Dissertation > Excellent graduate degree dissertation topics show

Study of aqueous methanol dehydration method in the process of high acid value oil drop acid esterification

Author: YeJieLian
Tutor: SuYouYong
School: Kunming University of Science and Technology
Course: Agricultural Biological Environmental and Energy Engineering
Keywords: biodiesel high acid value oils aqueous methanol reducing the acidvalue with the esterification molecular sieve copper sulfate
CLC: TE667
Type: Master's thesis
Year: 2013
Downloads: 39
Quote: 0
Read: Download Dissertation

Abstract


The raw material must be free of water and the acid value of it is less than1.0mgKOH·g-1when biodiesel is prepared with alkali catalyzed transesterification. With the oil of high acid value as feedstock for biodiesel, it need reduce the acid value through esterification because of its high acid value. Traditional process mainly adopts homogeneous acid catalyzed esterification method, but it mainly exist the following problems:as the esterification reaction of free fat in material and methanol is a reversible reaction, the reaction reached chemical equilibrium after a period of time. So it is difficult to react completely and the acid value of material could not achieve requirements by base-catalyzed transesterification produce biodiesel. How to promote the reaction move to the positive direction is the key to reduce the acid value of feedstock through esterification. The best way is remove the water of esterified product continuously for promoting the reaction toward the positive direction.In this paper, the simple and fast measuring method of water content in methanol was established through the conductivity method, colorimetric method, and copper sulfate method were studied. The removing effect of the water was studied with molecular sieve and copper sulfate in methanol and in reducing the acid value through esterification, and the condition of the reagent of removing water was optimized. The optimum reaction conditions of reducing high-acid of biodiesel feedstock with high acid value with circulating gaseous esterification were studied under adding copper sulfate. The following result was obtained through research:1) The results of the measuring method of water content in methanol show that:①The error of methanol solution of sodium nitrate, methanol solution of ammonium nitrate and methanol solution of ammonium chloride was19.5%,25%and1.0%with the conductivity method, respectively. The degree of accuracy of methanol solution of ammonium chloride was best in these methanol solutions of salt. Therefore, the more suitable salt was cobalt nitrate for the conductivity.②The error of methanol solution of cobalt nitrate and methanol solution of cobalt chloride was0.833%and1.291%with the colorimetric method, respectively. The degree of accuracy of methanol solution of cobalt chloride was best in these methanol solutions of salt. Therefore, the more suitable salt was cobalt choride for the colorimetric.③The maximum error was1.0%and the minimum was0.48%with the copper sulfate method, the method of copper sulfate was a simple and accurate for the measuring method of water content.2) The results of the removing effect of the water in methanol show that:①The best removing effect of water in methanol was the4A molecular sieve in3A,4A,5A and13X sieves. Along with the smaller water content in methanol and the larger the amount of molecular sieve, the better the removing effect of water in methanol.②The best time for removing the water of anhydrous copper in methanol was30min, and with the larger the amount of anhydrous copper sulfate, the better the removing effect of water, the water content in methanol had little effect on the removing effect of water in methanol.3) The oleic acid as raw materials to simulate the high acid value,4A molecular sieve and copper sulfate as the reagent of removing water for removing water in methanol in reducing the acid value through esterification shows that:①Using the4A molecular sieves as the reagent of removing water, the conversion rate of high acid oil in esterification is95.43%by following optimum reaction conditions: molar ratio of methanol to oil was8:1, dosage of catalyst was1.4%(W/W), dosage of4A molecular sieve was40%(W/W), and reaction time was90min.②sing the copper sulfate as the reagent of removing water, the conversion rate of high acid oil in esterification is88.21%by following optimum reaction conditions: dosage of anhydrous copper sulfate was10%(W/W), molar ratio of methanol to oil was4:1,dosage of catalyst was3%(W/W), reaction temperature was75℃and reaction time was120min.③The results of the conversion rate of high acid oil through gas phase esterification is affected by the water content in methanol show that:the conversion rate is88.44%when the water content in methanol is7.25%, and the conversion rate was69.98%when the water content in methanol is9.0%, Accordingly, the critical water content in methanol that has a significant impact in circulating gaseous esterification reaction was7.25%.④sing the water content in methanol is9.0%, the conversion rate of high acid oil in circulating gaseous esterification reaction is90.28%by following optimum reaction conditions:dosage of anhydrous copper sulfate was40%(W/W), reaction temperature was80℃,dosage of catalyst was1.2%(W/W) and reaction time was90min.The research achievements of the paper provide the basic data for removing the water in methanol containing water timely in the process of high acid value oil esterification reducing the acid value, and provide a basis for the further application of technology.

Related Dissertations

  1. Study on the Preparation of Biodiesel from Fried Oil with Supercritical Methanol,TE667
  2. The Biodiesel Production from Wasted Edible Oil by Two Steps Catalyzed by Resin,TE667
  3. Study on the Preparation of Medical Grade Glycerol from the By-product of Jatropha Biodiesel,TQ223.163
  4. Preparation of Epichlorohydrin from Crude Glycerol of Biodiesel By-product,TQ223.26
  5. Biodiesel Production from Waste Oil and Study of Reduction of the Condensation Point,TE667
  6. Study on the Lubricity of Rape-seed Biodiesel and Its Blends with Diesel Oil,S232.6
  7. Study on Preparation of Biodiesel Catalyzed by Solid Base,TE667
  8. BP network optimization based on genetic algorithm optimization of the biodiesel process,TE667
  9. Research on Evaluation of Technology and Economy of Biodiesel Based on Life Cycle Assessment,TE667
  10. Epoxidation of olefins with high activity cobalt zeolite catalysts,O643.32
  11. Effects of Ph and Copper Sulfate on Nonspecific Immunity of Chinese Mitten Crab (Eriocheir Sinensis),S917.4
  12. Catalytic Transfer Hydrogenation of Biodiesel in Aqueous Media,TE667
  13. Preparation and Catalytic Activity of Magnetic Heteropolyacids Catalysts,TQ426
  14. Intensification on Hydrolysis and Esterification Precess by Hydrodynamic Cavitation Technology in Biodiesel Preparation,TE667
  15. Preparation of 1,2-propanediol from Crude Glycerol of Biodiesel Byproduct,TQ223.162
  16. Impact of Some Natural Antioxidants on the Oxidative Stability of Biodiesel,TE667
  17. Templated Synthesis of Surface Enhanced Raman Scattering Substrate and Its Application,O657.37
  18. Study on Composition and Combustion Performance of Biodiesel,TE667
  19. Catalytic Performance of Metal/TiO2 -SAPO-11 Catalyst for N-heptane Isomerization,O643.36
  20. Preparation and Expriment of Biodiesel with Pistacia Chinensis Seed Oil,TE667
  21. Study on the Preparation of Biodiesel from Jatropha Curcas Seeds Oil and the Extraction of Jatropha Curcas Seeds Protein,TE667

CLC: > Industrial Technology > Oil and gas industry > Oil, natural gas processing industry > Synthetic oil > Extraction of oil from other raw materials
© 2012 www.DissertationTopic.Net  Mobile