Remove HF from BF3

Ma Chunlei

Reference 1: 柳彤 , 氟化钠吸附氟化氢最佳工艺参数测定 [J]. 舰船科学技术 , 2009, 31(2): 109-111.

Content:Qualitative research: performance of HF adsorption on NaF pellets;Quantitative research: inlet concentration; inlet temperature; inlet pressure.

Chemical adsorption: NaF + HF NaHF2

Reversible reaction：T>250 ℃ (280℃-300℃)

NaHF2 NaF + HF

Fig. 1 Flow chart of adsorbent experiment

Conclusion：

Fig. 2 Impact of temperature to efficiency

Conclusion：

Fig. 3 Impact of pressure to efficiency

Conclusion：

Fig. 4 Impact of flux to efficiency

Reference 2: Afzal. S. & Rahimi. A. (2010). Experimental study of hydrogen fluoride adsorption on sodium fluoride. Journal of Industrial and Engineering Chemistry. 16, 147-151.

Purpose ： Remove HF in F2

Material ：An adsorption column is made from stainless steel;A cylindrical shell is installed around the adsorption column;The outlet HF concentration is measured by a UV-IR analyzer;101-L capsule-Pure and vapor-free HF and N2

Nitrogen gas as inert;Sodium fluoride pellets;

Tips：A constant flow rate;Water pass through the shell;The outlet concentration recorded continuously;Until the bed completely saturated;The inlet concentration of HF:2~15mol%;The experiments conducted at 22 and 54℃.

Table 1Experimental conditions and results for column test runs.

Fig. 2. Hydrogen fluoride isotherms on sodium fluoride at 22 and 54 ℃

Fig. 3. Breakthrough curve of hydrogen fluoride adsorption on sodium fluoride.

Fig. 4. Effect of temperature on the breakthrough curves of HF adsorption on NaF pellets.

The breakthrough curves of HF adsorption on NaF pellets for different inlet concentrations.

• Reference 3: Afzal. S. & Rahimi. A. (2010). Modeling hydrogen fluoride adsorption by sodium fluoride. Journal of Industrial and Engineering Chemistry. 16, 978-985.

• While the feed gas velocity decreases, the HF adsorption capacity on NaF is significantly enhanced and there is a delay in breakthrough time.

• The adsorption capacity of HF on NaF decreases slightly when inlet HF concentration increases.

Thank you!