Kinetics and thermodynamics of oil extraction from sunflower seeds in the presence of aqueous acidic hexane solutions
Küçük Resim Yok
Tarih
2000
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Scientific Technical Research Council Turkey
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Oil extraction was performed in aqueous HCl, H2SO4 and H3PO4 solutions with n-hexane (C6H14) at 30, 40, 50 and 60 degreesC using 10 gr of sunflower seeds over 1 h with 10-min. sampling intervals. The optimum acid concentration was wt. 10% for each acid, and the highest oil yield was obtained in the extraction procedure with n-hexane containing H2SO4. The extraction process was observed with regard to the percent oil yield versus time, and the reaction order was found to be first-order kinetics by the differential method. The activation energy for the oil extraction kinetics of sunflower seeds with 10% H2SO4 was found to be E-alpha = 4.2 kJmol(-1), and the activation thermodynamic parameters at 60 degreesC were DeltaH(not equal)=1.43 kJmol(-1), DeltaS(not equal)=-309.3 Jmol(-1)K(-1) and DeltaG(not equal)=104.4 kJmol(-1). The enthalpy value was DeltaH=11.2 kJmol(-1), and the other thermodynamic parameters at 60 degreesC were DeltaS=36.75 Jmol(-1)K(-1) and DeltaG=-1.07 kJmol(-1).
Açıklama
Anahtar Kelimeler
Hexane, Kinetics, Oil Extraction, Sulfuric Acid, Sunflower Seed, Thermodynamics, Corn Germ, Cottonseed
Kaynak
Turkish Journal Of Chemistry
WoS Q Değeri
Q4
Scopus Q Değeri
N/A
Cilt
24
Sayı
3
