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2-propyl enanthaldehyde preparation method

A kind of technology of propyl heptanal and propyl group, applied in the field of preparing compound 2-propyl heptanal, can solve the problems such as the preparation method of 2-propyl heptanal has not been found yet

Inactive Publication Date: 2003-03-26
SINOPEC JINLING PETROCHEMICAL CO LTD
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  • Abstract
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Problems solved by technology

About the preparation of 2-propyl heptanal, in the published literature, the report about the preparation method of 2-propyl heptanal has not been found so far

Method used

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  • 2-propyl enanthaldehyde preparation method

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Embodiment 1-3

[0014] The selective hydrogenation of 2-propyl-2-heptenal was carried out in a two-stage serial fixed-bed flow system with reflux as shown in the accompanying drawing. Before the reaction starts, the catalyst needs to be pre-reduced. At 200°C and under the reaction pressure, the catalyst is reduced with hydrogen flow for 12 hours, and then lowered to the reaction temperature. The selective hydrogenation reaction is carried out at a certain temperature and pressure, and the alkenal raw material is pumped from the upper end of the reactor at a certain flow rate, and the tail gas flow rate is controlled to determine the molar ratio of the hydrogen to the alkenal. After the system was stabilized, samples were collected and analyzed regularly.

[0015] Table 1 is the reaction conditions tested, LOOP1 is the first-stage reactor loop, and LOOP2 is the second-stage reactor loop. Wherein the space velocity is measured by the liquid hourly volumetric space velocity of fresh raw materia...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/52C07C47/02
Inventor 唐忠冯仰渝
Owner SINOPEC JINLING PETROCHEMICAL CO LTD
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