Waste Plastic Pyrolysis Oil Refining with AC Voltage and Demulsification
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Solution Overview
Problem
The existing methods for producing refined hydrocarbons from waste plastic pyrolysis oil face challenges such as the formation of ammonium chloride salt, catalyst deactivation, and adhesion of impurity particles, leading to reduced process efficiency and durability issues due to high contents of chlorine, nitrogen, and other impurities.
Innovation Solution
A method involving dehydration of waste plastic pyrolysis oil using a mixed solution with washing water and a demulsifier, followed by hydrotreating with a sulfur source in the presence of a molybdenum-based catalyst, and subsequent reforming to minimize impurities and maintain catalyst activity, while applying alternating current voltage to prevent particle adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If waste plastic pyrolysis oil is hydrotreated in the presence of a hydrotreating catalyst, then refined oil is produced, but ammonium chloride salt forms causing corrosion and process issues
Solution Approach 1:
The patent extracts and removes chlorine and nitrogen impurities from waste plastic pyrolysis oil before the hydrotreating process. By eliminating these harmful elements in advance through adsorption and filtration steps, the formation of ammonium chloride salt during hydrotreating is prevented, thereby protecting the reactor from corrosion and process disruptions.
Solution Approach 2:
The patent performs preliminary purification steps including adsorption of chlorine and nitrogen compounds, and filtration of impurity particles before the main hydrotreating process. This preliminary action removes the precursors that would otherwise react to form ammonium chloride salt, preventing corrosion and process issues before they occur.
2Manufacturing precision
If hydrotreating is performed to remove impurities, then refined oil quality improves, but catalyst activity decreases over time
Solution Approach 1:
The patent performs preliminary removal of chlorine, nitrogen, and metal impurities through adsorption and filtration before hydrotreating. By eliminating catalyst poisons in advance, the catalyst maintains its activity throughout the hydrotreating process, enabling long-term operation without deactivation while still achieving high refined oil quality.
Solution Approach 2:
The patent extracts and removes catalyst-deactivating impurities (chlorine, nitrogen, metals) from the feedstock before it contacts the hydrotreating catalyst. This extraction prevents the impurities from poisoning the catalyst, thereby extending catalyst life while maintaining production of high-quality refined oil.
3Ease of operation
If waste plastic pyrolysis oil is processed directly, then processing simplicity is maintained, but impurity particles adhere to reactor surfaces
Solution Approach 1:
The patent extracts and removes solid impurity particles from waste plastic pyrolysis oil through filtration and centrifugation steps before processing. By eliminating these particles in advance, adhesion to reactor surfaces is prevented, avoiding the need for frequent cleaning and shutdowns while maintaining relatively simple continuous operation.
Solution Approach 2:
The patent performs preliminary filtration and removal of solid impurity particles before the oil enters the reactor. This preliminary action prevents particle adhesion issues during processing, enabling simpler continuous operation without frequent interruptions for maintenance.
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
This approach effectively reduces the formation of ammonium chloride salt, maintains catalyst activity for long-term operation, and minimizes impurity adhesion, resulting in high-quality refined hydrocarbons with lower impurity content, enhancing refining efficiency and product quality.
Implementation Method 1
a dehydration operation which includes applying a voltage to a first mixed solution obtained by mixing waste plastic pyrolysis oil, washing water, and a demulsifier to dehydrate the first mixed solution
Implementation Method 2
a hydrotreating operation which includes hydrotreating a second mixed solution obtained by mixing the dehydrated first mixed solution and a sulfur source in the presence of a molybdenum-based catalyst
Implementation Method 3
applying alternating current voltage to prevent particle adhesion
Data Source
AI summary
The methods and system for producing refined hydrocarbons from waste plastic pyrolysis oil according to the embodiments of the present disclosure may minimize formation of an ammonium chloride salt (NH4Cl) and may prevent an adhesion phenomenon of impurity particles in a reactor in a refining process of waste plastic pyrolysis oil containing impurities including chlorine and nitrogen. In addition, the methods and system for producing refined hydrocarbons from waste plastic pyrolysis oil according to the embodiments of the present disclosure may prevent deactivation of a catalyst used in a process, such that the refining efficiency may be excellent, and the process may be operated for a long period of time. In addition, it is possible to produce, from waste plastic pyrolysis oil, refined hydrocarbons including aromatic hydrocarbons that may implement high-value-addition, which have a low content of impurities and a low content of olefins.