Cyclohexasilane Distillation Purity and Stability
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Solution Overview
Problem
The challenge lies in efficiently purifying cyclohexasilane to high purity for applications in semiconductors and solar cells, as existing methods face low purification efficiency and stability issues due to spontaneous combustion, reactivity with air and water, and the need for specialized storage and apparatus cleaning to prevent impurity formation.
Innovation Solution
The method involves distilling cyclohexasilane under specific pressure and temperature conditions, using airtight containers with inert gases, and a multi-step cleansing process to achieve high purity and stability, while also treating exhaust gases to remove hazardous silane compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cyclohexasilane is distilled at a low temperature, then the condensation is certain, but the evaporation rate is low and solidified matter adheres to the condenser causing obstruction
Solution Approach 1:
The patent applies parameter changes by controlling the distillation temperature within a specific range (25-100°C) and adjusting the heating rate based on the boiling point of cyclohexasilane. The process dynamically adjusts temperature parameters to maintain optimal evaporation rate while preventing condenser obstruction, resolving the contradiction between reliable condensation and productive evaporation.
2Productivity
If cyclohexasilane is distilled at a high temperature, then the evaporation rate increases, but distillation stops in the midst reducing purification efficiency
Solution Approach 1:
The patent implements dynamics by continuously adjusting the heating temperature during the distillation process based on the boiling point of cyclohexasilane and the state of the system. The heating rate is dynamically controlled to prevent overheating and ensure continuous distillation, resolving the contradiction between high evaporation rate and distillation continuity.
3Quantity of substance
If cyclohexasilane is stored in a container, then mass production and storage are enabled, but spontaneous combustion and oxidation occur when contact with air
Solution Approach 1:
The patent applies inert atmosphere by storing cyclohexasilane in a container filled with inert gas (nitrogen or argon) to prevent contact with air. This eliminates oxygen and moisture that would cause spontaneous combustion and oxidation, resolving the contradiction between storage capacity and storage stability.
4Manufacturing precision
If conventional purification methods are used for cyclohexasilane, then purification is attempted, but purification efficiency remains very low
Solution Approach 1:
The patent applies parameter changes by optimizing the distillation temperature range (25-100°C) and controlling the heating rate to match the boiling point of cyclohexasilane. These parameter adjustments significantly improve purification efficiency while achieving high purity (98% or more), resolving the contradiction between manufacturing precision and productivity.
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 approach results in cyclohexasilane with a purity of 98% or more, improved storage stability, and efficient apparatus cleaning, ensuring high purity and safety in handling and storage, while safely exhausting gases from silicon hydride compound handling facilities.
Implementation Method 1
when cyclohexasilane is purified by distillation
Implementation Method 2
the evaporation rate is low
Implementation Method 3
the temperature of a condenser is necessary to be low in order to certainly condense vaporized cyclohexasilane
Implementation Method 4
cyclohexasilane has spontaneous combustion characteristics that reacts with oxygen in the air when comes into contact with air and spontaneously ignites, and is oxidized to produce a siloxane compound as an impurity
Implementation Method 5
a method for storing a silicon hydride compound
Implementation Method 6
cyclohexasilane is ring-opening polymerized by light and heat
Implementation Method 7
cyclohexasilane is ring-opening polymerized by light and heat
Data Source
AI summary
High purity cyclohexasilane and a method for increasing the purification efficiency thereto are provided. The method for producing cyclohexasilane of the present invention is characterized in that, in distilling crude cyclohexasilane to obtain purified cyclohexasilane, the absolute pressure during distillation is set to 2 kPa or less, and the heating temperature of crude cyclohexasilane is set to 25 to 100° C. The cyclohexasilane of the present invention contains pure cyclohexasilane at a rate of 98% by mass or more and 100% by mass or less.