Supercritical Water Depolymerization of Biomass and Waste Plastics
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Solution Overview
Problem
Current biomass and waste plastic conversion technologies face inefficiencies in breaking down complex polymers into usable fuels, with existing methods being neither commercially viable nor scalable for large-scale production.
Innovation Solution
The use of supercritical water combined with electromagnetic induction heating to depolymerize biomass and waste plastics into simple sugars, hydrocarbons, and aromatic compounds, which can be further converted into liquid transportation fuels, employing a centralized induction heating system and conductive particles for enhanced heat transfer and chemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional acid hydrolysis and enzymatic saccharification methods are used to convert cellulose to glucose, then the process can be carried out under mild conditions, but the conversion efficiency is low and the method is not commercially viable
Solution Approach 1:
The patent changes the physical and chemical parameters of water by heating it to supercritical conditions (temperature above 374°C and pressure above 218 atm), transforming it from a conventional solvent to a supercritical fluid with enhanced reactivity and solvent power, enabling rapid and efficient cellulose hydrolysis
Solution Approach 2:
The patent utilizes the phase transition of water from liquid to supercritical fluid state through heating and pressurization, allowing the water to access a unique physical state with properties that enable rapid cellulose breakdown while maintaining control over the reaction process
2Object-affected harmful factors
If microorganisms and enzymes are used to attack cellulose, then the process is biologically friendly, but they cannot effectively attack cellulose without prior treatment and the process remains inefficient
Solution Approach 1:
The patent applies preliminary action by first treating the cellulose with supercritical water to break down the complex polymer structure into simpler units, making the cellulose more accessible and susceptible to subsequent biological attack by microorganisms and enzymes, thereby enabling efficient conversion without requiring harsh preliminary treatments
3Productivity
If flow or batch type micro-reactors are used to hydrolyze cellulose in supercritical water, then high yield glucose can be obtained rapidly, but the system is not suitable for commercial-scale production
Solution Approach 1:
The patent applies segmentation by dividing the commercial-scale production system into multiple modular components including feedstock preparation units, supercritical water generation systems, reaction zones, separation sections, and product processing units, allowing each module to be optimized and scaled independently for commercial application
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 enables the rapid and efficient conversion of biomass and plastics into fuel-ready components, overcoming the limitations of existing technologies by achieving high yields and scalability, producing fuels compatible with diesel and gasoline markets.
Implementation Method 1
cellulose may be rapidly hydrolyzed in supercritical water to yield glucose
Implementation Method 2
water and plastic undergoes the water gas reaction and hydrogen is released to combine with the chain fragments from the plastics
Implementation Method 3
an electromagnetic induction heating system in an operative relationship with the reaction zone
Implementation Method 4
the induction coil, when energized, passes an alternating electrical current that simultaneously generates a transverse alternating magnetic field
Implementation Method 5
water and plastic undergoes the water gas reaction and hydrogen is released to combine with the chain fragments from the plastics
Data Source
AI summary
A supercritical fluid polymer depolymerization machine is disclosed herein, which machine is capable of converting a wide range of biomass and/or waste plastic materials into a plurality of reaction products (liquid and gaseous) including fermentable sugars, hydrocarbons, and various aromatic substances that, in turn, are readily convertible into liquid transportation fuel known as “neodiesel.” In one embodiment, a supercritical fluid reaction apparatus for transforming a selected polymeric material flowstream into a plurality of reaction products is disclosed and comprises, in fluidic series: an extruder; a supercritical fluid reaction zone fluidicly connected to the extruder, the supercritical fluid reaction zone being proximate to a circumferentially positioned heater, with the heater being configured to transfer heat to the selected polymeric material flowstream admixed together with water to supercritical conditions to thereby facilitate chemical reaction; and a reaction products separation chamber fluidicly connected to the supercritical fluid reaction zone.