Recycled Polyester Prepolymer Processing with Adsorption Bed
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Solution Overview
Problem
Current methods for processing recycled polyester materials in polyester manufacturing processes are inefficient, leading to high energy consumption, equipment costs, and reduced catalyst lifetime due to the need for high combustion temperatures and complex device setups, while also failing to effectively remove semi-volatile impurities, which can result in contamination and degradation of the recycled polyester.
Innovation Solution
A method involving the blending of recycled polyester material with a polyester prepolymer, followed by thermal treatment with a process gas containing organic impurities and controlled oxygen supply, where the process gas is passed through a protective adsorption bed to remove high-boiling substances before catalytic combustion, allowing for lower combustion temperatures and more efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high combustion temperatures are used to ensure complete combustion of organic impurities, then combustion efficiency is improved, but energy consumption increases and catalyst lifetime decreases
Solution Approach 1:
The patent applies preliminary action by removing high-boiling organic substances through adsorption in a protective bed before the combustion step. This pre-removal of refractory compounds prevents catalyst deactivation and allows combustion to proceed at lower temperatures, thereby reducing energy consumption while maintaining combustion efficiency.
Solution Approach 2:
The patent introduces a protective adsorption bed as an intermediary component between the process gas stream and the catalyst bed. This intermediary removes difficult-to-combust substances before they reach the catalyst, protecting the catalyst and enabling lower temperature operation, thus resolving the contradiction between combustion efficiency and energy consumption.
2Reliability
If high combustion temperatures are used to ensure complete combustion of organic impurities, then combustion efficiency is improved, but catalyst lifetime decreases
Solution Approach 1:
The protective adsorption bed performs preliminary removal of high-boiling organic substances that would otherwise cause catalyst deactivation. By eliminating these refractory compounds before combustion, the catalyst operates under milder conditions, extending its service life while maintaining combustion efficiency.
Solution Approach 2:
The adsorption bed serves as a protective intermediary that intercepts and removes catalyst-poisoning substances before they can deactivate the catalyst. This intermediary layer allows the catalyst to function at lower temperatures with extended lifetime while maintaining combustion performance.
3Measurement precision
If complex device setups with multiple components and pipelines are used to control oxygen supply and measure gas composition, then combustion control precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes high-boiling organic substances from the process gas stream using a protective adsorption bed, eliminating the need for complex measurement and control systems. By physically removing the problematic substances, the system achieves reliable operation without requiring sophisticated sensors and control algorithms.
Solution Approach 2:
The adsorption bed acts as a simplifying intermediary that handles the complex task of removing refractory organic substances through adsorption. This physical-chemical intermediary replaces the need for complex measurement and control systems, achieving reliable combustion control with simpler equipment.
4Reliability
If high combustion temperatures are used to combust organic impurities, then complete combustion is achieved, but heat losses increase requiring more insulation material
Solution Approach 1:
The protective adsorption bed performs preliminary removal of high-boiling organic substances before combustion. This pre-removal allows the combustion process to operate at lower temperatures, reducing the temperature gradient and minimizing heat losses to the environment, thereby reducing insulation requirements.
Solution Approach 2:
The adsorption bed serves as an intermediary that eliminates refractory organic substances, enabling lower temperature combustion. This reduces thermal losses to surroundings and decreases the amount of insulation material needed, resolving the contradiction between combustion completeness and heat losses.
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 enables reliable and continuous processing of recycled polyester materials, reduces energy consumption, and prevents catalyst deactivation, thereby improving the quality and longevity of the recycled polyester products.
Implementation Method 1
the process gas is passed through a protective bed arranged upstream of the heat exchanger for heating the process gas and containing a solid adsorption material which removes high-boiling organic substances or organic substances having a high combustion temperature from the process gas stream
Implementation Method 2
introducing the process gas containing organic impurities and optionally an amount of oxygen less than required to completely combust the organic impurities in said process into at least one heat exchanger to heat the process gas
Implementation Method 3
Combustion of the organic impurities in the process gas in the at least one catalyst bed
Implementation Method 4
a temperature in the range of 100 to 250° C. being set so that the high-boiling substances can condense and be taken up by the adsorption material
Data Source
AI summary
A method for processing a mixture of recycled polyester material and a polyester prepolymer from a polyester manufacturing process, wherein a recycled polyester material is mixed with a polyester prepolymer, from a polyester manufacturing process, and treated in a bulk thermal treatment reactor (7) with a process gas which flows in a counter-current or a cross-current flow direction to the flow direction of the mixture. In this process, the process gas, before entering a catalyst vessel (14), is passed through a protective bed (11) containing a solid adsorbent material that removes high-boiling organic substances or organic substances, with a high combustion temperature, from the process gas stream.