Para-Xylene Adsorption with Reduced Bed Count
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The productivity of para-xylene production units using simulated counter-current separation processes is limited due to increased pressure drops and mechanical stress on adsorbent grains, leading to inefficiencies and high costs when trying to increase production, with existing solutions requiring substantial investments or reducing adsorbent quantity, which affects purity and yield.
Innovation Solution
Reducing the number of beds in each adsorber from the conventional 12 to 10 or fewer, while maintaining two adsorbers in series, allows for the production of high purity para-xylene with a reduced volume of solid adsorbent, distributing pressure and minimizing void spaces to maintain plug flow and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of beds in each adsorber is increased to increase productivity, then the production capacity is improved, but the pressure drops and mechanical stress on adsorbent grains increase
Solution Approach 1:
The system divides the adsorption process into two separate adsorbers operating in series, each with a reduced number of beds (10 or fewer), rather than using a single adsorber with many beds. This segmentation reduces the pressure drop across each individual adsorber while maintaining overall productivity through coordinated operation of both units.
2Productivity
If the number of beds in each adsorber is increased to increase productivity, then the production capacity is improved, but the mechanical stress on adsorbent grains increases
Solution Approach 1:
By splitting the system into two adsorbers with fewer beds each, the mechanical stress on adsorbent grains in any single bed is reduced compared to a conventional single adsorber with many beds, while the series configuration maintains overall production capacity.
3Ease of manufacture
If the quantity of solid adsorbent is reduced to minimize investment, then the cost is decreased, but the purity and yield of para-xylene are affected
Solution Approach 1:
The system uses two adsorbers in series, each with reduced bed count (10 or fewer), which reduces the total volume of solid adsorbent needed compared to conventional single adsorbers, while the series configuration and coordinated switching maintain high para-xylene purity and yield.
4Volume of stationary object
If the number of beds is reduced to minimize adsorbent volume, then the adsorbent volume is decreased, but void spaces increase affecting plug flow
Solution Approach 1:
By using two adsorbers in series with reduced beds each, the system minimizes total adsorbent volume while the series configuration helps maintain stable plug flow patterns through coordinated operation and reduced void spaces in each individual adsorber.
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 the production of high purity para-xylene (>99.7%) with increased productivity and reduced adsorbent volume, minimizing investment and operational challenges, while maintaining the same flow rate of para-xylene production, as demonstrated in the examples.
Implementation Method 1
a para-xylene separation process functioning in simulated counter-current mode comprises at least four zones... zone 1: para-xylene desorption zone... zone 2: isomers of para-xylene desorption zone... zone 3: para-xylene adsorption zone... zone 4: zone located between the withdrawal of the raffinate R and the injection of the desorbant D
Data Source
AI summary
The present invention describes a novel configuration for simulated counter-current para-xylene production units, constituted by two adsorbers, characterized in that the volume occupied by the solid adsorbent is reduced by at least 8% compared with the volume of solid adsorbent contained in the adsorbers of a prior art unit. This novel configuration can be used to minimize the quantity of solid adsorbent necessary to produce a given quantity of para-xylene.