Rotary Vacuum Filter Non-Polymeric Cloth for Bisphenol A Crystals
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Solution Overview
Problem
Rotary vacuum filters used in bisphenol A production experience frequent shutdowns due to worn, damaged, or detached polymeric filter cloths, leading to reduced productivity and increased maintenance time.
Innovation Solution
The implementation of a rotary vacuum filter with a non-polymeric filter cloth and a scraper section made from materials like polyether ether ketone and polytetrafluoroethylene, along with improved fastening methods using thermoplastic elastomeric inserts and metallic pieces, enhances the mean time between failures and reduces repair times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric filter cloths are used in rotary vacuum filters, then the initial filtration performance is adequate, but the filter cloths wear, damage, or detach frequently leading to shutdowns and reduced productivity
Solution Approach 1:
The patent replaces durable but problematic polymeric filter cloths with inexpensive metal mesh filter cloths that can be easily replaced. The metal mesh filters have significantly longer service life and maintain structural integrity under vacuum conditions, eliminating frequent shutdowns for replacement while reducing overall maintenance costs.
Solution Approach 2:
The patent employs a composite fastening system combining thermoplastic elastomeric inserts with metallic fastening pieces. The elastomeric inserts provide flexible retention to hold the filter cloth securely, while the metallic pieces provide structural strength. This composite approach prevents filter cloth detachment and extends operational reliability.
2Reliability
If frequent filter cloth replacement is performed, then filter performance is maintained, but maintenance time increases and productivity decreases
Solution Approach 1:
The metal mesh filter cloths are designed to be inexpensive and long-lasting, replacing the need for frequent maintenance. Their superior durability means they maintain filtration performance over extended periods without requiring replacement, significantly reducing maintenance time and increasing productive operation time.
Solution Approach 2:
The filter cloths are pre-attached to the filter drum using the improved fastening system during setup. This preliminary secure attachment prevents mid-operation failures and detachment, ensuring consistent performance throughout the operational cycle without requiring intermittent maintenance interventions.
3Ease of manufacture
If conventional fastening methods are used for filter cloths, then assembly is simple, but filter cloths detach or wear leading to failures
Solution Approach 1:
The fastening system combines thermoplastic elastomeric inserts with metallic fastening pieces. The elastomeric material provides flexible retention to hold the filter cloth securely, while the metallic components provide structural strength. This composite approach maintains ease of assembly while dramatically improving attachment stability and preventing detachment during operation.
Solution Approach 2:
The patent changes the material parameters of the fastening system by introducing thermoplastic elastomeric inserts with specific durometer values (40-70 Shore A) and melting points (80-120°C). These parameter changes optimize both the retention force and ease of assembly, allowing simple installation while ensuring reliable attachment under operational conditions.
4Ease of operation
If polymeric filter cloths and scrapers are used, then initial operation is smooth, but product loss and resource consumption increase due to frequent failures
Solution Approach 1:
The metal mesh filter cloths and PTFE scrapers are designed for long service life and consistent performance. By eliminating frequent failures and shutdowns, they prevent product loss associated with interrupted operations and ensure continuous smooth operation without increasing substance loss.
Solution Approach 2:
The combination of metal mesh filters and PTFE scrapers creates a composite filtration system where each material performs optimally. The PTFE scraper's low friction coefficient (0.04-0.10) prevents product adhesion and facilitates smooth operation, while the metal mesh filter provides durable separation, collectively reducing product loss and maintaining operational smoothness.
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 configuration increases the mean time between failures of the rotary vacuum filter, decreases product loss, lowers phenol and nitrogen usage, and reduces steam consumption by improving the durability and attachment of filter cloths and scrapers, thereby enhancing overall production efficiency.
Implementation Method 1
a vacuum source in fluid communication with said interior surface of said perforated sector
Implementation Method 2
separating the bisphenol A-phenol adduct crystals from the crystallization liquor to form a filter cake on said filter cloth and a crystallization liquor stream in said interior surface of said perforated sector
Data Source
Figure 1~2
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Figure 5~6
AI summary
A rotary vacuum filter for separation of bisphenol A-phenol adduct crystals from a crystallization liquor is provided. The rotary vacuum filter includes a filter drum with a perforated sector on a lateral surface of the filter drum; a non-polymeric filter cloth attached to the filter drum and covering said perforated sector; and a vacuum pump in fluid communication with an interior surface of the perforated sector. Methods and uses of thereof are also provided.