Electrolytic Silicide Production from Waste Halides
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Solution Overview
Problem
The silicon and silicone industries face challenges in managing by-products such as silicon tetrachloride (SiCl4) and magnesium chloride (MgCl2), which are produced during processes like chemical vapor deposition and Grignard reactions, and there is a need for reactive silicides as raw materials.
Innovation Solution
An electrolytic process is employed to generate reactive silicides by heating a metal halide salt to create a molten salt, introducing a silane gas, and passing an electric current through it, producing an electrolysis product, which can include metal silicides like Mg2Si, while optionally using ionic liquids to enhance conductivity and reaction selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If by-products like SiCl4 and MgCl2 are produced during silicon and silicone production processes, then the desired silicon and silicone products are manufactured, but the by-products require management and disposal
Solution Approach 1:
The patent converts harmful by-products (SiCl4 and MgCl2) into beneficial reactive silicides through electrolytic reduction. The electrolytic cell reduces these waste materials to valuable products like SiMg2, SiCa2, and other reactive silicides, thereby eliminating waste disposal issues while creating useful raw materials for the silicone and silicon industries.
Solution Approach 2:
The patent changes the physical and chemical parameters of the by-products through electrolytic reduction. By applying electric current in a molten salt environment, the chemical state of SiCl4 and MgCl2 is transformed from stable waste compounds into reactive silicides with different chemical properties and higher value.
2Productivity
If reactive silicides are produced through conventional methods, then raw materials for silicone and silicon industries are provided, but the process is expensive and complex
Solution Approach 1:
The electrolytic process uses the by-products themselves as the raw materials for production. The system is self-sufficient, taking waste output from silicon/silicone production and converting it back into valuable inputs, eliminating the need for separate, complex silicide production facilities.
Solution Approach 2:
The patent merges the waste management function with the raw material production function into a single electrolytic process. Instead of separate processes for disposing by-products and producing silicides, the electrolytic cell performs both functions simultaneously, reducing overall system complexity.
3Productivity
If reactive silicides are produced through conventional methods, then raw materials are provided, but the cost is high
Solution Approach 1:
The patent converts worthless or costly-to-dispose by-products into valuable reactive silicides. The electrolytic reduction process transforms SiCl4 and MgCl2, which would otherwise require expensive disposal or storage, into high-value raw materials like SiMg2 that can be used to produce silanes for the silicone industry.
Solution Approach 2:
The patent changes the economic value parameter of the by-products through electrolytic transformation. By converting low-value waste materials into high-value reactive silicides, the process fundamentally alters the economic equation, turning a cost center into a profit center.
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 effectively generates reactive silicides, such as Mg2Si, from inexpensive by-products like SiCl4 and MgCl2, allowing for the production of silane (SiH4) that can be used in the solar, semiconductor, and electronics industries, while also managing by-products, thereby addressing the need for raw materials and by-product management.
Implementation Method 1
passing an electric current through the molten salt, thereby producing an electrolysis product
Implementation Method 2
heating a salt comprising a metal halide of formula MXa... thereby preparing a molten salt
Data Source
AI summary
An electrolytic process may be used to generate reactive metal silicides with Group 1 metals of the periodic table and/or Group 2 metals of the periodic table, and/or aluminum. Exemplary reactive metal silicides include magnesium silicide (Mg2Si).