TMCD Filtration via Rotary Pressure Drum Filter
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Solution Overview
Problem
The challenge lies in isolating 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCD) solids from a slurry with varying particle size distribution, which affects filtration rates and filter cloth fouling, requiring a solid-liquid separation technology that can efficiently produce a high-purity TMCD product while minimizing fouling and optimizing cake washing.
Innovation Solution
A process utilizing a rotary pressure drum filter for solid-liquid separation, where the TMCD slurry is treated to produce a wet cake with at least 65% TMCD content, with subsequent liquid phase removal and routing to a solvent recovery zone to generate a recycle mother liquor stream, and routing TMCD reaction by-product impurities to a purge zone, optimizing wash ratios and minimizing fouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional filtration methods are used to isolate TMCD solids from slurry, then solid-liquid separation can be achieved, but filtration rate decreases and filter cloth fouling increases due to variable particle size distribution
Solution Approach 1:
The patent applies parameter changes by controlling crystallization conditions (temperature, concentration, additives) to produce TMCD crystals with a narrower particle size distribution. This fundamental change in particle characteristics improves filtration rate and reduces filter cloth fouling by ensuring more uniform flow through the filter media and preventing clogging from excessive fine particles.
Solution Approach 2:
The patent implements preliminary action through a pre-filtration or classification step before the main filtration process. By pre-separating particles or adjusting the slurry characteristics beforehand, the system prepares the feed for more efficient filtration, reducing the likelihood of filter cloth fouling and maintaining higher filtration rates throughout operation.
2Manufacturing precision
If filtration is performed to isolate TMCD solids, then product purity can be achieved, but cake washing efficiency varies with particle size distribution
Solution Approach 1:
The patent uses parameter changes in the crystallization process to produce particles with optimized size and morphology characteristics. This enables more effective washing during filtration, as the controlled particle size distribution allows for better penetration of wash solutions through the cake structure, improving washing efficiency while maintaining high product purity.
3Quantity of substance
If slurry with wide particle size distribution is filtered, then all TMCD solids can be captured, but filtration becomes unpredictable and requires extensive process optimization
Solution Approach 1:
The patent implements preliminary action by controlling the crystallization process to produce particles with a narrower size distribution before filtration. This pre-optimization of particle characteristics simplifies the subsequent filtration process, making it more predictable and reducing the need for extensive process optimization while maintaining high TMCD solids recovery.
Solution Approach 2:
The patent applies parameter changes in the crystallization stage (temperature, concentration, residence time, additives) to fundamentally alter the particle size distribution of the slurry. This creates a more favorable feed for filtration, resulting in more predictable filtration behavior and reduced complexity in process optimization while maintaining high solids recovery.
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 process effectively isolates TMCD solids with high purity and reduces filter cloth fouling, achieving efficient solid-liquid separation and solvent recovery, thereby improving the overall TMCD production efficiency.
Implementation Method 1
a product isolation zone defined as a rotary pressure drum filter
Data Source
AI summary
A method for isolating 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCD) solids from an isolated feed slurry formed in a TMCD process comprising TMCD, a liquid phase, and impurities by (a) treating the isolated feed slurry in a product isolation zone to produce an isolated TMCD product wet cake, a mother liquor, and impurities; wherein the product isolation zone can comprise at least one rotary pressure drum filter.