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Device and method for directly heating and cracking waste polyolefin by hydrogen-oxygen combustion method

A technology of waste polyolefin and combustion method, which is applied in the preparation of liquid hydrocarbon mixtures and the petroleum industry, etc. It can solve the problems of poor process control and increased costs, and achieve the effect of avoiding heat transfer process and uneven mixing

Inactive Publication Date: 2017-10-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology requires a multi-stage hydrogen catalytic combustion device and an adiabatic reaction device to be connected in series to increase the yield of olefins, and the combustion needs the help of a catalyst, which will inevitably increase the cost, and the process is not easy to control

Method used

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  • Device and method for directly heating and cracking waste polyolefin by hydrogen-oxygen combustion method
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  • Device and method for directly heating and cracking waste polyolefin by hydrogen-oxygen combustion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] Example 1 The high temperature cracking of waste polyolefin mild cracking liquid product

[0100] The waste polyolefin used in this example is a high-density polyethylene / polypropylene mixture, and the cracking raw material is a fraction with a boiling point -1 , Constant temperature residence time 40 ~ 90min. The liquid product obtained by mild cracking is distilled to obtain fractions with a boiling point <380°C. The cracking method and device used in this example are as described above.

[0101] In this example, under the conditions shown in Table 1, the pyrolysis raw materials are subjected to pyrolysis. The cracking results of this embodiment are shown in Table 2.

[0102] It can be seen from Table 2 that the polyolefin cracking liquid has good cracking performance, and the obtained ethylene and propylene have a relatively high molar content. With the increase of cracking temperature, the production rate of ethylene and propylene increases.

[0103] The pyrolys...

Embodiment 2

[0107] Example 2 High temperature cracking of waste polyolefin mild cracking waxy product and light diesel oil mixture

[0108] The waste polyolefin used in this example is a high-density polyethylene / polypropylene mixture, and the cracking raw material is a mixture of viscous soft solid paraffin and light diesel oil obtained by mild cracking of high-density polyethylene in a certain proportion. A 1L closed reactor is used for mild cracking, the cracking temperature is set at 400°C, and the heating rate is 3-5°C·min -1 , constant temperature residence time. The light oil used in this embodiment is the same as in Example 2, and the high-temperature cracking system used is the same as in Example 1.

[0109] In this embodiment, under the conditions shown in Table 3, the pyrolysis raw materials are subjected to pyrolysis. The cracking results of this embodiment are shown in Table 4.

[0110] Table 4 shows that the mixture of waxy products and petroleum hydrocarbons has good cra...

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Abstract

The invention relates to the field of cracking of waste polyolefin, and concretely relates to an apparatus and a method thereof for directly heating and cracking waste polyolefin by an oxy-hydrogen combustion method. The apparatus comprises an oxy-hydrogen combustor (1-3) and a pyrolysis reaction apparatus (1-1), the oxy-hydrogen combustor (1-3) is communicated to the pyrolysis reaction apparatus (1-1), the pyrolysis reaction apparatus (1-1) comprises a pyrolysis reactor (2-1), the pyrolysis reactor (2-1) comprises a mixer (2-1a) and a reactor (2-1b) which are connected up and down; an overheated steam inlet (3-1) and a gas-liquid mixing material inlet (3-3) are respectively arranged on two opposite sidewalls of the mixer (2-1a) along the tangential direction, and a gaseous state material inlet (3-2) is arranged at top of the mixer (2-1a) along the axial direction. The apparatus uses a tangential or axial mixing mode of overheated steam and the material to effectively avoid over cracking or incomplete cracking due to uneven mixing.

Description

technical field [0001] The invention relates to the field of cracking waste polyolefins, in particular, the invention relates to a device and method for directly heating and cracking waste polyolefins by a hydrogen-oxygen combustion method. Background technique [0002] Polyolefins are bulk plastic products with a wide range of uses. Statistics show that in 2011, China's plastic consumption has reached nearly 60 million tons, accounting for more than a quarter of the world's total consumption, and China has become the world's largest plastic consumer. At the same time, due to the generally short service life of plastic products, especially plastic packaging, a large amount of waste plastics has caused increasingly serious "white pollution". In waste plastics, polyolefins represented by polyethylene and polypropylene usually account for 60-70%, and the treatment of waste polyolefins has therefore become a major aspect of waste plastics treatment. [0003] Landfill, incinera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/00
Inventor 温浩景晓东赵月红许志宏
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI