Mild pyrolysis method for preparing liquid hydrocarbon through waste polyolefin

A technology for waste polyolefins and liquid hydrocarbons, applied in the field of mild cracking, can solve the problems of low liquid yield, increased catalytic cracking section, and high gas yield, avoiding unfavorable secondary reactions, reducing melt viscosity, and low cracking temperature. Effect

Inactive Publication Date: 2015-11-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The above-mentioned patents all involve the technology of waste plastic cracking to produce liquid hydrocarbons and co-cracking or returning to re-cracking technology. Generally speaking, the current technology has the following shortcomings: 1) The gas yield is too high and the liquid yield is low, which is not conducive to the liquefaction and recycling of waste plastics; 2) The high viscosity of waste plastics in molten state and the low thermal conductivity of waste plastics are not conducive to the continuous operation of pyrolysis. Co-pyrolysis of waste plastics and other materials is one of t

Method used

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  • Mild pyrolysis method for preparing liquid hydrocarbon through waste polyolefin
  • Mild pyrolysis method for preparing liquid hydrocarbon through waste polyolefin
  • Mild pyrolysis method for preparing liquid hydrocarbon through waste polyolefin

Examples

Experimental program
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Example Embodiment

[0035] Example 1 Gentle cracking of polyolefins (HDPE, HDPE / PP)

[0036] Such as figure 1 As shown, a gentle cracking method for preparing liquid hydrocarbons from waste polyolefins, the method includes the following steps:

[0037] 1) Pre-treatment: After separating and removing components that easily release harmful gases from the waste polyolefin plastic, the waste polyolefin plastic is crushed and granulated to obtain polyolefin particles with a particle size of 2 to 4 mm as the cracking raw material;

[0038] 2) Wax making: After adding the waste polyolefin particles prepared in step 1) to the wax making device, the wax making device is sealed and the air is purged with inert gas to ensure that the cracking reaction proceeds in an inert atmosphere. Set the reaction temperature range When the temperature is 300~380℃, turn on the stirring and start heating, the stirring rate is 200~400rpm, the heating rate is 2~20℃ / min, and the set reaction temperature is reached. After the reacti...

Example Embodiment

[0066] Example 2 Gentle cracking of waste polyolefin (HDPE / PP=50 / 50)

[0067] Such as figure 2 As shown, a gentle cracking method for preparing liquid hydrocarbons from waste polyolefins, the method includes the following steps:

[0068] 1) Use mixed waste polyolefin particles (50 / 50 waste HDPE / PP, black, provided by Longda Plastic Products Factory, Xiong County, Hebei Province) with a particle size of 2 to 5 mm as raw materials for cracking;

[0069] 2) Wax making: After adding the waste polyolefin particles of step 1) into the wax making device, the wax making device is sealed and the air is purged with inert gas to ensure that the cracking reaction proceeds in an inert atmosphere. The reaction temperature range is set to 300 ~380°C, start stirring and start heating, stirring rate 200~400rpm, heating rate 2~20°C / min, reaching the set reaction temperature, after the reaction is completed, stop heating and cooling to obtain waste polyolefin wax;

[0070] 3) Waste polyolefin particles...

Example Embodiment

[0079] Example 3

[0080] 1) Use waste polyolefin (HDPE / PP=50 / 50) with a particle size of 0.1~200mm as raw material for cracking;

[0081] 2) The above-mentioned waste polyolefin is heated up at a heating rate of 4°C / min, and the temperature reaches 380°C and immediately cooled down to obtain a white solid waste polyolefin wax;

[0082] 3) Heat up waste polyolefin, waste polyolefin / waste polyolefin wax = 2:1, waste polyolefin wax at a heating rate of 4°C / min to 430°C, and maintain it at this temperature for 30min or 40min, and collect The yields of gaseous products and gaseous products at this temperature are shown in Table 8.

[0083] Table 8 The yield list of waste HDPE / PP mild pyrolysis products

[0084]

[0085] It can be seen from Table 8 that when HDPE and wax are mixed and cracked (the mass ratio is 2:1), the yield of the gaseous product obtained is about 3% higher than the theoretical yield, indicating that the waste polyolefin is made into wax. It has a good function of promo...

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Abstract

The invention discloses a mild pyrolysis method for preparing liquid hydrocarbon through waste polyolefin. The method includes the following steps of firstly, conducting pretreatment; secondly, manufacturing wax; thirdly, conducting mixing and copyrolysis; fourthly, terminating mixing and copyrolysis; fifthly, conducting product collection. According to the method, the low heating rate is adopted, cleavage reaction happens to materials in the temperature rise process, the constant-temperature process and the cooing process, the yield of the liquid hydrocarbon is increased, secondary polymerization or dehydrogenation reaction are little during reaction, and the obtained liquid hydrocarbon is mainly composed of alkane and is extremely low in arene content.

Description

technical field [0001] The invention belongs to the technical field of recycling waste plastics, in particular, the invention relates to a mild cracking method for preparing liquid hydrocarbons from waste polyolefins. Background technique [0002] Plastic is a polymer material 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, a large amount of waste plastics has caused increasingly serious "white pollution". [0003] Landfill, incineration, and recycling are the main methods of waste plastics treatment at present. With the increasing amount of waste plastics and the increasingly stringent environmental management, landfill and incineration have begun to be restricted or even resisted. The chemical recovery of small molecular hydrocarbons (solid wax, liquid oi...

Claims

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Application Information

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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
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