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Method for simultaneously preparing high-quality bio-oil and high-performance mercury removal adsorbent from city solid wastes

An adsorbent, high-quality technology, applied in chemical instruments and methods, separation methods, biofuels, etc., can solve the problems of unfavorable mercury removal reaction, blockage of biocoke pore structure, reduction of specific surface area and pore volume, etc., to reduce environmental pollution Contamination, release reduction, viscosity reduction effects

Active Publication Date: 2020-09-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, after further research, it was found that the process still has the following problems: (1) During the co-pyrolysis of biomass and halogen-containing plastics, more halogen gases such as HCl and HBr will still be released; Oil contains a lot of halogens, so it cannot be directly used as fuel or chemical raw materials, and further dehalogenation treatment is required; (3) During the co-pyrolysis process of biomass and halogen-containing plastics, the pyrolysis residues of plastics will cause the pore structure of biochar to deteriorate. (4) After co-pyrolysis of biomass and halogen-containing plastics, chlorine / bromine in halogen-containing plastics will be converted into halogen ions (Cl - / Br - ) and organic halogens (C-Cl / C-Br) exist in biocoke, and part of the biocoke adsorbent after mercury removal and inactivation is sent to landfill for accumulation or landfill disposal, rainwater washing or immersion It is easy to cause the leaching and release of halogen ions, causing groundwater or soil pollution

Method used

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  • Method for simultaneously preparing high-quality bio-oil and high-performance mercury removal adsorbent from city solid wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1. Crushing and screening waste wood and bamboo and PVC plastics, and selecting wood powder and PVC powder with a particle size of 50 μm to 150 μm for future use.

[0040] Step 2. Mix PVC and wood and bamboo evenly in a ratio of 1:4, then add calcium oxide according to the molar ratio of calcium to chlorine of 2.5, and fully mix the three experimental raw materials evenly.

[0041] Step 3. Put the experimental sample gained in step 2 into the horizontal pyrolysis furnace, and pass into 200ml / min of N 2 As a protective gas, when the pyrolysis furnace rises to 600°C, it starts to pyrolyze and keep it for 20min, then in N 2 Cool to room temperature under atmosphere.

[0042] Step 4. Putting the solid sample obtained in Step 3 into water, stirring thoroughly, and then filtering, and drying the filtered solid to obtain a mercury-removing biocoke adsorbent.

[0043] The specific surface area of ​​the prepared biochar adsorbent is 223.68m 2 / g, the pore volume is 2.02c...

Embodiment 2

[0045] Step 1. Crushing and screening the paper and PVC plastic, and selecting paper powder and PVC powder with a particle size of 100 μm to 200 μm for future use.

[0046] Step 2. Mix PVC and paper evenly in a ratio of 1:10, then add calcium carbonate according to the molar ratio of calcium to chloride as 1, and mix the three experimental raw materials well.

[0047] Step 3. Put the experimental sample obtained in step 2 into a horizontal pyrolysis furnace, and pass into 150ml / min of CO 2 As a protective gas, when the pyrolysis furnace rises to 700°C, it starts pyrolysis and keeps it for 30 minutes, and then in CO 2 Cool to room temperature under atmosphere.

[0048] Step 4. Putting the solid sample obtained in Step 3 into water, stirring thoroughly, and then filtering, and drying the filtered solid to obtain a mercury-removing biocoke adsorbent.

[0049] The specific surface area of ​​the prepared biochar adsorbent is 116.56m 2 / g, the pore volume is 1.03cm 3 / g, the rel...

Embodiment 3

[0051] Step 1. Crushing and screening waste wood and bamboo and computer plastic casings, and selecting wood and bamboo powder and computer plastic casing powder with a particle size of 20 μm to 50 μm for future use.

[0052] Step 2. Mix the plastic shell of the computer with wood and bamboo in a ratio of 1:6, then add calcium hydroxide according to the molar ratio of calcium to chloride of 3, and fully mix the three experimental materials evenly.

[0053] Step 3. Put the experimental sample gained in step 2 into the horizontal pyrolysis furnace, and pass into 200ml / min of N 2 As a protective gas, when the pyrolysis furnace rises to 700°C, it starts to pyrolyze and keep it for 30min, then in N 2 Cool to room temperature under atmosphere.

[0054] Step 4. Putting the solid sample obtained in Step 3 into water, stirring thoroughly, and then filtering, and drying the filtered solid to obtain a mercury-removing biocoke adsorbent.

[0055] The specific surface area of ​​the prepa...

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Abstract

The invention discloses a method for simultaneously preparing high-quality bio-oil and a high-performance mercury removal adsorbent from city solid waste. The preparation method comprises the following steps: mixing biomass / biomass waste, halogen-containing plastic and a calcium-based substance, carrying out pyrolysis; washing a solid product obtained by pyrolysis with water, filtering, and dryingto obtain the mercury removal adsorbent. The generation of CaCl2 / CaBr2 in the co-pyrolysis process can reduce the activation energy required by an original pyrolysis reaction; precipitation and release of more volatile components are promoted; a pyrolysis reaction path is changed; the pore structure of the generated adsorbent becomes more developed, and the mercury removal active sites on the surface of the adsorbent becomes richer, such that the mercury removal reaction can be easily performed, the quality and the yield of the bio-oil can be substantially improved through the interaction, and the bio-oil and the pyrolysis gas do not contain halogen so as to easily achieve the commercial use of the pyrolysis product.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of urban solid waste, and in particular relates to a method for simultaneously preparing high-quality bio-oil and high-performance mercury-removing adsorbent from urban solid waste. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The output of municipal solid waste (MSW) in my country is increasing year by year. The annual output increased from 31.32 million tons in 1980 to 178.6 million tons in 2014, with an average annual growth rate of 5.5%. It is estimated that the output of municipal solid waste will reach 480 million tons. MSW can be divided into organic solid waste and inorg...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C10B53/02C10B53/07C10B57/06C10G1/00C10G1/10B01D53/02
CPCB01D53/02B01D2257/602B01D2258/0283B01J20/046B01J20/20B01J2220/4806B01J2220/4825B01J2220/4875B01J2220/4893C10B53/02C10B53/07C10B57/06C10G1/00C10G1/10C10G2300/1003C10G2300/1011C10G2300/1014Y02E50/10Y02P20/143
Inventor 许洋张庆竹杜林徐菲李延伟张世博崔伟
Owner SHANDONG UNIV
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