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The Biodiesel Production from Wasted Edible Oil by Two Steps Catalyzed by Resin

Author: CuiXiaoYan
Tutor: XuGuiZhuan
School: Henan Agricultural University
Course: Agricultural Biological Environmental and Energy Engineering
Keywords: biodiesel resion wasted edible oil two steps esterification
CLC: TE667
Type: Master's thesis
Year: 2011
Downloads: 17
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Abstract


With the rapid development of social economy, energy shortage and environmental pollution problems increased seriously. Biodiesel as a kind of renewable alternative energy attracted worldwide attention. Used wasted edible oil with high acid value as raw material to produce biodiesel can reduce the cost and improve the market competitiveness. At present, the production from wasted edible oil all adopts homogeneous catalysts, and there are some shortcomings, such as catalyst dosage is large, the reaction time is long and ester conversion is low. This paper used wasted edible oil with high acid value as raw material to produce biodiesel by two steps. At first, ion exchange resin SXC-9, D002, D061, D072 was used as heterogeneous catalysts, catalyzing the esterification of wasted edible oil and methanol intermittently and continuously, catalyzed the free fatty acid in the wasted edible oil to produce biodiesel; and then alkali was used to catalyze the remaining triglyceride to produce biodiesel; through the two steps, the esterification of wasted edible oil can be used completely. The main research conclusion of this article were as follows:(1) By single factor experiment, compared the catalytic effect of cation exchange resin SXC-9, D002, D061, D072 for the esterification reaction of wasted edible oil and methanol, found that SXC - 9 can get the optimum catalytic effect, and the conditions are reaction temperature was 65℃, molar ratio of methanol and oil was 15:1, catalyst was 30%, reaction time was 9h, under this condition, esterification conversion reached 90.24%.(2) The esterification reaction was proceed in a single reactor continuously catalyzed by SXC-9.The optimum conditions were: reaction liquid flow rate was 0.2 ml/min, catalyst density was 0.5 g/ml, molar ratio of methanol and oil was 18:1, the esterification conversion of wasted edible oil with high acid value reached 80.26% . To proceed esterification reaction in two reactors in series continuously, esterification conversion increased to 93.89%.(3) To examine the repeated using life and catalyzing effect after regeneration, the catalytic efficiency dropped to 50% after continuously being used 100 hours, and compared with the fresh catalyst, the relatively efficiency of the catalyst restored to 95% after regeneration. Resin can still keep certain catalytic activity after regeneration.(4) Used sulfuric catalyzed the transesterification reaction of wasted edible oil with high acid value and methanol directly, in the conditions of reaction temperature was 70℃, molar ratio of methanol and oil was 30:1, catalyst was 4%, reaction time was 6h, the conversion rate reached 87.24%. There was almost 78.50% wasted edible oil transesterified to biodiesel. And the transesterification reaction of the wasted edible oil was catalyzed KOH after the pre-esterification, in the conditions of reaction temperature was 65℃, molar ratio of methanol and oil was 9:1, catalyst was 1%, reaction time was 1h, the conversion reached 95.48%, There was almost89.65% wasted edible oil transesterified to biodiesel, total conversion rate reached 80.68%.(5) The technical economic analysis proved that when the wasted edible oil with high acid value was used as raw material, adopt the production technology of alkaline catalytic after pre-esterification to prepare biodiesel is better than acid catalyzed production technology. It has several advantages, such as products easy to separate, waste water discharge is fewer, reaction time is shorter, part of catalyst can be reused.

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