Dissertation
Dissertation > 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

Studies on Selective Catalytic Oxidation of Cresol to Hydroxybenzaldehyde

Author DongDaFei
Tutor XiaoRuTing
School Tianjin University of Technology
Course Chemical Engineering
Keywords Methylphenol Hydroxybenzaldehyde Catalytic Oxidation Titanium Series catalyst
CLC TQ244.1
Type Master's thesis
Year 2010
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Hydroxybenzaldehyde important chemical intermediates in organic synthesis process , which uses hydroxybenzaldehyde hydroxybenzaldehyde most widely used , they are widely used in medicine, pesticides , spices , food , electroplating, dyes , petroleum processing , LCD polymer materials , additives and other fields. Hydroxybenzaldehyde wide range of applications , the products of high added value , high demand , causing its price is higher , it is very necessary to further study and improve their production methods . Thesis methylphenol selection hydroxybenzaldehyde oxidation reaction was conducted further research, especially in alkaline solution under conditions , in the reaction of the supported catalyst and oxygen under the action of the selective oxidation of the methyl phenol -hydroxybenzaldehyde was prepared . The results showed that this selective oxidation of the cobalt supported copper catalyst has good catalytic activity . In this thesis, the cobalt , copper - based catalyst, the addition of a small amount of iron , cerium nitrate as auxiliaries , to TiO 2 for the carrier , using a supported catalyst prepared by impregnation . Methyl phenol selective oxidation synthesis hydroxybenzaldehyde evaluable for response , and the use of infrared detection ( IR ) , the catalysts were characterized by X - ray diffraction (XRD) technology , using high performance liquid chromatography (HPLC) analysis to detect the reaction results . Evaluation of the catalyst according to the detection result of the characterization results of the supported catalyst and HPLC analysis the influence of catalyst preparation conditions for the catalytic activity and filter out the optimal preparation of the catalyst condition . The results show that the group of the catalyst distribution ratio , the ignition temperature of the catalyst , the ignition time of the catalytic activity of the catalyst has a greater impact . This paper also the process conditions of the catalytic oxidation reaction in the reaction of p-hydroxybenzaldehyde was prepared in the oxidation of p-cresol , under optimal reaction conditions , the rate of up to 100% conversion of p-cresol , p selectivity of 95.2% of formaldehyde ; hydroxybenzaldehyde reaction between the oxidative preparation of m-cresol , under optimum conditions , the m-cresol conversion was 55.4% , the selectivity of the hydroxybenzaldehyde was 37.5% , this shows that this catalyst is not used for catalytic oxidation reaction of m-cresol .

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