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A kind of preparation method of ketone-rich bio-oil and magnesium-rich activated carbon

A bio-oil and activated carbon technology, applied in the field of agricultural and forestry waste pyrolysis, can solve the problems of low utilization efficiency of biomass energy, consumption of large chemicals, and no efficient utilization, etc., to reduce the content of oxygen-containing substances, reduce complexity, and improve The effect of utilization efficiency

Active Publication Date: 2019-11-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

The biochar prepared by this method has an adsorption capacity of more than 100 mg / g of phosphorus, but this method needs to consume a large amount of chemicals, and the energy consumption in the process of pyrolysis to prepare pyrolytic carbon is relatively high, and the gas and oil produced by pyrolysis and other products are not efficiently utilized, and the utilization efficiency of biomass energy is low

Method used

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  • A kind of preparation method of ketone-rich bio-oil and magnesium-rich activated carbon
  • A kind of preparation method of ketone-rich bio-oil and magnesium-rich activated carbon
  • A kind of preparation method of ketone-rich bio-oil and magnesium-rich activated carbon

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preparation example Construction

[0033] A method for preparing ketone-rich bio-oil and a method for preparing magnesium-rich activated carbon provided in the embodiments of the present invention, wherein the ketone-rich bio-oil is obtained by pyrolysis of seawater modified agricultural and forestry waste, such as Figure 4 As shown, it includes the following steps:

[0034] 1) washing agricultural and forestry waste with deionized water, grinding and sieving to obtain agricultural and forestry waste powder;

[0035] 2) Mix the agricultural and forestry waste powder obtained in step 1) with seawater, and use magnetic stirring to fully mix the two to obtain a mixture, and then dry the mixture to obtain the agricultural and forestry waste powder modified by seawater, wherein The main component in seawater is MgCl 2 , the concentration is 1540mg / L, that is, one liter of seawater contains 1540mg of MgCl 2 ;

[0036] 3) Send the modified agricultural and forestry waste powder obtained in step 2) into a pyrolysis...

Embodiment 1

[0049] Crush and sieve corn stalks to 60-120 mesh, put them in an oven and dry at 105°C for 24 hours to obtain corn stalk powder, mix corn stalk powder and seawater with different solid-to-liquid ratios (3, 1.5, 1, 0.75, 0.6 ) for mixing, and using magnetic stirring for 4 hours to fully mix the corn stalk powder and seawater to obtain a uniformly mixed mixture of corn stalk powder and seawater, and dry the mixture of corn stalk powder and seawater at 105 ° C for 24 hours to obtain modified corn Rod powder; use a fixed-bed reactor (ie, a pyrolysis furnace) with a diameter of 45mm and a length of 60mm for pyrolysis, and heat the reactor to a specified temperature of 550°C at a heating rate of 10-20°C / min. Biomass (modified corn stalk powder) is quickly sent into the middle of the reactor, and the reaction time is 30 minutes, so that the modified biomass is fully pyrolyzed, and the pyrolysis reaction obtains pyrolytic charcoal and produces volatile matter, which is pyrolyzed in a ...

Embodiment 2

[0052] Control the solid-liquid mixing ratio of cornstalk and seawater to 2:5, and study the effect of pyrolysis temperature on ketone-rich bio-oil and magnesium-rich activated carbon. The pyrolysis temperatures are 450°C, 550°C, 650°C, 750°C, and 850°C, respectively , other conditions are identical with embodiment 1. Such as figure 2 As shown, at the pyrolysis temperatures of 450°C, 550°C, 650°C, 750°C and 850°C, the obtained bio-oils all contain high content of ketones, while the content of acetic acid is low, and the higher the temperature, the higher the ketones The higher the substance content, the lower the acetic acid content, and when the temperature reaches 850°C, the content of ketone substances tends to be stable. The magnesium-rich activated carbon prepared by the present invention has a high specific surface area, and has a higher magnesium content, such as image 3 As shown, the main forms of magnesium in activated carbon are MgO and Mg(OH) 2 , the magnesium ...

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Abstract

The invention belongs to the field of agricultural and forestry waste pyrolysis and specifically discloses a preparation method for ketone-rich bio-oil and magnesium-rich activated carbon. The methodcomprises the following steps: cleaning, grinding and sieving agricultural and forestry wastes, thereby acquiring the agricultural and forestry waste powder; mixing the agricultural and forestry wastepowder with seawater and uniformly stirring, thereby acquiring a mixture; drying the mixture, thereby acquiring the seawater modified agricultural and forestry waste powder; feeding the modified agricultural and forestry waste powder into a pyrolyzing furnace for performing pyrolytic reaction, thereby acquiring pyrolytic carbon and volatile components; washing and drying the pyrolytic carbon, thereby acquiring a magnesium-rich activated carbon material with high specific surface area and adsorption capacity; and cooling the volatile components, thereby acquiring the ketone-rich bio-oil. According to the invention, the raw material source is wide, the process is simple, the prepared ketone-rich bio-oil is simple in components, the magnesium-rich activated carbon is in large specific surface area and the phosphorus element in water can be removed.

Description

technical field [0001] The invention belongs to the field of pyrolysis of agricultural and forestry waste, and more specifically relates to a method for preparing ketone-rich bio-oil and magnesium-rich activated carbon. Background technique [0002] my country's agricultural and forestry wastes come from a wide range of sources and have huge reserves. There are three ways to use them: direct combustion, thermochemical conversion and biochemical conversion. The thermochemical method has the advantages of simple process, rapid reaction, high conversion rate, high conversion intensity and easy industrialization. And many other advantages. Pyrolysis is a kind of thermochemical method, which can conveniently decompose lignocellulosic biomass macromolecules into various valuable products. However, the composition of bio-oil obtained by direct pyrolysis of biomass is complex, and subsequent utilization is difficult. As an environmentally friendly material, biochar has great applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/02C10B57/00C10B57/06C10B57/08B01J20/20B01J20/30C01B32/324
CPCY02E50/10
Inventor 张世红朱丹晨陈应泉杨海平王贤华邵敬爱杨晴陈汉平
Owner HUAZHONG UNIV OF SCI & TECH
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