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Method for improving quality of pyrolytic oil by pretreating biomass raw material by using freeze-thaw assisted low cosolvent and application of method

A technology for pretreatment of biomass and biomass raw materials, which is used in the preparation of liquid hydrocarbon mixtures, petroleum industry, special forms of dry distillation, etc., to achieve the effects of enrichment, simple operation and improvement of pyrolysis oil quality

Active Publication Date: 2022-07-29
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] But so far, freeze-thaw pretreatment as a physical auxiliary method to improve the pretreatment effect of deep eutectic agent, thereby improving the quality of bagasse-derived pyrolysis oil has not been reported

Method used

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  • Method for improving quality of pyrolytic oil by pretreating biomass raw material by using freeze-thaw assisted low cosolvent and application of method
  • Method for improving quality of pyrolytic oil by pretreating biomass raw material by using freeze-thaw assisted low cosolvent and application of method
  • Method for improving quality of pyrolytic oil by pretreating biomass raw material by using freeze-thaw assisted low cosolvent and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Freeze-thaw (FT) pretreatment of bagasse raw materials: mix bagasse powder (BP) and distilled water at a ratio of 1:15 (g / mL) solid-liquid ratio, place them in a centrifuge tube, and continuously shake (300r / mL) min stirring 5min) to promote the uniform dispersion of bagasse in water. Then, the centrifuge tube containing the bagasse solution was hoisted into a liquid nitrogen tank (-196° C.) and frozen for 1 hour. After the freezing time, the centrifuge tube was taken out and thawed at room temperature. Finally, the freeze-thawed bagasse was vacuum filtered and washed with (50%, v / v) alcohol solution until the filtrate was colorless and transparent, and dried in an oven at 105° C. for 24 hours.

[0054] (2) Preparation of imidazole-deep eutectic solvent system: Weigh 39.50 g of imidazole and 40.50 g of choline chloride in a thick-walled pressure bottle, place them in an oil bath at 125°C, heat and stir at 300 r / min The speed reaction was carried out for 30 min unti...

Embodiment 2

[0058] (1) Freeze-thaw pretreatment of bagasse raw materials: mix bagasse powder (BP) and distilled water in a ratio of 1:15 (g / mL) solid-liquid ratio, place in a centrifuge tube, and continuously shake (300r / min for 5min) ) to promote the uniform dispersion of bagasse in water. Then, the centrifuge tube containing the bagasse solution was hoisted into a liquid nitrogen tank (-196° C.) and frozen for 2 hours. After the freezing time, the centrifuge tube was taken out and thawed at room temperature. Finally, the freeze-thawed bagasse was vacuum filtered and washed with (50%, v / v) alcohol solution until the filtrate was colorless and transparent, and dried in an oven at 105° C. for 24 hours.

[0059] (2) Preparation of imidazole-deep eutectic solvent system: Weigh 39.50 g of imidazole and 40.50 g of choline chloride in a thick-walled pressure bottle, place them in an oil bath at 125°C, heat and stir at 300 r / min The speed reaction was carried out for 30 min until the mixed reag...

Embodiment 3

[0063] (1) Freeze-thaw pretreatment of bagasse raw materials: mix bagasse powder (BP) and distilled water at a ratio of 1:15 (g / mL) solid-liquid ratio and place them in a centrifuge tube, then add 30 mL of distilled water, and shake continuously ( 300r / min stirring for 5min) to promote the uniform dispersion of bagasse in water. Then, the centrifuge tube containing the bagasse solution was hung into a liquid nitrogen tank (-196° C.) and frozen for 3 hours. After the freezing time, the centrifuge tube was taken out and thawed at room temperature. Finally, the freeze-thawed bagasse was vacuum filtered and washed with (50%, v / v) alcohol solution until the filtrate was colorless and transparent, and dried in an oven at 105° C. for 24 hours.

[0064] (2) Preparation of imidazole-deep eutectic solvent system: Weigh 39.50 g of imidazole and 40.50 g of choline chloride in a thick-walled pressure bottle, place them in an oil bath at 125°C, heat and stir at 300 r / min The speed reaction...

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Abstract

The invention discloses a method for improving the quality of pyrolytic oil by pretreating a biomass raw material by using a freezing-thawing-assisted low cosolvent and application of the method. The method comprises the following steps: (1) adding a biomass raw material into water, uniformly stirring and mixing, freezing in a liquid nitrogen environment at-196 DEG C for 1-4 hours, taking out, recovering to room temperature, melting, repeating the freezing and thawing operation for 0-4 times, separating solids, washing and drying to obtain a biomass raw material subjected to freezing and thawing pretreatment; (2) mixing imidazole and choline chloride, heating, stirring and dissolving to obtain an imidazole-eutectic solvent system, then adding the freeze-thaw pretreated biomass raw material, stirring and reacting, separating solids after the reaction, washing and drying to obtain solid residues; and (3) pyrolyzing the solid residues in a protective gas atmosphere at 450-600 DEG C to obtain pyrolyzed bio-oil. According to the method, the content of levoglucan in the pyrolysis bio-oil can be remarkably increased, and the quality of the pyrolysis oil is improved.

Description

technical field [0001] The invention belongs to the field of biomass resource utilization, and in particular relates to a method and application for pretreating biomass raw materials by using freeze-thaw assisted low co-solvent to improve the quality of pyrolysis oil. Background technique [0002] Bagasse (BP), the main waste produced in the sugar industry, is also a renewable biomass resource with rich energy potential that can be value-added into various intermediate chemicals. According to reports, the total global bagasse production in 2014 was about 1.9 billion tons. The large amount of bagasse waste presents new opportunities for the production of biofuels or bio-based materials. Bagasse is mainly composed of three chemical components: cellulose, lignin and hemicellulose, and hydrogen bonds are the main connecting bonds between the components. In addition to hydrogen bonds, there are some covalent bonds between lignin and hemicellulose, which make the structure of ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/02C10B57/08C10G1/00
CPCC10B53/02C10B57/08C10G1/00Y02E50/10
Inventor 许细薇张帆孙焱王红余海鹏李凌昊贾志文吴宇健涂任范旭东
Owner SOUTH CHINA AGRI UNIV
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