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Separation Of2-methyl-1-propanol-water Azeotrope By Combined Process With Salt Extraction And Distillation

Posted on:2015-07-18Degree:MasterType:Thesis
Country:ChinaCandidate:F F HouFull Text:PDF
GTID:2181330422481043Subject:Chemical Engineering
Abstract/Summary:PDF Full Text Request
2-Methyl-1-propanol, as an important chemicals and solvents, is widely used inindustry. At atmospheric pressure,2-Methyl-1-propanol can partially miscible with waterand form an azeotrope, the azeotrope contains66.8%of2-Methyl-1-propanol (massfraction). We cannot obtain the high purity2-Methyl-1-propanol by simple distillation.Azeotropic distillation and extractive distillation are currently used in industry to separate2-Methyl-1-propanol-water mixture, which would consume a small amount of azeotropicentrainer and extractant, but need high energy consumption. Based on the mechanism ofthe effect of salt, salt effect extractive distillation method is used to separate2-Methyl-1-propanol-water Azeotrope system.The first part is the literature review, which mainly introducing the methods forseparating the azeotropic organics-water solution system which contain azeotropicdistillation, extractive distillation, salt effect distillation, membrane separation; themethods for separating the2-Methyl-1-propanol-water solution which contain catalyticreaction distillation, extractive reaction distillation; The introduction and application ofInorganic salt separation technology in all fields.The second part is the experiment research. By comparing the composition data of thetwo phases of the ethanol-water-inorganic salts from the literatures with those obtainedfrom our experiments, the salting-out agents (K2CO3and KF) are selected for separatingthe ethanol-water system. The determination of liquid-liquid equilibrium data for systemsof2-Methyl-1-propanol-water-KF,2-Methyl-1-propanol-water-K2CO3under differentconcentration of salting-out agents were experimentally determined, providing basic datafor processes design of separating2-Methyl-1-propanol-water mixtures by using salt effectseparation procedure.The third part is the mathematical model. The Pitzer electrolyte solution theory and theNRTL equation were adopted to obtain the liquid-liquid equilibrium thermodynamicsmodel for2-Methyl-1-propanol-water-KF,2-Methyl-1-propanol-water-K2CO3whichprovided theoretical and computational basis for separating2-Methyl-1-propanol-watermixtures by using salt effect separation procedure.The fourth part is the Industrial application research. The feasibility for separating2-Methyl-1-propanol-water mixtures by using the brine which is easily recovered andrecycled as salting-out agents was demonstrated. The operating conditions weredetermined and2-Methyl-1-propanol-water system was separated by using this researchresults. The energy consumption of salt extraction and distillation was compared withazeotropic distillation method.The fifth part is the conclusion. The experiment result shows that the effect ofpotassium carbonate and potassium fluoride used as salting-out agent to separate2- methyl-1-propanol-water system is significant; The calculation data of the Pitzer modeland NRTL equation theoretical coincide with the laboratory data well; through computersimulation of salt extraction and distillation coupling to separate2-methyl-1-propanol-water system,the energy consumption is reduced by50%compared with traditionaldistillation by using benzene as azeotropic entrainer, which is suitable for industrialproduction.
Keywords/Search Tags:2-Methyl-1-propanol-water, salt effect, liquid-liquid equilibrium, Pitzer model, NRTL equation
PDF Full Text Request
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