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A method for preparing levoglucosan from agricultural and forestry waste

A technology of agricultural and forestry waste and levoglucosan, which is applied in the field of biomass energy utilization, can solve the problems of difficult recycling, low yield of levoglucosan, and high extraction cost, so as to increase yield and realize high-value utilization Effect

Active Publication Date: 2020-09-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using CO 2 The atmosphere replaces the traditional catalyst, the process is simple, the cost is low, and the problems of catalyst selection, deactivation, recovery difficulties, and corrosion of the reaction vessel are avoided, and the low yield of levoglucosan in bio-oil obtained by direct pyrolysis of biomass is overcome , high extraction costs and other defects, to achieve high-value utilization of agricultural and forestry waste

Method used

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  • A method for preparing levoglucosan from agricultural and forestry waste
  • A method for preparing levoglucosan from agricultural and forestry waste
  • A method for preparing levoglucosan from agricultural and forestry waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] S1: Weigh 10g of rice stalks and place them in a 500ml high-temperature and high-pressure hydrothermal reaction kettle, add 100ml of water, and fill with CO with an initial pressure of 2MPa. 2 , at CO 2 Under the atmosphere, the temperature was raised to 200°C at a rate of 8°C / min, and stayed for 30 minutes for hydrothermal pretreatment;

[0044] S2: After the reaction is completed, the reaction mixture is vacuum filtered and separated, and the obtained solid product is dried;

[0045] S3: CO is introduced into the fixed bed 2 As the pyrolysis carrier gas, the flow rate is set to 200ml / min. After the air in the reactor is exhausted, the dried hydrothermal coke is pyrolyzed at 360°C, and the volatile matter is condensed at 120°C to obtain a liquid product, which is analyzed by gas chromatography Wherein the content of levoglucosan.

[0046] Further, after the present embodiment is analyzed by gas chromatography, the results are as follows Figure 4 As shown, it is ca...

Embodiment 2

[0048] S1: Weigh 10g of rice straw and place it in a 500ml high-temperature and high-pressure hydrothermal reaction kettle, add 100ml of water, and fill it with CO with an initial pressure of 1.5MPa. 2 , at CO 2 Under the atmosphere, the temperature was raised to 200°C at a rate of 8°C / min, and stayed for 30 minutes for hydrothermal pretreatment;

[0049] S2: After the reaction is completed, the reaction mixture is vacuum filtered and separated, and the obtained solid product is dried;

[0050] S3: CO is introduced into the fixed bed 2 As the pyrolysis carrier gas, the flow rate is set to 200ml / min. After the air in the reactor is exhausted, the dried hydrothermal coke is pyrolyzed at 380°C, and the liquid product is obtained after condensing the volatile matter at 140°C. Analyze it by gas chromatography Levoglucosan content.

[0051] Further, after the present embodiment is analyzed by gas chromatography, the results are as follows Figure 5 As shown, it is calculated tha...

Embodiment 3

[0053] S1: Weigh 10g of rice stalks and place them in a 500ml high-temperature and high-pressure hydrothermal reaction kettle, add 100ml of water, and fill with CO with an initial pressure of 1MPa. 2 , at CO 2 Under the atmosphere, the temperature was raised to 200°C at a rate of 8°C / min, and stayed for 30 minutes for hydrothermal pretreatment;

[0054] S2: After the reaction is completed, the reaction mixture is vacuum filtered and separated, and the obtained solid product is dried;

[0055] S3: CO is introduced into the fixed bed 2 As the pyrolysis carrier gas, the flow rate is set to 200ml / min. After the air in the reactor is exhausted, the dried hydrothermal coke is pyrolyzed at 400°C, and the liquid product is obtained after condensing the volatile matter at 160°C. Analyze it by gas chromatography Levoglucosan content.

[0056] Further, in this example, after gas chromatography analysis, it is calculated that the relative content of levoglucosan is 28.11%, and the yiel...

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Abstract

The invention discloses a method for producing levoglucosan by using agricultural and forest waste. The method for producing the levoglucosan by using the agricultural and forest waste comprises the following steps of (1) adding the crushed agricultural and forest waste and water into a hydrothermal reaction kettle according to a mass volume ratio of (1 to 1) to (5 to 20); (2) filling the hydrothermal reaction kettle with CO2, sealing the hydrothermal reaction kettle to make the hydrothermal reaction kettle heated to 150-250 DEG C with stirring, and maintaining the temperature for 10-50 minutes; (3) cooling the hydrothermal reaction kettle, collecting a reaction product, and conducting vacuum filtration, separation and drying on the reaction product to obtain a solid product subjected to hydrothermal pre-treatment; (4) placing the solid product in a pyrolysis reactor to make the solid product subjected to pyrolysis in a CO2 atmosphere; and (5) obtaining a liquid product with a high levoglucosan concentration after conducting fractional condensation on the solid product. According to the method for producing the levoglucosan by using the agricultural and forest waste, hydrothermal pre-treatment under the CO2 atmosphere and pyrolysis under the CO2 atmosphere are combined to promote maximum conversion from the agricultural and forest waste to the levoglucosan, and the defect of alow yield of levoglucosan in bio-oil obtained by directly conducting pyrolysis on biomass is overcome.

Description

technical field [0001] The invention belongs to the technical field of utilization of biomass energy, and more specifically relates to a method for preparing levoglucosan from agricultural and forestry waste. Background technique [0002] Biomass pyrolysis generally refers to the thermochemical conversion process in which biomass is heated at high temperature under anaerobic or anoxic conditions, and its polymer structure depolymerizes to produce combustible gases, liquids and solids. Biomass pyrolysis process usually requires to increase the proportion of bio-oil in the pyrolysis product as much as possible. The properties and components of bio-oil obtained from different biomasses under different pyrolysis conditions vary greatly, some of which have high commercial value, and it is possible to enrich these products by optimizing the pyrolysis process. [0003] As a new sugar source with great potential, levoglucosan can be hydrolyzed into glucose by adding acid and used i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/02
Inventor 王贤华郑迪维娜陈应泉杨海平杨晴李佳硕曾阔胡俊豪陈汉平
Owner HUAZHONG UNIV OF SCI & TECH
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