The catalytic oxidation of o-xylene PDF Download
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Author: Stuart Nigel Ellis
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Stuart Nigel Ellis
Publisher:
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Category :
Languages : en
Pages :
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Author: Graham Inglis Watt
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Richard Shih-Chun Chu
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 142
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"This investigation was conducted to further study the vapor-phase oxidation or o-xylene to phthalic anhydride in a fluidized bed catalytic reactor. Parameters investigated during the study were temperature, catalyst volume, and catalyst activated by use or different promoters. Two different vanadium pentoxide catalysts were used. One was a new catalyst(Catalyst I) supported on a silica base and diluted with potassium sulfate. The other catalyst(Catalyst II) was similar to the first one except that it had been used in a commercial fixed bed reactor operated by the Monsanto Company, St. Louis, Missouri, using naphthalene as a reed material. It had been suggested that this second catalyst would be "activated" whereas the fresh catalyst would not am the used catalyst would thus give higher yield or phthalic anhydride. Little difference in yield or phthalic anhydride was found, the used catalyst giving slightly lower yields. These studies were conducted on a laboratory scale in equipment similar to that used in earlier studies by Wang(12) but modified in several respects. Phthalic anhydride, maleic anhydride, o-toluic aldehyde, carbon dioxide and water were obtained as oxidation products. Except water, they are all determined by quantitative analysis. Two different amounts of Catalyst I (24 grams and 102 grams) were used at five different temperatures C320,400,450,490,520°C) to study the effect on the yield per cent or phthalic anhydride. It was found that the optimum reaction temperature is at 490°C when using either amount of catalyst. The highest yields of phthalic anhydride obtained were 21.5 per cent when using 24 grams of Catalyst I and 24.3 per cent when using 102 grams. The highest yield of phthalic anhydride was 19.6 per cent when 137 grams of Catalyst II were used at 490°C and the lowest yield was 9.6 per cent at 320°C. The effect of the addition of bromine, phenol bromide, and 1-3 dibromo-propane, as promoters, was also investigated. These promoters were introduced into the liquid o-xylene feed in separate tests. It was again found from a number of tests at different reactor temperatures that 490°C gave the highest yield of phthalic anhydride, 36.2 per cent. This yield was obtained using 5 per cent by volume of liquid bromine in the feed and 102 grams of Catalyst I"--Abstract, pages ii-iii.
Author: Graham Inglis Watt
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Ian Francis Boag
Publisher:
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Category : Experimental design
Languages : en
Pages : 472
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Author:
Publisher:
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Category : Catalysis
Languages : en
Pages : 480
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Author: Lloyd Caldwell
Publisher:
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Category :
Languages : en
Pages :
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Author: Adam Bielanski
Publisher: CRC Press
ISBN: 9780824783204
Category : Science
Languages : en
Pages : 496
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A description of catalytic systems commonly used as model systems in the laboratory and as industrial catalysts in large-scale operations, and a discussion of the mechanisms operating in these reactions. Attempts to describe the elementary steps by quantum chemical methods are also shown, as are rec
Author: Robert Marx
Publisher:
ISBN: 9783943917383
Category :
Languages : en
Pages : 177
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Author: Jyue-Sheng Wang
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 156
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"This investigation was conducted to study the vapor-phase oxidation of o-xylene to phthalic anhydride in a fluidized bed reactor. Parameters investigated during the study were temperature, molar ratio of air to o-xylene vapor, and space velocity. The catalyst used was vanadium pentoxide supported on a silica base and diluted with potassium sulfate. The studies were conducted on a laboratory scale"--Abstract, leaf ii.
