Waste Plastic Pyrolysis Using Hot-Filter Neutralization
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Solution Overview
Problem
Existing pyrolysis methods for waste plastics produce oil with high impurity levels, particularly chlorine, leading to equipment corrosion and air pollutant emissions, and require post-treatment processes to reduce impurities, complicating the production process.
Innovation Solution
A pyrolysis method involving a pyrolysis process at 400 to 550°C in a non-oxidizing atmosphere followed by a lightening process at 400 to 550°C and normal pressure in an oxygen-free atmosphere using a hot filter filled with a neutralizing agent, such as calcium oxide, to produce pyrolysis oil with less than 100 ppm chlorine and high naphtha and kero content without additional post-treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional pyrolysis methods are used to produce waste plastic pyrolysis oil, then oil production is achieved, but the oil contains high levels of impurities (especially chlorine) causing equipment corrosion and air pollutant emissions
Solution Approach 1:
The patent applies preliminary action by performing a lightening process immediately after pyrolysis while the oil is still hot (at pyrolysis temperature), before the oil cools and solidifies. This preliminary treatment prevents impurity formation and equipment corrosion that would occur with conventional post-treatment methods
Solution Approach 2:
The patent uses a neutralizing agent as an intermediary substance introduced into the pyrolysis reactor along with the waste plastic. This neutralizing agent reacts with chlorine and other impurities during pyrolysis, converting them into harmless substances and preventing their release into the environment or corrosion of equipment
2Object-generated harmful factors
If post-treatment processes (HDT, Cl treating) are introduced to remove impurities, then chlorine content is reduced, but equipment corrosion and process complexity increase
Solution Approach 1:
The patent merges the pyrolysis process with the impurity removal process by introducing a neutralizing agent directly into the pyrolysis reactor. This combination eliminates the need for separate post-treatment units (HDT process, Cl treating process), simplifying the overall system while effectively reducing chlorine content to below detection limits
Solution Approach 2:
The patent converts the harmful chlorine content into a benefit by using the chlorine released during pyrolysis to react with the neutralizing agent, forming harmless salts. The harmful impurities become part of a controlled chemical reaction that protects equipment and prevents environmental pollution
3Object-generated harmful factors
If conventional refinery processes are used to treat high-chlorine waste oil, then chlorine removal is achieved, but the process requires pretreatment and cannot directly accept non-pretreated waste oil
Solution Approach 1:
The patent performs preliminary chlorine removal action during the pyrolysis process itself by introducing a neutralizing agent, rather than requiring pretreatment before conventional refinery processes. This preliminary action makes the pyrolysis oil suitable for direct use or further refining without additional pretreatment steps
Solution Approach 2:
The patent enables the pyrolysis system to self-service by internally handling impurity removal through the neutralizing agent. The system becomes self-sufficient, producing high-quality oil that can be directly used or refined without requiring external pretreatment facilities, thereby improving adaptability and versatility
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 method effectively reduces impurities in waste plastic pyrolysis oil to a significantly high level, producing pyrolysis oil suitable for refinery processes with improved yield and reduced emissions, without the need for post-treatment.
Implementation Method 1
a pyrolysis process of producing pyrolysis gas by introducing waste plastics into a pyrolysis reactor
Implementation Method 2
a lightening process of producing pyrolysis oil by introducing the pyrolysis gas into a hot filter filled with a neutralizing agent
Data Source
AI summary
The present invention provides a method for producing waste plastic pyrolysis oil, the method comprising: a pyrolysis process of producing pyrolysis gas by introducing waste plastic into a pyrolysis reactor; and a hardening process of producing pyrolysis oil by injecting the pyrolysis gas into a hot filter filled with a neutralizer, wherein the pyrolysis oil contains, on the basis of the total weight, 50% by weight or more of naphtha having a boiling point of 150°C or less and kero having a boiling point of 150°C to 265°C and less than 100 ppm of chlorine.