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A method for preparing aromatic compounds by rapid pyrolysis gas-phase reforming of crustacean biomass

A technology for aromatic compounds and biomass, which is applied in the field of rapid pyrolysis gas-phase reforming of shell biomass to prepare aromatic compounds, can solve the problems of small pore size, catalyst deactivation, and many steps, so as to improve the efficiency of gas-phase reforming and change the Pyrolysis reaction pathway, the effect of product uniformity

Active Publication Date: 2018-06-26
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the yield of aromatic compounds in biomass fast pyrolysis products is very low, and adding an appropriate catalyst can greatly increase its yield
At present, the commonly used catalyst is ZSM-5, whose pore size is small, which is not conducive to the entry and exit of molecules above C10. In order to improve the product yield, the catalyst ZSM-5 needs to be pore-enlarged, and the process is more cumbersome and complicated.
In order to increase the yield of aromatic hydrocarbons, the conventional method is to condense the bio-oil and then carry out the refining and reforming reaction. Although the method is not complicated, there are many steps, which are time-consuming and energy-consuming. The macromolecules in the decomposed bio-oil that cannot enter and exit the pores of the catalyst will coke on the outer surface of the catalyst, forming carbon, leading to catalyst deactivation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put 1g of walnut shells into the reaction device with 1g of catalyst Bi-Ce-SBA-15 in advance, and use asbestos to separate the walnut shells from the catalyst. The total mass of the two metals accounts for 0.2% of the mass of catalyst SBA-15. %, under a nitrogen atmosphere, the temperature was raised to 500°C at a rate of 500°C / s, and the hydrogen-donating solvent 9,10 dihydroanthracene vapor was introduced at a rate of 2ml / min, and the catalytic pyrolysis reforming reaction was carried out for 2s, and the obtained pyrolysis The catalytic gas is condensed to obtain a liquid product rich in aromatic compounds. Aromatic compounds accounted for 18.5% by mass of liquid products rich in aromatic compounds, including 1.8% benzene, 4.6% toluene and 12.1% xylene.

Embodiment 2

[0031] 1g coconut shell is loaded into the reaction device that 5g catalyst Ir-Pd-SBA-15 is placed in advance, and adopts asbestos that coconut shell is separated from catalyst, the total mass of the loading of two kinds of metals accounts for 4% of catalyst SBA-15 quality. %, under a nitrogen atmosphere, the temperature was raised to 1000°C at a rate of 1000°C / s, and the hydrogen-donating solvent tetrahydronaphthalene steam was introduced at a rate of 2ml / min to carry out catalytic pyrolysis reforming reaction for 2s, and the obtained pyrolysis catalytic gas was passed through Condensation gives a liquid product rich in aromatic compounds. Aromatic compounds accounted for 28.4% of the liquid product rich in aromatic compounds, including 5.7% benzene, 8.1% toluene and 14.6% xylene.

Embodiment 3

[0033]Put 1g of hazelnut shells into the reaction device with 2g catalyst Zn-Nb-SBA-15 in advance, and use asbestos to separate the hazelnut shells from the catalyst. The total mass of the two metals accounts for 1.2% of the catalyst SBA-15 mass. %, under a nitrogen atmosphere, the temperature was raised to 500°C at a rate of 500°C / s, and the hydrogen-donating solvent 9,10 dihydroanthracene vapor was introduced at a rate of 2ml / min, and the catalytic pyrolysis reforming reaction was carried out for 2s, and the obtained pyrolysis The catalytic gas is condensed to obtain a liquid product rich in aromatic compounds. Aromatic compounds accounted for 25.8% by mass of liquid products rich in aromatic compounds, including 4.3% benzene, 9.8% toluene and 11.7% xylene.

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Abstract

The invention relates to a method for preparing an aromatic compound through fast pyrolysis gas-phase reforming of shell biomass and belongs to the technical field of biomass energy utilization. The method specifically includes the steps that the shell biomass raw materials with the grain size ranging from 0.3 micrometer to 0.5 micrometer are put in a reaction device in which a catalyst is put in advance, hydrogen-donor solvent steam is introduced in the nitrogen atmosphere, a catalytic pyrolysis reforming reaction is carried out for 2 s at the temperature of 500-1,000 DEG C, catalytic pyrolysis gas is condensed, and then a liquid product containing the aromatic compound is obtained. The catalyst SBA-15 with the large hole diameter is adopted for loading Bi, Ce, Ir, Pd, Zn, Nb, Ag and other bi-metals, under the condition that tetrahydronaphthalene or 9,10-dihydro anthracene or other hydrogen-donor solvent steam is introduced, molecules of C10 or above can freely come in and go out of hole passages, meanwhile, the gas-phase reforming efficiency is further improved, and the yield of the aromatic compound is further increased.

Description

technical field [0001] The invention belongs to the technical field of biomass energy utilization, and in particular relates to a method for preparing aromatic compounds by quick pyrolysis gas phase reformation of shell biomass. Background technique [0002] Biomass pyrolysis oil production technology is a cutting-edge technology in the field of biomass thermochemical conversion and utilization, which can convert low-grade biomass energy into high-grade liquid fuel and high value-added products. In today's situation where oil resources tend to be tense and oil prices fluctuate frequently, carrying out relevant research on the technology of producing aromatic compounds by pyrolysis of biomass in time will help alleviate my country's dependence on oil imports as a net oil importer, and at the same time realize my country's production The efficient and renewable utilization of materials has important practical significance and huge economic benefits, and is in line with the stra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/06C07C15/04C07C15/06C07C15/08B01J29/03
CPCY02P20/52
Inventor 郑志锋郑云武黄元波杨晓琴刘灿
Owner SOUTHWEST FORESTRY UNIVERSITY