Stable Waste Plastic–Petroleum Blends for Low-Chloride Refinery Feed
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Solution Overview
Problem
Current methods for recycling polyethylene and polypropylene waste plastics into value-added chemicals and fuels are inefficient, producing low-quality products and are not scalable due to high chloride content, which causes corrosion and poor product quality in refinery processes.
Innovation Solution
A stable blend of waste plastic and petroleum-based feedstock is prepared with minimal chloride content (less than 100 ppm) by heating, mixing, filtering, and optionally treating with a chloride removal guard bed catalyst, resulting in a homogeneous liquid blend that can be safely fed to refinery units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If waste plastic is directly fed to refinery units, then conversion to fuel products can occur, but chloride content causes corrosion and poor product quality
Solution Approach 1:
The patent applies preliminary action by performing chloride removal from waste plastic feedstock before it enters the refinery conversion process. The process includes heating waste plastic to 400-800°F to volatilize chloride, followed by filtration through a guard bed to remove particulate matter containing chloride. This pre-treatment ensures that the feedstock entering the refinery unit has sufficiently low chloride content to prevent corrosion and maintain product quality, while still enabling efficient conversion to fuel products.
2Adaptability or versatility
If pyrolysis is used to convert waste plastic to fuel, then chemical recycling can occur, but the products have poor quality and cannot be blended in large amounts
Solution Approach 1:
The patent merges two approaches: it combines the chemical recycling capability of pyrolysis with the quality control benefits of controlled thermal treatment and filtration. The process heats waste plastic to 400-800°F (below typical pyrolysis temperatures) to volatilize chloride without extensive decomposition, then filters the feedstock before refinery conversion. This combination enables both high recycling adaptability and production of fuel-quality products suitable for large-scale blending.
Solution Approach 2:
The patent applies parameter changes by controlling the heating temperature range (400-800°F) to be lower than conventional pyrolysis temperatures. This temperature control prevents excessive decomposition that would degrade product quality, while still being sufficient to volatilize chloride. The controlled thermal treatment followed by filtration transforms the feedstock quality parameters, enabling production of high-quality fuel products from waste plastic.
3Reliability
If chloride removal treatment is applied to waste plastic, then corrosion and product quality issues are reduced, but processing complexity increases
Solution Approach 1:
The patent extracts chloride from waste plastic feedstock through a focused pre-treatment sequence: heating to volatilize chloride, then filtration through a guard bed to remove chloride-containing particulates. This extraction approach removes the harmful chloride component while maintaining the bulk plastic material for conversion. The process adds only one or two processing steps before the main refinery conversion, making the complexity increase manageable while significantly improving reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process enables efficient conversion of waste plastics to high-value products like gasoline, jet fuel, and diesel fuel with good yields, reducing energy consumption and environmental impact while maintaining refinery equipment integrity.
Implementation Method 1
heating to a temperature sufficient to volatilize chloride
Implementation Method 2
filtering to remove particulate matter
Data Source
AI summary
Provided is a blend of a petroleum feedstock and 1-20 wt. % of plastic, based on the weight of the blend, with the plastic comprising polyethylene and/or polypropylene, and the plastic in the blend comprising finely dispersed microcrystalline particles having an average particle size of 10 micron to less than 100 microns and less than 100 ppm chloride. A process for preparing a blend of plastic and petroleum is provided, comprising mixing together a petroleum feed and a plastic comprising polyethylene and/or polypropylene and heating the mixture in the range of from 550° F. to 700° F. The blend mixture is then hot filtered and then optionally treated with a chloride removal guard bed. The resulting blend can then be cooled and stored or sent directly to a refinery conversion unit.