Liquefied Waste Plastic Feed for Ethylene Production
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Solution Overview
Problem
Existing methods for upgrading liquefied waste plastic (LWP) face challenges such as high impurity levels, coking tendencies, and the need for hydrogenation, which consumes significant energy and resources.
Innovation Solution
A method involving thermal cracking of a liquefied waste plastic feed with a controlled i-olefins to n-olefins ratio of 3.0 or less, allowing for high yields of ethylene without the need for extensive hydrogenation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional hydrogenation is applied to remove olefins from LWP, then coking tendency is reduced, but hydrogen consumption increases significantly
Solution Approach 1:
The invention changes the compositional parameters of the LWP feed by controlling the i-olefins to n-olefins ratio to be 3.0 or less. This parameter change allows the feed to be directly suitable for steam cracking without requiring hydrogenation treatment, thereby reducing coking tendency while avoiding significant hydrogen consumption.
2Quantity of substance
If extensive hydrogenation is performed to purify LWP, then impurity levels decrease, but energy consumption and production costs increase
Solution Approach 1:
The invention changes the compositional parameters of the LWP feed by controlling the i-olefins to n-olefins ratio to be 3.0 or less. This parameter change allows the feed to be directly suitable for steam cracking without requiring hydrogenation treatment, thereby reducing impurity levels while avoiding significant energy consumption.
3Device complexity
If LWP with high i-olefins content is used for steam cracking, then process simplicity is maintained, but coking tendency increases and run lengths decrease
Solution Approach 1:
The invention changes the compositional parameters of the LWP feed by controlling the i-olefins to n-olefins ratio to be 3.0 or less. This parameter change reduces coking tendency and extends run lengths while maintaining process simplicity, as no additional hydrogenation units are required.
4Adaptability or versatility
If conventional steam cracking is applied to LWP without composition control, then production flexibility is maintained, but ethylene yield varies significantly
Solution Approach 1:
The invention changes the compositional parameters of the LWP feed by controlling the i-olefins to n-olefins ratio to be 3.0 or less. This parameter change ensures high and stable ethylene yields while maintaining production flexibility, as the controlled composition allows direct feeding to steam crackers without additional processing steps.
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 method achieves high yields of valuable products like ethylene while reducing coking tendencies and minimizing hydrogen consumption, thereby enhancing the sustainability and efficiency of the upgrading process.
Implementation Method 1
a step of thermally cracking the liquefied waste plastic feed in a thermal cracking reactor
Data Source
AI summary
The disclosure relates to a method for upgrading liquefied waste plastic, wherein the method includes a step of providing a liquefied waste plastic feed, a step of thermally cracking the liquefied waste plastic feed in a thermal cracking reactor, and a step of separating at least a fraction including ethylene from the effluent of the thermal cracking reactor, wherein the liquefied waste plastic feed has a content ratio of i-olefins to n-olefins of 3.0 or less. The disclosure also provides a liquefied waste plastic feed for thermal cracking.