Organic Solvent Recovery With Three-Tank Cyclic Drying
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Solution Overview
Problem
Existing organic solvent recovery systems face inefficiencies due to high dew-point temperatures and moisture adsorption, leading to decreased adsorption efficiency and increased energy consumption.
Innovation Solution
An organic solvent recovery system with three treatment tanks that alternately perform adsorption, desorption, and drying steps, utilizing a water vapor supplier, drying gas, and an organic solvent concentration device to improve solvent removal rates while reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the adsorption step is executed in the adsorbing material of the organic solvent recovery device and subsequently the adsorption step is further executed with the adsorbing material of the backup treatment device, then the organic solvent removal rate is improved, but the operation energy of the entire facility increases
Solution Approach 1:
The system is divided into multiple treatment tanks (first treatment tank, second treatment tank, third treatment tank) that operate in different phases (adsorption, desorption, drying). This segmentation allows continuous operation where one tank is always ready for adsorption with low-dewpoint gas, while others undergo regeneration, thereby maintaining high removal rates without proportionally increasing energy consumption.
Solution Approach 2:
The drying step is performed in advance before the adsorption step to prepare the adsorbing material. By introducing drying gas to reduce the dew-point temperature of the adsorbing material before adsorption begins, the system ensures optimal adsorption conditions are ready beforehand, improving efficiency without requiring additional energy during the adsorption phase.
2Productivity
If the adsorption column is filled with high-temperature water vapor after the desorption step, then the desorption of organic solvent is achieved, but the dew-point temperature of the discharged treated gas increases, decreasing adsorption efficiency
Solution Approach 1:
The system alternates between desorption (using high-temperature water vapor) and drying (using low-temperature drying gas) in periodic cycles. Each treatment tank undergoes these phases sequentially, allowing the dew-point temperature to be raised for effective desorption then lowered before the next adsorption cycle, maintaining efficiency throughout operation.
Solution Approach 2:
A drying gas is introduced as an intermediary substance between the water vapor desorption step and the subsequent adsorption step. This drying gas absorbs excess moisture from the adsorbing material, acting as a mediator that transitions the system from a high-dewpoint state to a low-dewpoint state, thereby preparing the material for efficient adsorption without directly using the high-temperature water vapor.
3Quantity of substance
If much moisture in the treated gas is adsorbed by the adsorbing material of the backup treatment device, then the moisture is removed from the gas, but the desorbed gas has high dew-point temperature, increasing humidity of the organic-solvent-containing gas
Solution Approach 1:
The harmful high-dew-point desorbed gas is extracted from the main gas flow and directed to a separate drying treatment tank. By taking out this problematic stream and treating it separately with drying gas, the system removes the source of high humidity from the organic-solvent-containing gas without compromising the overall moisture removal function.
Solution Approach 2:
The high-dew-point gas that would normally be harmful is converted into a useful drying medium. The desorbed gas containing moisture is introduced into the drying treatment tank where it serves as the drying gas for regenerating the adsorbing material, thereby converting a waste stream into a resource that aids the drying process.
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 enhances solvent recovery efficiency by maintaining low dew-point temperatures and reducing moisture adsorption, thereby improving the overall removal rate without increasing facility size or energy use.
Implementation Method 1
an organic solvent recovery device that includes a first adsorbing material capable of adsorbing and desorbing an organic solvent
Implementation Method 2
a desorption treatment of desorbing the organic solvent from the first adsorbing material with introduced water vapor
Implementation Method 3
a water vapor supplier that introduces the water vapor into the treatment tank selected from among the treatment tanks
Implementation Method 4
a drying treatment of drying the first adsorbing material with an introduced drying gas
Implementation Method 5
an organic solvent concentration device that includes a second adsorbing material capable of adsorbing and desorbing the organic solvent, adsorbs, with the second adsorbing material, the organic solvent from the first treated gas
Data Source
AI summary
An organic solvent recovery system of the present invention includes: an organic solvent recovery device that includes a first adsorbing material, and further includes at least three treatment tanks that alternately perform an adsorption treatment of adsorbing the organic solvent and of discharging a first treated gas, a desorption treatment of desorbing the organic solvent and of discharging a desorbed gas, and a drying treatment of drying the first adsorbing material and of discharging a dry outlet gas; an organic solvent concentration device that includes a second adsorbing material, adsorbs the organic solvent from the first treated gas, discharges a second treated gas, desorbs the organic solvent with a desorbing gas, and discharges the organic solvent as a concentrated gas; and a return flow path that returns the concentrated gas.