CN115784229A - Method for improving utilization rate of biomass resources - Google Patents
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- CN115784229A CN115784229A CN202211454188.8A CN202211454188A CN115784229A CN 115784229 A CN115784229 A CN 115784229A CN 202211454188 A CN202211454188 A CN 202211454188A CN 115784229 A CN115784229 A CN 115784229A
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- 239000002028 Biomass Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000004913 activation Effects 0.000 claims abstract description 54
- 239000006227 byproduct Substances 0.000 claims abstract description 52
- 238000000197 pyrolysis Methods 0.000 claims abstract description 42
- 239000007787 solid Substances 0.000 claims abstract description 30
- 230000003213 activating effect Effects 0.000 claims abstract description 29
- 239000012298 atmosphere Substances 0.000 claims abstract description 28
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 230000001681 protective effect Effects 0.000 claims abstract description 12
- 239000002243 precursor Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000012075 bio-oil Substances 0.000 claims abstract description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical group [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 72
- 238000010438 heat treatment Methods 0.000 claims description 40
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 38
- 238000001035 drying Methods 0.000 claims description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 229920002678 cellulose Polymers 0.000 claims description 6
- 239000001913 cellulose Substances 0.000 claims description 6
- 229920005610 lignin Polymers 0.000 claims description 6
- 229920001221 xylan Polymers 0.000 claims description 6
- 150000004823 xylans Chemical class 0.000 claims description 6
- 239000002023 wood Substances 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 abstract description 7
- 239000002994 raw material Substances 0.000 abstract description 6
- 239000001569 carbon dioxide Substances 0.000 abstract description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 4
- 239000003610 charcoal Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000036541 health Effects 0.000 abstract description 3
- 239000012190 activator Substances 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 238000007598 dipping method Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 16
- 238000005406 washing Methods 0.000 description 16
- 238000005303 weighing Methods 0.000 description 12
- 238000001514 detection method Methods 0.000 description 9
- 230000007935 neutral effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 244000166124 Eucalyptus globulus Species 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 229920005611 kraft lignin Polymers 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 108091000080 Phosphotransferase Proteins 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
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- 238000005755 formation reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 239000008204 material by function Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 102000020233 phosphotransferase Human genes 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
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- 239000010902 straw Substances 0.000 description 1
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
Abstract
The invention discloses a method for improving the utilization rate of biomass resources, which comprises the steps of pretreating biomass to prepare a calcined precursor; carrying out pyrolysis treatment on the precursor under a protective atmosphere to obtain bio-oil and a byproduct biochar, wherein the method comprises the steps of uniformly mixing the byproduct biochar with a solid activator to obtain a mixture; and (3) activating the obtained mixture under the protective atmosphere to obtain activated byproduct biochar. The invention directly takes the biomass fast pyrolysis byproduct biochar as the raw material, thereby reducing the cost and further improving the utilization rate of biomass resources. KOH solid and biochar are uniformly stirred and then directly activated, and compared with a dipping activation method, the activation effect is similar and the preparation time is shortened; compared with the activation of carbon dioxide or water vapor, the activation temperature is low, and the energy is saved. The total PAHs content in the activated charcoal is less than 20mg/kg, so that the risk of the charcoal to the environment and the human health in the actual application process is reduced.
Description
Technical Field
The invention belongs to the field of carbon material treatment, and particularly relates to a method for improving the utilization rate of biomass resources.
Background
The fast biomass pyrolysis is one of the most potential biomass energy conversion technologies, and the main product of the biomass energy conversion technology is bio-oil which can replace the traditional mineral energy as fuel and can also be used as raw material for synthesisChemical products with special purposes. However, there are two key technical difficulties: 1. the quality of the bio-oil is improved, and 2, the byproduct biochar is recycled. The existing research mainly focuses on the bio-oil quality improvement technology. The re-development and utilization of the byproduct biochar need to solve two important technical bottlenecks: 1. low specific surface area, 2, high Polycyclic Aromatic Hydrocarbon Species (PAHs) content. Compared with the slow pyrolysis biochar, the yield of the biochar as a byproduct of the fast pyrolysis is equivalent (20 to 35 percent), and the specific surface area is lower (the specific surface area is less than 20 m) 2 /g)([1]Liu，W.J.；Jiang，H.；Yu，H.Q.Development of biochar-based functional materials：toward a sustainable platform carbon material.Chem.Rev.2015，115(22)：12251-12285.[2]Liu，W.J.；Li，W.W.；Jiang，H.；Yu，H.Q.Fates of chemical elements in biomass during its pyrolysis.Chem.Rev.2017，117(9)：6367-6398.[3]Boateng, A.A. Characterisation and thermal conversion of a mechanical derived from fluidized-bed fast gasification oil production of switching grass, ind.Eng.chem.Res.2007, 46, 8857-8862. Research shows that the rapid pyrolysis heating time of biomass is short, the char formation reaction is insufficient, and condensable components (tar) such as PAHs (polycyclic aromatic hydrocarbons) remaining in the pore structure of the byproduct biochar are not only the main cause of low specific surface area, but also have significant biological toxicity (Wang, Y.Y., knotting, X.R., li, L.L., et al, biological activity evaluation of biological biochemical using a complex system of fast pyrolytic biochemical extracts of organic substances of the same biological kinase. The content of polycyclic aromatic hydrocarbon compounds (PAHs) in the fast pyrolysis biochar can reach 174mg/kg at most, and is far higher than the concentration (0.07-3.27 mg/kg) of the PAHs in the slow pyrolysis biochar. Referring to the regulations of the International biochar Association (the total PAHs value in the biochar should be less than 20 mg/kg), if the fast pyrolysis biochar is directly returned to the field, the fast pyrolysis biochar has great risks to the environment and human health.
The patent application with the publication number of CN115025760A discloses a preparation method and application of a biomass-derived hierarchical porous biochar adsorbent, wherein the preparation method comprises the steps of pretreating biomass to prepare a calcined precursor; preparing a calcined precursor and carbonizing; uniformly dispersing the prepared carbonized product and an activating agent in deionized water (an alkali liquor impregnation method), stirring in a water bath at 80 ℃ for 8-10 h, and drying overnight to obtain a mixture; and (3) activating the mixture for 1-3 h in a protective atmosphere to obtain the graded porous biochar for treating the polluted wastewater. The activation treatment of the invention aims to obtain the graded porous biochar adsorbent which can quickly remove pollutants in polluted wastewater and has high adsorption efficiency, namely the graded porous biochar for treating the polluted wastewater, no practical solution is provided for the problems of specific surface area and total PAHs content, and the treatment preparation time of the invention is longer, especially the time required by soaking and drying is longer.
The research of the literature finds that the eucalyptus kraft lignin is used as the raw material, the activation is carried out for 20h under the condition of 850 ℃, the BET surface area reaches 1300-1400 m 2 /g(Rodríguez-Mirasol J，Cordero T，Rodriguez J J.Activated carbons from carbon dioxide partial gasification of eucalyptus kraft lignin.Energy&fuels,1993,7 (1): 133-138.), the activation time of this study was too long. The temperature of the byproduct biochar carbon dioxide activation method is generally 900-1100 ℃, the activation time is longer, the energy consumption is larger, and the specific surface area after activation is also different from that of biochar prepared by a chemical activation method.
Therefore, the method for preparing the activated charcoal material with high specific surface area and low total PAHs content by a simple activation means has important significance.
Disclosure of Invention
The method takes biomass fast pyrolysis oil-making byproduct biochar as a raw material, and takes KOH solid as an activating agent to prepare activated biochar. The preparation method is simple and easy, does not need expensive equipment, and has wide raw material sources and low cost. The activated charcoal prepared by the method has high specific surface area (2600 m) 2 Per g) and whose total PAHs content complies with the international association for biochar (< 20 mg/kg), can be applied directly to the soil environment as a soil remediation or amendment.
The invention aims to provide a KOH solid activation and modification technology for preparing activated charcoal with high specific surface area and low total PAHs content, aiming at the technical bottleneck of recycling of biomass fast pyrolysis oil-making byproduct biochar.
The specific technical scheme of the invention is as follows:
the invention provides a method for improving the utilization rate of biomass resources, which comprises the steps of pretreating biomass to prepare a calcined precursor; carrying out pyrolysis treatment on the precursor under a protective atmosphere to obtain bio-oil and a byproduct biochar, wherein the method comprises the following steps:
(1) Uniformly mixing the byproduct biochar with a solid activating agent to obtain a mixture;
(2) And (2) under a protective atmosphere, activating the mixture obtained in the step (1) to obtain activated byproduct biochar.
The biomass is various biomasses such as straw, sawdust and bamboo sawdust; preferably, the biomass is wood chips, cellulose, lignin or xylan, but is not limited thereto. The pretreatment method of the biomass comprises the following steps: grinding the biomass into powdery particles, sieving the particles with a 100-mesh sieve and drying the particles.
Preferably, the protective atmosphere is nitrogen; and during pyrolysis treatment, the retention time of the protective atmosphere is 0.1-4 s. The pyrolysis temperature is 500-800 ℃, and the heating time is 15-30 min.
Preferably, in the step (1), the mass ratio of the biochar to the solid activating agent is 1: 6.
Preferably, the solid activator is potassium hydroxide.
KOH solid is used as an activating agent and is directly activated after being uniformly mixed with charcoal, so that the activation effect is ensured, and the preparation time can be shortened.
Preferably, in the step (2), the activation treatment conditions are as follows: the temperature is raised to 830 ℃ at the temperature raising rate of 5 ℃/min, and the activation time is 60min.
The biochar prepared by the method has high specific surface area (2600 m) 2 And/g) the total content of polycyclic aromatic hydrocarbon substances is lower, and the method is environment-friendly.
Compared with the prior art, the invention has the advantages that:
1. the invention directly takes the biomass fast pyrolysis byproduct biochar as the raw material, thereby reducing the cost and further improving the utilization rate of biomass resources.
2. KOH solid is used as an activating agent and is directly activated after being uniformly mixed with charcoal, compared with the impregnation activation method, the activation effect is similar, and the preparation time is shortened; compared with the activation of carbon dioxide or water vapor, the activation temperature is low, and the energy is saved.
3. The total PAHs content in the biochar activated by the method is reduced from more than 100mg/kg to less than 20mg/kg, so that the risk of the biochar to the environment and the human health in the actual application process is reduced.
Detailed Description
In the invention, the fast pyrolysis of biomass comprises the following steps:
1. grinding the biomass into powdery particles, sieving the particles with a 100-mesh sieve (the aperture is about 0.150 mm), and drying the particles for later use as a calcined precursor.
2. And carrying out fast pyrolysis on the precursor in a nitrogen protective atmosphere. And after the heating unit is heated to the set temperature, putting the biomass precursor into the heating unit for fast pyrolysis, wherein the retention time of nitrogen is 0.1-4 s, the pyrolysis temperature is 500-800 ℃, and the heating time is 15-30 min.
3. And the rear end of the heating unit is connected with a condensing device to collect bio-oil, the byproduct biochar is moved out of the heating unit after pyrolysis is finished, and is cooled to room temperature under the nitrogen atmosphere and then taken out to obtain the byproduct biochar for producing oil by fast pyrolysis of biomass.
Example 1
Weighing 1g of wood chip fast pyrolysis byproduct biochar at 500 ℃ and 6g of KOH solid, and quickly and uniformly mixing in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing with water to be neutral, and drying to obtain activated byproduct biochar with a BET specific surface area of 866m 2 (BET specific surface area before activation: 4.3 m) 2 Per g), total PAHs content of 16m g Kg (total PAHs content prior to activation is 86 mg/kg).
Example 2
Weighing 1g of sawdust fast pyrolysis byproduct at 600 DEG CThe charcoal was rapidly mixed with 6g KOH solid in the crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing to be neutral, and drying to obtain activated byproduct biochar with a BET specific surface area of 2602m 2 (BET specific surface area before activation was not detected (Instrument detection limit 5 m) 2 /g)), the total PAHs content was 14mg/kg (the total PAHs content before activation was 71 mg/kg).
Example 3
Weighing 1g of wood chip fast pyrolysis byproduct biochar at 700 ℃ and 6g of KOH solid, and quickly and uniformly mixing in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing to neutrality by water, and drying to obtain activated byproduct biochar with a BET specific surface area of 2402m 2 (BET specific surface area before activation was not detected (Instrument detection limit 5 m) 2 /g)), the total PAHs content was 18mg/kg (139 mg/kg total PAHs content before activation).
Example 4
Weighing 1g of wood chip fast pyrolysis byproduct biochar at 800 ℃ and 6g of KOH solid, and quickly and uniformly mixing the biochar and the KOH solid in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing to neutrality by water, and drying to obtain activated byproduct biochar with a BET specific surface area of 2520m 2 (BET specific surface area before activation 9.4 m) 2 (g), the total PAHs content is 16mg/kg (the total PAHs content before activation is 119 mg/kg).
Example 5
Weighing 1g of the by-product biochar of the rapid pyrolysis of the cellulose at 500 ℃ and 6g of KOH solid, and quickly and uniformly mixing in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing to neutrality by water, and drying to obtain activated byproduct biochar with a BET specific surface area of 1139m 2 (BET specific surface area before activation was not detected (Instrument detection limit 5 m) 2 /g)), the total PAHs content was 11mg/kg (the total PAHs content before activation was 40 mg/kg).
Example 6
1g of 600 ℃ cellulose fast pyrolysis byproduct biochar and 6g of KOH solid are weighed and quickly and uniformly mixed in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing to neutrality by water, and drying to obtain activated byproduct biochar with a BET specific surface area of 1366m 2 (BET specific surface area before activation 20.6 m) 2 /g), the total PAHs content is 17mg/kg (the total PAHs content before activation is 36 mg/kg).
Example 7
Weighing 1g of 700 ℃ cellulose fast pyrolysis byproduct biochar and 6g of KOH solid, and quickly and uniformly mixing the biochar and the KOH solid in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing to neutrality, and drying to obtain activated byproduct biochar with a BET specific surface area of 1520m 2 (BET specific surface area before activation 55.3 m) 2 /g), the total PAHs content is 13mg/kg (the total PAHs content before activation is 48.5 mg/kg).
Example 8
1g of the by-product biochar for fast pyrolysis of cellulose at 800 ℃ and 6g of KOH solid are weighed and quickly and uniformly mixed in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing to neutrality by water, and drying to obtain activated byproduct biochar with a BET specific surface area of 1969m 2 (BET specific surface area before activation 87.6 m) 2 /g), the total PAHs content is 16mg/kg (the total PAHs content before activation is 44 mg/kg).
Example 9
Weighing 1g of the byproduct biochar of the rapid pyrolysis of the lignin at 500 ℃ and 6g of KOH solid, and quickly and uniformly mixing in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing to neutrality by water, and drying to obtain activated byproduct biochar with a BET specific surface area of 1751m 2 (BET specific surface area before activation: 0.3 m) 2 /g), the total PAHs content is 16mg/kg (the total PAHs content before activation is 33 mg/kg).
Example 10
Weighing 1g of 600 ℃ lignin fast pyrolysis byproduct biochar and 6g of KOH solid, and quickly and uniformly mixing in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing with water to neutrality, and drying to obtain activated byproduct biochar with BET specific surface area of 1944m 2 (BET specific surface area before activation was not detected (Instrument detection limit 5 m) 2 /g)), the total PAHs content was 14mg/kg (the total PAHs content before activation was 35 mg/kg).
Example 11
Weighing 1g of the by-product biochar of the rapid pyrolysis of the lignin at 700 ℃ and 6g of KOH solid, and quickly and uniformly mixing in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing to neutrality by water, and drying to obtain activated byproduct biochar with a BET specific surface area of 1620m 2 (BET specific surface area before activation was not detected (Instrument detection limit 5 m) 2 /g)), the total PAHs content was 17mg/kg (the total PAHs content before activation was 42 mg/kg).
Example 12
Weighing 1g of 800 ℃ lignin fast pyrolysis byproduct biochar and 6g of KOH solid, and quickly and uniformly mixing in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing with water to neutrality, and drying to obtain activated byproduct biochar with a BET specific surface area of 1888m 2 (BET specific surface area before activation 6.1 m) 2 /g)), the total PAHs content was 15mg/kg (the total PAHs content before activation was 37 mg/kg).
Example 13
Weighing 1g of the byproduct biochar for fast pyrolysis of xylan at 500 ℃ and 6g of KOH solid, and quickly and uniformly mixing in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing to be neutral, and drying to obtain activated byproduct biochar with a BET specific surface area of 2037m 2 (BET specific surface area before activation was not detected (Instrument detection limit 5 m) 2 /g)), the total PAHs content was 8.8mg/kg (total P before activation)AHs content 19 mg/kg).
Example 14
Weighing 1g of 600 ℃ xylan fast pyrolysis byproduct biochar and 6g of KOH solid, and quickly and uniformly mixing in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing to be neutral, and drying to obtain activated byproduct biochar with a BET specific surface area of 2408m 2 (BET specific surface area before activation was not detected (Instrument detection limit 5 m) 2 /g)), the total PAHs content was 4.8mg/kg (21 mg/kg of total PAHs content before activation).
Example 15
1g of 700 ℃ xylan fast pyrolysis byproduct biochar and 6g of KOH solid are weighed and quickly and uniformly mixed in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing to be neutral, and drying to obtain activated byproduct biochar with a BET specific surface area of 2470m 2 (BET specific surface area before activation was not detected (Instrument detection limit 5 m) 2 /g)), the total PAHs content was 4.6mg/kg (the total PAHs content before activation was 33 mg/kg).
Example 16
1g of 800 ℃ xylan fast pyrolysis byproduct biochar and 6g of KOH solid are weighed and quickly and uniformly mixed in a crucible. Placing the crucible into an atmosphere furnace, heating to 830 ℃ at a heating rate of 5 ℃/min under the protection of nitrogen, activating for 60min, cooling, washing to neutrality by water, and drying to obtain activated byproduct biochar with a BET specific surface area of 2506m 2 (BET specific surface area before activation was not detected (Instrument detection limit 5 m) 2 /g)), the total PAHs content was 8.2mg/kg (total PAHs content before activation was 45 mg/kg).
Claims (8)
1. A method for improving the utilization rate of biomass resources comprises the steps of pretreating biomass to prepare a calcined precursor; and carrying out pyrolysis treatment on the precursor under a protective atmosphere to obtain bio-oil and a byproduct biochar, wherein the method comprises the following steps:
(1) Uniformly mixing the byproduct biochar with a solid activating agent to obtain a mixture;
(2) And (2) under a protective atmosphere, activating the mixture obtained in the step (1) to obtain activated byproduct biochar.
2. The method for improving the resource utilization of biomass according to claim 1, wherein the biomass is wood chips, cellulose, lignin or xylan.
3. The method for improving biomass resource utilization according to claim 2, wherein the pretreatment method of biomass comprises: grinding the biomass into powdery particles, sieving the particles with a 100-mesh sieve and drying the particles.
4. The method for improving the utilization rate of biomass resources according to claim 1, wherein the protective atmosphere is nitrogen; and during pyrolysis treatment, the retention time of the protective atmosphere is 0.1-4 s.
5. The method for improving the utilization rate of biomass resources according to claim 1, wherein the pyrolysis temperature is 500-800 ℃, and the heating time is 15-30 min.
6. The method for improving the utilization rate of biomass resources according to claim 1, wherein in the step (1), the mass ratio of the biochar to the solid activating agent is 1: 6.
7. The method for improving the utilization rate of biomass resources according to claim 1, wherein in the step (1), the solid activating agent is potassium hydroxide.
8. The method for improving the utilization rate of biomass resources according to claim 1, wherein in the step (2), the activation treatment conditions are as follows: the temperature is raised to 830 ℃ at the temperature raising rate of 5 ℃/min, and the activation time is 60min.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103865552A (en) * | 2014-03-27 | 2014-06-18 | 广东省农业科学院农业资源与环境研究所 | Method of preparing charcoal based on agricultural and forestry wastes and charcoal |
| CN105293491A (en) * | 2015-12-01 | 2016-02-03 | 浙江大学 | KOH solid activated active carbon preparation and forming method |
| CN114538408A (en) * | 2020-11-24 | 2022-05-27 | 中国科学院广州能源研究所 | Method for preparing high electrocatalytic activity biochar through micro-aerobic pyrolysis |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103865552A (en) * | 2014-03-27 | 2014-06-18 | 广东省农业科学院农业资源与环境研究所 | Method of preparing charcoal based on agricultural and forestry wastes and charcoal |
| CN105293491A (en) * | 2015-12-01 | 2016-02-03 | 浙江大学 | KOH solid activated active carbon preparation and forming method |
| CN114538408A (en) * | 2020-11-24 | 2022-05-27 | 中国科学院广州能源研究所 | Method for preparing high electrocatalytic activity biochar through micro-aerobic pyrolysis |
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