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Method for preparing bio-oil by catalytic pyrolysis of microalgae with high fat content by molecular sieve

A catalytic pyrolysis and molecular sieve technology, which is applied in the direction of biological raw materials, catalytic cracking, and liquid hydrocarbon mixture preparation, can solve the problems of high energy consumption and high operating costs of fluidized bed reactors, and achieve low energy consumption and good market application Foreground, the effect of low running cost

Inactive Publication Date: 2013-07-24
SICHUAN UNIV
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Problems solved by technology

Although this method obtains a higher yield of oil and gas, the fluidized bed reactor has high operating costs and high energy consumption, and the catalysts used are limited to rare earth Y-type molecular sieves and γ-Al 2 o 3

Method used

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  • Method for preparing bio-oil by catalytic pyrolysis of microalgae with high fat content by molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Nannochloropsis was collected, dried, crushed and sieved, and the microalgae powder with a particle size of less than 0.45mm was taken as the experimental raw material.

[0013] Take 1 gram of Nannochloropsis powder, fully mix it with 0.5 gram of HZSM-5 (microalgae powder: HZSM-5=2:1), and put it into a fixed-bed reactor. Nitrogen was used as the carrier gas, and the flow rate of the carrier gas was controlled at 30ml / min. Using an external electric furnace as a heat source, the descending fixed-bed reactor was raised from room temperature to 300°C at a rate of 10°C / min, and kept at this temperature for 1 hour. The gas generated in the reaction is taken out of the reactor by the carrier gas, and condensed in the condenser to obtain bio-oil. Finally, a bio-oil yield of 32% (mass fraction) was obtained.

Embodiment 2

[0015] Take 1 gram of Nannochloropsis powder, fully mix it with 0.75 gram of HZSM-5 (microalgae powder: HZSM-5=4:3), and put it into a fixed-bed reactor. Nitrogen was used as the carrier gas, and the flow rate of the carrier gas was controlled at 30ml / min. Using an external electric furnace as a heat source, the descending fixed-bed reactor was raised from room temperature to 400°C at a rate of 10°C / min, and kept at this temperature for 1 hour. The gas generated in the reaction is taken out of the reactor by the carrier gas, and condensed in the condenser to obtain bio-oil. Finally, a bio-oil yield of 53% (mass fraction) was obtained.

Embodiment 3

[0017] Take 1 gram of Nannochloropsis powder, fully mix it with 1 gram of HZSM-5 (microalgae powder: HZSM-5=1:1), and put it into a fixed-bed reactor. Nitrogen was used as the carrier gas, and the flow rate of the carrier gas was controlled at 40ml / min. Using an external electric furnace as a heat source, the descending fixed-bed reactor was raised from room temperature to 500°C at a rate of 10°C / min, and kept at this temperature for 1 hour. The gas generated in the reaction is taken out of the reactor by the carrier gas, and condensed in the condenser to obtain bio-oil. Finally, a bio-oil yield of 41% (mass fraction) was obtained.

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Abstract

In a method for preparing bio-oil by catalytic pyrolysis of microalgae with high fat content by a molecular sieve, HZSM-5, MCM-48 or HY molecular sieve is taken as a catalyst, and the catalytic pyrolysis of the microalgae with high fat content is realized in a down-flow fixed bed reactor. Compared with lignocellulose biomass, the temperature for the catalytic pyrolysis of the microalgae with highfat content is lower, and the yield and the quality of the obtained bio-oil are higher, thereby being very conductive to energy-saving and high efficient production of the bio-oil; furthermore, the composition of the bio-oil can be changed by changing the catalyst, thereby meeting the different market demands and having great market application prospect.

Description

technical field [0001] The invention belongs to a method for preparing bio-oil by catalyzing and pyrolyzing microalgae with high lipid content by molecular sieves. Background technique [0002] With the depletion of fossil energy and people's increasing concern about the environmental problems caused by its use, bioenergy prepared from recyclable biomass as an important green energy has attracted widespread attention from all over the world. Some western developed countries, such as the United States, have carried out research on bioenergy early on with their advantages in resources and technology, and have achieved certain results. my country is a country rich in biomass resources, and a large amount of biomass is produced every year in agriculture and forestry. However, traditional biomass utilization methods (such as direct combustion) not only have low economic benefits, but also cause great harm to the environment. [0003] Pyrolysis is a thermochemical conversion meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G11/05C10G3/00
CPCY02P30/20
Inventor 胡常伟潘攀杨文衍李越嵩童冬梅祝良芳李桂英
Owner SICHUAN UNIV
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