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A kind of method for preparing aromatic hydrocarbon by catalytic pyrolysis of waste polyolefin plastic

A technology of catalytic pyrolysis and waste polyolefin, which is applied in the preparation of liquid hydrocarbon mixtures and the petroleum industry to achieve the effects of short reaction cycle, mild reaction conditions and convenient recycling

Inactive Publication Date: 2019-01-22
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to select a low-cost, simple-to-prepare catalytic material to replace the more expensive molecular sieve catalyst, and use catalytic rapid pyrolysis chemical process to generate aromatic compounds with high added value

Method used

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  • A kind of method for preparing aromatic hydrocarbon by catalytic pyrolysis of waste polyolefin plastic
  • A kind of method for preparing aromatic hydrocarbon by catalytic pyrolysis of waste polyolefin plastic
  • A kind of method for preparing aromatic hydrocarbon by catalytic pyrolysis of waste polyolefin plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Catalytic fast pyrolysis of polypropylene and polyethylene

[0025] Experimental raw materials: polypropylene, polyethylene

[0026] Reaction device: catalytic pyrolysis instrument (CDS5200HP-R analytical pyrolyzer)

[0027] Pyrolysis temperature: 650°C

[0028] Pyrolysis time: 30s

[0029] Reaction pressure: normal pressure

[0030] Heating rate: 20℃ / ms

[0031] Catalyst: niobic acid (purity>99%)

[0032] Product analysis: Agilent6890 / 5973i GC / MS.

[0033] Note: The reaction carrier gas is helium; the yield is calculated based on the molar carbon yield of the product.

[0034] Table 1 Yields of CFP reaction products of different raw materials

[0035]

[0036] Note: a Including ortho, meta and para xylenes;

[0037] b Includes isomers of ethylbenzene, methylethylbenzene and mesitylene;

[0038] c Including naphthalene, alkyl naphthalene.

[0039] The present embodiment obtains the yield of each product as figure 1 shown.

Embodiment 2

[0040] Example 2 Effect of pyrolysis temperature and pyrolysis time on catalytic fast pyrolysis

[0041] Experimental raw material: polyethylene

[0042] Reaction device: catalytic pyrolysis instrument (CDS5200HP-R analytical pyrolyzer)

[0043] Pyrolysis temperature: 600°C, 650°C, 700°C

[0044] Pyrolysis time: 30s, 60s

[0045] Reaction pressure: normal pressure

[0046] Heating rate: 20℃ / ms

[0047] Catalyst: niobic acid (purity>99%)

[0048] Product analysis: Agilent6890 / 5973i GC / MS.

[0049] Note: The reaction carrier gas is helium; the yield is calculated based on the molar carbon yield of the product.

[0050] In order to study the suitable pyrolysis temperature and time of polyolefin plastic raw materials, polyethylene was used as the reaction raw material and niobic acid was used as the catalyst to evaluate the catalytic reaction, see figure 2 . From figure 2 It can be seen that the yield of aromatics is the lowest when the pyrolysis temperature and time ar...

Embodiment 3

[0051] Example 3 Effect of Phosphoric Acid Modified Niobic Acid on Catalytic Rapid Pyrolysis of Polyolefin Plastics

[0052] Experimental raw material: polypropylene

[0053] Reaction device: catalytic pyrolysis instrument (CDS5200HP-R analytical pyrolyzer)

[0054] Pyrolysis temperature: 600℃

[0055] Pyrolysis time: 60s

[0056] Reaction pressure: normal pressure

[0057] Heating rate: 20℃ / ms

[0058] Catalyst: niobic acid, impregnated with equal volumes of 0.5M / L, 1M / L, 1.5M / L and 2M / L phosphoric acid respectively

[0059] Product analysis: Agilent6890 / 5973i GC / MS.

[0060] Note: The reaction carrier gas is helium; the yield is calculated based on the molar carbon yield of the product.

[0061] In order to increase the yield of aromatics in the catalytic pyrolysis reaction of polyolefin plastics, niobic acid was impregnated with phosphoric acid of different molar concentrations, and its catalytic activity was studied, see image 3 . Depend on image 3 It can be seen ...

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Abstract

The invention belongs to the field of resource-converting utilization of waste plastics and particularly relates to a method for preparing aromatic hydrocarbons through catalytically pyrolyzing waste polyolefin plastics. According to the method, liquid aromatic hydrocarbons are synthesized through catalytic rapid pyrolysis in a manner of taking the polyolefin plastics as a raw material, taking niobic acid as a catalyst, taking nitrogen gas as carrier gas and taking a catalytic pyrolyzer as a reactor. Preferably, polypropylene serves as the raw material, 1M / L phosphoric acid equal-volume-impregnated niobic acid serves as the catalyst, and thus, the yield of the aromatic hydrocarbon product is increased. In the product of catalytic pyrolysis of the polyolefin plastics by the niobic acid, the yield of the liquid aromatic hydrocarbons is high, subsequent separation and extraction are facilitated, and the catalyst can be reused repeatedly. The production process is simple in process and facilitates continuous production.

Description

technical field [0001] The invention belongs to the field of resource utilization of waste plastics, and in particular relates to a method for preparing aromatics by catalytic pyrolysis of waste polyolefin plastics. Background technique [0002] Plastics have been widely produced and applied around the world due to their high quality and low price. In 2013, the world's plastic output reached 299 million tons, of which China accounted for the largest proportion, accounting for 24.8%, that is, the annual output of plastic products in my country reached 74.15 million tons. With the aging of plastics and the random discarding of single-use plastics, discarded plastics have become a major municipal solid waste (MSW). The annual output of urban solid waste in my country is 250 million tons, of which plastic waste accounts for about 8% to 9% (mass fraction), and polyolefin plastics (mainly PE and PP) account for a considerable proportion (more than 70%) )[Tang Saizhen. Current situ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/10
CPCC10G1/10
Inventor 孙剑平班福忱王鑫徐启程李希亢涵魏婕
Owner SHENYANG JIANZHU UNIVERSITY
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