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BAZİK AMBERLİT REÇİNELER VARLIĞINDA TRANSESTERİFİKASYON REAKSİYONU VE YÜZEY CEVAP METODU İLE OPTİMİZASYONU

TRANSESTERIFICATION REACTION OVER BASIC AMBERLYST RESIN CATALYSTS AND OPTIMIZATION VIA RESPONSE SURFACE METHODOLOGY

Journal Name:

  • Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

Publication Year:

  • 2012

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
In this study, transesterification activity of sunflower oil with methanol was tested over Amberlyst A-21 (A-21) and Amberlyst A-26 (A-26) type ion exchange resins which have high Hammett basic strength. Transesterification reactions were carried out in a three necked batch reactor at operating temperatures of 40 to 55°C, methanol-oil initial molar ratio of 3:1 to 6:1 and 1% to 5% (of oil) weight percentages of catalysts. A-26 catalyst was determined to be more active than A-21, with a % 91 conversion at 50°C and 6:1 methanol-oil initial molar ratio. % 88 conversion was achieved with the same reaction conditions over A-21 catalyst. Experiments were designed by using Box-Wilson experimental design method. Experimental results were analyzed by using “Design Expert 8.0.6.1” program. Mass transfer limitations was not significant. An increase in temperature and initial molar ratio of reactants caused an increase in biodiesel conversion. Hammett basic strength of these two catalysts were found as H_>9.8. Swelling behaviour of the polymeric structured catalysts was measured %100 at all reaction temperatures.
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Abstract (Original Language): 
Bu çalışmada, ayçiçek yağının metanol ile transesterifikasyonu, Amberlit A-21 (A-21) ve Amberlit A-26 (A-26) tipi yüksek Hammett baziklik kuvvetine sahip iyon değiştirici reçineler varlığında test edilmiştir. Transesterifikasyon reaksiyonları üç boyunlu kesikli bir reaktörde, 40-55°C sıcaklık aralığında, metanol-yağ başlangıç molar oranları 3:1 ile 6:1 ve %1 ile %5 katalizör ağırlık yüzdesinde (yağın) yürütülmüştür. A-26 katalizörü , 50oC ve 6:1 metanol:yağ başlangıç molar oranında % 91 dönüşümle A-21 katalizörüne göre daha yüksek aktivite göstermiştir. Aynı reaksiyon şartlarında A-21 katalizörlüğünde % 88 dönüşüme ulaşılmıştır. Box-Wilson Deneysel Tasarım Yöntemi’ne göre belirlenen reaksiyon şartlarında elde edilen sonuçlar Design Expert 8.0.6.1 programı kullanılarak analiz edilmiştir. Sıcaklık ve reaktanların başlangıç molar oranındaki artışın trigliserit dönüşümünü artırdığı gözlenmiştir. Çalışılan reaksiyon koşullarında kütle transfer direncinin olmadığı belirlenmiştir. Her iki katalizörün de Hammett baziklik kuvvetleri H_>9,8 olarak bulunmuştur. Polimerik yapılı bu katalizörlerin metanol içerisindeki şişme davranışları ise incelenen tüm reaksiyon sıcaklıklarında %100 olarak ölçülmüştür.
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