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Method for preparing bio-oil reactant and bio-oil from lignocellulosic biomass

A lignocellulosic and biomass technology, applied in the direction of fat production, fat oil/fat production, etc., can solve the problems of chemical composition reduction, bio-oil chemical composition surge, uncontrollable and other problems, so as to suppress the generation of gas and reduce the process flow , Improve the effect of application value

Active Publication Date: 2016-07-06
SHENYANG AEROSPACE UNIVERSITY
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Problems solved by technology

Therefore, the chemical composition of bio-oil produced by direct hydrothermal liquefaction of lignocellulosic biomass is extremely complex and the content is scattered, which seriously affects the application value of bio-oil.
[0006] The patent application document with application publication number CN102071040A proposes a method for preparing bio-oil by liquefaction of delignified pretreated biomass, which uses physical, chemical or biological means to delignify the biomass, and then utilizes the remaining solid matter The hydrothermal liquefaction reaction, because the lignin is removed from the reactant, objectively reduces the chemical composition of the bio-oil produced, but this method also removes part of the hemicellulose and cellulose while removing the lignin, The overall utilization rate of biomass is greatly reduced
At the same time, due to the removal of lignin, the prepared bio-oil lacks monophenols and aromatics produced by lignin decomposition, which are extremely valuable components of bio-oil, which reduces the application value of bio-oil.
[0007] Through further analysis of lignocellulosic biomass, it can be known that cellulose and lignin are chain structures in its main components, and the chemical composition of cellulose and lignin in different types of lignocellulosic biomass is relatively stable. The chemical composition of the bio-oil produced in the hydrothermal liquefaction reaction is controllable and predictable; in contrast, the hemicellulose in the main component has a branched chain structure, and the hemicellulose of different kinds of lignocellulosic biomass except In addition to the difference in content, the main chemical components are also different, some are mainly fructose, some are mainly xylose, some are mainly lactose, etc. Therefore, hemicellulose in lignocellulose has a more complex chemical composition. Structure and distribution of chemical bond energy, this structural feature manifests itself in the decomposition of units of different structures during hydrothermal liquefaction, resulting in a surge and uncontrollable and unpredictable chemical composition of bio-oils

Method used

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  • Method for preparing bio-oil reactant and bio-oil from lignocellulosic biomass

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Effect test

Embodiment 1

[0049] Example 1: Preparation of bio-oil by hydrothermal liquefaction of primary reactants of corn stalks

[0050] Collect fresh corn stalks, wash them, chop them, and weigh 30g (8.553g on a dry basis) and place them in a 250mL Erlenmeyer flask. Firstly, 2% NaOH solution is used to soak the raw material for 0.5 hour, so as to achieve the effect of destroying the lignin structure without dissolving the lignin too much. Then rinse the residue with deionized water to neutrality, tilt the mouth of the triangular flask until no water drips out, and define the state of the raw material at this time as: the primary reactant. After alkali treatment, the changes in the primary reactant components are shown in Table 1 below. Due to the destruction of lignin, a small decrease occurred, and the corresponding dry basis specific gravity of cellulose increased slightly.

[0051] Table 1

[0052] Types of

Cellulose%

Hemicellulose%

lignin%

Reducing sugar mg / mL

...

Embodiment 2

[0055] Embodiment 2: dilute acid pretreatment prepares bio-oil reactant

[0056] Prepare several parts of primary reactants in Example 1, add appropriate amount of 1%, 2%, 3% dilute H 2 SO 4 Solution (v / v), add the amount so that the primary reactant is enough to soak it. Hydrolyze in a boiling water bath for 0.5h, 1h, and 1.5h respectively, take it out after the hydrolysis ends, cool to room temperature, add an appropriate amount of NaOH to adjust the pH value to neutral, and all the substances (including water) obtained at this time are prepared by the method of the present invention Bio-oil reactants. The DNS method was used to detect the concentration of reducing sugar obtained under different dilute acid treatment conditions, and the detection results are shown in Table 2. Table 2 The reducing sugar concentration of primary reactants after dilute acid pretreatment under different conditions

[0057] Dilute acid concentration / %

Hydrolysis time / h

Reduci...

Embodiment 3

[0060] Embodiment 3: dilute acid concentration 1%, hydrolysis 1.5 hours reactant prepares bio-oil

[0061] Also select the primary reactants in Example 1, add 150 mL of dilute sulfuric acid, the concentration of dilute sulfuric acid is 1%, and hydrolyze in a boiling water bath for 1.5 h. After the hydrolysis was finished, solid NaOH was added to adjust the pH value to be neutral. Add appropriate deionized water to adjust the total volume of solid and liquid in the Erlenmeyer flask to 200mL, then move it into the reaction kettle for hydrothermal liquefaction reaction, the reaction temperature is 370°C, and the reaction time is 30min. After the reaction, the bio-oil was extracted according to conventional methods. The mass of bio-oil was measured to be 3.2771g, and the volume of gas produced in the reaction was 0.389L. Further calculations obtained the liquefaction yield of bio-oil was 38.315%, the gas yield was 8.992%, and 75 substances were detected by bio-oil GC-MS , the to...

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Abstract

The invention discloses a method for preparing bio-oil reactants and bio-oil from lignocellulosic biomass. The present invention adopts the method of dilute acid hydrolysis, and utilizes the principle that dilute acid solution has a strong hydrolysis effect on hemicellulose in a boiling water bath, and first converts hemicellulose in lignocellulosic biomass raw materials into reducing sugars with simple structure, Thus, the optimization of the bio-oil reactant components is realized, the conversion path of hemicellulose is changed, and the types of chemical components in the prepared bio-oil are significantly reduced, and the application value of the bio-oil is improved.

Description

technical field [0001] The invention relates to a method for preparing bio-oil reaction and bio-oil from biomass raw materials, in particular to a method for preparing bio-oil reactants and bio-oil from lignocellulosic biomass Background technique [0002] Problems such as the shortage of traditional energy sources and the environmental pollution generated during energy consumption are becoming more and more severe, and the search for new sources of liquid fuels has become the focus of the world. Biomass is the product of photosynthesis of vegetation, with an output of about 173 billion tons per year and abundant resources. At the same time, biomass is also the only renewable carbon resource that can be converted into conventional solid, liquid and gaseous fuels and other chemical raw materials or products, and has CO 2 Near zero emission, less SOx and NOx emissions. Therefore, in recent years, the technology of converting biomass energy into liquid bio-oil has attracted i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L1/02C11B1/00
Inventor 李润东谢迎辉杨天华李秉硕开兴平宋闯
Owner SHENYANG AEROSPACE UNIVERSITY
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