Method for synthesizing isobutyraldehyde catalyst by using methyl alcohol and ethanol in one step

Abstract

A method for synthesizing an isobutyraldehyde catalyst by using methyl alcohol and ethanol in one step relates to a preparation method for the catalyst. The preparation method comprises the following steps of: dissolving a solubility vanadic salt and ferric salt in an aqueous solution, adding citric acid and one or two soluble salts of Ce, Zr and La, then stirring and evaporating a solvent, drying, molding and roasting after solvent evaporation is ended, and preparing the oxide catalyst, wherein the charging manner of a V salt solution and citric acid, Fe, Ce, Zr, La solutions is a positive addition method, a reverse addition method or a combining addition method, the evaporation temperature of the solvent is 30-95 DEG C, V is an active component, Fe, Ce, Zr and La are auxiliaries, a V metal salt is a vanadium soluble salt, and Fe, Ce, Zr and La salts are corresponding nitrates, the drying temperature is 80-150 DEG C, and the roasting temperature is 350-800 DEG C. The prepared product prepared by the method comprises main products such as high value-added acetaldehyde and propionaldehyde apart from isobutyraldehyde and few other by-products; and the catalyst has good stability, high activity and high selectivity.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method and use of a catalyst for one-step synthesis of isobutyraldehyde from methanol-ethanol. Background technique [0002] Isobutyraldehyde (IBA) and its derivatives isobutanol, methacrylic acid, neopentyl glycol, isobutylene, etc. are important organic chemical raw materials and fine chemical raw materials. Has a very wide range of uses. At present, isobutyraldehyde is mainly derived from propylene and synthesis gas (CO / H 2 ) Carbonylation reaction to produce n-butyraldehyde by-product. Because this process uses precious petroleum resources as raw materials, the reaction pressure is high, product separation is difficult, energy consumption is large, and isobutyraldehyde is only a by-product, the output is very small, it is difficult to meet the growing market demand, which seriously limits the production capacity of isobutyraldehyde. The development of b...

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Problems solved by technology

Since V 2 o 5 / TiO 2 -SiO 2 The catalyst has more suitable acidity and alkalinity and high V 2 o 5 Dispersion, showing better catalytic performance, at V 2 o 5 (wt%) content of 20%, the reaction temperature is 350 °C, the ethanol conversion rate reaches 92%, isobutyraldehyde selectivity is ~80%, but the stability of the catalyst is very poor

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