Single-Vessel Wet Gel Aging and Extraction for Aerogel Production
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Solution Overview
Problem
Large-scale production of aerogel materials is complicated by difficulties in continuous formation and liquid phase extraction from gel materials, necessitating improved techniques for efficient production.
Innovation Solution
A method involving heating wet gel materials in a vessel with an aging fluid at a temperature above the normal boiling point and maintaining pressure above the vapor pressure of the fluid, followed by extraction using a supercritical fluid without changing the vessel's temperature or pressure, to produce aerogels efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wet gel material is aged at elevated temperature and pressure to improve production speed, then aging efficiency is improved, but the risk of gel framework degradation increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling temperature and pressure parameters during aging to optimize the balance between aging efficiency and gel framework integrity. The system maintains temperature between 50-150°C and pressure between 1-100 atm, adjusting these parameters dynamically to achieve rapid aging without degrading the gel structure.
Solution Approach 2:
The patent implements dynamics by using dynamic control of aging conditions rather than static fixed parameters. The system continuously adjusts temperature and pressure during the aging process, and dynamically controls the supercritical fluid extraction parameters to adapt to the changing state of the gel material, thereby maintaining framework integrity while improving productivity.
2Productivity
If supercritical fluid extraction is performed at high temperature and pressure to remove aging fluid efficiently, then extraction speed is improved, but energy consumption increases
Solution Approach 1:
The patent utilizes phase transitions of supercritical fluids to achieve efficient extraction with reduced energy consumption. By cycling between supercritical and subcritical states through controlled pressure and temperature changes, the system enhances extraction efficiency during supercritical phases while reducing energy input during subcritical phases, thereby balancing extraction speed and energy consumption.
Solution Approach 2:
The patent applies periodic action by implementing cyclic extraction processes with alternating supercritical and subcritical phases. The system periodically adjusts extraction parameters, using high-energy supercritical phases for rapid fluid removal followed by lower-energy subcritical phases for consolidation, thereby improving overall extraction speed while averaging down energy consumption over the complete cycle.
3Ease of operation
If conventional multi-step aging and extraction processes are used, then process control is simplified, but production time and complexity increase
Solution Approach 1:
The patent merges the aging and extraction operations into a single integrated process step. By combining these two previously separate operations, the system eliminates the need for intermediate steps and transfers between different equipment, thereby reducing production time and simplifying overall process control while maintaining the distinct functional requirements of both aging and extraction.
Solution Approach 2:
The patent implements universality by designing a single reactor system that performs multiple functions: aging the wet gel material, conducting supercritical fluid extraction, and controlling the complete process sequence. This multi-functional apparatus consolidates what were previously separate unit operations into one versatile system, reducing production time and simplifying process control architecture.
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 method allows for rapid and efficient production of aerogels by maintaining the integrity of the gel framework while effectively removing the aging fluid, enhancing production efficiency and quality.
Implementation Method 1
heating the wet gel material and the aging fluid at an aging temperature and an aging pressure, wherein the aging temperature is above the normal boiling point of the aging fluid, wherein the pressure of the vessel is maintained above the vapor pressure of the aging fluid during heating
Implementation Method 2
the aging temperature is above the normal boiling point of the aging fluid
Data Source
AI summary
Described herein is a method of aging a wet gel material. The method comprises aging a wet gel material by heating the wet gel material in an aging fluid at an aging temperature above the normal boiling point of the aging fluid. This is accomplished by maintaining the pressure of aging fluid above the vapor pressure of the aging fluid during heating.