Multi-bed RCPSA Process for Oxygen Separation
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Solution Overview
Problem
PSA processes face a trade-off between process productivity and product recovery, with improvements in one often leading to decreases in the other, particularly when using adsorbents with fast or slow adsorption kinetics.
Innovation Solution
A multi-bed rapid cycle pressure swing adsorption (RCPSA) process using at least five adsorption beds with 'fast' kinetically selective adsorbents and incorporating specific pressure equalization and depressurization steps, allowing for higher specific productivity while maintaining product recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adsorbents with fast adsorption kinetics are used, then process productivity is improved, but product recovery decreases
Solution Approach 1:
The system is divided into multiple adsorption beds (at least five) that operate in different phases of the PSA cycle simultaneously. This segmentation allows fast-kinetics adsorbents to be used while maintaining high product recovery through coordinated operation of multiple beds, where some beds are in adsorption mode and others in desorption or equalization mode.
Solution Approach 2:
The invention employs periodic pressure swing cycles with multiple distinct phases (adsorption, equalization, depressurization, purging, repressurization) that repeat cyclically across different beds. This periodic action allows the system to maintain high productivity through rapid cycling while ensuring complete product recovery through the coordinated progression of each bed through all cycle phases.
2Loss of substance
If the number of adsorbent beds is increased to improve product recovery, then specific productivity decreases
Solution Approach 1:
The system dynamically coordinates the operation of multiple beds through a sophisticated valve switching system that optimizes the phase of each bed at any given time. This dynamic control allows the minimum necessary number of beds (at least five) to be used efficiently, maintaining high specific productivity while achieving complete product recovery through optimal timing and sequencing of pressure equalization and gas flow between beds.
3Productivity
If cycle time is reduced to increase production, then working capacity per cycle decreases and pressure drop increases
Solution Approach 1:
The invention changes the pressure parameters dynamically during the cycle, employing rapid pressure swings between high and low states. The use of at least five beds allows for optimized pressure equalization steps that maintain adequate working capacity per cycle even as cycle time is reduced, because the larger number of beds provides more flexibility in distributing the adsorption and desorption loads across different pressure states.
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
The RCPSA process achieves high process productivity and product recovery by optimizing the number of adsorbent beds and pressure equalization steps, specifically using 'fast' adsorbents and tailored pressure cycles to enhance both productivity and recovery.
Implementation Method 1
PSA processes have long been used for the separation of the components of air
Implementation Method 2
kinetically selective laminate adsorbent structures
Implementation Method 3
kinetic separation of gases
Data Source
AI summary
Disclosed herein are multi-bed rapid cycle pressure swing adsorption (RCPSA) processes for separating O2 from N2 and/or Ar, wherein the process utilizes at least five adsorption beds each comprising a kinetically selective adsorbent for O2 having an O2 adsorption rate (1/s) of at least 0.20 as determined by linear driving force model at 1 atma and 86° F.