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A method for preparing low-carbon olefins from biomass

A technology of biomass raw materials and low-carbon olefins, which is applied in the field of biomass resource conversion and utilization, and can solve the problem of low product yield

Active Publication Date: 2021-05-14
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The products of the existing biomass catalytic pyrolysis process are mainly aromatics, and the yield of low-carbon olefins is low, usually as a by-product of the preparation of aromatics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1: Continuously add pine sawdust raw materials with a particle range of 0.4-1.4mm into the fluidized bed pyrolysis reactor maintained at a pyrolysis temperature of 550°C, and maintain the mass space velocity of biomass raw materials relative to the catalyst at 1.33h -1 , the composition of the carrier gas in the pyrolysis reactor is 60vol% water vapor + 40vol% nitrogen, and the biomass undergoes rapid pyrolysis reaction inside the pyrolysis reactor to generate gaseous pyrolysis steam;

[0022] Step 2, keep the mixed steam composed of pyrolysis steam and carrier gas at the pyrolysis temperature for 5 seconds, and perform high-temperature dust removal;

[0023] Step 3, the mixed steam after dedusting is passed into a fixed-bed catalytic reactor maintained at a catalytic temperature of 550°C, and the catalytic reaction is carried out under the action of a hydrogen-type ZSM-5 catalyst activated by water vapor, and the product is condensed at 0°C to obtain A gaseous pro...

Embodiment 2

[0026] Step 1: Continuously add pine sawdust raw materials with a particle range of 0.4-1.4mm into the fluidized bed pyrolysis reactor maintained at a pyrolysis temperature of 550°C, and maintain the mass space velocity of biomass raw materials relative to the catalyst at 1.33h -1 , the composition of the carrier gas in the pyrolysis reactor is 60vol% water vapor + 40vol% nitrogen, and the biomass undergoes rapid pyrolysis reaction inside the pyrolysis reactor to generate gaseous pyrolysis steam;

[0027] Step 2, keep the mixed steam composed of pyrolysis steam and carrier gas at the pyrolysis temperature for 5 seconds, and perform high-temperature dust removal;

[0028] Step 3, the mixed steam after dedusting is passed into a fixed-bed catalytic reactor maintained at a catalytic temperature of 550°C, and the catalytic reaction is carried out under the action of a hydrogen-type ZSM-5 catalyst, and the product is condensed at 0°C to obtain low-carbon olefins gaseous products. ...

Embodiment 3

[0031] Step 1: Continuously add pine sawdust raw materials with a particle range of 0.4-1.4mm into the fluidized bed pyrolysis reactor maintained at a pyrolysis temperature of 550°C, and maintain the mass space velocity of biomass raw materials relative to the catalyst at 1.33h -1 , the composition of the carrier gas in the pyrolysis reactor is 40vol% water vapor + 60vol% nitrogen, and the biomass undergoes rapid pyrolysis reaction inside the pyrolysis reactor to generate gaseous pyrolysis steam;

[0032] Step 2, keep the mixed steam composed of pyrolysis steam and carrier gas at the pyrolysis temperature for 5 seconds, and perform high-temperature dust removal;

[0033] Step 3, the mixed steam after dedusting is passed into a fixed-bed catalytic reactor maintained at a catalytic temperature of 550°C, and the catalytic reaction is carried out under the action of a hydrogen-type ZSM-5 catalyst, and the product is condensed at 0°C to obtain low-carbon olefins gaseous products. ...

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Abstract

The invention discloses a method for preparing low-carbon olefins using biomass as a raw material, which belongs to the field of biomass resource conversion and utilization, and includes the following steps: step 1, continuously adding biomass raw materials and keeping them at the pyrolysis temperature and continuing to pass through In the pyrolysis reactor containing a certain amount of water vapor carrier gas, the biomass undergoes rapid pyrolysis reaction to generate gaseous pyrolysis steam; step 2, the mixed steam composed of pyrolysis steam and carrier gas is kept at the pyrolysis temperature for a period of time. Time, and carry out high-temperature dedusting; step 3, the mixed steam after dedusting is passed into the catalytic reactor kept at the catalytic temperature, and the catalytic reaction is carried out under the action of the ZSM‑5 catalyst, and the product is condensed to obtain a low-carbon olefin-rich gaseous product. The technical scheme provided by the invention solves the problem of low yield of low-carbon olefins in the current biomass catalytic pyrolysis technology, realizes the high-selectivity transformation of biomass to prepare low-carbon olefins, and provides high-value utilization of biomass resources A new way is provided.

Description

technical field [0001] The invention belongs to the field of transformation and utilization of biomass resources, and in particular relates to a method for preparing low-carbon olefins by using biomass as a raw material. Background technique [0002] Low-carbon olefins refer to olefins with 2 to 4 carbon atoms, such as ethylene, propylene, butene, etc., which are widely used in the production of plastics, fibers, etc., and are the most basic raw materials for petrochemical production. At present, the preparation of low-carbon olefins is highly dependent on fossil energy such as oil and natural gas. The non-renewability of fossil energy and the greenhouse gas emissions caused by the consumption of fossil energy have brought huge challenges to the sustainable development of the low-carbon olefin industry. It has become an inevitable trend to develop clean and sustainable low-carbon olefins preparation methods. [0003] Biomass refers to various organisms formed through photos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/02C10G2/00C10K1/02
CPCC10B53/02C10G2/334C10G2300/1092C10K1/02Y02E50/10Y02E50/30
Inventor 肖睿胡昌淞刘超张会岩吴石亮雷鸣
Owner SOUTHEAST UNIV
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