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Gas - Liquid - Solid Three-phase Bed, One-step Synthesis Of Dimethyl Ether

Posted on:2006-06-30Degree:MasterType:Thesis
Country:ChinaCandidate:X Q ZhongFull Text:PDF
GTID:2191360155465268Subject:Applied Chemistry
Abstract/Summary:PDF Full Text Request
The characteristics and the applications of dimethyl ether(DME), the development of DME in home and broad were summarized in this thesis. To produce DME using plenty of CO in the tail gas of process of industry production have a widely developing prospect. The optimizing of technical condition and performance of bifunctional catalyst were investigated in a slurry bed reactor.(1)The performance and technical condition of four kind catalysts being used to synthesize methanol were studied in a three phase slurry bed reactor. At 3.0MPa of pressure, 240℃ of temperature, 1500n/min of rotate speed, 0.07L.min-1 of gas velocity of flow, 1:2 (mol) of CO to H2, the best synthesizing methanol catalyst — C301 was founded. The maximum convert rate of CO reached 68.63%, and the selectivity of methanol reached 91.68%.(2)Using C301 as the synthesizing methanol catalyst, and Hβ, HY HZSM-5 and γ — Al2O3 as the dehydration catalyst of methanol, the four bifunctional catalysts C301—Hβ, C301 —HY ,C301-HZSM-5 and C301 — γ— Al2O3 were made. And the effect factors were investigated on synthesizing dimethyl ether by one step using bifunctional catalyst in a three phase slurry bed, and the best bifunctional catalyst — C301—HY was founded. In optimum reaction condition, 280℃ of the temperature, 4.0MPa of pressure, the convert rate of CO reached 76.61%, the selectivity of DME reached 68.17%, and the yield of DME reached 52.23%.(3) Through optimizing the technical conditions(temperature and pressure) of preparing dimethyl ether using bifunctional catalyst C301—HY in a three phase slurry bed, the change rule of the convert rate of CO and the yield of dimethyl ether with temperature and pressure was gained. The effect of the methanol synthesis catalyst and the dehydration catalyst rate on reaction was also gained. And the optimizing technical conditions, 280℃ of temperature, 4.0MPa of pressure, 4:1 (mass) of the rate of methanol synthesis catalyst to the dehydration catalyst were founded.(4) The thermodynamics data in different temperature, such as equilibrium composing, the convert rate of CO, the selectivity and yield of DME, were all founded. By doing experiments in different temperature (270300°C ) , the change rule of the convert rate of CO and the yield of DME with reaction time was gained. In 280"C, 4.0MPa, the optimized reaction time was about lOOmin .
Keywords/Search Tags:CO, Syngas, Methanol, Dimethyl ether, Bifunctional catalyst
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