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Selective Oxidation of Propane to Maleic Anhydride and Acetic Acid

Author: TangJie
Tutor: ZhouXiaoPing
School: Hunan University
Course: Chemical processes
Keywords: Propane Selective oxidation Maleic anhydride Acetic acid Catalyst
CLC: O623.6
Type: Master's thesis
Year: 2006
Downloads: 55
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Abstract


Recovery in natural gas and oil in the refining process, a lot of propane, it is a byproduct of natural gas chemical and petrochemical. Propane having a high chemical stability, in the general case, with acid, alkali and common oxidizing agent, a reducing agent will not react. Therefore, propane has not been widely used in modern synthetic chemistry. Today, propane only as fuel directly consumed. Therefore, the conversion of propane to oxygenated compounds of olefins and hydrocarbons having a high added value in the economic and environmental significance. We discovered a new catalytic oxidation reaction of propane oxidation reaction. The VMoO catalyst and a dopant other metals VMoO to the catalysis of the catalyst, propane can be efficiently converted to the maleic anhydride and acetic acid. We prepared and tested a series of metal oxide catalyst, 70% Mo20% V10% AgO found that the catalyst has high activity for the selective oxidation of propane: the reaction at 300 ° C and atmospheric pressure, molecular oxygen as the oxidant, propane Way maleic anhydride selectivity for the conversion rate of 37.4%, generated 53.6% acetic acid selectivity of 38.9%, at the same time there will be a small amount of byproducts CO_x and acrylic generated. The selective oxidation reaction of propane is in a fixed bed continuous flow reactor, the reaction is carried out at atmospheric pressure and at 280 to 360 ° C, the ratio of a certain amount of propane, and oxygen on the catalyst to an oxidation reaction. The work of this study, a detailed study of the oxidation reaction of propane and oxygen ratio and reaction temperature. Also a lot of research work on the preparation of the catalyst at the same time, three different types of catalyst preparation method, and the experimental results of comparison, to obtain the optimum catalyst preparation method, by changing the kind of the metal element in the catalyst, and catalyst ratio to obtain a optimal. After the study found that maleic anhydride is a major product of the selective oxidation of propane. Now reported in the propane oxidation reaction product is typically in the study of the mechanism of the selective oxidation reaction of propane, propylene, acrylic acid and acrolein, we found that the carbon-carbon bond cleavage and recombination reaction is a critical step of the oxidation reaction. This reaction provides a propane selective oxidation to maleic anhydride and acetic acid with a high value, the prospects for industrial application.

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Aliphatic compounds ( acyclic compounds) > Aliphatic carboxylic acid and its derivatives
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