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Development of Continuous Gas Generation Method for Hydrogen Chloride Using Azeotropic Hydrochloric Acid System
| Content Provider | MDPI |
|---|---|
| Author | Aoyagi, Reiji Sekine, Yoshika Kaifuku, Yuichiro Matsunobu, Kunitoshi |
| Copyright Year | 2022 |
| Description | Standard gases are often prepared using high-pressure gas cylinders. However, it is difficult to accurately prepare a known concentration of hydrogen chloride (HCl) gas using this method because HCl is highly corrosive and adsorptive. In this study, a simple method for the continuous generation of HCl gas was developed using a diffusion tube containing hydrochloric acid and a nitrogen carrier gas. The concentration of HCl produced from this system was almost unstable, but constant gas generation was realized for several hours when azeotropic hydrochloric acid (20.6% HCl in water) and a temperature near the azeotropic point (108.5 °C) were used, resulting in the generation of 103.6 ppm (mean, n = 5) of HCl gas with a relative standard deviation (RSD) of 2.34%. In this case, the percentage of HCl present in the entire gas mixture of HCl and water vapor was 22.5%, which is almost equivalent to the HCl content in the azeotropic hydrochloric acid (20.6%). The HCl concentration could also be controlled by changing the flow rate of the carrier gas. This work demonstrates a simple technique based on the diffusion theory that allows for the constant, controllable generation of a known concentration of HCl gas using an azeotropic hydrochloric acid system. |
| Starting Page | 12 |
| e-ISSN | 23057084 |
| DOI | 10.3390/chemengineering6010012 |
| Journal | ChemEngineering |
| Issue Number | 1 |
| Volume Number | 6 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-02-01 |
| Access Restriction | Open |
| Subject Keyword | ChemEngineering Chemengineering Anesthesiology Dynamic Generation Diffusion Method Hydrogen Chloride (hcl) Hydrochloric Acid Azeotrope |
| Content Type | Text |
| Resource Type | Article |
