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Catalyst and method for preparing nerol and geraniol by using same

A catalyst, nerol technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problem that reactivity, selectivity and stability cannot be taken into account at the same time, increase separation difficulty, and complex preparation process, etc. problems, to achieve the effect of improving conversion rate and selectivity, good industrialization prospects, and simple reaction process

Active Publication Date: 2019-04-16
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technique has a higher target product yield, there are still two deficiencies: (1) contain a certain amount of by-product citronellol and nerol isomers in the product, and the boiling point of these two by-products Fall between nerol and geraniol, which will increase the difficulty of separation in the product rectification separation process in the later stage, and then increase the cost of equipment; (2) need to use organic bases such as trimethylamine in the process, And its amount is 1 to 5% by weight of the amount of carbonyl compound used
However, the preparation method of this technical solution has problems such as complex preparation process, relatively harsh operating conditions, and difficult separation of products, especially its reactivity, selectivity and stability cannot be taken into account at the same time.

Method used

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  • Catalyst and method for preparing nerol and geraniol by using same
  • Catalyst and method for preparing nerol and geraniol by using same
  • Catalyst and method for preparing nerol and geraniol by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 1.507g of chitosan was dissolved in 90ml of 1.5% aqueous acetic acid solution, heated and stirred until completely dissolved; a chitosan solution was obtained.

[0061] 0.49 g of zirconium dioxide was dispersed in 61.3 ml of deionized water in the flask. After fully stirring with the chitosan solution, add 1g of chloroplatinic acid hexahydrate, 0.459g of nickel chloride hexahydrate and 3.767g of PVP and stir at room temperature until completely dissolved. Then add 0.584g of sodium borohydride, and stir the reaction at room temperature for 4h. The reacted solution was centrifuged, washed with deionized water until neutral, and dried at 120° C. for 12 hours to obtain a catalyst.

[0062] During the catalyst preparation process, the mass ratio of chitosan to platinum is 4:1, the molar ratio of platinum to nickel is 1:1; the mass ratio of PVP to platinum is 10:1; the loading mass of zirconia is 50% (Based on the total mass of platinum, nickel and zirconium dioxide in the ...

Embodiment 2

[0064] 2.26g of chitosan was dissolved in 135.6ml of 1.5% aqueous acetic acid solution, heated and stirred until completely dissolved; a chitosan solution was obtained.

[0065] 0.5643 g of zirconium dioxide was dispersed in 62.7 ml of deionized water in a flask. After fully stirring with the chitosan solution, add 1g of chloroplatinic acid hexahydrate, 0.344g of nickel chloride hexahydrate and 4.144g of PVP and stir at room temperature until completely dissolved. Then add 0.657g of sodium borohydride, and stir the reaction at room temperature for 5h. The reacted solution was centrifuged, washed with deionized water until neutral, and dried at 130° C. for 15 hours to obtain a catalyst.

[0066] During the catalyst preparation process, the mass ratio of chitosan to platinum is 6:1, the molar ratio of platinum to nickel is 4:3; the mass ratio of PVP to platinum is 11:1; the loading mass of zirconia is 55% (Based on the total mass of platinum element, nickel element and zirconi...

Embodiment 3

[0068] 1.507g of chitosan was dissolved in 90ml of 1.5% aqueous acetic acid solution, heated and stirred until completely dissolved; a chitosan solution was obtained.

[0069] 0.65 g of zirconium dioxide was dispersed in 65 ml of deionized water in a flask. After fully stirring with the chitosan solution, add 1g of chloroplatinic acid hexahydrate, 0.248g of nickel acetylacetonate and 4.52g of PVP at room temperature and stir until fully dissolved. Then add 0.73g of sodium borohydride, and stir the reaction at room temperature for 6h. The reacted solution was centrifuged, washed with deionized water until neutral, and dried at 110° C. for 18 hours to obtain a catalyst.

[0070] During the preparation of the catalyst, the mass ratio of chitosan to platinum is 4:1, the molar ratio of platinum to nickel is 2:1; the mass ratio of PVP to platinum is 12:1; the loading mass of zirconia is 60 % (based on the total mass of platinum, nickel and zirconium dioxide in the raw materials us...

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Abstract

The invention provides a catalyst and a method for preparing nerol and geraniol by using the same. By utilizing the method, a reaction can be carried out under mild conditions, the nerol and the geraniol can be prepared with high yield under the catalysis of the catalyst, and the method has the advantages of simple reaction process, low reaction cost, environmental friendliness and the like. According to the preparation method of the catalyst, zirconium dioxide is used as a carrier, and chitosan, platinum metal precursors and nickel metal precursors are loaded on the zirconium dioxide to prepare the catalyst; preferably, the mass ratio of the amount of the chitosan to the amount of the platinum metal precursors in terms of the platinum element is 0.1-10:1, preferably 4-6:1; the molar ratioof the platinum metal precursors in terms of the platinum element to the nickel metal precursors in terms of the nickel element is from 1:3-3:1, preferably from 1:1-2:1.

Description

technical field [0001] The invention belongs to the field of preparation of nerol and geraniol, in particular to a method for preparing nerol and geraniol by heterogeneous catalytic hydrogenation of citral. Background technique [0002] Citral (structural formula shown below) is a typical α,β-unsaturated aldehyde, and its selective hydrogenation product is a mixture of geraniol and nerol. Geraniol and nerol (the structural formula is shown below), have a mild sweet smell and a rose fragrance, and are widely used in the deployment of various floral flavors. It is widely used in flavor, medicine and other industries. [0003] [0004] The difficulty in preparing geraniol by hydrogenation of citral is that there are two C=C and one C=O double bonds in the citral molecule, and the C=C double bond in the middle and the C=O at the end have the same Conjugation, hydrogen is only added to the C=O double bond but not to the C=C double bond (more difficult). Therefore, designing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28C07C33/02C07C29/141
CPCB01J31/28C07C29/141C07C33/02
Inventor 王亚新王联防董菁李文滨迟森森王文李晶
Owner WANHUA CHEM GRP CO LTD
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