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A method for catalytically synthesizing tea aroma ketones by using perovskite composite oxides

A composite oxide and perovskite technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, and the preparation of organic compounds, can solve the problem of low catalyst activity selectivity and difficult separation of catalysts Apply mechanically, the catalytic effect is not ideal, etc., to achieve the effects of reducing energy consumption costs, easy separation, and maintaining catalytic activity

Active Publication Date: 2020-06-05
SHANDONG NHU VITAMIN CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] In summary, the existing research on the preparation of KIP by direct oxidation of α-IP, the catalytic effect is generally not ideal, some reaction conditions are harsh, some catalysts have low selectivity, some catalysts are not easy to separate and apply A lot of solvents, some oxidizing agents are expensive
Therefore, there is no mild reaction condition, high catalyst performance, long service life, easy separation, cheap oxidant, environment-friendly, solvent-free, and continuous direct oxidation of α-IP to prepare KIP.

Method used

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  • A method for catalytically synthesizing tea aroma ketones by using perovskite composite oxides
  • A method for catalytically synthesizing tea aroma ketones by using perovskite composite oxides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Catalyst preparation: according to the stoichiometric molar ratio La:K:Co:Mn=9:1:9:1, weigh a certain amount of lanthanum nitrate, potassium nitrate, cobalt nitrate and manganese nitrate, and then molar ratio metal cation: citric acid =1:1.1 Weigh an appropriate amount of citric acid, add it into distilled water, and use ultrasonic vibration to promote its dissolution, stir and evaporate to dryness in a water bath at 80°C to a sol state, place it in an oven to dry at 120°C, and then put The sample was calcined at 700°C for 3 hours to obtain the perovskite composite oxide catalyst La 0.9 K 0.1 co 0.9 mn 0.1 o 3+δ , denoted as catalyst A.

Embodiment 2

[0052] Preparation of the catalyst: according to the stoichiometric molar ratio La: Ca: Co: Fe = 1:1:1:1, weigh a certain amount of lanthanum nitrate, calcium nitrate, cobalt nitrate and ferric chloride, and then molar ratio metal cation: lemon Acid=1:1.1 Weigh an appropriate amount of citric acid, add it into distilled water, and use ultrasonic vibration to promote its dissolution, stir and evaporate to dryness in a water bath at 80°C to a sol state, place it in an oven to dry at 120°C, and then The sample was calcined at 700°C for 3 hours to obtain the perovskite composite oxide catalyst La 0.5 Ca 0.5 co 0.5 Fe 0.5 o 3+δ , denoted as catalyst B.

Embodiment 3

[0054] Catalyst preparation: weigh a certain amount of lanthanum acetate, strontium nitrate, cobalt chloride and copper sulfate according to the stoichiometric molar ratio La:Sr:Co:Cu=9:1:5:5, and then molar ratio metal cation: lemon Acid=1:1.1 Weigh an appropriate amount of citric acid, add it into distilled water, and use ultrasonic vibration to promote its dissolution, stir and evaporate to dryness in a water bath at 80°C to a sol state, place it in an oven to dry at 120°C, and then The sample was calcined at 700°C for 3 hours to obtain the perovskite composite oxide catalyst La 0.9 Sr 0.1 co 0.5 Cu 0.5 o 3+δ , denoted as catalyst C.

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Abstract

The invention discloses a method for catalyzing and synthesizing tea aroma ketone by using perovskite-type composite oxides. The method uses α-isophorone as a raw material and uses perovskite-type composite oxides as a catalyst under solvent-free conditions , with molecular oxygen or air as the oxidant, the tea aroma ketone was synthesized by continuous oxidation reaction in a trickle bed reactor. The invention has mild reaction conditions, high catalytic efficiency, good selectivity, high catalyst stability and is suitable for industrialized production.

Description

technical field [0001] The invention belongs to the technical field of organic chemical industry, and relates to a method for catalytically synthesizing tea aroma ketone by using a perovskite type composite oxide. Background technique [0002] Tea aroma ketone, also known as 4-oxoisophorone (KIP for short), is a light yellow liquid or crystal, and is a natural compound existing in various plants. Its pure product has a strong aroma and a long-lasting fragrance. The aroma is slightly sour and honey-sweet woody and dried fruit, and it has a significant flavoring effect on various cigarettes. Tea aroma ketone is an important chemical and pharmaceutical intermediate, which can be used as a flavoring agent or spice in food additives, and can also be used to synthesize cosmetics. It is also an important intermediate for the preparation of vitamins and carotenoids, and has a wide range of uses. [0003] At present, there are two main synthetic routes of KIP: oxidation β-isophorone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J23/889B01J23/89C07C45/34C07C49/603
CPCB01J23/002B01J23/83B01J23/8892B01J23/8946B01J2523/00C07C45/34C07C2601/16B01J2523/13B01J2523/3706B01J2523/72B01J2523/845B01J2523/23B01J2523/842B01J2523/17B01J2523/24B01J2523/25B01J2523/821B01J2523/822C07C49/603
Inventor 乔胜超张玉霞潘洪严宏岳毛建拥韦良胡鹏翔胡柏剡
Owner SHANDONG NHU VITAMIN CO LTD
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