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Biomass carbonization treatment method

A treatment method and biomass technology, applied in the field of waste resource utilization, can solve the problems of high organic matter content, small carbonized particle size, and high organic matter content in waste acid, and achieve the effects of reducing organic matter content, developed pore structure, and large specific surface area

Active Publication Date: 2018-11-27
BEIJING ZFRK ENVIRONMENT &TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN103157509, CN103157512 disclose concentrated sulfuric acid and bagasse (or rice husk) mixed heating partial carbonization to prepare solid sulfonic acid, CN100421793, CN100421792 disclose the method for preparing solid sulfonic acid with plant raw material or carbohydrate, but carbonization is incomplete, solid carbon harvests Low rate, high content of organic matter in waste acid
There have been studies using sulfuric acid to catalyze the carbonization of sludge and cotton, but the degree of carbonization is low, requiring two carbonizations and the resulting carbonized particles are small in size, easily soluble in sulfuric acid, and difficult to separate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The rice husk is dried and crushed into rice husk powder.

[0033] Weigh 215.5 g of alkylated waste sulfuric acid (89.2 wt% acid concentration, 6.8 wt% organic matter) in a round bottom flask (500 mL), add rice husk powder with 20% waste sulfuric acid mass, and raise from room temperature to 200°C, and then maintained for 3.5 h.

[0034] Cool to room temperature, weigh 1 times the mass of waste sulfuric acid and add it to a round bottom flask, stir for 30 min, repeat washing with water and stir 3 times to obtain filtrate (dilute sulfuric acid solution) and filter cake (biomass charcoal), collect the filtrate Into the beaker, the COD value of the test filtrate is 1469.7mg / L. Slowly add ammonia water (25-28wt%) under stirring conditions until the solution is neutral, then evaporate the solution until ammonium sulfate crystals are precipitated. The filter cake was washed with deionized water until neutral, and dried at 100°C and 0.1 MPa for 2 hours to obtain 43.3 g of bi...

Embodiment 2

[0036] The rice husk is dried and crushed into rice husk powder.

[0037] Weigh 201.6 g of alkylated waste sulfuric acid (89.2 wt % acid concentration, 6.8 wt % organic matter) in a round bottom flask (500 mL), add rice husk powder equal to the mass of waste sulfuric acid and 5% rice husk powder Anhydride, from room temperature to 240 ° C, and then maintained for 0.5 h.

[0038] Cool to room temperature, weigh 1 times the mass of waste sulfuric acid and add it to a round bottom flask, stir for 30 min, repeat washing with water and stir 3 times to obtain filtrate (dilute sulfuric acid solution) and filter cake (carbon material), collect the filtrate to In the beaker, the COD value of the test filtrate was 1364.7mg / L. Slowly add ammonia water (25-28wt%) under stirring conditions until the solution is neutral, then evaporate the solution until crystals are precipitated. The filter cake was washed with deionized water until neutral, and dried at 150°C and 0.05 MPa for 3 hours to...

Embodiment 3

[0040] The corn stalks are dried and crushed into corn stalk powder.

[0041] Weigh 202.9 g of sulfuric acid (concentration: 98wt%) into a round bottom flask (500 mL), add corn stalk powder with 1 times the mass of sulfuric acid and ethylene tar with 10% of the mass of corn stalk powder, and raise the temperature from room temperature to 200 °C. Then maintain it for 2 h.

[0042] Cool to room temperature, weigh 1 times the mass of sulfuric acid and add it to a round bottom flask, stir for 30 min, repeat washing with water and stir 3 times to obtain filtrate (dilute sulfuric acid solution) and filter cake (carbon material), collect the filtrate into a beaker Among them, the COD value of the test filtrate was 1532.7mg / L. Slowly add ammonia water (25-28wt%) under stirring conditions until the solution is neutral, then evaporate the solution until crystals are precipitated. The filter cake was washed with deionized water until neutral, and dried at 200°C and 0.01 MPa for 3 hours...

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Abstract

The invention discloses a biomass carbonization treatment method, and belongs to the field of waste resource utilization. The biomass carbonization treatment method includes steps of (1), drying and smashing biomass to obtain biomass powder; (2), mixing and then heating the biomass powder, acid and catalysts with one another, and completely carbonizing biomass to obtain mixtures; (3), cooling themixtures generated at the step (2) until the temperatures of the mixtures reach the room temperature, adding solvents into the mixtures, carrying out stirring and washing until the acid adsorbed in charcoal is completely dissolved out, and carrying out drying to obtain biomass charcoal and diluted acid or salt. The biomass carbonization treatment method has the advantages that resource recycling and utilization can be carried out on the biomass by the aid of the biomass carbonization treatment method, the biomass carbonization treatment method is high in biomass charcoal yield, charcoal emission can be obviously reduced, and the biomass charcoal obtained by the aid of the biomass carbonization treatment method has an extremely high application value; the biomass carbonization treatment method includes few reaction steps and is low in energy consumption, low-cost carbonization treatment can be carried out on the biomass by the aid of the biomass carbonization treatment method, and the requirements of green chemistry can be met by the biomass carbonization treatment method.

Description

technical field [0001] The invention relates to a treatment method for biomass and belongs to the field of waste resource utilization. Background technique [0002] Biochar (Biochar), also known as biochar, biochar, biomass coke, etc. The main constituent elements of biochar are carbon, hydrogen, oxygen, nitrogen, etc., and also contain a small amount of trace elements, and the carbon content is generally above 60%. During the carbonization process, non-carbon elements decompose and escape to form a pore structure, so it has a certain porosity and specific surface area. The functional groups on the surface of biochar are very rich, including carboxyl groups, phenolic hydroxyl groups, acid anhydrides and other groups. Due to the strong affinity between carbon atoms, biochar has high chemical and biological stability and low solubility. These basic properties of biochar make it have adsorption performance, catalytic performance and anti-biodegradation ability, and it has a ...

Claims

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Application Information

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IPC IPC(8): C10B53/02C10B57/06C10B57/10
CPCC10B53/02C10B57/06C10B57/10Y02E50/10
Inventor 周志茂许世彬
Owner BEIJING ZFRK ENVIRONMENT &TECH CO LTD
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