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New method for preparing fuel oil by co-pyrolysis of biomass and waste plastic

A technology of waste plastics and biomass, which is applied in the preparation of liquid hydrocarbon mixtures and the petroleum industry, etc., can solve the problems of harsh conditions for the cracking reaction of plastics alone, and achieve the effects of alleviating energy crisis, solving environmental problems, and convenient operation

Active Publication Date: 2014-12-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the shortcomings of insufficient hydrogen supply for fuel oil produced by biomass cracking alone and harsh reaction conditions for separate cracking of plastics, and combine the green environmental protection and renewable characteristics of the development and application of biomass resources with the recycling of plastic waste. Combined, a method for preparing fuel oil by co-pyrolysis of biomass and waste plastics was proposed

Method used

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  • New method for preparing fuel oil by co-pyrolysis of biomass and waste plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 0.6 kg of sawdust and 0.4 kg of PP particles according to the mass ratio of 3:2, mix them evenly, and add them to the fixed bed reactor through a screw feeder, and pass the carrier gas argon, the residence time of the gas is 7s, After equilibrating for 30min, start heating, the temperature rises to 450°C, the reaction time is 2h, the oil gas generated by the pyrolysis reaction enters the refining tower, the catalyst is SAPO-31 molecular sieve, and the amount of the catalyst is 10% of the total amount of raw materials, i.e. 100g. After the catalytic upgrading is completed in the refining tower, the obtained liquid product enters the rectifying tower for rectification and separation to obtain fuel oils of different fractions, and the fuel oils include gasoline, diesel oil and heavy diesel oil. The gas products and solid residues obtained by rectification in the rectification tower are directly returned to the fixed-bed reactor for recycling, and finally the specific ...

Embodiment 2

[0033] Weigh 0.5kg of sawdust and 0.5kg of HDPE granules according to the mass ratio of 1:1, mix them evenly, and then add them to the fixed-bed reactor through a screw feeder, pass the carrier gas argon, and the residence time of the gas is 7s. After equilibrating for 30 minutes, start heating, the temperature rises to 450°C, and the reaction time is 2.5 hours. The oil gas produced by cracking enters the refining tower. The catalyst is SBA-15 molecular sieve, and the amount of catalyst is 10g. After catalytic upgrading is completed in the refining tower, The obtained liquid product enters the rectification tower for rectification and separation to obtain fuel oils of different fractions, which include gasoline, diesel oil and heavy diesel oil. The gas products and solid residues obtained by rectification in the rectification tower are directly returned to the fixed-bed reactor for recycling, and finally the specific gravity of fuel oil is 0.854, the yield of oil is 58%, and th...

Embodiment 3

[0035] According to the mass ratio of 1:1, weigh 0.5kg of straw and 0.5kg of PP particles, mix them evenly, and add them into the fixed bed reactor through a screw feeder, and pass the carrier gas argon, and the residence time of the gas is 7s. After equilibrating for 30 minutes, start heating, the temperature rises to 480°C, and the reaction time is 3 hours. The oil gas generated by cracking enters the refining tower. The catalyst is FCC catalyst, and the amount of catalyst is 10g. After the catalytic upgrading is completed in the refining tower, the obtained liquid The product enters the rectification tower for rectification and separation to obtain fuel oils of different fractions, which include gasoline, diesel oil and heavy diesel oil. The gaseous products and solid residue obtained by rectification in the rectification tower are directly returned to the fixed-bed reactor for recycling, and finally the specific gravity of fuel oil is 0.836, the yield of oil is 63%, and the...

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Abstract

The invention discloses a new method for preparing fuel oil by co-pyrolysis of biomass and waste plastic, belonging to the field of solid waste disposal and utilization technology and biomass energy. The method comprises the following steps: mixing evenly the biomass and the waste plastic according to a certain ratio; placing the mixture in a pyrolysis reactor; heating the mixture to the needed pyrolysis temperature for a pyrolytic reaction; introducing the gas generated from the pyrolysis into a refined reaction tower for catalytic reforming; carrying out rectification on the reformed liquid product to obtain fuel oil with different cut fractions; and returning a small quantity of the combustible gas and the residues to the pyrolysis reactor for burning and being used as supplementary heat source. In the method, the biomass and the waste plastic are comprehensively utilized in co-pyrolysis and synergetic promotion is generated by the biomass and the waste plastic, so that the oil productivity and the oil quality are improved. The novel method not only resolves the environmental problems caused by white pollution, but also relieves the energy crisis caused by petrochemical resource exhaustion, thereby having wide application prospect and being able to generate huge social and economic benefits.

Description

technical field [0001] The invention belongs to the field of solid waste treatment and utilization technology and biomass energy, in particular to a method for preparing fuel oil by co-pyrolysis of biomass and waste plastics. Background technique [0002] Today, when non-renewable fossil resources such as oil and natural gas are on the verge of depletion and environmental pollution is becoming more and more serious, energy demand and environmental protection have become two major themes in the world today. The amount of domestic waste in China is huge. In more developed cities, waste plastics account for 8% to 15% of the total mass of waste, and the volume fraction reaches about 30%. The traditional treatment methods of waste plastics are landfill and incineration, but this has caused a series of problems such as occupying cultivated land, polluting water sources and emitting a large amount of waste gas. Thermochemical recycling methods such as pyrolysis convert waste plast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/00
Inventor 吴玉龙陈宇杨明德党杰华德润胡湖生陈镇刘吉
Owner TSINGHUA UNIV
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