Monosilane Production via Dichlorosilane Disproportionation
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Solution Overview
Problem
Existing processes for producing monosilane require high energy consumption and large apparatus sizes due to low conversion ratios and inefficient logistics in chlorosilane processing, necessitating a reduction in energy usage and simplification of material handling.
Innovation Solution
A process utilizing a monosilane production apparatus with a reaction column, upper condensers, and a catalyst, where dichlorosilane is supplied to the upper stage, and the resultant mixture is recycled and contacted with the catalyst to produce a monosilane-rich gas, reducing energy consumption and by-product formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If trichlorosilane is used as feed material for monosilane production, then continuous production is achieved, but energy consumption increases and logistics complexity increases
Solution Approach 1:
The patent changes the feed material parameter from trichlorosilane to dichlorosilane, which fundamentally alters the reaction stoichiometry. This parameter change reduces the energy input required for the disproportionation reaction and simplifies the by-product management system, thereby reducing overall energy consumption while maintaining continuous production capability
Solution Approach 2:
The patent extracts and eliminates the complex logistics control system required for trichlorosilane processing. By using dichlorosilane as feed material, the system removes the need for seamless feed material supply and by-product collection infrastructure, simplifying the overall production system while maintaining continuous operation
2Device complexity
If conversion reaction equilibrium is not shifted, then reaction conditions are simple, but conversion ratio remains low requiring large apparatus size
Solution Approach 1:
The patent introduces dynamic removal of produced monosilane from the reaction system. By continuously extracting monosilane as it forms, the system prevents the reaction from reaching equilibrium, thereby maintaining a continuous driving force for the disproportionation reaction. This dynamic approach increases conversion ratio without requiring overly complex reaction conditions
Solution Approach 2:
The patent implements continuous removal of the reaction product (monosilane) from the reaction zone. This continuous action prevents back-reaction and maintains the reaction driving force, enabling high conversion ratios in a compact apparatus while keeping the reaction system relatively simple
3Productivity
If multiple chlorosilane species are processed, then production amount increases, but logistics control burden increases
Solution Approach 1:
The patent extracts and eliminates the need for complex multi-material logistics control by selecting dichlorosilane as the sole feed material. This simplification removes the burden of coordinating multiple feed streams and by-product collections, making the operation significantly easier while maintaining high production throughput
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 process efficiently produces monosilane with reduced energy consumption and simplified logistics, achieving higher conversion rates and minimizing equipment size by using only two moles of dichlorosilane to produce one mole of monosilane and reducing by-product silicon tetrachloride formation.
Implementation Method 1
supplying a catalyst to said upper stage of the reaction column via a lower injection point
Implementation Method 2
introducing a resultant mixture containing monosilane, monochlorosilane, dichlorosilane, and trichlorosilane from the top portion of the reaction column to the plurality of upper condensers
Implementation Method 3
withdrawing a bottom recovery liquid containing tetrachlorosilane, trichlorosilane and the catalyst from the bottom portion of the reaction column, introducing the bottom recovery liquid into the evaporation tank, and recycling the catalyst recovered from the bottom portion of the evaporation tank
Data Source
AI summary
A process for continuously producing monosilane by means of an apparatus comprising a reaction column, at least two upper condensers each with a reflux feed pipe, a bottom reboiler and an evaporation tank connected to a bottom portion of the reaction column; the process comprising: a) supplying dichlorosilane or a mixture of chlorosilanes to an upper stage of the reaction column via an upper feed injection point b) supplying a catalyst to said upper stage of the reaction column via a lower injection point c) introducing the resultant mixture from the top portion of the reaction column to the plurality of upper condensers d) separating monosilane from condensates in the upper condensers e) recycling the condensates through the reflux feed pipes to the upper stage of the reaction column f) bringing the condensates into contact with the catalyst in the reaction column.