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Application Of UNIFAC Model To The Simulation Of Me-Ester Distillation

Posted on:2003-09-23Degree:MasterType:Thesis
Country:ChinaCandidate:M LiuFull Text:PDF
GTID:2121360125970210Subject:Chemical Engineering
Abstract/Summary:PDF Full Text Request
This paper iS mainly to simulate the process of Me—Ester pre—distillation andoptimize the performance of equipment of Me—Ester distillation by altering itsoperating parameter.The characteristic of the technologic process iS the complicatedmakeup,numerous components and the highly non-ideal system.The towers ofpre—distillation and distillation of Me—Ester are the typical separating equipments.Thisdissertation is mainly to simulate pre-distillation of Me—Ester by the stabilegrade-equilibrium model and optimize the distillation of Me—Ester by the dynamicUFG model and minimal heating charge model,after analyzing and demonstrating theequipment. It is very important to choose the reasonable sub—important component andcalculate the VLE during the simulation of Me—Ester distillation because of thecomplicated makeup,numerous components and the highly non-ideal system.Themethod of model molecule Was applied to evaluate the sub-important components andcombine or disconnect it by the volatility,molecular weight and density.Meanwhile,with regard to the key component,the model molecule of alkyrlation and formula ofLagrange were used to conforrn the components.The group contribution methods,based on the cross connection of UNIFAC model(original UNIFAC model,modifiedUNIFAC model(Dortmund),modified UNIFAC model(Lyngby),ASOG model)andthe state equation(SRK equation,PR equation,Van Ness equation),were applied topredict VLE of me.ester system.Compared with the located data,we founded thatmodel of SRK equation+modified UNIFAC model(Dortmund)may better depict thethermo-dynamics character of me-ester+di—clycerid system than others connection.By the analyze of predicted VLE data,the optimum temperature of operation Was205—213℃ in the distillation tower.The optimum operating temperature ofdistillation tower was adjusted to 210℃and the heating charge of distillation towerwas reduced by 19.1%by means of minimal heating charge model of flashes。...
Keywords/Search Tags:Me-ester-Di-clycerid, Vapor-liquid equilibria(VLE), system, UNIFAC model, State equation
PDF Full Text Request
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