Method for directionally preparing aromatic hydrocarbon through co-pyrolysis of biomass and plastic

A biomass and co-pyrolysis technology, applied in the field of biomass resource utilization, can solve the problems of affecting the mass transfer and heat transfer of pyrolysis, difficulty in ensuring synergistic pyrolysis, uneven raw materials, etc., so as to strengthen interaction and improve selection. The effect of increasing the yield of aromatic hydrocarbons

Active Publication Date: 2021-02-02
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

This method uses traditional mechanical methods to mix raw materials, resulting in uneven raw materials and loose contact, which affects mass transfer and heat transfer in the pyrolysis process, and only one-step catalytic co-pyrolysis technology is only for cellulose, which is difficult to ensure Synchronization of lignin and hemicellulose with plastics for maximum synergistic pyrolysis

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  • Method for directionally preparing aromatic hydrocarbon through co-pyrolysis of biomass and plastic

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Embodiment 1

[0061] This embodiment provides a method for the directional preparation of aromatics by co-pyrolysis of biomass and plastics. The process flow diagram of the method is as follows figure 1 shown.

[0062] The method comprises the steps of:

[0063] (1) Put the fruit shell and low-density polyethylene plastic in a preheater at a mass ratio of 1:1, melt and blend them at 170°C, and then heat press them at 0.5MPa. Crushing and granulating after cooling to obtain biomass / plastic composite molding raw materials;

[0064] (2) The biomass / plastic composite molding raw material obtained in step (1) is subjected to low-temperature pyrolysis treatment at 550°C to obtain a low-temperature gas phase product containing the first pyrolysis oil vapor and the first pyrolysis gas and the first Solid-phase product; the low-temperature pyrolysis gas-phase product is subjected to a catalytic conversion reaction through a HZSM-5 molecular sieve catalyst bed at 750°C, and aromatic first hydrocarb...

Embodiment 2

[0068] This embodiment provides a method for the directional preparation of aromatics by co-pyrolysis of biomass and plastics, the method comprising the following steps:

[0069] (1) Put the straw and polyvinyl chloride plastic in the preheater according to the mass ratio of 1:0.1, carry out melt blending under the condition of 220°C, and then hot press molding under the condition of 0.1MPa, after cooling After crushing and granulating, biomass / plastic composite molding raw materials are obtained;

[0070] (2) The biomass / plastic composite molding raw material obtained in step (1) is subjected to low-temperature pyrolysis treatment at 600°C to obtain a low-temperature gas phase product containing the first pyrolysis oil vapor and the first pyrolysis gas and the first Solid-phase product; the low-temperature pyrolysis gas-phase product is subjected to a catalytic conversion reaction through a ZSM-5 molecular sieve catalyst bed at 700°C, and aromatic first hydrocarbon oil is obt...

Embodiment 3

[0074] This embodiment provides a method for the directional preparation of aromatics by co-pyrolysis of biomass and plastics, the method comprising the following steps:

[0075] (1) Put sawdust and polyvinyl chloride plastic in a preheater with a mass ratio of 1:10, melt and blend them at 120°C, and then heat press them at 5MPa. After cooling, Carry out crushing and granulation to obtain biomass / plastic composite molding raw materials;

[0076] (2) The biomass / plastic composite molding raw material obtained in step (1) is subjected to low-temperature pyrolysis treatment at 450°C to obtain a low-temperature gas phase product containing the first pyrolysis oil vapor and the first pyrolysis gas and the first Solid-phase product; the low-temperature pyrolysis gas-phase product is subjected to a catalytic conversion reaction through a HZSM-5 molecular sieve catalyst bed at 500°C, and aromatic first hydrocarbon oil is obtained after condensation and oil-water separation;

[0077] ...

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Abstract

The invention provides a method for directionally preparing aromatic hydrocarbon through co-pyrolysis of biomass and plastic. The method comprises the following steps: firstly, carrying out melt blending, crushing and granulation on the biomass and the plastic to obtain a homogenized material; secondly, sequentially carrying out low-temperature pyrolysis and catalytic conversion on the homogenizedmaterial to obtain first aromatic hydrocarbon oil, and activating a lignin structure in the biomass; and finally, sequentially carrying out pyrolysis and catalytic conversion on the activated ligninand the residual plastic at high temperature to obtain second aromatic hydrocarbon oil. According to the method disclosed by the invention, the process of preparing the aromatic hydrocarbon from biomass/plastic is strengthened by virtue of a raw material composite molding and step-by-step pyrolysis method, so that the aromatic hydrocarbon product with high yield and high selectivity is obtained, and the method has a relatively good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of biomass resource utilization, and in particular relates to a method for co-pyrolysis and directional preparation of aromatic hydrocarbons from biomass and plastics. Background technique [0002] The depletion of fossil fuels and the prominence of environmental problems have greatly promoted the development of renewable energy. The preparation of aromatics by catalytic pyrolysis of biomass is of great significance for alleviating energy shortage and ensuring national energy security. However, due to the hydrogen-poor characteristics of raw materials, biomass is easy to coke and cause catalyst deactivation in the thermal conversion process alone, and the pyrolysis oil has high oxygen content, resulting in high acidity, strong corrosion and low calorific value, which limits its industrial development. [0003] Compared with biomass pyrolysis alone, the catalytic co-pyrolysis technology of biomass and "hydrogen-rich" p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/00C10B53/07C10B53/02
CPCC10G1/00C10B53/07C10B53/02Y02P20/143Y02E50/10
Inventor 惠贺龙李松庚于冬雪丁广超董宁
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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