Membrane Contactor for Organosilicon Hydrosilylation
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Solution Overview
Problem
Traditional methods of reacting gases with liquids, such as bubbling or sparging, are inefficient, prone to flooding, and result in material waste, with limited control over reaction conditions and product yield.
Innovation Solution
A method involving a dense silicone membrane where a nonvolatile liquid reactant with a platinum group catalyst is contacted with a gaseous reactant containing a carbon-carbon multiple bond, facilitating a hydrosilylation reaction to form an organosilicon product, with the membrane being impermeable to the liquid and permeable to the gas, allowing for controlled and efficient reaction conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gas is bubbled or sparged through liquid, then gas-liquid contact is achieved, but reaction efficiency is poor and gas waste occurs
Solution Approach 1:
A membrane is introduced as an intermediary between the gaseous reactant and liquid reactant. The membrane allows selective permeation of the gas while maintaining liquid containment, enabling controlled gas-liquid contact at the membrane interface without the inefficiencies of traditional bubbling methods
Solution Approach 2:
The patent employs a membrane (thin film) as the reaction interface between gas and liquid phases. This thin film structure provides large surface area for reaction while maintaining precise control over mass transfer, eliminating the need for excessive gas flow rates and associated waste
2Ease of operation
If traditional bubbling methods are used, then gas-liquid mixing occurs, but flooding is prone to happen
Solution Approach 1:
The reaction system is segmented into distinct phases separated by a membrane. The gaseous reactant is supplied to one side of the membrane while the liquid reactant is maintained on the other side, preventing direct mixing and eliminating the flooding phenomenon that occurs in traditional bubble column reactors
3Manufacturing precision
If residence time or reactor volume is not properly controlled, then reaction completeness is affected, but control precision is limited
Solution Approach 1:
The membrane-based system provides inherent feedback control mechanisms where the rate of gas permeation through the membrane is directly proportional to the concentration gradient and membrane surface area. This allows precise control of residence time and reaction completeness by adjusting operational parameters without requiring complex reactor volume control
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 enhances reaction efficiency by reducing waste, improving yield, and providing finer control over reaction parameters, including temperature and flow rates, while avoiding flooding and minimizing equipment costs.
Implementation Method 1
The membrane is substantially impermeable to the liquid reactant and substantially permeable to the gaseous reactant
Data Source
AI summary
Various embodiments disclosed relate to method of forming organosilicon products. In various embodiments, the present invention provides a method of forming an organosilicon product that can include contacting a first side of a silicone membrane with a nonvolatile liquid reactant. The method can include contacting a second side of the membrane with a gaseous reactant. The contacting can be sufficient to react the gaseous reactant with the liquid reactant to form an organosilicon product on the first side of the silicone membrane. The silicone membrane can be substantially impermeable to the liquid reactant and substantially permeable to the gaseous reactant.