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A method for directional preparation of aromatics by pyrolysis of biomass and plastic waste

A biomass pyrolysis and biomass technology, which is used in the preparation of liquid hydrocarbon mixtures, the treatment of hydrocarbon oil, and hydrocarbon oil treatment products, etc., can solve the problems of poor tunability of reaction parameters, low yield of target products, and easy coking of catalysts, etc. problems, to achieve good environmental and economic benefits, improve yield and selectivity, and prolong catalyst life.

Active Publication Date: 2018-02-13
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to propose a biomass and plastic waste cocatalyzed pyrolysis process, such as the catalyst is easy to coke, the target product yield is low, and the reaction parameters are poorly adjustable. A method for the directional preparation of aromatics by pyrolysis, which can obtain aromatics products with higher conversion rate and selectivity, and realize the directional conversion of biomass and plastic waste to high value-added fuels and chemicals

Method used

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  • A method for directional preparation of aromatics by pyrolysis of biomass and plastic waste

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Experimental program
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Effect test

Embodiment 1

[0034] First, the biomass (straw) is pyrolyzed in a pyrolysis reactor at 700°C and 10MPa to produce biomass pyrolysis products mainly composed of macromolecular oxygenates; at the same time, the plastic waste (polyethylene plastic ) is pyrolyzed in a pyrolysis reactor at 400°C under normal pressure to form plastic pyrolysis products mainly composed of long-chain hydrocarbon compounds; wherein, the feed mass ratio of biomass to plastic waste is biomass : Plastic = 1:10. Secondly, the biomass pyrolysis product is passed through the ZrO in the catalytic cracking reactor 2 Based on super strong solid acid catalyst bed, under the condition of 700℃, 10Mpa, catalyst:biomass = 1:10, the primary catalytic cracking is carried out to form primary catalytic cracking products of biomass mainly composed of small molecule oxygen-containing compounds; at the same time Pass the plastic pyrolysis product through SiO in the catalytic cracking reactor 2 ·Al 2 o 3 The catalyst bed is subjected...

Embodiment 2

[0036] The present embodiment adopts the same experimental method and steps as in Example 1, the difference is:

[0037] The feed ratio of biomass (rice husk) and plastic waste (polyvinyl chloride) is biomass: plastics=10:1;

[0038] Biomass pyrolysis reaction conditions are 350°C and normal pressure;

[0039] The pyrolysis reaction conditions of plastic waste are 900°C and 10MPa;

[0040] The primary catalytic cracking reaction of biomass pyrolysis products uses Fe 2 o 3 Based on a super strong solid acid catalyst, the reaction conditions are 300 ° C, normal pressure, catalyst: biomass = 10:1;

[0041] One-stage catalytic cracking reaction of plastic waste pyrolysis products using γ-Al 2 o 3 Catalyst, the reaction conditions are 700°C, 10Mpa, catalyst: plastic waste = 1:10;

[0042] The reaction condition of the secondary shape-selective catalytic reaction of the mixture of the primary catalytic cracking product of biomass and the pyrolysis product of primary cracking o...

Embodiment 3

[0044] The present embodiment adopts the same experimental method and steps as in Example 1, the difference is:

[0045] The feed ratio of biomass (wood chips) to plastic waste (polystyrene) is biomass: plastic = 1:1;

[0046] Biomass pyrolysis reaction conditions are 550°C, 5MPa;

[0047] The pyrolysis reaction conditions of plastic waste are 550°C and 5MPa;

[0048] The primary catalytic cracking reaction of biomass pyrolysis products uses SiO 2 ·Al 2 o 3 Catalyst, the reaction conditions are 550°C, 5MPa, catalyst: biomass = 1:1;

[0049] The primary catalytic cracking reaction of plastic waste pyrolysis products uses CaO catalyst, the reaction conditions are 550 ° C, 5 MPa, catalyst: plastic waste pyrolysis products = 1:1;

[0050] The reaction condition of the secondary shape-selective catalytic reaction of the mixture of the primary catalytic cracking product of biomass and the primary catalytic cracking product of plastic is 550° C., 5 MPa, catalyst: (biomass + plas...

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Abstract

The invention belongs to the field of biomass energy conversion and solid waste resource utilization, in particular to a method for directionally preparing aromatic hydrocarbons by means of pyrolysis of biomass and plastic waste. The method comprises the steps that the biomass and the plastic waste are subjected to pyrolysis separately; selective catalysis (primary catalysis) is conducted on pyrolysis products of the biomass and the plastic waste, macromolecular oxygenated compounds and long chain hydrocarbon substances which are relatively indolent and prone to coking in the products are selectively converted into micromolecular oxygenated compounds and short straight-chain olefins which are higher in activity; aromatic hydrocarbon products which are high in yield and selectivity are obtained by means of a shape selective catalytic reaction (secondary catalysis) of active micromolecular compounds on a molecular sieve catalyst, the coking deactivation rate of the catalyst is effectively decreased, and the catalyst life is prolonged. The method for directionally preparing the aromatic hydrocarbons by means of pyrolysis of the biomass and the plastic waste provides a novel approach for preparation of biomass-based aromatic hydrocarbon products.

Description

technical field [0001] The invention belongs to the fields of biomass energy conversion and solid waste resource utilization, and in particular relates to a method for preparing aromatic hydrocarbons through pyrolysis of biomass and plastic waste. Background technique [0002] Biomass, as a renewable and carbon-neutral energy source, its rational development and utilization will help alleviate the problems of resource scarcity and environmental pollution in China, and is of great significance to the sustainable development of my country's economy and society. Biomass can be converted into high value-added fuels and chemical industrial raw materials through pyrolysis, and there is basically no NO production in the thermal conversion process x , SO 2 and other pollutants, while also achieving CO 2 Therefore, biomass pyrolysis is considered to be an effective way to replace fossil energy. [0003] Aromatic chemicals, as an important basic raw material for a class of chemical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/00
CPCC10G1/00C10G1/002C10G2300/1003C10G2300/1011C10G2300/1014C10G2400/30
Inventor 李松庚惠贺龙宋文立贺璐
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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