Waste Plastic Pyrolysis Oil Dehydration for Hydrotreating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for producing refined hydrocarbons from waste plastic pyrolysis oil face challenges such as the formation of ammonium salt (NH4Cl), catalyst deactivation, and adhesion of impurity particles in reactors, leading to reduced process efficiency and durability issues.
Innovation Solution
A method involving dehydration of a mixed solution of waste plastic pyrolysis oil, washing water, and a demulsifier with applied voltage, followed by hydrotreating with a sulfur source and a molybdenum-based catalyst, and alkylation with olefins to minimize impurities and maintain catalyst activity, thereby reducing 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, then impurities such as chlorine, nitrogen, and oxygen are removed, but ammonium salt (NH4Cl) is formed causing corrosion and process complications
Solution Approach 1:
The patent applies preliminary dehydration treatment to the pyrolysis oil before hydrotreating. Water is removed by heating the pyrolysis oil to 50-200°C under reduced pressure (10-100 mmHg) to reduce water content to below 0.5 wt%. This preliminary action prevents ammonium salt formation during subsequent hydrotreating by eliminating the water necessary for NH4Cl formation from HCl and NH3.
Solution Approach 2:
The patent converts the harmful effect of water in pyrolysis oil into a beneficial dehydration process. By utilizing the water already present in the pyrolysis oil and applying reduced pressure heating, the system efficiently removes water without requiring additional chemicals or complex equipment. The water that would cause harm is transformed into a removable component that can be easily separated.
2Manufacturing precision
If waste plastic pyrolysis oil is hydrotreated to remove impurities, then refined oil quality improves, but catalyst activity decreases over time due to adhesion of impurity particles
Solution Approach 1:
The patent applies preliminary dehydration treatment to the pyrolysis oil before hydrotreating. Water is removed by heating the pyrolysis oil to 50-200°C under reduced pressure (10-100 mmHg) to reduce water content to below 0.5 wt%. This preliminary action prevents ammonium salt formation during subsequent hydrotreating by eliminating the water necessary for NH4Cl formation from HCl and NH3.
Solution Approach 2:
The patent converts the harmful effect of water in pyrolysis oil into a beneficial dehydration process. By utilizing the water already present in the pyrolysis oil and applying reduced pressure heating, the system efficiently removes water without requiring additional chemicals or complex equipment. The water that would cause harm is transformed into a removable component that can be easily separated.
3Manufacturing precision
If conventional hydrotreating is performed on waste plastic pyrolysis oil, then impurities are removed, but reactor durability is reduced due to corrosion from HCl and ammonium salt formation
Solution Approach 1:
The patent applies preliminary dehydration treatment to the pyrolysis oil before hydrotreating. Water is removed by heating the pyrolysis oil to 50-200°C under reduced pressure (10-100 mmHg) to reduce water content to below 0.5 wt%. This preliminary action prevents ammonium salt formation during subsequent hydrotreating by eliminating the water necessary for NH4Cl formation from HCl and NH3.
Solution Approach 2:
The patent converts the harmful effect of water in pyrolysis oil into a beneficial dehydration process. By utilizing the water already present in the pyrolysis oil and applying reduced pressure heating, the system efficiently removes water without requiring additional chemicals or complex equipment. The water that would cause harm is transformed into a removable component that can be easily separated.
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 produces high-quality refined hydrocarbons with low impurity content and high octane number, maintaining catalyst activity for long-term operation and preventing impurity particle adhesion, thus enhancing refining efficiency and process stability.
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 hydrotreating catalyst
Data Source
AI summary
Embodiments of the present disclosure relate to a method and system for producing refined hydrocarbons from waste plastic pyrolysis oil. The method 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 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 method and system for producing refined hydrocarbons according to the embodiments of the present disclosure may have excellent refining efficiency and may implement a long-term operation of a process because deactivation of a catalyst used in the process is prevented and may produce refined hydrocarbons having a low content of impurities and a high octane number from waste plastic pyrolysis oil.