| Summary: | 碩士 === 中原大學 === 化學工程研究所 === 97 === Abstract
To improve the traditional process of biodiesel and continuously obtain biodiesel of high purity, a membrane reactor for the biodiesel system is studied. In membrane separation, the status of compositions in the two liquid phases should be considered to screen out most of the unreacted oil and get the FAME product of high purity.The phases change affects reaction and separation greatly. We used experiment and UNIQUAC model to study that the phases change for transesterification. We proposed a concept of integrated pre-reactors and tubular membrane to improve low conversion ration of membrane reactor caused by uneven stirring. We establish a model of tubular membrane separators for biodiesel and use this model to discuss change of component in feed-side and permeate-side and thus illustrating the role of membrane is mainly in separation. The pre-reactors can be PFR or CSTR. Simulation results shows when CSTR is used as pre-reactor, the conversion ratio is raised significantly. By simulating this system flux and selectivity is investigated. At temperature 60℃,catalytic concentration is 0.05wt.%, CSTR as pre-reactors, pre-reactors and membrane separators volume ratio of 50, operating time of 70 minutes and residence time of 10 minutes, we obtained a good flux and selectively from simulated result. Simulation reveals same trend as experimental result. In the experiment no TG and DG were present in permeate side, but slight amount of MG was found.
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