Hydrogen Fluoride Extraction Using Gaseous Reducing Agents
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Solution Overview
Problem
Existing methods for producing anhydrous hydrogen fluoride from aqueous solutions are inefficient, requiring multiple steps, generating waste, and using bulk materials, particularly solid carbon, which complicates the process and results in low purity and toxic byproducts.
Innovation Solution
The method involves interacting the aqueous mixture of hydrogen fluoride and water with reducing agents at high temperatures to produce gaseous reaction products, which are then condensed and distilled, using a reducing agent with the formula CnHmOk, to extract hydrogen fluoride while minimizing waste and process steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If solid carbon is used as a reducing agent, then hydrogen fluoride can be extracted from aqueous solutions, but the process complexity increases due to equipment for storing and transporting bulk materials
Solution Approach 1:
The patent replaces solid carbon with gaseous reducing agents (natural gas, propane, butane, or their mixtures with air or oxygen). This substitution eliminates the need for bulk material handling equipment such as storage silos, conveyors, and dosing systems, thereby significantly simplifying the process flow diagram while maintaining effective hydrogen fluoride extraction from aqueous solutions including azeotropic mixtures.
2Manufacturing precision
If high-purity carbon is used to achieve high purity hydrogen fluoride, then product purity improves, but additional purification stages are required generating toxic waste
Solution Approach 1:
The patent employs gaseous reducing agents (natural gas, propane, butane) that are consumed in the reaction and converted into gaseous products (CO2, H2O, H2) that can be easily separated. This approach eliminates the need for additional purification stages and toxic waste generation associated with solid carbon purification, while achieving high purity hydrogen fluoride (99.95% and above) through the reaction process itself.
3Manufacturing precision
If distillation is used to separate hydrogen fluoride from water, then concentration can be improved, but azeotropic mixtures cannot be separated
Solution Approach 1:
The patent fundamentally changes the separation approach by using chemical reduction reactions at elevated temperatures (400-1000°C) to convert water into gaseous products (H2, CO2, H2O vapor) that can be easily separated from hydrogen fluoride through condensation and distillation. This chemical transformation bypasses the azeotropic limitation of conventional distillation, enabling effective separation of hydrogen fluoride from water in any initial concentration including azeotropic mixtures.
4Manufacturing precision
If a two-step process is used to produce anhydrous hydrogen fluoride, then product purity is achieved, but process time and complexity increase
Solution Approach 1:
The patent combines the reduction of water and the separation of hydrogen fluoride into a single integrated process step. Gaseous reducing agents react with water in the aqueous hydrogen fluoride solution at elevated temperatures, and the resulting gaseous products are directly condensed and distilled to produce anhydrous hydrogen fluoride in one continuous operation, eliminating the need for separate purification stages and significantly reducing process time while maintaining high product purity.
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 effectively extracts hydrogen fluoride from aqueous solutions, including azeotropic mixtures, reducing waste and process complexity, and achieving high purity without the need for additional purification stages or bulk materials.
Implementation Method 1
interacting the aqueous mixture of hydrogen fluoride and water with reducing agents at high temperatures to produce gaseous reaction products
Implementation Method 2
the reaction products are cooled hydrogen fluoride and unreacted residual water are condensed
Data Source
AI summary
Extraction of anhydrous hydrogen fluoride from its aqueous solution is provided. A method provides hydrogen fluoride from aqueous solutions, including the reduction of water component of the aqueous solution at an elevated temperature into carbon oxide, carbon dioxide and hydrogen. The condensation and distillation of the obtained hydrogen fluoride and water vapor are characterized by the fact that the mixture of hydrogen fluoride and water is reduced at a temperature of 800 K and above, the molar ratio of carbon to water in the reducing agent is from 0.5 to 4, and using a reducing agent of the general formula CnHmOk, where k≥0, m>0, and n>0, and the reducing agent may be saturated, unsaturated, aromatic hydrocarbons, oxygen-containing organic compounds, their isomers and their mixtures. The method makes it possible to extract hydrogen fluoride from its mixtures with water in any ratio and from azeotropic mixtures.