Metal oxide coated ceramic corrugated plate catalyst, preparation and application of metal oxide coated ceramic corrugated plate catalyst in preparation of citral key intermediate

Abstract

The invention belongs to the technical field of catalysis, and particularly relates to a metal oxide coated ceramic corrugated plate catalyst, preparation and application of the metal oxide coated ceramic corrugated plate catalyst in preparation of citral key intermediates. The catalyst is composed of a ceramic corrugated plate carrier and a metal oxide active layer coated on the surface of the carrier, the metal oxide active layer is a metal oxide formed by an active component titanium and at least four other metal elements, and the metal elements are selected from vanadium, chromium, manganese, iron, zirconium, niobium and molybdenum. The invention provides thecatalyst suitable for continuous production of isopentenal or isopentenol, isopentenal or isopentenol is prepared by using the catalyst to catalyze a rearrangement reaction, the purity and yield of the product are high, the conversion rate of the raw materials is high, and the selectivity of the catalyst is good. The metal oxide coated ceramic corrugated plate catalyst provided by the invention integrates catalysis and separation functions, is high in stability, and can be directly used for continuous reactive distillation.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a metal oxide-coated ceramic corrugated plate catalyst, its preparation and its application in the preparation of key intermediates of citral. Background technique [0002] Citral is a terpene fatty aldehyde with a strong lemony aroma. Citral is an important fragrance intermediate, which can be used to manufacture citrus flavor food fragrances, or to synthesize other fragrances such as isopulegol, hydroxycitronellal and ionone. Important starting material for vitamin E and vitamin A. [0003] Citral occurs naturally in litsea cubeba oil and can be extracted by distillation under reduced pressure. However, limited by the source of raw materials and the efficiency of the production process, it does not meet the requirements of modern chemical mass production and cannot meet the needs of the market. Therefore, most of the citral on the market is chemically synthesiz...

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Problems solved by technology

[0010] At present, the route of producing prenol and prenal with acetone as raw material, followed by condensation and rearrangement to prepare citral has not yet been industrialized. The reason lies in the preparation of prenol or The conversion rate of prenaldehyde is low, the side reactions are difficult to control, there are many by-products, the price of the catalyst is high, it is difficult to recycle, and the consumption is large, etc.:

[0017] CN101381292B discloses a method for continuous production of prenaldehyde, using a composite catalyst composed of titanyl acetylacetonate, cuprous chloride and benzoic acid to realize the continuous production of methyl butynol to prenaldehyde through reactive distillation coupling technology The comprehensive yield reaches 88-93%, but the price of the catalyst is high and the recycling is difficult. The raw materials are kept in the tower kettle for a long time, and the dehydroxylation by-products of raw materials are not easy to control, resulting in many by-products in practical applications

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