Cottonseed Oil Biodiesel Pilot Study

Author use cottonseed oil as raw material to make the biodiesel in the sub-critical water and supercritical methanol. Cottonseed oil in the sub-critical first step in the preparation of cottonseed oil fatty acid in the water, and the second step the use of cottonseed oil fatty acid preparation derived from Supercritical Methanol in the preparation of fatty acid methyl ester, or biodiesel. Cottonseed oil fatty acid is made by cottonseed oil and water in the sub-critical first step,fatty acid methyl ester is made by cottonseed oil fatty acid and methanol in the Supercritical Methanol. In this paper, a detailed study on the single factor of material ratio, reaction temperature, reaction pressure and reaction time impacting in the preparation of biodiesel. The acid value and UPLC testing of the product of measured. The product are measured by the acid value of the product of measured and UPLC testing.The best conditions that the cottonseed oil hydrolysis in sub-critical water is temperature 290℃, oil-water volume ratio 1:4, reaction time 40min, which yields 96.69% of fatty acids. Reaction kinetics analysis shows that the reaction order of hydrolysis reaction is 1.15; activation energy is 108.63kJ/mol, and kinetics equation the most appropriate conditions of esterification are reaction temperature 290℃, reaction time 30min, volume ratio of to methanol 1:3. With the conditions of the test, the yields of fatty acids methyl ester is 98.89%. The adoption of UPLC of tine product testing, analysis of the impact of factors on the fatty acid and fatty acid methyl ester content. The results show that:Unsaturated fatty acid methyl ester such as methyl oleate (18:1), and poly-unsaturated fatty acid methyl esters such as linoleic acid methyl ester (18:2) at 280℃under supercritical methanol relative content began to lower.fatty acid methyl ester changes in high temperature. Fatty acid methyl ester can not increase by adding excess methanol. General fatty acid and methanol in volume ratio 1:3 is Suitable. The excessive reaction time growth can not increase the fatty acid methyl ester, because the production of fatty acid methyl ester will have other side effects.