A method of catalytic oxygen decomposition of lignin to prepare extract containing vanillin and syringaldehyde

A technology for lignin and vanillin, which is applied in the field of catalytic oxygenolysis of lignin to prepare extracts containing vanillin and syringaldehyde, can solve the problems of harsh reaction conditions of strong acid and strong alkali, low yield of target products, corrosive environment of equipment and the like, Achieve the effect of low price, stable hydrothermal performance and easy oxidative depolymerization

Active Publication Date: 2022-03-11
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are still obvious deficiencies: one is that the reaction conditions of strong acid and strong alkali are relatively harsh, which is easy to cause corrosion of equipment and is not friendly to the environment; the other is that the yield of target product is low

Method used

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  • A method of catalytic oxygen decomposition of lignin to prepare extract containing vanillin and syringaldehyde
  • A method of catalytic oxygen decomposition of lignin to prepare extract containing vanillin and syringaldehyde
  • A method of catalytic oxygen decomposition of lignin to prepare extract containing vanillin and syringaldehyde

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0046] Step 1, the preprocessing method is:

[0047] 1.1 Add corn stalk lignin with 5% NaHCO at a solid-to-liquid ratio of 1:10 3 In the aqueous solution, stir at room temperature for 6 hours to obtain a sample of corn stalk lignin;

[0048] 1.2 Suction filter the sample in 1.1 above, and rinse the filter residue with deionized water for 3 times;

[0049] 1.3 Dry the sample obtained in the above 1.2 in an oven, the drying temperature is 80°C, and the drying time is 12 hours;

[0050] Step 2, pretreated 0.2g of corn stover lignin and 0.02g of perovskite catalyst CeCoO 3 , CeCuO 3 , CeFeO 3 , CeNiO 3 One of them is placed in a reaction kettle, and 20ml of ethanol / water mixed solvent is added, and the volume ratio of ethanol and water in the mixed solvent is 1:1; the reaction kettle is filled with nitrogen to 1MPa, and then exhausted, and repeated three times Complete the purging process; then feed oxygen into the reactor to 0.6MPa; set the reaction temperature to 180°C and...

example 2

[0053] Step 1, the preprocessing method is:

[0054] 1.1 Add corn stalk lignin with 5% NaHCO at a solid-to-liquid ratio of 1:10 3 In the aqueous solution, stir at room temperature for 6 hours to obtain a sample of corn stalk lignin;

[0055] 1.2 Suction filter the sample in 1.1 above, and rinse the filter residue with deionized water for 3 times;

[0056] 1.3 Dry the sample obtained in the above 1.2 in an oven, the drying temperature is 80°C, and the drying time is 12 hours;

[0057] Step 2, pretreated 0.2g of corn stover lignin and 0.02g of perovskite catalyst CeCoO 3 Placed in the reaction kettle, the volume ratio of ethanol and water in the mixed solvent is 1:1; fill the reaction kettle with nitrogen to 1MPa, then exhaust, repeat three times to complete the purging process; then pass into the reaction kettle Oxygen to 0.6MPa; set the reaction temperature to 120°C, and the reaction time to 60 minutes; after the reaction, place the reaction kettle in a mixture of ice and w...

example 3

[0060] Step 1, the preprocessing method is:

[0061] 1.1 Add corn stalk lignin with 5% NaHCO at a solid-to-liquid ratio of 1:10 3 In the aqueous solution, stir at room temperature for 6 hours to obtain a sample of corn stalk lignin;

[0062] 1.2 Suction filter the sample in 1.1 above, and rinse the filter residue with deionized water for 3 times;

[0063] 1.3 Dry the sample obtained in the above 1.2 in an oven, the drying temperature is 80°C, and the drying time is 12 hours;

[0064] Step 2, pretreated 0.2g of corn stover lignin and 0.02g of perovskite catalyst CeCoO 3 Put it in the reaction kettle, add 20ml of ethanol / water mixed solvent, the volume ratio of ethanol and water in the mixed solvent is 1:1; fill the reaction kettle with nitrogen to 1MPa, then exhaust, repeat three times to complete the purging process ; Next, feed oxygen into the reactor to 0.6MPa; set the reaction temperature to 150°C, and the reaction time to 60 minutes. After the reaction, place the reacto...

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Abstract

The invention relates to a method for preparing an extract containing vanillin and syringaldehyde by catalyzing oxygen decomposition of lignin, comprising step 1: adding corn stalk lignin to NaHCO 3 Pretreatment in aqueous solution; Step 2: Put the corn stalk lignin and perovskite catalyst pretreated in Step 1 in a closed reaction kettle, use ethanol / water mixed solution as solvent, and pass O 2 Carry out the reaction, and after the reaction, cool the reaction liquid to normal temperature and discharge; step 3: filter, rotary steam, and extract the discharge in step 2 in sequence, so as to obtain an extract containing vanillin and syringone. The reaction conditions of the present invention are mild, and have no pollution to the environment, can realize high-value utilization of biomass, and have great significance for protecting the ecological environment.

Description

technical field [0001] The invention relates to the technical field of lignin utilization, in particular to a method for preparing an extract containing vanillin and syringaldehyde by catalyzing oxygen decomposition of lignin. Background technique [0002] With the depletion of fossil energy, it is imminent to find new renewable alternatives to fossil energy. Biomass energy reserves are huge, clean and harmless, and have great potential to replace fossil energy. Biomass is mainly divided into three categories: cellulose, hemicellulose, and lignin. Among them, although lignin has a complex structure and is amorphous, it is the only renewable source of benzene rings in nature. In my country, a huge amount of lignin is produced in the papermaking and wood hydrolysis industries. Due to the complex physical and chemical properties of lignin, about 95% of lignin cannot be used for high-value utilization, but is directly discharged into rivers, resulting in Huge environmental pollu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C47/58C07C47/575C07C45/51C07C45/80B01J23/83
Inventor 沈德魁王瑾芝程崇博迂文兵
Owner SOUTHEAST UNIV
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