[Fe-Cu-Mo-P]/Al2O3 Catalyst for Polymer Depolymerization
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Solution Overview
Problem
The high cost of producing waxes and grease base stocks due to the expensive petroleum feedstocks and inefficiencies in existing conversion processes, which also lead to greenhouse gas emissions and sensitivity to plastic waste quality and quantity, necessitate a more economical and efficient method for utilizing polymeric waste.
Innovation Solution
A catalytic depolymerization process using a [Fe—Cu—Mo—P]/Al2O3 catalyst, prepared by binding a ferrous-copper complex to an alumina support and reacting it with a heteropolyacid, is employed to convert molten polymeric materials into waxes and grease base stocks in a high-pressure reactor at temperatures between 300° C. to 600° C., allowing for the production of desirable products with controlled pressure and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If petroleum feedstocks are used to produce waxes and grease base stocks, then product quality is maintained, but production cost increases
Solution Approach 1:
The patent changes the chemical parameters of the feedstock from petroleum-based to polymer-based materials, while adjusting process parameters (temperature, pressure, catalyst composition) to achieve comparable product quality at lower cost. The catalyst system [Fe-Cu-Mo-P]/Al2O3 is specifically designed to facilitate polymer depolymerization into wax and grease base stock range hydrocarbons.
Solution Approach 2:
The patent utilizes inexpensive polymer waste materials as feedstock instead of expensive petroleum feedstocks. The process converts low-value polymer waste into high-value wax and grease base stocks, effectively transforming disposable waste into valuable products while reducing production costs.
2Productivity
If existing conversion processes are used to convert polymeric waste, then some product is obtained, but energy consumption increases and greenhouse gas emissions occur
Solution Approach 1:
The patent replaces high-energy thermal cracking processes with a catalytic depolymerization process using [Fe-Cu-Mo-P]/Al2O3 catalyst. This substitution of mechanical/thermal energy input with catalytic action reduces energy consumption and avoids greenhouse gas emissions while maintaining high product yields.
Solution Approach 2:
The patent optimizes process parameters including temperature (300-600°C), pressure (50-350 psig), and catalyst composition to achieve efficient depolymerization with minimal energy input. The controlled pressure and temperature parameters enable selective bond cleavage with reduced energy requirements compared to conventional methods.
3Productivity
If existing conversion processes are used, then product is produced, but sensitivity to plastic waste quality and quantity increases
Solution Approach 1:
The patent develops a universal catalyst system [Fe-Cu-Mo-P]/Al2O3 that can process multiple types of polymer waste (PE, PP, PS, PVC, PET) with varying qualities and quantities. The catalyst demonstrates multi-functionality across different polymer feedstocks, making the process adaptable to mixed plastic waste streams without requiring feedstock pre-sorting or quality control.
4Productivity
If high pressure and temperature are applied in the reactor, then depolymerization efficiency increases, but energy consumption increases
Solution Approach 1:
The patent optimizes the pressure-temperature parameter space to achieve efficient depolymerization at moderate conditions (300-600°C, 50-350 psig). The [Fe-Cu-Mo-P]/Al2O3 catalyst enables the reaction to proceed efficiently at these optimized parameters, reducing the energy input required compared to uncatalyzed or poorly optimized processes.
Solution Approach 2:
The patent replaces high-energy thermal input with catalytic action. The catalyst provides an alternative reaction pathway with lower activation energy, enabling depolymerization to proceed at lower temperatures and pressures than would be required for thermal cracking, thus reducing energy consumption while maintaining high productivity.
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 process achieves selective production of waxes and grease base stocks with yields greater than 90%, reduces energy consumption, and allows for the utilization of polymeric waste, addressing the cost and environmental issues of existing methods while being insensitive to impurities and varying plastic grades.
Implementation Method 1
The catalyst material includes [Fe—Cu—Mo—P]/Al2O3 prepared by binding a ferrous-copper complex to an alumina support to generate an intermediate material, and reacting the intermediate material with a heteropolyacid
Implementation Method 2
binding a ferrous-copper complex to an alumina support to generate an intermediate material
Data Source
AI summary
A process for converting a molten polymeric material is provided. The process includes effecting disposition of a molten polymeric material, having at least one carbon-carbon double bond, in sufficient proximity to a catalyst material within a reaction zone, to affect a reactive process that effects generation of a reaction product. The reactive process effects cleaving of at least one carbon-carbon double bond. The catalyst material includes [Fe—Cu—Mo—P]/Al2O3 prepared by binding a ferrous-copper complex to an alumina support to generate an intermediate material and reacting the intermediate material with a heteropolyacid.