Silane Recovery Distillation for Low-Loss Heavy-Ends Purification
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Solution Overview
Problem
Conventional purification processes for silane-containing streams result in relatively high silane loss and low recovery rates, necessitating the development of more efficient methods to achieve high purity and recovery.
Innovation Solution
A system comprising a heavy-ends distillation column and a silane-recovery distillation column is used to separate and recover silane from streams containing impurities with boiling points greater or less than silane, employing condensation and distillation operations to produce enriched and depleted fractions, thereby minimizing silane loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional purification processes are used, then silane purity can be achieved, but silane loss is relatively high and recovery rate is low
Solution Approach 1:
The purification process is divided into multiple distillation columns with different functions: a light-ends distillation column for removing low-boiling impurities, a heavy-ends distillation column for removing high-boiling impurities, and a silane-recovery distillation column for recovering silane from waste streams. This segmentation allows each column to be optimized for specific separation tasks, minimizing silane loss while achieving high purity
Solution Approach 2:
Instead of discarding the bottoms fraction from the heavy-ends distillation column as waste, the invention recovers silane from this stream through a dedicated silane-recovery distillation column. This transforms a loss stream into a valuable recovery stream, significantly reducing overall silane loss while maintaining product purity
2Productivity
If conventional purification processes are used, then silane purity can be achieved, but recovery rate is low
Solution Approach 1:
The invention implements a silane-recovery distillation column that processes the bottoms fraction from the heavy-ends distillation column to extract and recover additional silane. This recovery step increases overall silane recovery rate by capturing silane that would otherwise be lost, while the purified overhead fraction from this column ensures the recovered silane meets purity specifications
Solution Approach 2:
The system incorporates feedback by recycling the overhead fraction from the silane-recovery distillation column back to the light-ends distillation column feed. This closed-loop approach allows reprocessing of recovered silane to ensure it meets purity requirements, thereby maintaining high recovery rates without compromising product quality
3Loss of substance
If multiple distillation columns are used, then silane recovery is improved, but device complexity increases
Solution Approach 1:
The complex separation task is segmented into three specialized distillation columns, each handling a specific portion of the purification process. This segmentation reduces the complexity burden on any single unit while achieving the overall goal of minimizing silane loss through coordinated operation of the separated functions
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
The system achieves high silane purity and recovery rates by effectively separating silane from impurities, reducing waste streams and enhancing overall process efficiency compared to conventional methods.
Implementation Method 1
a heavy-ends distillation column for producing a silane-enriched overhead fraction and a silane-depleted bottoms fraction relative to the silane-containing stream
Implementation Method 2
a silane-recovery distillation column for producing a silane-enriched overhead fraction and a silane-depleted bottoms fraction relative to the silane-depleted bottoms fraction produced from the heavy-ends distillation column
Data Source
AI summary
Processes and systems for purifying silane-containing streams are disclosed with relatively less silane being lost in impurity streams by use of distillation and/or condensation operations.