Extractor Solvent Drainage Zone Design
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Solution Overview
Problem
Existing solvent extraction processes face inefficiencies in maximizing extract recovery while minimizing solvent loss, particularly when increasing feedstock flow rate leads to decreased extract recovery due to insufficient residence time and poor intermixing between the solvent and feedstock.
Innovation Solution
The design of an extractor with multiple bed decks that extend from below to above the solvent level, incorporating a drainage section to allow solvent to drain back into the pool, enhancing the efficiency of solvent recovery and reducing solvent loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feedstock flow rate through the extractor is increased to improve productivity, then productivity increases, but extract recovery decreases due to insufficient residence time and poor intermixing
Solution Approach 1:
The extractor divides the continuous extraction process into discrete stages using multiple bed decks (e.g., 3-5 decks), each providing a specific function (immersion, drainage, drying). This segmentation allows simultaneous optimization of residence time for extraction efficiency and throughput for productivity, as each deck can be independently designed and operated at optimal conditions.
Solution Approach 2:
The system employs dynamic control of bed deck positioning and solvent flow rates to adapt to varying feedstock flow rates. By dynamically adjusting the number of immersion decks engaged and solvent circulation rates, the extractor maintains optimal extract recovery across a range of productivity levels.
2Reliability
If residence time is increased to improve extract recovery, then extract recovery improves, but productivity decreases due to reduced feedstock throughput
Solution Approach 1:
By segmenting the extraction process across multiple bed decks, the system achieves total extract recovery equivalent to long residence time while maintaining high throughput. Each deck contributes incrementally to extraction, and the cumulative effect across decks matches or exceeds single-stage long-residence extraction, but with continuous feedstock movement.
Solution Approach 2:
The multi-deck configuration enables continuous extraction action across all decks simultaneously, rather than sequential processing. Feedstock passes through multiple extraction zones in continuous flow, maintaining constant extraction efficiency without interruption or batch processing delays.
3Reliability
If solvent circulation is increased to improve extract recovery, then extract recovery improves, but solvent loss increases and energy requirements increase
Solution Approach 1:
The drainage deck design extracts solvent from the feedstock stream by allowing it to drain back into the solvent pool under gravity. This separation of solvent recovery function from the main extraction process minimizes solvent loss with discharged solids while maintaining extraction efficiency through controlled solvent circulation.
Solution Approach 2:
The system recovers solvent that would otherwise be lost with the discharged solids by implementing drainage decks that return solvent to the circulation pool. This recovery mechanism reduces make-up solvent requirements and minimizes environmental release while maintaining extraction performance.
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 efficiency of the extraction process by allowing residual solvent to drain back into the pool, minimizing solvent carried out with the processed solids and reducing the need for additional solvent, thereby optimizing extract recovery and reducing energy requirements for drying.
Implementation Method 1
the material may travel out of the solvent pool and begin draining entrained solvent along the surface of the non-porous bed deck back into the solvent pool
Data Source
AI summary
An immersion extractor may have a housing that maintains a solvent pool in which solids material being processed is immersed during operation. One or more bed decks can be positioned inside of the housing to provide multiple extraction stages. In some examples, a final bed deck extends from below a solvent level maintained in the housing to above the solvent level such that solids material is conveyed out of the solvent pool and toward a feed outlet at the end of extraction. The bed deck may include a drainage section positioned between the top of the solvent level in the extractor and the feed outlet, allowing solvent to drain out of the solids material before being discharged through the feed outlet, thereby increasing the efficiency of the extraction process.