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| Ultrasound-microwave-assisted preparation of biodiesel from oleic acid using concentrated sulfuric acid as catalyst |
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| DOI： |
| KeyWord:esterification ultrasound-microwave biodiesel response surface |
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| Abstract: |
| With concentrated sulfuric acid as catalyst, biodiesel was prepared by esterification of oleic acid (vegetable oil hydrolysate) and methanol by ultrasound-microwave-assisted technology. The effects of microwave power, reaction time, catalyst dosage, molar ratio of methanol to oleic acid on conversion rate of oleic acid were investigated. The process conditions were optimized by response surface methodology. The results showed that the introduction of ultrasound and microwave enhanced the mass transfer and heat transfer process and shortened the reaction time. The optimal process conditions were obtained as follows: ultrasonic power 50 W, microwave power 125 W, reaction time 17 min, catalysts dosage 25% and molar ratio of methanol to oleic acid 19∶?1. Under these conditions, the conversion rate of oleic acid reached above 98%． |
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