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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the production of solid fuels by high-pressure liquefaction, that

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

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Example Embodiment

[0025] Example 1

[0026] Dry the corn stalks to a moisture content of 8% and crush them to a fineness of 40 mesh. Add 10 g of crushed corn stalks and 100 mL of ethanol into a batch high-temperature and high-pressure reactor (PARR, USA, volume 1L) for liquefaction. Before liquefaction, nitrogen is introduced into the reactor to empty the oxygen in the reactor. The reaction temperature is from Heat to 300℃ at room temperature, the reaction time is 0, 40 and 80 minutes respectively, the reaction pressure is 1 to 7 MPa, and the liquefied product should be obtained after the end; the liquefied product is dissolved in water and washed to separate water-soluble products, and the water-insoluble products are used Acetone washes the separated organic soluble products, and the remaining insoluble solid is biochar.

[0027] The specific separation process is as follows: After vacuum distillation of the residual ethanol in the liquefied product at 70°C, 150 mL of deionized water is added to ...

Example Embodiment

[0034] Example 2

[0035] The cypress is dried to a moisture content of 6% and crushed to a fineness of 40 mesh. Take 10g of pulverized cypress powder and 100mL of water into the same batch high temperature and high pressure reactor as in Example 1. Heat the reactor to raise the temperature to 260℃, 280℃ and 300℃ respectively, and the reaction pressure is 4.9. MPa, 6.6 MPa and 10.2 MPa, the separation process is the same as that in Example 1. Table 2 shows the temperature change data of the residue yield and biological carbon elements (C, H, N, O) of cypress powder under the action of high-pressure hot water. The calculation method is the same as that of Example 1. The mass percentages of C, H, N and O of the raw materials are respectively 48.87, 5.99, 0.3, 44.84 (wt%), and the calorific value is 17 MJ / Kg. Table 2 shows that the calorific value of the residue after cypress liquefaction is as high as 26.3MJ / Kg, which is 6.3MJ / Kg higher than the calorific value of the raw materi...

Example Embodiment

[0038] Example 3

[0039] The raw material of cypress is the same as that used in Example 2. The cypress is dried to a water content of 10% and crushed to a fineness of 40 mesh. Take 10g of pulverized cypress powder and 100mL of water into the same batch high temperature and high pressure reactor as in Example 1. Heat the reactor to raise the temperature to 260℃, and the reaction stays at 260℃ for 10 minutes. , 20 minutes, 30 minutes, and 40 minutes, the reaction pressure is 4 to 6 MPa, and the separation process is the same as that in Example 1.

[0040] Table 3 shows the change data of the residue yield and the biological carbon elements (C, H, N, O) with the reaction time at 260°C. The calculation method is the same as that of Example 1. It can be seen from the table that the calorific value of the residue is in the reaction When the time reaches 30-40 minutes, it is as high as 26.2MJ / Kg. When the reaction time is 40 minutes, the calorific value of the residue yield is as hig...

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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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