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Hydrogenation catalyst and preparation method thereof, and method for preparing citronellal by citral hydrogenation

A hydrogenation catalyst and citral technology, applied in the field of hydrogenation, can solve the problems of cumbersome treatment, inconsistent with green chemistry, and many wastes

Active Publication Date: 2020-04-07
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process has a high yield of citronellal, it uses a large amount of alkaline additives and solvents, which has high requirements on equipment, and there are many three wastes, and the treatment is cumbersome, which obviously does not conform to the concept of green chemistry.

Method used

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  • Hydrogenation catalyst and preparation method thereof, and method for preparing citronellal by citral hydrogenation
  • Hydrogenation catalyst and preparation method thereof, and method for preparing citronellal by citral hydrogenation
  • Hydrogenation catalyst and preparation method thereof, and method for preparing citronellal by citral hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] L 3 preparation

[0049] Put 100g of rare earth element La in a reaction furnace for hydrogenation reaction, the reaction temperature is 250°C, the reaction pressure is 2Mpa (A), and the reaction time is 3h to obtain the rare earth hydride LaH 3 ;

[0050] Complex carrier preparation

[0051] Take 50g LaH 3 and 5g Fe 3 o 4 Put it in a mechanical ball mill, and carry out composite treatment at 50°C for 5 hours under 1bar (G) hydrogen atmosphere to obtain a composite carrier with a particle size of 0.05mm;

[0052] target catalyst preparation

[0053] 1) Dissolve 2.01g dichlorodiammine palladium in 10g water, fully dissolve and impregnate with 55g composite carrier to obtain a catalyst precursor;

[0054] 2) Reducing the catalyst precursor at 120°C for 4 hours in a hydrogen atmosphere to obtain a hydrogenation catalyst 2wt%Pd / 10wt%Fe 3 o 4 -LaH 3 .

[0055] Response Performance Evaluation

[0056] Add 2wt%Pd / 10wt%Fe successively in a 500ml hydrogenation reaction...

Embodiment 2

[0058] L 3 preparation

[0059] Put 100g of rare earth element La in a reaction furnace for hydrogenation reaction, the reaction temperature is 320°C, the reaction pressure is 4Mpa (A), and the reaction time is 7h to obtain the rare earth hydride LaH 3 ;

[0060] Complex carrier preparation

[0061] Take 50g LaH 3 and 7.5g Fe 3 o 4 Put it in a mechanical ball mill, and perform composite treatment at 60°C for 8 hours under 3bar (G) hydrogen atmosphere to obtain a composite carrier with a particle size of 0.06mm;

[0062] target catalyst preparation

[0063] 1) 3.01g dichlorodiammine palladium was dissolved in 10g water, fully dissolved and impregnated with 57.5g composite carrier to obtain a catalyst precursor;

[0064] 2) The catalyst precursor was reduced at 140°C for 8 hours in a hydrogen atmosphere to obtain a hydrogenation catalyst 3wt%Pd / 15wt%Fe 3 o 4 -LaH 3 .

[0065] Response Performance Evaluation

[0066] Add 3wt%Pd / 15wt%Fe successively in 500ml hydrogenat...

Embodiment 3

[0068] L 3 preparation

[0069] Put 100g of rare earth element La in a reaction furnace for hydrogenation reaction, the reaction temperature is 380°C, the reaction pressure is 6Mpa (A), and the reaction time is 12h to obtain the rare earth hydride LaH 3 ;

[0070] Complex carrier preparation

[0071] Take 50g LaH 3 and 10g Fe 3 o 4 Put it in a mechanical ball mill, and perform composite treatment at 70°C for 13 hours under a hydrogen atmosphere of 6bar (G) to obtain a composite carrier with a particle size of 0.07mm;

[0072] target catalyst preparation

[0073] 1) Dissolve 4.01g dichlorodiammine palladium in 10g water, fully dissolve and impregnate with 60g composite carrier to obtain a catalyst precursor;

[0074] 2) Reducing the catalyst precursor at 100°C for 4 hours in a hydrogen atmosphere to obtain a hydrogenation catalyst 4wt%Pd / 20wt%Fe 3 o 4 -LaH 3 .

[0075] Response Performance Evaluation

[0076] Add 4wt%Pd / 20wt%Fe successively in a 500ml hydrogenation ...

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Abstract

The invention discloses a hydrogenation catalyst and a preparation method thereof, and a method for preparing citronellal by citral hydrogenation. The hydrogenation catalyst comprises a rare earth hydride, a metal oxide and Pd. Under the action of the hydrogenation catalyst, preferably in the presence of an N-heterocyclic compound additive, citral is hydrogenated to prepare citronellal. The hydrogenation catalyst has the advantages of CO poisoning resistance and long service life, reduces the possibility that citral is subjected to aldehyde group decomposition to generate CO, inhibits the poisoning probability of the active component Pd, and has a good industrial prospect.

Description

Technical field [0001] The present invention relates to the field of hydrogenation, specifically to a hydrogenation catalyst, and more specifically to a catalyst and a method for preparing citronellal by hydrogenating citral. Background technique [0002] Citronellal is one of the main components of plant essential oils such as eucalyptus oil and citronella oil. As an important isolated spice, it has a strong, fresh, green citrus-like, slightly woody aroma and is widely used in the food, spice and cosmetics industries. Citronellal is widely used in food flavors to prepare citrus and cherry flavors, and is also used to prepare low-grade soap flavors. At the same time, citronellal is also an important intermediate in the synthesis of other spices, such as hydroxycitronellal, citronellol, menthol and other spices. [0003] There are two sources of citronellal: natural extraction and chemical synthesis. Among them, naturally extracted citronellal is subject to changes in natu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/12B01J31/28B01J33/00C07C45/62C07C47/21
CPCB01J31/121B01J31/28B01J33/00C07C45/62B01J2231/645C07C47/21Y02P20/584
Inventor 王联防董菁张永振黎源于斌成刘照
Owner WANHUA CHEM GRP CO LTD
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