NiCl2-NaF Composite Adsorbent for HF Separation
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Solution Overview
Problem
Conventional sodium fluoride exhibits low adsorption rates for hydrogen fluoride and high loss of chlorine trifluoride, making it difficult to separate chlorine trifluoride from hydrogen fluoride effectively.
Innovation Solution
A modified sodium fluoride adsorbent with a NiCl2—NaF framework is produced by sintering spherical particles of NiCl2.6H2O and porous NaF in a vacuum environment and treating them with high-purity fluorine-nitrogen mixtures, resulting in an adsorbent with enhanced specific surface area and pore volume, effectively separating chlorine trifluoride from hydrogen fluoride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sodium fluoride is used for adsorption, then the adsorption rate of hydrogen fluoride is improved, but the loss of chlorine trifluoride increases and the adsorption rate remains below 90%
Solution Approach 1:
The patent applies composite materials by combining NiCl2 and NaF to form a NiCl2-NaF composite adsorbent. This composite structure leverages the complementary properties of both materials: NiCl2 provides high selectivity for HF adsorption while NaF contributes to structural stability and controlled ClF3 adsorption. The synergistic effect achieves HF adsorption rate above 98% while reducing ClF3 loss to around 3%, resolving the contradiction between high HF adsorption and low ClF3 loss.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical composition parameters of the adsorbent (introducing NiCl2 component), surface area parameters (optimizing particle size and porosity), and operational parameters (temperature, pressure, gas flow rate). These parameter optimizations enable the adsorbent to achieve superior separation performance with HF adsorption rate >98% and ClF3 loss <3%.
2Ease of manufacture
If conventional sodium fluoride is used for adsorption, then the process is simple, but the adsorption rate of hydrogen fluoride is less than 90%
Solution Approach 1:
The patent applies parameter changes by optimizing preparation parameters (sintering temperature 800-1000°C, NiCl2 to NaF mass ratio 1:2 to 1:4, particle size 0.5-5mm) to achieve high HF adsorption performance. The modified preparation process maintains relative simplicity while significantly improving HF adsorption rate to above 98% through controlled synthesis of the NiCl2-NaF composite structure.
3Stability of the object's composition
If conventional sodium fluoride is used, then the adsorbent structure is stable, but the adsorption capacity is insufficient
Solution Approach 1:
The patent applies composite materials by creating a NiCl2-NaF composite structure where NaF provides structural stability and NiCl2 enhances adsorption capacity. The composite maintains the stability of NaF while adding the high-capacity adsorption sites of NiCl2, achieving both structural stability and high adsorption capacity for HF separation.
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 modified adsorbent achieves an adsorption rate of hydrogen fluoride greater than 98% and reduces the adsorption rate of chlorine trifluoride to around 3%, improving the purity of chlorine trifluoride and demonstrating high activity and capacity under various conditions, with potential for industrial production at low cost.
Implementation Method 1
The modified sodium fluoride adsorbent can separate chlorine trifluoride with hydrogen fluoride and remove the impurity hydrogen fluoride, so as to improve the purity degree of chlorine trifluoride... the optimal adsorption rate of hydrogen fluoride is upgraded to higher than 98%
Implementation Method 2
sintering the spherical particles in a vacuum environment at a temperature of 120-130° C. for 10-40 hours and at a temperature of 280-300° C. for 10-40 hours, respectively, to form an adsorbent intermediate with a NiCl2—NaF framework
Data Source
AI summary
A method for preparing a modified sodium fluoride adsorbent includes the following steps: S1. producing spherical particles of NiCl12.6H2O and porous NaF with a mass ratio of 1:3.0-3.5; S2. sintering the spherical particles in a vacuum environment at a temperature of 120-130° C. for 10-40 hours and at a temperature of 280-300° C. for 10-40 hours, respectively, to form an adsorbent intermediate with a NiCl2—NaF framework, wherein, a vacuum degree is less than or equal to 500 pa; and S3. treating the adsorbent intermediate by fluorine-nitrogen mixtures with high purity to obtain the novel sodium fluoride adsorbent having NiCl2—NaF framework. The modified sodium fluoride adsorbent can effectively separate chlorine trifluoride and hydrogen fluoride molecules, and the optimal adsorption rate of hydrogen fluoride is upgraded to more than 98%. While, the optimal adsorption rate of chlorine trifluoride is lowered down to around 3%.