Method for preparing liquid alkane fuel by upgrading bio-oil in aqueous phase catalytic mode

A liquid alkane and bio-oil technology, which is applied in the fields of chemical technology and biomass utilization, can solve problems such as unsatisfactory catalytic cracking effect, carbon coking on the surface of the catalyst, and unstable properties of bio-oil, so as to reduce the loss of latent heat of gasification and reduce oil quality. The effect of high quality and wide raw material adaptability

Active Publication Date: 2010-10-27
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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Problems solved by technology

This process has the advantages of mild reaction conditions and low operating costs, but the oxygen content in the product oil is about 15-20%, and the content of hydrocarbons is very low, so the quality of the oil product is poor, and the coking process on the catalyst surface is prone to occur, resulting in catalyst loss. Live and other issues, thus limiting the further development of the process
[0008] In summary, the effects of catalytic hydrogenation and catalytic cracking of bio-oil are not ideal, mainly due to the following three reasons: 1) The nature of bio-oil is unstabl

Method used

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  • Method for preparing liquid alkane fuel by upgrading bio-oil in aqueous phase catalytic mode

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Effect test

Embodiment 1

[0039] Embodiment 1, the method and effect of upgrading the quality of fast pyrolysis oil a

[0040] 1) Please refer to Figure 1, take 200g of biomass rapid pyrolysis oil a (see Table 1 for physical properties) and put it into bio-oil storage tank 1, press H at normal temperature and pressure 2 Distilled water was added at a mass ratio of O: bio-oil of 10:1, stirred for 12 hours, cooled and left at -2°C for 12 hours, precipitated and filtered to obtain water-soluble components and water-insoluble components.

[0041] 2) After taking out the water-insoluble component, put it into the acid hydrolysis reactor 4, close the back pressure valve 2, and add THF and distilled water according to the mass ratio of the water-insoluble component, tetrahydrofuran THF, and water 2:2:1, and add HCl adjusts the pH value of the solution below 2, covers the reactor 4 upper cover and uses N 2 After replacing the air, pressurize the reactor 4 to 0.8MPa, turn on the agitator a3, raise the temperat...

Embodiment 2

[0047] Embodiment 2, the upgrading method and effect of rapid pyrolysis oil b

[0048] The rapid pyrolysis oil b was upgraded using the same experimental device and process as in Example 1. The physical properties of the pyrolysis oil b are shown in Table 1.

[0049] Step 1), 2), 3), 4) are the same as Example 1, change step 5) reaction conditions, in the first step hydrogenation, H 2 The pressure was adjusted to 2MPa, and the rest remained unchanged, and the step 6) of the same reaction conditions as in Example 1 was carried out to obtain the physical property results of the liquid phase product as shown in Table 2. After analysis, the oxygen content of the product oil was reduced to 3.2%, the H / C ratio was 1.42, the pH value was 5.0, and the C in the oil 7 -C 15 The mass fraction of linear alkanes is 74%. Compared with the quality of the oil product obtained in Example 1, the quality of the oil product is slightly reduced, which can be attributed to the following two rea...

Embodiment 3

[0050] Embodiment 3, the upgrading method and effect of slow pyrolysis oil c

[0051] The slow pyrolysis oil c was upgraded using the same experimental device and process as in Example 1. The physical properties of the pyrolysis oil c are shown in Table 1.

[0052] All steps and reaction conditions are the same as in Example 1, and the results of the physical properties of the liquid phase product are shown in Table 2. After analysis, the oxygen content of the product oil was reduced to 1.5%, the H / C ratio was 1.64, the pH value was 5.2, and the C in the oil 7 -C 15 The mass fraction of linear alkanes is 80%.

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Abstract

The invention provides a method for preparing liquid alkane fuel by upgrading bio-oil in an aqueous phase catalytic mode. The method comprises the following steps of: 1) pretreating the bio-oil to obtain a water-soluble component and a water-insoluble component; 2) performing a pressurized acid hydrolysis process on a furan compound of the water-insoluble component to prepare the furan compound; 3) performing a reforming and hydrogen production reaction on the water-soluble component; 4) mixing the furan compound with a liquid-phase product separated from the step 3) to perform an aldol condensation reaction to increase carbon chains; and 5) performing a hydrogenation and dehydration reaction on an aldol condensation product to obtain liquid linear alkane. The method has the advantages that: an upgrading process, which is performed in a double-phase system, can effectively contribute to the desorption of an intermediate product from the surface of a catalyst and the mass transfer of an upgraded product, and can reduce the risk of carbon deposition on the surface of the catalyst; the quality of oil obtained by the method is high; the energy density and the energy grade of the bio-oil are improved greatly; and the liquid alkane fuel can be obtained from all kinds of bio-oil so as to partially substitute for the conventional widely-used fossil gasoline and diesel oil fuel.

Description

technical field [0001] The invention relates to the fields of chemical technology and biomass utilization, in particular to a method for preparing liquid alkane fuel by water-phase catalytic upgrading of biological oil. technical background [0002] Biomass is the only renewable energy that can produce liquid products. The research on producing liquid fuel oil from biomass began in the oil crisis in the mid-1970s. The main processes are fast pyrolysis, slow pyrolysis and hydrothermal liquefaction. Its liquid product, bio-oil, is a dark brown liquid with a strong smoky smell. It has the following characteristics: 1) high water content, accounting for about 15-30%; 2) high oxygen content, accounting for about 35-40% (The oxygen content obtained by hydrothermal liquefaction of biomass is low, about 20%); 3) High acid content; 4) The composition is complex. Therefore, the calorific value of bio-oil is only about 30-50% of that of gasoline. It has high solid content and poor uni...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02P30/20
Inventor 谢建军阴秀丽吴创之
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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