2-propyl enanthaldehyde preparation method

Abstract

The preparation method of 2-propyl heptanal is characterized by that the valeric aldehyde condensation product 2-propyl-2-heptene aldehyde is contacted with Pd / Al2O3 or amorphous Ni-Cu-B / Al2O3 alloy catalyst bed layer in the two-stage series-connected fixed-bed reactor with reflux under the condition of liquid phase state to make staged selective hydrogenation reaction. The partial reaction product can be back flowed and continuously fed into reactor together with fresh raw material. The invented product is high in purity, and is economic and reasonable.

Description

technical field

[0001] The invention belongs to the field of synthetic fragrance or fine organic synthesis intermediate. The invention relates to a method for preparing compound 2-propylheptanal. 2-Propylheptanal can be used in the synthesis of perfumes or as a raw material for the production of organic intermediates such as 2-propylheptanoic acid. Background technique

[0002] 2-Propylheptanal is an isomer of decanal, and 2-propylheptanal is hardly available in nature. Regarding the preparation of 2-propylheptanal, in the published literature, no report on the preparation method of 2-propylheptanal has been found so far. USP4,018,831 (E.Bowes et al.) mentions the method of obtaining 2-ethylhexanal by partial hydrogenation of butyraldehyde condensation product 2-ethylhexenal. The method obtains higher conversion rate of 2-ethylhexenal and selectivity of 2-ethylhexanal by diluting raw materials.

[0003] USP5,463,147 (H.Bahrmann etc.) discloses a kind of butene-1 and / or b...

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