Preliminary experimental investigation into scale-up of agglomerative precipitation of calcium carbonate crystals

• Autorzy: Wójcik J.A. , Jones A.G.

Warianty tytułu

PL

Wstępne badania doświadczalne nad przenoszeniem skali w procesie aglomeracyjnego strącania węglanu wapnia

• Języki publikacji: EN

Abstrakty

EN

A scale-up experiments of CaCO3 precipitation in 0.3, 1.0, and 5.0 dm3 crystallizers were performed. For small input concentrations an influence of scale on product size and output concentration was observed. However, for large input concentration there was practically no effect detected. Bimodality of Particle Size Distribution (PSD) was once more time confirmed. Influence of the stirrer power input on PSD is most visible in the smallest vessel. A size-dependent aggregation-disruption model was used for extracting kinetic information. An experimental evidence was obtained that by using the same stirrer power input (micromixing level), the macromixing plays a very important role, deciding for output PSD and concentration.

PL

Przeprowadzono doświadczenia nad przenoszeniem skali dla precypitacji CaCo3 w krystalizatorach o objętości 0,3, 1,0 i 5,0 dm3. Dla małych stężeń zasilania zaobserwowano wpływ skali na rozmiar produktu i stężenie wylotowe. Dla większych stężeń wlotowych praktycznie nie stwierdzono takiego wpływu. Potwierdzono dwumodalność rozkładu ziarnowego produktu. Wpływ jednostkowej mocy mieszania na rozkład ziarnowy był najbardziej widoczny w najmniejszym zbiorniku. Do oszacowania kinetyki precypitacji zastosowano zależność agregacji i ścierania od rozmiarów aglomeratów. Potwierdzono doświadczalnie, że przy tej samej jednostkowej mocy mieszania (tym samym poziomie mikromieszania) decydującą rolę odgrywa makromieszanie, wpływając na rozkład ziarnowy produktu i stężenie wylotowe roztworu.

• Wydawca: Komitet Inżynierii Chemicznej i Procesowej Polskiej Akademii Nauk
• Czasopismo: Inżynieria Chemiczna i Procesowa
• Rocznik: 1999
• Tom: T. 20, z. 3
• Strony: 395--408
• Opis fizyczny: Bibliogr. 29 poz.

Twórcy

autor

Wójcik J.A.

• Institute of Chemical and Process Engineering, Silesian University of Technology, ul. ks. M. Strzody 7, 44-100 Gliwice

autor

Jones A.G.

• Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, U.K.

Bibliografia

• [1] SEAMAN W.C., Crystallization equipment design, Ind. Eng. Chem., 1961, 53, 8, 612-622.
• [2] MULLINJ.W., Crystallization, 3 Rev. Ed., Buttterworth-Heinemann, 1993.
• [3] BAMFORTH, A.W., Industrial crystallization, 1965, Leonard Hill, London.
• [4] GARSIDE J., JANCIC S.J., Measurement and scale-up of secondary nucleation kinetics for the potashalum-water system, AIChE J, 1979, 25. 6, 948- 958.
• [5] BOURNE, J.R., HUNGERBUEHLER K., An experimental study of scale-up of a well-stirred crystalliser, 1980, Trans. I. Chem. E., 1980, 58, 51-58.
• [6] GARSIDEJ., Industrial crystallization from solution. Chem. Engng Sci., 1985,40, 1,3-26.
• [7] PLOp R., TENGLER, T., MERSMANN A., 1986, Scale-up of MSMPR crystallizers. Ger. Chem. Eng., 9, 1,42-48.
• [8] BUDZ, J., JONES, A.G., CHIANESE, A., MAZZAROTTA B., Efect of scale on crystallization kinetics of potassium sulphate in batch and continuous crystallizers [in:] Industrial Crystallization 87, Eds. J. Nyvlt and S. Zacek, 1989, Elsevier, 315-318.
• [9] SYNOWIEC P., JONES A.G., SHAMLOU P.A., Crystal break-up in dilute turbulently agitated suspen¬sions. Chem. Engng Sci., 1993, 48, 3485-3495.
• [10] MERSMANN A., RENNIE F.W., Design of crystallizers and crystallization, [in:] Crystallization Tech¬nology Handbook, Ed. A. Mersmann, 1995, New York, Marcel Dekker Inc., 215-325.
• [11] MEADHRA O.R., VAN ROSMALEN G.M., Scale-up of ammonium sulphate crystallization in a DTB crystallizer, Chem. Eng. Sci., 1996, 51,16, 3943- 3950.
• [12] OLDSHUE J.Y., Agitation and mixing, [in:] Handbook of industrial crystallization, Ed. A.S. Myerson, 1993, Boston, Buttterworth-Heinemann, 165-177.
• [13] FRANCK R., DAVID R., VILLERMAUX J., KLEIN J.P., Crystallization and precipitation engineering. II. A chemical reaction engineering approach to salicylic acid precipitation: modelling of batch ki¬netics and application to continuous operation, Chem. Eng. Sci., 1988, 43, 1, 69-11.
• [14] KLEIN J.P.. DAVID R., Reaction crystallization, [in:] Crystallization Technology Handbook, Ed. A. Mersmann, 1995, New York, Marcel Dekker Inc., 359-400.
• [15] SONEHL, O., GARSIDE J., Precipitation. Basic principles and industrial applications, 1992, Oxford, Buttterworth-Heinemann.
• [16] NIENOW A., Personal communication at the 17th Industrial Crystallization Course, 1997, London, UCL.
• [17] WÓJCIK J.A., JONES A.G., Experimental investigation into dynamics and stability of continuous MSMPR agglomerative precipitation of CaCOj crystals, Trans. I. Chem. E, Part A, 1997, 113-118.
• [18] POHORECKI R., BALDYGA J., New model of micromixing in chemical reactors. 2. Application to a stirred tank reactor, Ind. Eng. Chem. Fundam., 1983, 22, 398-405.
• [19] BALDYGA, J., BOURNE J.R., A fluid mechanical approach to turbulent mixing and chemical reaction. Part III Computational and experimental results for the new micromixing model, Chem. Eng. Commun., 1984, 28,259-281.
• [20] GEISLER R., MERSMANN A., Voir H., Macro- and micromixing in stirred tanks. Int. Chem. Eng., 1991, 31,4,642-653.
• [21] MERSMANN A., ANGERHOFERM., FRANKE J., Controlled precipitation, Chem. Eng. Technol., 1994,17, 1-9.
• [22] BALDYGA J., PODGORSKA W., POHORECK.1, R., Mixing - precipitation model with application to double feed semibatch precipitation, Chem. Engng Sci., 1995, 50, 1281-1300.
• [23] AYAZI SHAMLOU P., Ed., Processing of Solid-Liquid Suspensions, 1993, Oxford, Butterworth Heinemann.
• [24] AYAZI SHAMLOU P., SYNOWIEC P., ZOLFAGHARIAN A., Critical suspension conditions in stirred crys¬tallizers, Chem. Engng J., 1994, 55, 5, 561-571.
• [25] HOSTOMSKY J., JONES A.G., Calcium carbonate crystallization kinetics, agglomeration and form during continuous precipitation from solution, J. Phys. D., 1991, 24, 165-170.
• [26] RANDOLPH A.D., LARSON M.A., Theoiy of particulated processes, Scd Ed., 1988, San Diego, Aca¬demic Press.
• [27] RAMKRISHNA D., The Status of population balances. Rev. Chem. Eng., 1985, 3, 1, 49-95.
• [28] SYNOWIEC P., JONES A.G., AYOZI SHAMLOU P., Crystal break-up in dilute turbulently agitated sus¬pensions, Chem. Engng Sci., 1993, 48, 3485-3495.
• [29] W6JCIK J.A., JONES A.G., Particle disruption of precipitated CaCOj crystal agglomerates in turbu¬lently agitated suspensions, Chem. Engng Sci., 1998, 53, 5, 1097-1101.