Large Pore Rotary Pressure Filter for Aromatic Acid Separation
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Solution Overview
Problem
Current rotary pressure filter apparatuses for solid/liquid separation in the chemical, food, and pharmaceutical industries face inefficiencies in filtration performance and fouling, particularly when dealing with solid aromatic carboxylic acid particles, due to the mismatch between filter pore size and particle size, leading to reduced flow rates and increased resistance.
Innovation Solution
The process involves filtering a solid/liquid mixture using a rotary pressure filter with a filter surface having an average pore size greater than the median particle size of the solid aromatic carboxylic acid particles, and removing the wet filter cake without substantial drying to prevent solvent deposition and fouling, thereby enhancing filtration efficiency and resistance to fouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a small pore size filter is used to achieve high separation precision, then manufacturing precision of the solid product is improved, but flow rate decreases and fouling increases
Solution Approach 1:
The patent changes the pore size parameter of the filter from conventional small pore sizes to large pore sizes (average pore size greater than the median particle size of the solid particles). This parameter change resolves the contradiction by maintaining solid product purity through the rotary pressure filter's multiple work zones (filtration, washing, drying) while significantly improving flow rate and reducing fouling due to the larger pore size preventing clogging.
2Manufacturing precision
If a small pore size filter is used to prevent particle passage, then manufacturing precision is improved, but device reliability deteriorates due to increased fouling
Solution Approach 1:
The filter pore size parameter is changed from small to large (average pore size greater than median particle size). This resolves the contradiction by preventing fouling through the larger pore size while maintaining product purity through the integrated washing and drying zones in the rotary pressure filter apparatus.
Solution Approach 2:
The filtration process is segmented into multiple work zones within the rotary pressure filter: a filtration zone for initial separation, a washing zone for removing impurities, and a drying zone for moisture removal. This segmentation allows the use of large pore size filters without compromising product purity, as each zone performs a specific function that collectively achieves high purity output while maintaining filter reliability.
3Manufacturing precision
If multiple-stage separation techniques are used to improve solid product purity, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
Multiple separation functions (filtration, washing, drying) that would traditionally require separate equipment are merged into a single rotary pressure filter apparatus. The filter progresses material through separate work zones, combining multiple stages of separation into one integrated device, thereby reducing equipment complexity while maintaining high product purity.
Solution Approach 2:
The rotary pressure filter apparatus performs multiple functions simultaneously: it filters the solid/liquid mixture, washes the filter cake to remove impurities, and dries the washed filter cake. This multi-functionality eliminates the need for separate filtration, washing, and drying equipment, reducing overall device complexity while achieving high manufacturing precision.
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 improves filtration performance by increasing flow rates and reducing fouling, allowing for more efficient recovery of solid aromatic carboxylic acid with higher purity and reduced equipment investment, as the larger pore size filter effectively handles the particle distribution and prevents solvent deposition.
Implementation Method 1
filtering the solid/liquid mixture to form a filter cake on a filter surface
Data Source
AI summary
Solid/liquid separation processes using a large pore filter. One aspect of the disclosure is a process comprising filtering a solid/liquid mixture of a collection of solid aromatic carboxylic acid particles in a solvent in a first zone of a rotary pressure filter apparatus to form a filter cake on a filter surface, and removing the filter cake from the filter surface.