Storage and safe delivery of hazardous specialty gases by acid/base reactions with ionic polymers
US6277342A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1999 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Aug 23, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF17C11/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for delivering a gas having a proton affinity of less than 866 kJ/mol is disclosed. A support including at least one polymer sufficiently acidic to protonate the gas is contacted with the gas to protonate the gas. The protonated gas condenses to form a solid salt which is sorbed by the support. The gas is dispensed by deprotonating the sorbed solid salt to regenerate said gas. The at least one polymer of the support has a first Hammett acidity value greater than a second Hammett acidity value of a conjugate acid of the gas. Also provided is an apparatus for performing the method. The invention is especially useful for storing, transporting and delivering hazardous gases, such as arsine and phosphine. The polymer can be polymeric sulfonic acids, polymeric perfluoroalkylsulfonic acids, fluorinated sulfonic acid polymers, cross-linked sulfonated polystyrene-divinylbenzene macroreticular copolymers, carboxylic acid polymers, halogenated carboxylic acid functionalized polymers and mixtures thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.