Forward Osmosis Membrane Concentration for Organic Solvent Feeds
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Solution Overview
Problem
Existing methods for concentrating feed solutions containing organic solvents face challenges such as high energy consumption, membrane clogging, and inefficient concentration due to limitations in flux and osmotic pressure, particularly in forward osmosis methods.
Innovation Solution
A feed solution flow concentration system utilizing a forward osmosis membrane with a low water content, where the feed and draw solutions flow in countercurrent or cocurrent fashion, allowing organic solvents to migrate into the draw solution, thereby concentrating the feed solution without heating or special pretreatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If vacuum distillation method is used to concentrate feed solution, then high concentration level is achieved, but heating is required which alters quality of active components and consumes large energy
Solution Approach 1:
The patent replaces the thermal field (heating) with a membrane separation system. Forward osmosis uses osmotic pressure difference to drive solvent migration through the membrane, eliminating the need for thermal heating while achieving high concentration levels. This substitutes a mechanical/chemical separation mechanism for a thermal process.
Solution Approach 2:
The forward osmosis membrane acts as an intermediary that facilitates selective solvent migration. The draw solution serves as another intermediary that creates the osmotic pressure gradient. These intermediaries enable concentration without direct thermal contact with the feed solution, preserving active component quality.
2Use of energy by moving object
If reverse osmosis method is used to concentrate feed solution, then energy consumption is acceptable, but membrane clogging occurs requiring pretreatment to remove solids and unwanted organic materials
Solution Approach 1:
The patent inverts the traditional approach by using forward osmosis instead of reverse osmosis. In forward osmosis, the feed solution is not pressurized; instead, the draw solution creates the driving force. This inversion eliminates the high pressure that causes membrane clogging in reverse osmosis, removing the need for extensive pretreatment.
Solution Approach 2:
The patent changes the pressure parameter from high pressure (reverse osmosis) to atmospheric or low pressure (forward osmosis). This parameter change fundamentally alters the operating conditions, preventing membrane clogging while maintaining acceptable energy consumption levels.
3Use of energy by moving object
If forward osmosis method is used to concentrate feed solution, then energy consumption is low and no heating or pressurization is required, but concentration efficiency is insufficient
Solution Approach 1:
The patent optimizes several parameters simultaneously: draw solution concentration, feed solution flow rate, temperature, and pH. These parameter adjustments enhance the osmotic pressure gradient and mass transfer rate, significantly improving concentration efficiency while maintaining low energy consumption.
Solution Approach 2:
The patent employs dynamic control of flow rates and operational conditions to maximize concentration efficiency. By continuously optimizing the feed and draw solution flow rates based on process conditions, the system maintains high productivity without requiring excessive energy input.
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
The system achieves low energy consumption and efficient concentration of feed solutions containing organic solvents, enabling high concentration levels without membrane clogging or quality alteration, suitable for pharmaceuticals and other solutes.
Implementation Method 1
Forward osmosis is a technique in which the difference in osmotic pressure is used as the driving force for separation and concentration of the solvent from the feed solution
Implementation Method 2
a feed solution and a draw solution having higher osmotic pressure than the feed solution are contacted through a forward osmosis membrane to cause diffusion of the solvent from the feed solution into the draw solution
Data Source
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AI summary
Provided is a raw material flow concentration system that causes an induced liquid flow and a raw material liquid flow that includes an organic solvent as a solvent to flow in a counter flow or parallel flow through a forward osmosis membrane, and causes the organic solvent included in the raw material liquid flow to pass through the forward osmosis membrane to move to the induced liquid flow, and thereby obtains a concentrated raw material liquid flow that is a concentrated raw material liquid flow and a diluted induced liquid flow that is a diluted induced liquid flow, said raw material flow concentration system wherein the water content of the forward osmosis membrane is 300 g/m2 or less.