Investigation On Preparation Of Renewable Hydrocarbon Fuel From Saponificated Chinese Tallow Seed Oil By Microwave-assisted Decarboxylation

With the aggravated global warming tendency and the depletion of traditional fossil fuel, renewable energies and reproducible hydrocarbon fuels are in urgent requirement. Different to fossil fuel which is unrecyclable, biomass fuel is reproducible, and vegetable oil is the main raw materials to obtain biomass fuel.In this paper, hydrocarbon fuel is prepared by microwave-assisted decarboxylation of saponificated Chinese tallow seed oil, the pyrolysis liquid and solid products are analyzed by GC-MS and FT-IR method, the effects of polarity and saturated fatty acid contents on cracking products are investigated.First, the content of fatty acid in Chinese tallow seed oil range in12months and its properties are investigated. Results show that the properties of fatty acid in Chinese tallow seed oil have changed to a certain degree because of the oxidization during storage process.Potassium, sodium and lithium saponificated products of Chinese tallow seed oils are used to study the microwave-assisted decarboxylation process, the pyrolysis products are analyzed by GC-MS method, the hydrocarbon generation patterns by decarboxylation of different polarity of Chinese tallow seed oils are studied. Results show that potassium saponificated Chinese tallow seed oil has the fastest temperature rising velocity, this is because it has the highest polarity and the most efficient microwave absorption. By comparison of the pyrolysis liquids of potassium, sodium and lithium saponificated products of Chinese tallow seed oils, it is found that microwave-assisted pyrolysis of potassium saponificated Chinese tallow seed oil has the highest hydrocarbon yield, with yield higher than65%.Potassium saponificated Chinese tallow seed oil and stillingia oil are used to study the microwave-assisted decarboxylation process, the pyrolysis products are analyzed by GC-MS method, the hydrocarbon generation patterns by decarboxylation of potassium saponificated Chinese tallow seed oil containing higher content of saturated fatty acid and potassium saponificated stillingia oil containing lower content of saturated fatty acid are studied. Results show that the pyrolysis products of stillingia oil are mostly aromatic hydrocarbons. The liquid hydrocarbons yield from pyrolysis of Chinese tallow seed oil is over65%, and under50%from stillingia oil.The microwave-assisted decarboxylation of sodium saponificated Chinese tallow seed oil is studied. The effects of temperature on hydrocarbon generation patterns are studied. Results show that the optimum temperature to obtain hydrocarbon fuel is400℃.