Catalyst for synthesizing 3-pentanone

Abstract

The invention relates to a catalyst for synthesizing 3-pentanone, and belongs to the technical field of preparation of catalysts for fine chemical products. The catalyst consists of an active composition, an auxiliary agent and a carrier, wherein the active composition is one or more of lanthanum rare earth oxide and actinium rare earth oxide; the carrier is one or more of zirconia, alumina, titania and silicon dioxide; the weight ratio of the active composition to the carrier is 5-80:95-20; and the auxiliary agent is one or more alkali metals or alkaline earth oxides and is 0.1 to 5 weight percent of the total weight of the active composition and the carrier. The catalyst not only maintains the activity of the prior catalyst, but also overcomes the defects of the prior rare earth catalyst, achieves the aims of inhibiting the isomerization reaction and reducing the content of 2-pentanone and methyl isopropyl ketone in the reaction products, and greatly reduces the separation difficulty of the 3-pentanone.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation for fine chemical products, in particular to a catalyst for synthesizing 3-pentanone. Background technique [0002] 3-Pentanone, also known as diethyl ketone, is a colorless transparent liquid with a melting point of -42°C, a boiling point of 101.7°C, a relative density of 0.8136, and a refractive index of 1.3927. It is soluble in ethanol and ether. In pesticides, it is used to synthesize the herbicide pendimethalin; in medicine, it is used to synthesize the anti-avian flu drug Tamiflu. [0003] The main synthesis methods of 3-pentanone are acid decarboxylation method, butanone methanol method and piperylene hydration isomerization method. [0004] Chinese invention patent 200610117483.9 discloses a kind of piperylene as raw material, with H 3 PO4 / diatomaceous earth is used as a catalyst to convert piperylene and water into pentanone in an adiabatic reactor. After the vaporized wat...

AI Technical Summary

Problems solved by technology

[0006] The common shortcoming of above-mentioned two synthetic routes is: when generating 3-pentanone, can be accompanied by the generation of a large amount of 2-pentanone or methyl isopropyl ketone

However, due to the isomerization reaction, there are still about 0.5% 2-pentanone and methyl isopropyl ketone in the reaction product, which is difficult to separate, thereby greatly affecting the quality of 3-pentanone

In 1990, BASF company disclosed the 2% K 2 O / TiO 2 It is a method for the synthesis of 3-pentanone from propionic acid as a catalyst. At 370°C, the conversion rate of propionic acid is 100%, and the selectivity of 3-pentanone is 99%. However, our research has found that the catalyst deactivates faster

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