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The Research on the Vapo Rphase Oxidation of Toluene to Benzaldehyde

Author: LiAn
Tutor: ZuoZiSheng
School: Hunan University
Course: Chemical Engineering and Technology
Keywords: toluene vapor phase oxidation benzaldehyde ZSM-5zeolite Manganese oxide octahedral molecular sieve titanium dioxide
CLC: TQ244.1
Type: Master's thesis
Year: 2013
Downloads: 8
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Abstract


Benzaldehyde is important intermediates in the organic synthesis industry and is also an important one of the aromatic aldehyde. It is mainly used in the field of dyes, medicine, pesticides, food, fuel, spices, cosmetics and organic polymer synthesis, which have the superiority of annual demand, market prospects and economic benefits. At present, The leading production technology in the industrial production is the alkyl chlorination of toluene, but the negative factors are the low selectivity, serious equipment corrosion, complex process and the environmental pollution. However, due to some chlorides included among products, it prevents product-benzaldehyde from further usage in the line of pharmaceutics and flavor, With the increasing demand of benzaldehyde, new processes need be developed to satisfy the processes demand. In this thesis, on the basis of extensive literature research, my experimental program of the subject is the vapor oxidation of toluene to benzaldehyde with the high temperature and the presence of solid catalyst.In this paper, through the reaction of the vapor phase oxidation of toluene to benzaldehyde over a series of the microporous ZSM-5, K-OMS-2and TiO2catalysts, we investigated the influence of the different preparation method of the catalyst material and reaction conditions, and optimized the reaction technology. The experimental results were listed as follows:(1) The vapor phase oxidation toluene to benzaldehyde over a series of ZSM-5catalystsA series of Ce/ZSM-5catalysts obtained by different preparation methods were characterized by XRD, FT-IR, N2-physical adsorption and so on. The catalysts performance effects modified by different metal ions, different preparation methods, metal load capability, reaction temperature, space velocity and feed ratio of air toluene. The experimental results showed that:the highest conversion of toluene and selectivity of benzaldehyde reached10.78%and5.05%on Ce/ZSM-5, which is10%Ce metal load capability.(2) The vapor phase oxidation toluene to benzaldehyde over a series of K-OMS-2catalystsManganese oxide octahedral molecular sieve catalyst was prepared by the different methods of the solid-phase method, the reflux method and the hydrothermal crystallization method, and OMS-2was prepared by impregnation method, homogeneous precipitation method and ion exchange method. A series of OMS-2catalysts obtained by different preparation methods were characterized by XRD, FT-IR, N2-physical adsorption and so on. The catalysts performance effects modified by different metal ions, different preparation methods, metal load capability, reaction temperature, space velocity and the feed ratio of air toluene were evaluated. The experimental results showed that:the OMS-2prepared by hydrothermal crystallization method show better catalytic performance. The yield and selectivity of benzaldehyde reached4.16%and81.30%on K-OMS-2, and the catalyst Exhibited better catalyst reaction stability and the ability of resistance to carbon deposition.(3) The vapor phase oxidation toluene to benzaldehyde over a series of TiO2catalystsA series of TiO2catalysts obtained by impregnation method were characterized by FT-IR, N2-physical adsorption and so on. The catalysts performance effects modified by different single metal ions, different double metal ions, different negative ion,metal load capability, reaction temperature, space velocity and the feed ratio of air toluene. The experimental results showed that:when the reaction condition is350℃space velocity of2500h-1and n(air):n(toluene)=5:1, the catalysts of5%PO43-/VTiO2performed better catalytic performance in the gas-phase catalytic oxidation of toluene, toluene conversion was12.00%, benzaldehyde selectivity and yield were73.75%and8.85%.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aromatic compounds > Aromatic aldehydes,aromatic ketones and their derivatives,quinones and their derivatives > Aromatic aldehydes and their derivatives
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