Deoxygenation of Waste Chicken Fats to Green Diesel over Ni/Al2O3: Effect of Water and Free Fatty Acid Content
2015
Kaewmeesri, Rungnapa | Srifa, Atthapon | Itthibenchapong, Vorranutch | Faungnawakij, Kajornsak
The deoxygenation of waste chicken fat containing a high degree of free fatty acids (FFAs) and water has been implemented to produce a green diesel, known as biohydrogenated diesel (BHD). The effect of the water and free fatty acid content in the chicken fat on the conversion, BHD yield, and liquid/gas product distribution was investigated over a Ni/γ-Al₂O₃ catalyst in a trickle-bed reactor. The major reaction pathway was decarbonylation/decarboxylation (DCO/DCO₂), whereas hydrodeoxygenation was minor. Methane from methanation of the resultant CO/CO₂ and propane cracking was a major gaseous product. The FFA and water content improved the BHD yield and the overall contribution of the DCO/DCO₂. The presence of water accelerated the breakdown of the triglyceride molecules into FFAs. Therefore, waste chicken fat from food industries containing a high degree of FFAs and water content can be used as a low-cost feedstock for renewable diesel production without requirement of a pretreatment process.
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