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Method for extracting lignin from biomass by liquid nitrogen coupled microwave pretreatment

A pretreatment and lignin technology, which is applied in fiber raw material treatment, bulk chemical production, textile and paper making, etc., can solve problems such as recycling problems cannot be effectively solved, continuous production cannot be achieved, acid-base ammonia gas consumption, etc. , to achieve the effects of increased yield, less damage, and reduced input

Inactive Publication Date: 2018-07-24
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing treatment methods: physical pretreatment, chemical pretreatment, biological pretreatment, although the extraction efficiency of biomass components can be increased to a certain extent, but the desired effect has not yet been achieved. The biggest problem is that the cost is too high and the equipment requirements High, continuous production cannot be achieved, the addition of acid and alkali or the consumption of ammonia in the process increases the cost, and the recycling problem cannot be effectively solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Sawdust (birch) is crushed and passed through a 20-mesh sieve, and 100g is taken as a raw material for low-temperature pretreatment with liquid nitrogen; dried and immersed in liquid nitrogen, the immersion time is 2min, and the number of immersion times is 5 times, and then the water content of the material is adjusted to 25wt%. , mix the raw materials evenly, and let it stand for 1h, put it into a microwave device for processing, the microwave power is 2kW, the processing time is 100s, repeat the microwave processing twice, and then carry out the determination of water content and X-ray diffraction to determine the degree of crystallinity; the end of microwave processing After that, put it into a 200ml reaction kettle, use 30% concentration (volume concentration) of 1,4-butanediol to extract, the solid-liquid ratio is 1:6 (g / mL), and the extraction temperature is 160°C. The extraction time was 120 min, filtered under reduced pressure, the supernatant was adjusted to pH...

Embodiment 2

[0025] Corn stalks are crushed and passed through a 30-mesh sieve, and 100g is taken as a raw material for low-temperature pretreatment with liquid nitrogen; dried and immersed in liquid nitrogen for 5 minutes and 3 times of immersion, and then adjust the water content of the material to 35wt%, uniform Mix the raw materials and let stand for 3 hours, put them into a microwave device for processing, the microwave power is 5kW, the processing time is 200s, repeat the microwave treatment twice, then carry out the determination of water content and X-ray diffraction to determine the degree of crystallinity; after the microwave treatment is completed, Put it into a 200ml reaction kettle, use 30% concentration (volume concentration) of 1,4-butanediol for leaching, the solid-liquid ratio is 1:6 (g / mL), the leaching temperature is 180°C, and the leaching time After 180 min, filter under reduced pressure, adjust the pH to 4 with 2 mol / L hydrochloric acid in the supernatant and centrifug...

Embodiment 3

[0028] Walnut shells are crushed and passed through a 20-mesh sieve, and 100g is taken as a raw material for liquid nitrogen low-temperature pretreatment; dried and immersed in liquid nitrogen, the immersion time is 12min, and the number of immersion times is 8 times, and then the water content of the sample is adjusted to 40wt%. Mix the raw materials and let them stand for 4 hours, put them into a microwave device for processing, the microwave power is 8kW, the processing time is 300s, repeat the microwave treatment 3 times, then carry out the determination of water content and the determination of crystallinity by X-ray diffraction; after microwave treatment, use Choline chloride / boric acid (3:5) combined deep eutectic solvent (DES) for leaching, the solid-to-liquid ratio is 1:12 (g / mL), leaching at 90°C for 120min; filter under reduced pressure, The supernatant was centrifuged when the pH was adjusted to 4 with 2 mol / L hydrochloric acid, and the obtained sediment was dried t...

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PUM

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Abstract

The invention discloses a method for extracting lignin from biomass by liquid nitrogen coupled microwave pretreatment. The method comprises the following steps: crushing biomass raw materials, passingthrough a sieve with 20 to 100 meshes and then using liquid nitrogen treatment; then adjusting the water content of materials to 20 to 40 weight percent and standing for 1 to 6 hours; putting into amicrowave device for treating, wherein microwave power is 1 to 10 kW and the treating time is 30 to 600s; repeating for 2 to 6 times; leaching and filtering the materials subjected to microwave treatment to obtain filter residues and supernatant; adjusting the pH value of the supernatant by using hydrochloric acid, then centrifuging and drying the obtained sediment to obtain the lignin. Accordingto the method for extracting the lignin from the biomass by the liquid nitrogen coupled microwave pretreatment, disclosed by the invention, biomass is pretreated by using the liquid nitrogen coupled microwave, so that a biomass pretreatment process is optimized and the extraction efficiency and the purity of the lignin are effectively improved.

Description

technical field [0001] The invention relates to the technical field of biomass pretreatment and lignocellulose extraction, in particular to a method for extracting lignin from biomass by liquid nitrogen coupling microwave pretreatment. Background technique [0002] The reserves of petrochemical resources are limited, and have been increasingly depleted with the development of industry. Biomass resources, as the most abundant recyclable, renewable and degradable important resources on the earth, are presented to researchers with their unique advantages, which has attracted widespread attention. interest of. The conversion of biomass into energy, chemicals and materials through biorefinery technology will be a research hotspot for a long time in the future, and it is also an inevitable means to solve future human environment, resource and energy problems. Biorefinery, taking the production of bioenergy as an example, its basic process is: biomass collection, pretreatment, com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00C08H7/00
CPCC08H6/00D21C5/00Y02P20/54
Inventor 徐建赵勇徐霞崔平张楷
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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