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Recycling economy for conversion of plastic waste to polyethylene by refinery FCC unit or FCC/alkylation unit

A technology for waste plastic conversion and polyethylene, which is used in plastic recycling, preparation of liquid hydrocarbon mixtures, educts, etc. It can solve problems such as inability to mix transportation fuels, poor product quality, and unsustainability.

Pending Publication Date: 2022-08-05
CHEVROU USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this simple blending is not sustainable if large amounts of waste polyethylene and polypropylene are to be recycled to address environmental concerns
Products produced from pyrolysis units are of too poor quality to be blended into transportation fuels in large quantities (eg 5-20 vol.% blending)

Method used

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  • Recycling economy for conversion of plastic waste to polyethylene by refinery FCC unit or FCC/alkylation unit
  • Recycling economy for conversion of plastic waste to polyethylene by refinery FCC unit or FCC/alkylation unit
  • Recycling economy for conversion of plastic waste to polyethylene by refinery FCC unit or FCC/alkylation unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1: Properties of Commercially Sourced Pyrolysis Oils and Waxes

[0062] Pyrolysis oil and wax samples were obtained from commercial sources and their properties are summarized in Table 1. These pyrolysis samples were prepared from waste plastics mainly containing polyethylene and polypropylene by thermal decomposition in a pyrolysis reactor at approximately 400-600°C, near atmospheric pressure, without the addition of any gas or catalyst. The pyrolysis unit generally produces gas, liquid oil product, optional wax product and char. The pyrolysis unit overhead gas stream containing thermally cracked hydrocarbons is cooled to collect the condensate as pyrolysis oil (liquid at ambient temperature) and / or pyrolysis wax (solid at ambient temperature). Pyrolysis oil is the main product of the pyrolysis unit. Some units produce pyrolysis wax as a separate product in addition to pyrolysis oil.

[0063] Table 1

[0064] Properties of oils and waxes obtained from pyrol...

Embodiment 2

[0071] Example 2: Fractionation of pyrolysis oil evaluated as a transportation fuel

[0072] Sample D was distilled to produce representative gasoline (350°F - ), aviation fuel (350–572°F), diesel (572–700°F), and heavy (700°F) + ) fraction of the hydrocarbon fraction. Table 2 summarizes the boiling point distribution and impurity distribution in the distillation product fractions.

[0073] Table 2

[0074] Distillation of pyrolysis oil into fuel fractions

[0075]

[0076]

Embodiment 3

[0077] Example 3: Evaluation of pyrolysis oil fractions for gasoline fuels

[0078] Sample F, a gasoline fuel boiling range pyrolysis oil, was evaluated for potential use as a gasoline fuel. Sample F has a carbon number range of C5–C12 and is a typical gasoline fuel.

[0079] Oxidative stability (ASTM D525) and green tendency (ASTM D381) were identified as the most critical properties to examine due to the olefinic nature of the pyrolysis oil. Research Octane Number (RON) and Motor Octane Number (MON) are also key properties of engine performance. RON and MON values ​​were estimated from detailed hydrocarbon GC analysis.

[0080] table 3

[0081] Evaluation of pyrolysis oil naphtha fractions for gasoline fuels

[0082]

[0083] Sample F is a gasoline fuel boiling range pyrolysis oil fraction which cannot be used as a motor gasoline fuel by itself due to its poor quality. This gasoline fraction from pyrolysis oil showed very poor oxidation stability, with Sample F faili...

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PUM

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Abstract

In one embodiment there is provided a continuous process for converting waste plastic to reclaimed material for use in the polymerization of polyethylene. The process includes selecting waste plastic containing polyethylene and / or polypropylene, passing the waste plastic through a pyrolysis reactor to thermally crack at least a portion of the polyolefin waste and produce a pyrolysis effluent. The pyrolysis effluent is separated into an off-gas, a pyrolysis oil comprising naphtha / diesel and a heavy fraction, and optionally wax, and a scorch. The pyrolysis oil is sent to an oil refinery FCC unit, and a liquefied petroleum gas C3 olefin / paraffin mixed fraction and a C4 olefin / paraffin mixed fraction are recovered from the oil refinery FCC unit. In one embodiment, the pyrolysis oil is first sent to an FCC feed preprocessor. And conveying the liquefied petroleum gas C3 olefin / paraffin mixed fraction to a steam cracking device for producing ethylene. The C4 olefin / paraffin mixed fraction is passed to a refinery alkylation unit from which n-butane and naphtha are recovered for feed to a steam cracking unit to produce ethylene.

Description

Background technique [0001] World plastic production is growing extremely rapidly. According to PlasticsEurope Market Research Group, world plastic production was 335 million tons in 2016, 348 million tons in 2017 and 359 million tons in 2018. According to McKinsey & Company, the global volume of plastic waste was estimated to be around 260 million tons per year in 2016, and if the current trajectory continues, it is expected to reach 460 million tons per year by 2030. [0002] Single-use plastic waste has become an increasingly important environmental issue. Currently, there appear to be very few options for recycling polyethylene and polypropylene waste plastics into value-added chemicals and fuel products. Currently, only small amounts of polyethylene and polypropylene are recovered by chemical recovery processes, where recovered and cleaned polymer particles are pyrolyzed in a pyrolysis unit to make fuel (naphtha, diesel), stream cracker feed or soft wax. [0003] Meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/07C10B57/06C10G1/02
CPCC10B53/07C10G51/04C10G1/10C10G1/002C10G2400/20C10G2300/1003C08F10/02C10G2300/1081C10G2300/1044Y02P20/582C08F210/16C08F110/06Y02P20/143Y02W30/62
Inventor H-K·提姆肯C·麦克寇德
Owner CHEVROU USA INC