科研之友
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摘要
Degumming is an essential step to remove the gum from crude vegetable oil in order to produce high-quality vegetable oil with minimum impurity for various applications, such as food or feedstock for production of biodiesel fuel (BDF). In the tropical monsoon region, degummed Jatropha oil is low-quality and the loss on degumming is serious because the removal of the gum is a difficult task. Herein, a facile and economic process for efficient removal of the gum from crude Jatropha oil was developed with consideration for the tropical monsoon climate in Southeast Asian Nations, in which phosphoric acid (PA) was used as a degumming agent. When crude Jatropha oil was agitated with 0.025wt% of PA and 2 vol% of water at 60 degrees C for 30min, followed by aging at 30 degrees C for 60-120min and filtering through the Teflon-coated filter, the PA-degummed Jatropha oil with ultra-low contents of phosphorus (P), alkali metals and alkaline earth metals was entirely good as oil feedstock for production of high-quality BDF based on the international fuel standards (i.e., EN 14214:2012). Moreover, the degummed Jatropha oil trapped in the unwanted gum was easily recovered by the sieving technique. Practical applications: For the first time, the degumming of crude Jatropha oil in the tropical monsoon climate is thoroughly studied. To form the gum completely, the amounts of PA and water are kept at 0.025wt% and 2vol% of crude Jatropha oil, respectively, and the agitation temperature is kept at 60 degrees C. The gum is removed through the Teflon-coated filter after aging at 30 degrees C for 60-120min, which is similar to the monthly mean temperatures ranging between 26 and 31 degrees C in Thailand. The advantages of this process are that it is simple and cost effective, since expensive instruments for separation and purification are not used, such as high-speed centrifuge or special membrane. Most of the degummed oil trapped in the unwanted gum can be easily recovered through a stainless steel sieve. Accordingly, this process is currently operating on a pilot plant scale in Thailand.
- 出版日期2015-7
