Experimental design of crystallization processes using Taguchi method

Miran Hvalec (Author), Andreja Goršek (Author), Peter Glavič (Author)

Abstract

Crystallization has become one of the most important unit operation in the chemical industries. The need to reduce the time from product discovery to market introduction is an inherent concern. In order to achieve the prescribedproduct quality characteristics, the process of engineering experimentation has to be optimized. Therefore, an experimental design method for crystallization processes is presented in this paper. Initially, the standardized Taguchi method was used to plan a minimum number of experiments. After identifying the working levels of the design factors and the main performance characteristics of the product under study, the method can be successfully applied to the crystallization processes. The simultaneous variations of the main crystallization parameters and their interactions were investigated using orthogonal array technique. A statistical analysis of ćsignal-to-noiseć ratio was followed by performing a variance analysis. After developing some special criteria, which depend on performance objectives, the optimal levels of the design factors were determined. Crystallization of KNO3 with desirable particle size as a performance characteristic was used to illustrate the design procedure. The effects of rotational frequency of the stirrer, linear cooling rate and added admixture on final particle size were studied. In order to keep the selected parameters constant during the experiment and to ensure reproduction of entire experiment the automated reaction calorimeter RC1 was used.

Keywords

kristalizacija;velikost delcev;Taguchi metoda;crystallization;particle size;Taguchi method;

Data

Language:	English
Year of publishing:	2004
Typology:	1.01 - Original Scientific Article
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	Slovensko kemijsko društvo
UDC:	66.065
COBISS:	8823574
ISSN:	1318-0207
Views:	1930
Downloads:	72
Average score:	0 (0 votes)
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Other data

Secondary language:	Slovenian
Secondary abstract:	Kristalizacija predstavlja eno najpomembnejših osnovnih operacij v kemijski industriji. Uvajanje vedno novih produktov na tržišče zahteva hitre in učinkovite raziskave. Predpisano kvaliteto produkta lahko dosežemo z optimiranjem procesov eksperimentiranja. V članku je predstavljena metoda eksperimentalnega načrtovanja procesov kristalizacije. V prvi fazi raziskav je bila za načrtovanje minimalnega števila eksperimentov uporabljena standardizirana Taguchijeva metoda. Z določitvijo nivojev izbranih procesnih parametrov in glavnih značilnosti produkta, je metoda primerna za uporabo na procesih kristalizacije. Tehnika ortogonalnih tabel je omogočila hkratno spreminjanje procesnih parametrov in zasledovanje njihovih medsebojnih vplivov. Izračunu statističnega razmerja S/N je sledila analiza variance. V drugi fazi so bili za določitev optimalnih nivojev proučevanih faktorjev razviti posebni kriteriji, odvisni od zahtevane kvalitete produkta. Eksperimentalno načrtovanje je bilo izvedeno na primeru $KNO_3$, pri čemer je velikost kristalnega zrna predstavljala merilo za ocenjevanje kvalitete produkta. V našem primeru so bili proučevani faktorji vrtilna frekvenca mešala, hitrost ohlajanja suspenzije in dodatek različnih topil. Kristalizacija je bila izvedena v avtomatskem laboratorijskem reakcijskem kalorimetru RC1 (Mettler Toledo), ki je omogočal vzdrževanje konstantnih parametrov procesa in zagotovil ponovljivost rezultatov. Izvajanje eksperimentov v visoko avtomatizirani opremi omogoča uporabo rezultatov pri povečavah na večje volumne.
Secondary keywords:	kristalizacija;velikost delcev;Taguchi metoda;
URN:	URN:NBN:SI
Type (COBISS):	Scientific work
Pages:	str. 245-256
Volume:	ǂVol ǂ51
Issue:	2
Chronology:	2004
Keywords (UDC):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;chemical technology;chemical and related industries;kemijska tehnologija;kemijske in sorodne industrije;chemical technology of liquids;processes and equipment for treatment of or with liquids;kemijska tehnologija tekočin;procesi in oprema za obdelovanje tekočin ali za obdelovanje z njimi;
ID:	1437453