Rotary Pressure Filter Capacity Optimization
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Solution Overview
Problem
Rotary pressure filter apparatuses have finite throughput capacities and often require additional drying equipment due to insufficient drying capabilities, leading to increased capital expenditures and operational inefficiencies in multi-stage separation processes.
Innovation Solution
The process involves filtering a solid/liquid mixture in a rotary pressure filter apparatus to form a filter cake, washing it with a wash fluid to create a wet filter cake containing at least 10 wt % wash fluid, and then transferring it to a dryer, while optimizing the apparatus configuration by limiting the dry zone size and expanding the feed zone to achieve higher capacities, with a capacity ratio of at least 3000 kg/(hr-m2) and a dryer with a heating load of at least 50 kcal/kg wet cake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the drying capability of the rotary pressure filter apparatus is increased to eliminate downstream drying equipment, then capital expenditures are reduced, but the apparatus complexity and device size increase
Solution Approach 1:
The patent combines the filtration and drying functions into a single rotary pressure filter apparatus by integrating a drying zone within the apparatus. The filter cake is dried in situ during rotation, eliminating the need for separate downstream drying equipment and reducing capital expenditures while maintaining manageable apparatus complexity through functional integration.
Solution Approach 2:
The rotary pressure filter apparatus is designed to perform multiple functions: filtration in the filter zone, washing in the wash zone, and drying in the drying zone. This multi-functionality allows a single apparatus to replace what would traditionally require separate equipment for each operation, reducing overall system complexity and capital investment.
2Productivity
If multiple rotary pressure filter apparatus are used in parallel to increase capacity, then throughput capacity increases, but capital expenditures increase
Solution Approach 1:
The patent merges multiple separation functions (filtration, washing, drying) into a single rotary pressure filter apparatus with enhanced capacity. By increasing the size and capability of one apparatus rather than using multiple smaller units in parallel, the design achieves high throughput while reducing capital expenditures on additional equipment.
Solution Approach 2:
The patent transitions from increasing capacity through parallel units (horizontal scaling) to increasing capacity through a single apparatus with expanded functional zones (vertical scaling). The drying zone is integrated within the existing rotary structure, utilizing the vertical and radial dimensions of the apparatus to accommodate additional drying capacity without requiring multiple units.
3Manufacturing precision
If the filter cake is dried more thoroughly in the rotary pressure filter apparatus, then downstream drying requirements are reduced, but the feed zone capacity is decreased
Solution Approach 1:
The patent applies partial drying action in the drying zone, removing sufficient moisture to meet product specifications without over-drying. This partial action approach maintains an optimal balance between feed zone capacity and drying effectiveness, allowing the apparatus to process larger volumes while achieving the required product purity and reducing downstream drying requirements.
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 enhances the separation process capacity, reduces capital expenditures, and requires a larger dryer load, allowing for more efficient processing and higher purity products, such as aromatic carboxylic acids, by maintaining a higher wetness level in the filter cake and increasing the throughput without the need for multiple apparatuses.
Implementation Method 1
filtering a solid/liquid mixture to form a filter cake comprising the solid product on at least one filter member in a rotary pressure filter apparatus configured to apply a pressure differential across the at least one filter member
Implementation Method 2
drying the wet filter cake in the dryer
Implementation Method 3
a dryer with a heating load of at least 50 kcal/kg wet cake
Data Source
AI summary
A process for the separation of the components of a solid/liquid mixture. The process Includes the use of a rotary pressure filter apparatus having improved capacity.