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Decomposition Kinetics Of Glucose In High Temperature Liquid Water

Posted on:2007-04-18Degree:MasterType:Thesis
Country:ChinaCandidate:L YuanFull Text:PDF
GTID:2121360212489030Subject:Biochemical Engineering
Abstract/Summary:PDF Full Text Request
Levulinic acid(LA) can be produced from biomass(cellulose , starch and so on) through the reaction path :biomass→hexose→5-hydromethylfurfural(5-HMF) →LA. Results of most research about the reaction path show that the third step (5-HMF→LA) is a crucial step and has substantial impact on the selectivity and yield of product. The experiments in this paper are designed to take advantage of the High Temperature Liquid Water (HTLW) which has the characters of good solubility, acid and basic catalytic effect, tunable state of reaction medium to study on the decomposition kinetics of glucose and 5-HMF catalyzed by organic acids in high temperature liquid water and the stability of LA in high temperature liquid water.Decomposition kinetics of glucose catalyzed by organic acids in HTLW is studied at temperatures from 453.15K to 493.15K and pressure of 10MPa.From the result, we could see that the decomposition reaction is slightly sped up with organic acid, but the yield of LA increased obviously especially with formic acid.Decomposition kinetics of glucose catalyzed by different amount of organic acids in high temperature liquid is studied at temperatures of 473.15K and pressure of 10MPa.The experiment result shows that the decomposition rate of glucose increases slightly and yield of LA increases obviously with the increase of formic acid.Decomposition kinetics of 5-HMF catalyzed by organic acids in high temperature liquid water is studied at temperatures from 453.15K to 533.15K and pressure of 10MPa.From the result, we could see that the decomposition reaction is sped up and the yield of LA increases with organic acids, the order is: formic acid>acetic acid>no catalyst.Stability of LA in high temperature liquid water is studied at temperature from 523.15K to 563.16K and pressure of 10MPa.The result showed that with the increasing time the conversion of LA can rise to about 26% after 32 hours ofreaction at 563.15K.All the experiment results show that, with the organic acid the acidity in HT-LW enhanced the conversion rates of Glucose to 5-HMF and 5-HMF to LA increase, especially for the later step, so the yield of LA increases.
Keywords/Search Tags:organic acid, high temperature liquid water, glucose, 5-hydromethylfu-rfural, decomposition, reaction kinetics, formic acid, acetic acid, levulinic acid, stability
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