Biomass liquefaction method in presence of coupling action of subcritical/supercritical cyclohexane and molecular sieve

A supercritical and biomass technology, applied in chemical instruments and methods, biofuels, chemical/physical processes, etc., can solve the problems of corrosion, harsh reaction conditions, and poor thermal stability of bio-oil, etc. The effect of mild reaction conditions and low critical pressure

Active Publication Date: 2011-04-20
SOUTH CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rapid pyrolysis of biomass to produce bio-oil is the cutting-edge technology of biomass energy research and development in the world, but this technology requires high equipment and harsh reaction conditions, and its liquid products have high oxygen content and low hydrogen-to-carbon ratio. During the utilization of the product bio-oil, it is necessary to overcome the problems of poor thermal stability and corrosiveness of bio-oil (Sharma A et al, 1999)
Compared with fast pyrolysis liquefaction technology, high-pressure liquefaction technology has relatively low equipment requirements and is easy to produce on an industrial scale. The quality of its liquid products is slightly better than that of pyrolysis oil, but it needs further refining before it can be used as engine fuel, and the cost is relatively high. These problems restrict the large-scale utilization of this technology (Wang Gang et al., 2008)
However, there is no report on the direct liquefaction of biomass under the coupling of subcritical or supercritical oxygen-free organic solvents and molecular sieve catalysts.

Method used

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  • Biomass liquefaction method in presence of coupling action of subcritical/supercritical cyclohexane and molecular sieve
  • Biomass liquefaction method in presence of coupling action of subcritical/supercritical cyclohexane and molecular sieve
  • Biomass liquefaction method in presence of coupling action of subcritical/supercritical cyclohexane and molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 20 g of dried corn stalk powder with a particle size of 40-60 mesh, 1 g of molecular sieve catalyst (this example uses a commercially available molecular sieve mainly containing REUSY-type zeolite, and the product number provided by the manufacturer is BCR-2), 20 ml Pure cyclohexane was added into a batch-type autoclave with a volume of 1 L and equipped with a magnetic stirrer, sealed and heated to 310 °C, and kept at this temperature for 0.5-80 min. Cool to room temperature and collect the product. Products that are gaseous at normal temperature and pressure are gas phase products. Wash the inner wall of the reactor with absolute ethanol to obtain a solid-liquid product, place it at room temperature and wait for the ethanol to dry up, add distilled water to extract water-soluble organic matter, that is, light oil, use a vacuum pump to filter, and use a rotary evaporator to evaporate the filtrate to remove water. The remaining substances are water-soluble organic ...

Embodiment 2

[0038] Using the same method and steps as in Example 1, the difference is that no molecular sieve catalyst is added.

[0039] The experimental results are shown in Table 4 and attached figure 1 As shown, the data in Table 4 show that in the cyclohexane medium under sub / supercritical conditions, with the increase of the reaction time, the yield of bio-oil, light oil yield and conversion rate of corn stalks obtained after the conversion of corn stalks were all the same. Gradually increase. When the reaction time is 80 min, the conversion rate of straw can reach 66.22%, the yield of bio-oil is 35.92%, and the yield ratio of light and heavy oil is 9.26.

[0040] Table 4 Liquefaction results of corn stover under the action of sub / supercritical cyclohexane

[0041]

[0042] attached figure 1 It shows that in the sub / supercritical cyclohexane medium, without the presence of molecular sieve catalyst, the conversion rate of corn stover increases with the reaction time; under the ...

Embodiment 3

[0047] Table 5 Liquefaction results of corn stover under the coupling action of sub / supercritical cyclohexane and molecular sieve

[0048]

[0049] The data in Table 5 shows that under the coupling action of cyclohexane and molecular sieve catalyst under sub / supercritical conditions, the yield of bio-oil obtained after conversion of corn stover is higher with the increase of reaction temperature within 285-310 °C. , light oil yield and conversion all increase with the increase of reaction temperature. When the reaction temperature was 310 ℃, the straw conversion rate, bio-oil yield and light-to-heavy oil yield ratio all reached the highest values, which were 65.45%, 39.64% and 22.21, respectively.

[0050] Example 4

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Abstract

The invention discloses a biomass liquefaction method in the presence of coupling action of subcritical/supercritical cyclohexane and molecular sieve. Subcritical/supercritical cyclohexane serves as a medium, and a molecular sieve catalyst containing zeolite ingredients serves as a catalyst. The biomass, the cyclohexane and the molecular sieve catalyst containing zeolite ingredients react at a temperature of 285-330 DEG C under pressure of 1.7-4.2 Mpa to prepare into biomass oils. High-efficiency conversion of the biomass can be realized by the coupling action of the cyclohexane solvent and the molecular sieve catalyst under the subcritical or supercritical condition. Compared with a method using a subcritical (or supercritical) solvent without adding a catalyst or a biomass catalytic conversion method under the non-subcritical (or non-supercritical) condition, the biomass liquefaction method provided by the invention is used to obviously improve the conversion rate of the biomass andthe quality of the converted products.

Description

technical field [0001] The invention relates to a method for realizing high-efficiency conversion of biomass by utilizing the coupling effect of an organic anaerobic solvent under subcritical or supercritical conditions and a molecular sieve catalyst. The biomass conversion product can be used to prepare basic chemical raw materials, fuel oil and the like. Background technique [0002] With the development of industry and the growth of population, human beings' demand for energy is increasing day by day, among which fossil energy is currently the main energy. Fossil energy is non-renewable, leading to its depletion, and in the process of large-scale exploitation and utilization of fossil energy, it has caused serious environmental pollution problems. Therefore, looking for a renewable and environmentally friendly energy source has become the focus of widespread concern in society. Biomass can just fill this gap. Biomass energy has the following characteristics: renewable, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/02B01J8/00
CPCY02E50/13Y02E50/10
Inventor 解新安李娴李雁郑朝阳李璐
Owner SOUTH CHINA AGRI UNIV
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