Pyrolysis Oil Dechlorination Using Char Accelerator
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Solution Overview
Problem
The existing methods for producing pyrolysis oil from waste plastics result in a high content of chlorine, leading to equipment corrosion, abnormal reactions, and deterioration of product properties during the hydrotreating process, and require excessive use of dechlorinating agents that remain in the oil, making it difficult to obtain high-quality pyrolysis oil.
Innovation Solution
A method and device that utilize char, a by-product of the waste plastic pyrolysis process, as an accelerator to reduce chlorine content in pyrolysis oil. The char is reused and combined with a dechlorinating agent to form an aggregate that is used in the pyrolysis process, effectively adsorbing chlorine and improving process efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If waste plastic pyrolysis is performed using conventional methods, then pyrolysis oil is produced, but the oil contains high chlorine content causing equipment corrosion and abnormal reactions
Solution Approach 1:
The patent introduces an accelerator as an intermediary substance that facilitates chlorine removal during pyrolysis. The accelerator, comprising basic earth metal compounds and organic compounds, mediates between the waste plastic and pyrolysis conditions to reduce chlorine content in the resulting oil, preventing corrosion and abnormal reactions while maintaining production efficiency.
Solution Approach 2:
The patent modifies the pyrolysis process parameters by adding specific chemical substances (accelerator) that change the chemical environment during pyrolysis. The accelerator alters the reaction parameters to favor chlorine removal, transforming the pyrolysis conditions to produce lower-chlorine oil without sacrificing production volume.
2Object-affected harmful factors
If dechlorinating agents are used in excessive amounts to reduce chlorine, then chlorine content decreases, but the agents remain in the oil making it difficult to obtain high-quality pyrolysis oil
Solution Approach 1:
The patent optimizes the accelerator composition parameters, specifically using basic earth metal compounds with controlled basicity and organic compounds with specific functional groups. This parameter optimization enables effective chlorine removal while the accelerator components can be easily separated or decomposed, preventing contamination of the pyrolysis oil and maintaining high product quality.
Solution Approach 2:
The accelerator composition creates a porous or reactive structure during pyrolysis that facilitates chlorine capture. The organic compounds in the accelerator form porous structures or reactive sites that trap chlorine, allowing it to be removed from the oil phase while the accelerator itself can be separated, ensuring high oil quality without residual contamination.
3Manufacturing precision
If adsorbents are used to remove chlorine, nitrogen and other impurities, then impurity content decreases, but the adsorbents deteriorate and require continuous replacement
Solution Approach 1:
The accelerator is designed to be self-regenerating or easily renewable. The basic earth metal compounds and organic compounds work synergistically to capture impurities, and the system allows for simple regeneration or replacement of the accelerator without complex equipment. The accelerator maintains its effectiveness over multiple cycles or can be easily replenished, eliminating the need for continuous adsorbent replacement and reducing process complexity.
4Object-affected harmful factors
If hydrotreating is performed to convert chlorine to hydrogen chloride for removal, then chlorine is reduced, but excessive hydrogen chloride causes equipment corrosion and abnormal reactions
Solution Approach 1:
The patent converts the harmful chlorine in waste plastic into a beneficial or manageable form through the accelerator-mediated pyrolysis. Instead of generating excessive hydrogen chloride that causes corrosion, the accelerator captures chlorine in a controlled manner, transforming it into a form that can be easily removed or neutralized, thereby converting the harmful chlorine into a manageable by-product while protecting equipment.
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 achieves a significant reduction in chlorine content in the pyrolysis oil, allowing it to be directly introduced into a refinery process without additional post-treatment, while also improving cost-effectiveness and process efficiency by reusing char and reducing energy consumption.
Implementation Method 1
a method for producing waste plastic pyrolysis oil with reduced chlorine includes a first operation of charging a waste plastic raw material and an accelerator containing char into a reactor; a second operation of pyrolyzing the waste plastic raw material in the reactor and recovering pyrolysis oil
Data Source
AI summary
Embodiments of the present disclosure provide a method for producing waste plastic pyrolysis oil with reduced chlorine, the method including a first operation of charging a waste plastic raw material and an accelerator containing char into a reactor; a second operation of pyrolyzing the waste plastic raw material in the reactor and recovering pyrolysis oil; and a third operation of recovering the accelerator from the reactor.