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Preparation method of low-chloride plastic pyrolysis oil

A technology for cracking oil and plastics, applied in the field of preparation of low-chlorine plastic cracking oil, can solve the problems of high reactor cost, difficult implementation, low dechlorination efficiency, etc., and achieve the effect of simple equipment and small impact

Inactive Publication Date: 2018-09-11
HIGH TECH RES INST NANJING UNIV LIANYUNGANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, these existing dechlorination technologies are faced with the problems of high reactor cost, difficulty in implementation, or low dechlorination efficiency

Method used

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  • Preparation method of low-chloride plastic pyrolysis oil
  • Preparation method of low-chloride plastic pyrolysis oil
  • Preparation method of low-chloride plastic pyrolysis oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Mix and crush 0.5kg of cleaned PVC plastic, 2.3kg of PP plastic, 2.3kg of PS plastic, and 4.9kg of PE plastic to less than 5mm 3 Add 0.5kg heat-loaded 80-mesh quartz sand into 50L dechlorination cracking reactor 1, and start the first reaction temperature section to heat up under stirring, with a heating rate of 3-8°C·min -1 , kept at the final temperature of 250°C for 2-3 hours, mixed plastics at this temperature section for melting and dehydration; the released water was cooled to the first storage tank 2 by the first condenser 3, and the non-condensable gas was washed by the scrubber 8, and then Enter the gas storage tank 9 for storage. The final temperature insulation of the first reaction temperature section is over, and the second reaction temperature section is started to heat up, and at the same time, 0.5L·s is added to the dechlorination cracking reactor 1. -1 Nitrogen gas is passed at a rate, and the heating rate is 3-8°C·min -1 , keep at the final temperatu...

Embodiment 2

[0030] Mix and crush 1.0kg of cleaned PVC plastic, 2.15kg of PP plastic, 2.15kg of PS plastic and 4.7kg of PE plastic to less than 5mm 3 Add 0.5kg heat-loaded 80-mesh quartz sand into 50L dechlorination cracking reactor 1, and start the first reaction temperature section to heat up under stirring, with a heating rate of 3-8°C·min -1 , kept at the final temperature of 250°C for 2-3 hours, mixed plastics at this temperature section for melting and dehydration; the released water was cooled to the first storage tank 2 by the first condenser 3, and the non-condensable gas was washed by the scrubber 8, and then Enter the gas storage tank 9 for storage. The final temperature insulation of the first reaction temperature section is over, and the second reaction temperature section is started to heat up, and at the same time, the dechlorination cracking reactor 1 is filled with 1.5L·s -1 Nitrogen gas is passed at a rate, and the heating rate is 3-8°C·min -1, keep at the final tempera...

Embodiment 3

[0032] Mix and crush 2kg of cleaned PVC plastic, 1.9kg of PP plastic, 1.9kg of PS plastic, and 4.2kg of PE plastic to less than 5mm 3 Add 1.5kg of hot-loaded 100-mesh quartz sand into the 50L dechlorination cracking reactor 1. Under stirring, start the first reaction temperature section to raise the temperature, and the heating rate is 3-8°C·min -1 , kept at the final temperature of 250°C for 2-3 hours, mixed plastics at this temperature section for melting and dehydration; the released water was cooled to the first storage tank 2 by the first condenser 3, and the non-condensable gas was washed by the scrubber 8, and then Enter the gas storage tank 9 for storage. The final temperature insulation of the first reaction temperature section is over, and the second reaction temperature section starts to heat up, and at the same time, 2.5L·s is added to the dechlorination cracking reactor 1. -1 Nitrogen gas is passed at a rate, and the heating rate is 3-8°C·min -1 , keep at the fi...

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Abstract

The invention discloses a preparation method of low-chloride plastic pyrolysis oil. The preparation method of the low-chloride plastic pyrolysis oil comprises the steps of sectionally heating mixed plastic containing vinyl chloride step by step; after thoroughly removing released hydrogen chloride by utilizing nitrogen purging or vacuum pumping within the temperature range of decomposing and releasing hydrogen chloride through the vinyl chloride, adding a composite catalyst for carrying out deep dechlorination and catalytic pyrolysis on waste materials, and obtaining the low-chloride-content plastic pyrolysis oil. According to the preparation method of the low-chloride plastic pyrolysis oil provided by the invention, the dechlorination and pyrolysis reactions of the mixed plastic are accomplished through the same reactor, so that equipment is simple; through a sectioning method, the mixed plastic is fully decomposed, so that different decomposition products are favorably obtained; through nitrogen / vacuum assistance, HCl can be quickly and thoroughly air-stripped, the influence on follow-up plastic pyrolysis reaction is less, and the low-chloride-content plastic pyrolysis oil can beobtained.

Description

technical field [0001] The invention relates to a preparation method of low-chlorine plastic cracking oil, which belongs to the technical field of resource recycling and environmental protection. Background technique [0002] In 2016, my country's production of plastic products reached 771 million tons, accounting for 27.8% of the world's output. For example, there are a lot of waste plastics in municipal solid waste, medical waste and some industrial waste. Plastic is the product of petrochemical deep processing. These thermoplastic waste plastics can undergo pyrolysis after being isolated from oxygen and heated to a certain temperature, forming Oil, gas and coke, these products can be recycled. However, due to the high chlorine content of PVC (about 58 wt% chlorine), its pyrolysis produces a large amount of HCl, which causes equipment corrosion and catalyst deactivation in subsequent processes. Therefore, to obtain high-quality pyrolysis oil by pyrolyzing plastics, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/00
CPCC10G1/00C10G1/08C10G2300/1003
Inventor 魏跃周华兰宋金文王旭龙
Owner HIGH TECH RES INST NANJING UNIV LIANYUNGANG
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