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Honeycomb metal ceramic bifunctional catalyst, application thereof and method for preparing hydroxycitronellal

A dual-functional catalyst and honeycomb metal technology, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, carbon-based compound preparation, etc., can solve the problem of large impact on product aroma quality, harsh operating conditions, Difficulties in industrial production and other problems, to achieve the effect of improving charge distribution and alkaline environment, increasing conversion rate, and improving catalytic oxidation performance of platinum group metals

Active Publication Date: 2021-03-12
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] So far, there are many reports about the preparation of hydroxycitronellal by dehydrogenation of hydroxycitronellol, but because the dehydrogenation reaction is a reversible reaction, the conversion rate of the dehydrogenation process reported at present is all below 97%, and it needs to be processed under high temperature and vacuum. The dehydrogenation is carried out under severe conditions, and the operating conditions are harsh, which brings certain difficulties to industrial production. At the same time, the dehydrogenation process is often accompanied by the formation of various dehydration by-products, which has a great impact on the aroma quality of the product.

Method used

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  • Honeycomb metal ceramic bifunctional catalyst, application thereof and method for preparing hydroxycitronellal
  • Honeycomb metal ceramic bifunctional catalyst, application thereof and method for preparing hydroxycitronellal
  • Honeycomb metal ceramic bifunctional catalyst, application thereof and method for preparing hydroxycitronellal

Examples

Experimental program
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Effect test

Embodiment 1

[0048]Preparation of honeycomb cermet bifunctional catalyst: mix hydroxyapatite, copper oxide powder, palladium powder, lanthanum oxide powder, polyethylene glycol (PEG4000) according to the ratio of 40:50:10:5:6, and ball mill evenly Spray granulation, extrusion molding, drying, and then vacuum liquid-phase sintering at 800°C, keep warm for 60 minutes and then cool to room temperature with the furnace to obtain a honeycomb cermet bifunctional catalyst with a specific surface area of ​​31.2m 2 / g, the pore volume is 0.23mL / g.

[0049] Preparation of hydroxycitronellal by dehydrogenation-oxidation reaction: Fill 100g of honeycomb cermet catalyst particles into a fixed bed, heat the fixed bed with heat transfer oil to a reaction temperature of 150°C, and adjust the pressure of the reaction system to 1.00 bar. Use a metering pump to inject hydroxycitronellol into the vaporization chamber at a flow rate of 8.3g / min for vaporization, nitrogen enters the vaporization chamber at a ra...

Embodiment 2-6

[0051] Carry out the preparation of catalyst and the preparation of hydroxycitronellal according to the step of embodiment 1, corresponding preparation parameter and reaction result are as shown in table 1 and 2, no dehydration by-product is generated in embodiment 2-6, high polymer<0.01 %.

[0052] Table 1 catalyst preparation conditions

[0053]

[0054] Note: in embodiment 2-6, polyethylene glycol is PEG4000, and polyvinyl alcohol is PVA4000

[0055] Table 2 dehydrogenation reaction conditions and results

[0056]

[0057] The life of the catalyst in Example 6 was inspected. The catalyst was continuously catalytically operated for 3500 hours in a fixed bed, and the conversion rate and selectivity of the catalytic reaction remained above 99.5%, without carbon deposition and deactivation.

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Abstract

The invention discloses a honeycomb metal ceramic bifunctional catalyst, application thereof and a method for preparing hydroxycitronellal. The catalyst is prepared by mixing hydroxyapatite, a catalytic active component 1, a catalytic active component 2, rare earth oxide powder and a pore-forming agent according to a certain ratio, and carrying out spray granulation, extrusion molding and vacuum sintering. The catalyst has the characteristics of good heat resistance, multiple pores, large specific surface area and the like, and meanwhile, dehydrogenation and oxidation reactions are coupled, sothat the dehydrogenation reaction continuously moves forwards, dehydration side reactions are avoided, and the reaction conversion rate and selectivity are improved. The reaction can be carried out under normal pressure, and high-temperature water vapor generated by oxidation can effectively remove carbon deposit on the surface of the catalyst, thereby reducing the generation of high polymers andeffectively prolonging the service life of the catalyst.

Description

technical field [0001] The invention belongs to the field of organic synthesis, and in particular relates to a honeycomb cermet bifunctional catalyst and a method for preparing hydroxycitronellal by dehydrogenating hydroxycitronellol. Background technique [0002] Hydroxycitronellal is an important synthetic fragrance, it is a colorless, viscous liquid with a sweet lily-of-the-valley-like aroma, it is a traditional and highly valuable synthetic fragrance, its fragrance is elegant and fresh , can interact with various fragrances of clear, sweet, fresh and quiet. It is the main ingredient in the preparation of lily-of-the-valley fragrances. It is mainly used in perfumes, cosmetics, food flavor enhancers, cleaning agents and other fields. [0003] At present, the production process of hydroxycitronellal mainly has two categories, one is to prepare hydroxycitronellal with citronellal as raw material through carbonyl protection, hydration, and carbonyl deprotection; the other is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/18B01J23/89B01J23/63B01J23/652B01J35/04B01J35/10B01J37/00B01J37/08C07C45/00C07C47/19
CPCB01J27/1806B01J23/894B01J23/63B01J23/6522B01J23/002B01J37/0018B01J37/0045C07C45/002B01J35/56B01J35/613B01J35/633C07C47/19Y02P20/584
Inventor 车传亮董菁张永振王中华黎源
Owner WANHUA CHEM GRP CO LTD
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