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Method for preparing bio oil through delignification pretreatment and liquefaction

A delignification and pretreatment technology, applied in the field of delignification pretreatment liquefaction to prepare bio-oil, can solve the problems of harsh reaction conditions, short heating rate, short residence time, rapid cooling, wide product distribution, etc., and achieve biomass conversion rate high effect

Inactive Publication Date: 2011-05-25
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

Among them, rapid pyrolysis liquefaction to prepare bio-oil is the cutting-edge technology in the research and development of biomass energy in the world (Wen Congke, Qiao Xu, Zhang Jinping, Research Progress of Biomass High Pressure Liquefaction Technology[J]. Biomass Chemical Engineering, 2006 , 40(1):32-34), but this technology requires high equipment and harsh reaction conditions, with a temperature of 500-600°C, a heating rate of 103-104°C / s, a very short residence time, rapid cooling, and product distribution. Widely, although the liquid yield can reach 70-80%, the liquid product contains about 15-30% water

Method used

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  • Method for preparing bio oil through delignification pretreatment and liquefaction
  • Method for preparing bio oil through delignification pretreatment and liquefaction

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Liquefaction of corn stover without adding catalysts by delignification pretreatment

[0035] 1. Delignification pretreatment

[0036] Dry the corn stalks to a moisture content of 8%, and crush them to a fineness of 40 meshes. Add 100 g of crushed corn stalks to 200 g of water, chlorine gas is generated by adding 15 g of sodium hypochlorite and 15 mL of acetic acid, adjust the pH to 2, heat to 75 ° C and react for 80 minutes, and the lignin content of pretreated corn stalks is measured to be 29%. Accounting for 80% of the lignin content of untreated corn stalks (the lignin content of untreated corn stalks is 36%), the treated corn stalks are washed with water to remove the remaining sodium chlorite and acetic acid, dried to remove water.

[0037] 2. High pressure liquefaction

[0038] Add 10 g of corn stalks obtained in step 1 and 100 g of ethanol into a batch-type high-temperature and high-pressure reactor (Dalian Automatic Control Equipment Factory, GCF reactor, vol...

Embodiment 2

[0043] Liquefaction of delignified pretreated corn stalks with addition of catalysts

[0044] Get 10g embodiment 1 through delignification pretreated corn stalks, 100g ethanol and 1g sodium carbonate catalyst and join in the batch type high-temperature high-pressure reactor identical with embodiment 1, carry out by the same condition as in embodiment 1 Reaction, separation process is with the process in embodiment 1. Table 2 shows the change data of bio-oil yield with temperature after delignification pretreatment of corn stalks under the action of ethanol and potassium carbonate. The product yield is calculated based on the mass of the obtained product divided by the amount of raw material added to the reactor after removing the ash.

[0045] Table 2 shows that the yield of light oil increases with the increase of temperature, reaches the maximum value of 19.52% at the temperature of 280°C, and then the yield of light oil begins to decrease. The total bio-oil yield also rea...

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Abstract

The invention discloses a method for preparing bio oil through delignification pretreatment of biomass and liquefaction. In the method, biomass is subjected to delignification pretreatment and then liquefaction reaction in the presence of a solvent and a catalyst so as to prepare the bio oil. The method comprises the following steps of: performing delignification pretreatment on the biomass by using a chemical delignification agent or a biological method or mechanically performing delignification pretreatment on the biomass; and performing high-pressure liquefaction reaction on the biomass subjected to delignification pretreatment in the presence of a solvent and a catalyst or in the absence of the catalyst to prepare the bio oil. Compared with a method for preparing the bio oil by liquefying the biomass not subjected to delignification pretreatment, the method for preparing the bio oil by performing delignification pretreatment on the biomass and liquefying under the equal condition has the advantage that the yield of the bio oil is improved obviously.

Description

technical field [0001] The invention relates to the fields of bioengineering and energy, in particular to a method for preparing bio-oil through delignification pretreatment and liquefaction. Background technique [0002] Due to the decrease of fossil energy and the aggravation of environmental pollution caused by the use of fossil energy, scientists have focused their attention 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 various clean fuels and replace coal, oil and natural gas fuels. , produce electricity, and produce chemical products, which are highly valued by countries all over the world. [0003] my country's biomass resources are very rich, and the total amount of resources is not less than 3 billion tons of dry matter / a, which is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/00
Inventor 孙润仓刘华敏任俊莉王小慧王小英刘传富
Owner SOUTH CHINA UNIV OF TECH
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