Humidity Control in Chemical Reactors via Gas Pre-Humidification
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Solution Overview
Problem
Controlling humidity in small volume bioreactors is challenging due to evaporation of liquid medium, leading to volume changes that adversely impact reactor operation, and existing systems struggle to prevent condensation in gas transport pathways, causing clogging and liquid loss.
Innovation Solution
A reactor system with a humidifier and liquid trap integrated into gas conduits to control humidity, regulating gas flow rates and preventing condensation, while a moveable gas-permeable membrane separates liquid and gas phases to manage liquid levels and evaporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gas flow rate is increased to improve mass transfer, then oxygen transfer efficiency is improved, but liquid evaporation increases leading to volume loss
Solution Approach 1:
The system pre-humidifies the gas stream in a humidification chamber before it enters the reactor chamber. This preliminary action of adding moisture to the gas prevents subsequent evaporation from the liquid medium, allowing high gas flow rates to be used for mass transfer without proportionally increasing liquid volume loss.
2Loss of substance
If gas flow rate is decreased to reduce evaporation, then liquid volume loss is reduced, but mass transfer efficiency decreases
Solution Approach 1:
By pre-humidifying the gas stream before it contacts the liquid medium, the system creates a saturated or near-saturated gas environment. This allows the gas to accept more oxygen from the liquid without requiring high flow rates, thereby maintaining mass transfer efficiency while reducing evaporation-driven volume loss.
Solution Approach 2:
The system changes the humidity parameter of the gas stream from dry to humidified state. This parameter change alters the gas-liquid equilibrium, reducing the evaporative drive and allowing lower gas flow rates to achieve the same oxygen transfer efficiency.
3Stability of the object's composition
If humidification is added to prevent evaporation, then liquid volume stability is improved, but device complexity increases
Solution Approach 1:
The system introduces a humidification chamber as an intermediary component between the gas source and the reactor chamber. This separate module handles the humidification function independently, allowing the main reactor to focus on cell culture while the intermediary component manages moisture control, thus improving volume stability with modular complexity.
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 effectively inhibits unwanted condensation, reduces liquid loss, and maintains controlled humidity, ensuring stable operation of small volume bioreactors by using a humidifier to maintain liquid levels and a liquid trap to remove vapor, thus preventing clogging and maintaining reactor performance.
Implementation Method 1
a humidifier configured to humidify the gas transported through the reactor chamber gas inlet conduit
Implementation Method 2
a liquid trap configured to remove liquid vapor from the gas within the reactor chamber gas outlet conduit
Data Source
AI summary
Control of humidity in chemical reactors, and associated systems and methods, are generally described. In certain embodiments, the humidity within gas transport conduits and chambers can be controlled to inhibit unwanted condensation within gas transport pathways. By inhibiting condensation within gas transport pathways, clogging of such pathways can be limited (or eliminated) such that transport of gas can be more easily and controllably achieved. In addition, strategies for purging condensed liquid from chemical reactor systems are also described.