핵생성속도는 감소하는 결과를 나타내었다. X-선 회절 및 전자현미경 관찰에 의해, 본 연구에서 생성된 탄산칼슘 결정의 결정계 및 모양은 정방형 calcite로 나타났다.
Experimental investigation of the agitation effect on crystallization of calcium carbonate, which was produced by gas-liquid reaction of CO2 and Ca(OH)2 in a Rushton-type MSMPR reactor, was carried out. The volume fraction distribution of calcium carbonate produced was bimodal and the crystal population distribution showed two straight lines on a semi-log plot. These phenomena on distributions of crystal volume fraction and crystal population were supposed to be due to size-dependent growth process of calcium carbonate crystals. With increasing the agitation speed, the crystal growth rate of calcium carbonate increased, but the crystal birth rate of calcium carbonate decreased. From XRD and microscopic studies, the present calcium carbonate crystals were revealed as cubic calcite.
Keywords
References
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Mullin JW, "Crystallization," 2nd ed., Butterworths, London (1972)
Tavare NS, AIChE J., 32, 705 (1986)
Tosun G, "Sixth European Conference on Mixing," Pavia, Italy, 161 (1988)
Kim WS, Tarbell JM, Chem. Eng. Commun., 120, 119 (1993)
Nancollas GH, Reddy MM, J. Colloid Interface Sci., 37, 824 (1971)
Karpinski PH, Chem. Eng. Sci., 40, 641 (1985)
Chakraborty D, Agarwal VK, Bhatia SK, Bellare J, Ind. Eng. Chem. Res., 33(9), 2187 (1994)
Chakraborty D, Bhatia SK, Ind. Eng. Chem. Res., 35(6), 1985 (1996)
Chakraborty D, Bhatia SK, Ind. Eng. Chem. Res., 35(6), 1995 (1996)
Tai CY, Chen PC, AIChE J., 41(1), 68 (1995)
Tai CY, Chen PC, Shih SM, AIChE J., 39, 1472 (1993)
Yoshio O, "1st Workshop on Manufacture and Utilization Technology of Precipitated Calcium Carbonate," Taejon, Korea, 33 (1996)
Yagi H, Iwazawa A, Sonobe R, Matsubara T, Hikita H, Ind. Eng. Chem. Fundam., 23, 153 (1984)
Wachi S, Jones AG, Chem. Eng. Sci., 46, 3289 (1991)
Juvekar VA, Sharma MM, Chem. Eng. Sci., 28, 825 (1973)
Sada E, Kumazawa H, Lee C, Fujiwara N, Ind. Eng. Chem. Process Des. Dev., 24, 255 (1985)
Becker GW, Larson MA, Chem. Eng. Prog. Symp. Ser., 65(95), 14 (1969)
Fitchett D, Tarbell JM, AIChE J., 35, 511 (1990)
이상구, 서울대학교 공학박사학위논문 (1995)
Hostomsky J, Jones AG, J. Phys. D: Appl. Phys., 24, 165 (1991)
Tavare NS, Shah MB, Garside J, Powder Technol., 44, 13 (1985)
Garside J, Jancic SJ, AIChE J., 25, 948 (1979)
Schierholz PM, Stevens JD, AIChE Symp. Ser., 71(151), 248 (1975)
Kim WS, Tarbell JM, Chem. Eng. Commun., 146, 33 (1996)
