Two-Stage Fractionation for Drying Liquid Bromine
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Solution Overview
Problem
Existing methods for drying bromine liquid are inefficient and costly, often requiring expensive corrosion-resistant materials and generating waste due to the use of drying agents or high energy consumption, and do not achieve low enough water and chlorine levels to prevent corrosion at elevated temperatures.
Innovation Solution
A two-stage fractionation process where wet bromine liquid is fractionated to produce dry bromine and bromine-saturated water, followed by further fractionation of the bromine-saturated water to produce bromine-free water, using countercurrent contact with dry bromine vapor and pure water vapor respectively, without the need for drying agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If drying agents are used to remove water from bromine, then water content is reduced, but the drying agent becomes contaminated with bromine and requires regeneration or replacement
Solution Approach 1:
The invention extracts water from bromine through fractional distillation, separating the mixture into water-rich and bromine-rich phases based on their different volatilities and immiscibility, eliminating the need for drying agents that become contaminated
Solution Approach 2:
The process utilizes phase transitions during fractional distillation, where water and bromine transition between liquid and vapor phases at different temperatures, enabling separation without chemical contamination
2Manufacturing precision
If liquid bromine is kept at boiling point to remove water and chlorine, then impurity content decreases, but significant bromine is lost with evaporated water and chlorine
Solution Approach 1:
The distillation process is segmented into multiple stages with different temperature zones, allowing selective removal of water and chlorine at lower temperatures while preserving bromine, rather than boiling all components together
Solution Approach 2:
The process changes temperature parameters gradually through controlled heating zones, removing volatile impurities at lower temperatures before reaching bromine's boiling point, thus preventing bromine loss while achieving impurity removal
3Reliability
If wet bromine is handled using corrosion-resistant materials like tantalum, then corrosion resistance is improved, but equipment cost increases significantly
Solution Approach 1:
The process performs preliminary drying of bromine before it enters handling and storage systems, reducing water content to levels that minimize corrosion, thereby allowing the use of less expensive materials
Solution Approach 2:
Water, the corrosive component, is extracted from bromine through fractional distillation, producing dry bromine that can be handled with standard corrosion-resistant materials rather than expensive tantalum
4Manufacturing precision
If large residence time is used to reduce water and chlorine content, then impurity removal improves, but storage requirements increase and hazard risk increases
Solution Approach 1:
The process uses phase transitions in a fractional distillation column to achieve rapid separation of impurities from bromine, reducing the residence time needed compared to static storage methods while achieving the same purification level
Solution Approach 2:
Temperature and pressure parameters are changed along the distillation column to accelerate the separation process, achieving impurity removal in a compact, continuous operation rather than requiring large-volume, long-duration storage
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 reduces water and chlorine content in bromine to low levels, reducing corrosion risks and eliminating the need for expensive materials and waste treatment, while being economically viable and environmentally friendly.
Implementation Method 1
fractionating a wet bromine liquid in a first fractionator at conditions to produce at least a substantially dry bromine liquid and water saturated with bromine
Implementation Method 2
The water saturated with bromine is fractionated in a second fractionator at conditions to produce at least substantially bromine-free water
Implementation Method 3
contacting wet bromine liquid with substantially dry bromine vapor so as to volatilize substantially all water dissolved in the wet bromine liquid
Implementation Method 4
The first bromine and water vapor are condensed to form at least a first liquid phase comprising bromine saturated with water and a second liquid phase comprising water saturated with bromine
Data Source
AI summary
Processes and systems for drying liquid bromine utilizing two fractionators to produce a substantially dry liquid bromine stream and a substantially bromine-free water stream. Wet bromine liquid may be conveyed to a first fractionator wherein a substantially dry bromine liquid is produced, while a vapor stream from the first fractionator may be condensed into a first liquid phase comprising bromine saturated with water and a second liquid phase comprising water saturated with bromine. The water saturated with bromine may be conveyed to a second fractionator to produce at least substantially bromine-free water.