Study On In-situ Preparation Of Fatty Acid Ester From Low Quality Rice Bran Oil

World energy crisis has become the foremost crucial topic in this new era.Increasing concerns regarding environmental impacts, the soaring price of petroleumproducts in the world market together with the constant depletion of fossil fuels haveled to intensive search for alternative energy sources that are not only renewable butsustainable. In this situation, bioengery such as fatty acid methyl ester (FAME) hasattracted a lot of attention. FAME has similar molecular structure and combustibilitywith the fossil diesel oil. It is typical renewable environmentally friendly energy, andusually called biodiesel.The Fatty Acid Methyl Ester which has many advantages isused as fuel in current compression ignition (CI) engines. Fatty Acid Methyl Esterhas higher oxygen content than petroleum diesel and it shows great reductions inemission of particulate matter, monoxide, sulfur, hydrocarbons, smoke and noise. Inspite of the favorable effect on the environment, the economic aspect of Fatty AcidMethyl Ester production is likely to be a barrier for the problem of raw material,which has become a major constraint to the further development of this industry.Because the cost of the oil-containing material takes more than75%cost of the FattyAcid Methyl Ester product, lots of researches focus on the cheap raw materials. Thus,finding a supply of abundant, cheap and stable raw material will be important forbiodiesel production.Rice bran oil (RBO) is an important byproduct of rice. At present, the totalpotential amount of RBO is about6,000,000tons per year in China. Due to thepresence of an active lipase in the bran, the content of free fatty acid (FFA) in RBOis much higher than other edible oils. About60%-70%of the RBO production is fornon-edible purpose, Therefore, it can be used as biodiesel feedstock due to theirhighly quantity and low prices. In conclusion, rice bran oil (RBO) for its cheat asalternative feedstock for preparation FAME has great potential in China.Thus, we design a process of in-situ preparation of Fatty Acid Methyl Ester (FAME), with low quality rice bran oil as raw materials. we investigated the bestexperimental conditions by using low quality rice bran oil as raw materials，anhydrous sodium sulfate as water absorbent and concentrated sulfuric as acidcatalyst; Then, we investigated the optimal experimental conditions of in situpreparation of Fatty Acid Methyl Ester with methanol sodium as a catalyst.P-toluenesulfonic acid catalyzed low quality rice bran oil and examined theesterification of the best experimental conditions.Firstly, we investigated experimental conditions of production of Fatty AcidMethyl Ester with soybean oil as simulated raw material. Conclusion: Raw soybeanoil is30g, and the optimum conditions for transesterification of soybean oil with theanhydrous methanol as solvent and methanol sodium as catalyst were found to be64℃reaction temperature,2h reaction time, oil/methanol mole ratio1:6and0.5%catalyst (w/w). Under the optimum conditions，conversion rate of95.16%can beachieved.Second, in the third chapter, we investigated the best experimental conditionsby using low quality rice bran oil as raw materials, anhydrous sodium sulfate aswater absorbent, anhydrous methanol as solvent and concentrated sulfuric as acidcatalyst. Conclusion: Raw rice bran oil is20g, and the optimal reaction conditionswere obtained by this experiment: reaction temperature64℃, oil/methanol moleratio1:16,1.7%catalyst (w/w) and reaction time3.0h，anhydrous sodium sulfate2g.Under the optimum conditions, a97.55%yield of methyl esters was reached. Then,sodium hydroxide was added to experiment setup after the esterification wascompleted，in order to neutralize acid catalyst. We investigated the best experimentalconditions of in-situ production of FAME from rice bran oil (RBO). Conclusion:Raw rice bran oil is20g, and the optimal reaction conditions were obtained by thisexperiment: oil/methanol mole ratio1:6,0.4%catalyst (w/w) and reaction time1.5h,anhydrous sodium sulfate2g, sodium hydroxide0.278g. Under the optimumconditions, conversion rate reached85.31%.Finally, On the basis of the experiment in Chapter III, the organicp-toluenesulfonic acid catalyzed rice bran oil and polyethylene glycol (1000) Preparation of polyethylene glycol fatty acid ester. Conclusion: rice bran oil is20g,and the optimal reaction conditions were obtained by this experiment: reactiontemperature120℃, oil/methanol mole ratio1:2and0.3%catalyst (w/w), theesterification rate reached97.36%.The process of in-Situ Preparation of Fatty Acid Methyl Ester from low qualityRice Bran Oil is simple, anhydrous sodium sulfate recycling, solvent recycling,pollution-free. Not only shortening the reaction time, but also improving esterifi-cation rate and transesterification rate, respectively.