Silane Production in Baffled Bubble Column Reactor
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Solution Overview
Problem
Current methods for producing silane are economically challenged due to high starting material costs and require improvements in reactor productivity and conversion efficiency.
Innovation Solution
A process involving a reaction vessel with baffles creating multiple zones, where a halosilane and a hydride react to produce silane, with the reaction mixture being agitated and the upper zone cooled, allowing for counter-current flow of reactants and products to enhance conversion without direct measurement of concentrations, using a baffle-defined lower and upper reaction zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single reaction zone is used, then the reactor structure is simple, but conversion efficiency and productivity are limited
Solution Approach 1:
The reaction vessel is divided into multiple reaction zones (first, second, and third zones) separated by baffles, allowing the reaction process to occur in stages. This segmentation enables improved conversion efficiency and productivity while maintaining a relatively simple overall structure using standard baffle components.
2Productivity
If high conversion efficiency is achieved through complex temperature control, then reactant conversion improves, but system complexity and cost increase
Solution Approach 1:
Different temperature conditions are applied to different reaction zones: the first zone operates at a first temperature, the second zone at a second temperature, and the third zone at a third temperature. This local differentiation of temperature conditions optimizes conversion efficiency in each zone without requiring a complex centralized control system.
3Ease of manufacture
If starting material costs are reduced, then production cost decreases, but conversion efficiency may be affected
Solution Approach 1:
The process utilizes specific parameter ranges including temperature (20-100°C), pressure (1-10 atm), and reaction time (1-24 hours) to optimize the reaction between silicon tetrafluoride and aluminum tetrahydride. These parameter optimizations enable high conversion efficiency with cost-effective starting materials.
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 increases conversion efficiency of reactants, reduces costs by optimizing temperature control and flow rates, and produces high-purity silane with minimal need for specialized personnel or equipment for concentration measurements.
Implementation Method 1
A feed gas comprising a halosilane is introduced into the reaction vessel to bubble the feed gas through the reaction mixture
Implementation Method 2
the upper reaction zone being cooled
Implementation Method 3
The reaction mixture is agitated
Implementation Method 4
The hydride reacts with the halosilane to produce silane and a halide salt
Data Source
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AI summary
Methods for producing silane by reacting a hydride and a halosilane are disclosed. Some embodiments involve use of a column which is not mechanically agitated and in which reactants may be introduced in a counter-current arrangement. Some embodiments involve use of a baffled column which has multiple reaction zones.