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Statistical design of experiments of acid activation of smectite clay from Serbia and its bleaching capacity

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2009
Authors
Petrović, Srđan
Novaković, Tatjana
Rožić, Ljiljana
Article (Published version)
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Abstract
BACKGROUND: Serbian smectite clay has been activated using a response surface method with central composite design. Because, among the criteria of an edible oil, colour is the most important factor in the commercial value of the oil, and since the colour is due to the presence of pigments such as beta-carotene in the crude oil, acid-activated clay was used for decolourisation of soybean oil. RESULTS: The effects of five parameters, namely, temperature, time, acid strength, solid/liquid ratio and stirring speed, on the process of acid activation of the clay and its bleaching capacity were determined using a statistical model. The results indicated that all parameters were significant factors in the bleaching capacity of acid-activated clay, and a quadratic polynomial equation for bleaching capacity was obtained by multiple regression analysis. The optimal bleaching capacity was estimated to be 96.61% for an experimental run under the following conditions: activation temperature 80 degre...es C, HCl concentration 4.78 mol L-1, stirring speed 450 rpm, solid/liquid ratio 1:4.5 and activation time 2.81 h. CONCLUSIONS: The central composite design, regression analysis and response surface method were effective in identifying the optimal conditions for bleaching capacity of acid-activated smectite.

Keywords:
smectite clay / acid activation / full factorial design / bleaching capacity / soybean oil
Source:
Journal of Chemical Technology and Biotechnology, 2009, 84, 2, 176-179
Publisher:
  • Wiley, Hoboken
Projects:
  • Ministry of Science and Environmental Protection of the Republic of Serbia - 6712
  • Sinteza, karakterizacija i testiranje katalitičkih svojstava specijalno dizajniranih materijala (RS-142019)

DOI: 10.1002/jctb.2019

ISSN: 0268-2575

WoS: 000262789100005

Scopus: 2-s2.0-66149153476
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/490
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