Waste Plastic Pyrolysis Oil Refining with Electrostatic Dehydration
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Solution Overview
Problem
Existing methods for refining waste plastic pyrolysis oil face challenges such as the formation of ammonium salt (NH4Cl), reactor corrosion, and impurity particle adhesion due to the presence of chlorine and nitrogen impurities, leading to reduced process efficiency and durability.
Innovation Solution
A method involving dehydration of waste plastic pyrolysis oil using a voltage application with washing water and a demulsifier, followed by hydrotreating with a sulfur source and a molybdenum-based catalyst to remove impurities, including chlorine, nitrogen, and other contaminants, while preventing ammonium salt formation and impurity adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If waste plastic pyrolysis oil is hydrotreated with hydrogen in the presence of a hydrotreating catalyst to remove impurities, then the content of impurities such as chlorine and nitrogen is reduced, but ammonium salt (NH4Cl) is formed causing reactor corrosion and process problems
Solution Approach 1:
The patent applies preliminary dehydration treatment to remove water from waste plastic pyrolysis oil before hydrotreating. By removing water in advance, the formation of ammonium salt during subsequent hydrotreating is prevented, as water is a necessary component for ammonium salt formation. This preliminary action resolves the contradiction by eliminating the harmful effect before it occurs while maintaining impurity removal efficiency.
Solution Approach 2:
The patent introduces a substance that reacts with and neutralizes ammonia before it can form ammonium salt with HCl during hydrotreating. This preliminary anti-action directly counteracts the harmful effect by preventing the formation reaction, allowing effective impurity removal without the adverse consequences of ammonium salt formation.
2Manufacturing precision
If conventional hydrotreating is performed to remove chlorine and nitrogen impurities, then impurity content is reduced, but reactor durability is reduced due to corrosion from ammonium salt formation
Solution Approach 1:
The patent performs preliminary dehydration to remove water before hydrotreating. Since ammonium salt formation requires water, preventing water presence in advance protects the reactor from corrosion while maintaining the ability to remove chlorine and nitrogen impurities effectively through subsequent hydrotreating.
Solution Approach 2:
The patent converts the harmful effect of water (which enables ammonium salt formation) into a benefit by removing it beforehand. The dehydration step transforms water from a necessary component of the harmful ammonium salt formation into a removed substance, thereby protecting reactor durability while preserving impurity removal capability.
3Manufacturing precision
If hydrotreating is performed to remove impurities, then refined oil quality is improved, but process efficiency is reduced due to ammonium salt formation causing differential pressure
Solution Approach 1:
The patent performs preliminary dehydration to remove water before hydrotreating. By eliminating water in advance, ammonium salt formation during hydrotreating is prevented, avoiding the differential pressure problems that reduce process efficiency. This allows the hydrotreating to proceed smoothly with maintained productivity while achieving high refined oil quality.
4Manufacturing precision
If waste plastic pyrolysis oil is refined by conventional methods, then impurities are removed, but impurity particles adhere to reactor walls causing process problems during long-term operation
Solution Approach 1:
The patent performs preliminary dehydration to remove water and prevent ammonium salt formation before hydrotreating. By eliminating the conditions for ammonium salt formation in advance, the patent prevents impurity particle adhesion to reactor walls, enabling continuous long-term operation without the process interruptions caused by particle buildup.
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 high-quality refined oil with significantly reduced impurities, suitable for blending with petroleum products, by maintaining catalyst activity and ensuring long-term process stability.
Implementation Method 1
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
hydrotreating a second mixed solution obtained by mixing the dehydrated first mixed solution dehydrated of step S1) and a sulfur source
Implementation Method 3
reacting waste plastic pyrolysis oil with hydrogen in the presence of a hydrotreating catalyst
Data Source
AI summary
A method for refining waste plastic pyrolysis oil is provided, including: 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 to form a dehydrated first mixed solution; and hydrotreating a second mixed solution obtained by mixing the dehydrated first mixed solution dehydrated and a sulfur source to produce refined oil from which impurities have been removed, and a device related thereto. The method and device may prevent or minimize formation of an ammonium salt (NH4Cl) and/or prevent adhesion of impurity particles in a refining process of waste plastic pyrolysis oil containing impurities such as chlorine and nitrogen, and provides waste plastic pyrolysis oil having low content of impurities and olefins and excellent quality, and thus, may be used as a feedstock for blending with existing petroleum products or oil refining and petrochemical processes.