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Biodiesel Production from Oils Extracted from Date Pits

Green and Sustainable Chemistry 2017年第1期7卷 48-56页

作者： Sulaiman Al-Zuhair Hanifa Taher Salama Al Dhaheri Shereen Wajeeh mutasim nour Emad El-Najjar Chemical and Petroleum Engineering Department UAE University Al Ain United Arab Emirates Chemical and Environmental Engineering Department Masdar Institute Abu Dhabi United Arab Emirates Mechanical Engineering Department UAE University Al Ain United Arab Emirates School of Engineering & Physical Sciences Heriot-Watt University Dubai Campus Dubai United Arab Emirates

Biodiesel production had received a considerable attention as a green, non-toxic and renewable alternative to petroleum diesel. To avoid using vegetable oils, which are expensive and compete with food, as feedstock, waste oils have been proposed. However, these waste materials contain a large amount of free fatty acids that complicates the production process. In this work, biodiesel production using an alternative feedstock;namely oils from date-pits, has been investigated. These oils have the same favorable features of straight oils, and at the same time are considered waste, since they are extracted from a waste material. The yield of oils extracted using n-hexane in a Soxhlet apparatus was compared to that of oils extracted using methanol-chloroform solvent mixture. The extracted oils were then converted to biodiesel via transesterification with methanol in presence of Novozym𪥣 or Eversa®Transform. The highest oils extraction yield of 11.7%, per dry weight sample, was obtained using Soxhlet extraction apparatus compared to 8.9% using methanol-chloroform mixture. The highest biodiesel production yield was 30% of the oil used, achieved after 6 hours using Novozym𪥣 at 40°C, 5:1 methanol to oil molar ratio and 10wt% enzyme loading. By using a chemical alkaline catalyst, NaOH, at the same conditions, the yield was 27%.

关键词： Date Pits Soxhlet Lipase Biodiesel Enzymatic Reaction

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