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Method for preparing biological carbon through high pressure liquefaction of biomass

A biomass and bio-carbon technology, applied in the preparation of liquid hydrocarbon mixtures, petroleum industry, etc., can solve problems such as by-product residues, and achieve the effects of reducing environmental pollution, low cost and simple process

Inactive Publication Date: 2012-01-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the production of solid fuels by high-pressure liquefaction, that is, by-product residues in the process of producing bio-oil by high-pressure liquefaction of biomass

Method used

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  • Method for preparing biological carbon through high pressure liquefaction of biomass
  • Method for preparing biological carbon through high pressure liquefaction of biomass
  • Method for preparing biological carbon through high pressure liquefaction of biomass

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Dry the corn stalks to a moisture content of 8%, and crush them to a fineness of 40 meshes. Add 10 g of crushed corn stalks and 100 mL of ethanol to a batch-type high-temperature and high-pressure reactor (PARR Company, USA, volume 1 L) for liquefaction reaction. Heating at room temperature to 300°C, the reaction time is 0, 40 and 80 minutes respectively, and the reaction pressure is 1 to 7 MPa, and the liquefied product is obtained after the completion of the reaction; the liquefied product is dissolved in water and washed to separate the water-soluble product, and the water-insoluble product is used Acetone washes the organic soluble product at the separation, and the remaining insoluble solid is biochar.

[0027] The specific separation process is as follows: after vacuum distilling off the residual ethanol in the liquefied product at 70°C, add 150 mL of deionized water to the remaining residue to extract water-soluble organic matter and water-insoluble residue, and ...

Embodiment 2

[0035] Dry the cypress to a moisture content of 6%, and crush it to a fineness of 40 meshes. Get 10 g of pulverized cypress powder and 100 mL of water into the same batch-type high-temperature and high-pressure reactor as in Example 1, and heat the reactor so that the temperature rises to 260 ° C, 280 ° C and 300 ° C respectively, and the reaction pressure is respectively 4.9 MPa, 6.6MPa and 10.2MPa, the separation process is the same as that in Example 1. Table 2 shows the change data of residue yield and biochar elements (C, H, N, O) with temperature under the action of high-pressure hot water of cypress powder, and the calculation method is the same as that of Example 1. The mass percentages of biological carbon elements C, H, N, and O in the raw materials were 48.87, 5.99, 0.3, and 44.84 (wt%), respectively, and the calorific value was 17 MJ / Kg. Table 2 shows that after the cypress is liquefied with high-pressure hot water, the calorific value of the residue is as high as...

Embodiment 3

[0039] The cypress raw material is the same as that used in Example 2, and the cypress is dried to a water content of 10%, and crushed to a fineness of 40 meshes. Get 10 g of pulverized cypress powder and 100 mL of water into the same batch-type high-temperature and high-pressure reactor as in Example 1, heat the reactor so that the temperature rises to 260° C., and the reaction stays at 260° C. for 10 minutes , 20 minutes, 30 minutes and 40 minutes, the reaction pressure is 4 to 6MPa, and the separation process is the same as the process in Example 1.

[0040] Table 3 shows the change data of residue yield and bio-carbon elements (C, H, N, O) with reaction time at 260°C. The calculation method is the same as that in Example 1. When the time reaches 30 to 40 minutes, it is as high as 26.2MJ / Kg, and when the reaction is 40 minutes, the heat value of the residue yield is as high as 37.8%.

[0041] table 3

[0042]

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Abstract

The present invention provides a method for preparing biological carbon through high pressure liquefaction of biomass. The method comprises that: the biomass and solvents are mixed and subjected to a liquefaction reaction for 0-80 minutes in the protection of inert atmosphere to obtain a liquefied product, wherein the reaction temperature is controlled to 180-450 DEG C, the reaction pressure is controlled to 1-20 MPa; the liquefied product is subjected to extraction and separation to respectively obtain the water-soluble organic product and the insoluble product; the insoluble product is subjected to extraction and separation to obtain the solid product, which is the biological carbon. The liquefaction reaction can be performed in the presence of a catalyst, wherein the catalyst comprises an acidic catalyst, a basic catalyst, a salt catalyst and a molecular sieve catalyst. The calorific value of the prepared biological carbon provided by the present invention is up to 20-33 MJ / Kg, and is equivalent to the calorific value of coal, such that the prepared biological carbon provided by the present invention can be adopted as a substitute of the natural coal.

Description

technical field [0001] The invention relates to the fields of bioengineering and energy, in particular to a method for preparing biochar from high-pressure liquefied biomass. Background technique [0002] my country's energy reserves are very rich, but due to the large population and low energy utilization efficiency, my country's per capita energy consumption is far below the average level of developed countries and the world. my country's oil imports are increasing year by year, and the unstable factors of energy consumption are becoming more and more obvious. In addition, the utilization of fossil energy has brought about the aggravation of environmental pollution. Therefore, scientists focus on the development of new energy and renewable energy. Among all kinds of renewable energy, biomass resources have the advantages of renewability, wide distribution, and environmental friendliness. Biomass energy conversion technology can efficiently use biomass resources to produce ...

Claims

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Application Information

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IPC IPC(8): C10G1/00
Inventor 刘华敏孙润仓任俊莉
Owner SOUTH CHINA UNIV OF TECH
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