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Waste edible grease preparation of biodiesel and marking the test

Author: LiShiYi
Tutor: WangHua
School: Kunming University of Science and Technology
Course: Thermal Power Engineering
Keywords: biodiesel waste edible oils and fats bleach super-critical
CLC: TK6
Type: Master's thesis
Year: 2009
Downloads: 162
Quote: 0
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Abstract


With the increase of oil price, energy shortage problem become more and more acute. How to find a cheap and value raw material become to the important point in this reaches field. So much force on waste edible oils and fats is because of its widely source and low price.At the same time as a result of the waste edible oils and fats without clear management channels, many people who Collected the waste edible oils and fats, put the them as Vegetable oil into market again after Simple processing that posing a serious threat to human’s health. Preparated biodiesel by waste edible oils and fats can solved these two problems.Because of the features of high acid value and much more free fatty acids, the paper used the orthogonal experiments to research the reaction between the waste edible oils and fats and methanol under the sup-critical Environment between 260℃-300℃.Found the optimize conditions is at 300℃, and 30 min reaction time with a ratio of methanol to oil 4:1(V:V). Study the bleach of waste edible oils and fats, because of the poor quality appearance of the biodiesel which is preparated by the methods of super-critical,and the Methods of improve this situation is Limited,After used the bleach of activited attapulgite clay, activated bentonites,activated carbon, hydrogen peroxide to bleach, Found the best program:initial temperature of 50℃, the end temperature of 100℃, bleach time of 10min, the Percentage of activated bentonites amount is 15%, the input frequency of activated bentonites is 3, stirring speed of 350rpm. In this condition, the bleach rate up to 97.23%;Then, study the prepration of biodiesel by the methods of super-critical after bleach. The optimize conditions of this situation is at 300℃, and 30 min reaction time with a ratio of methanol to oil 4:1(V:V). Its conversion rate of esterification 96.21%, and the conversion of ester-exchange reaction rate is 93.24%.The appearance of biodiesel quality has significantly improved after bleach.

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CLC: > Industrial Technology > Energy and Power Engineering > Bio-energy and its utilization
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