Modified sodium fluoride adsorbent for special purpose, preparation and application thereof
US11517875B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2022 |
| Grant date | Dec 6, 2022 |
| Priority date | — |
| Expiry date | May 30, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J20/3078
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
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%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.