Use of salt hydrates as reversible absorbents of acid gases
US4973456A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1988 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Oct 24, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10K1/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention is a process for reversibly absorbing acid gases, such as CO.sub.2, H.sub.2 S, SO.sub.2, HCN and the like from gas mixtures. The gas mixture containing one or more of these acid gases is contacted with a hydrated salt of the composition EQU A.sub.x.sup.m+ B.sub.y.sup.n-.rH.sub.2 O wherein A.sup.m+ is a cation, B.sup.n- is the conjugate base of a weak acid having a pKa corresponding to an ionization constant of the acid greater than 3 as measured in dilute aqueous solution, m and n are independently integers from 1-4, x and y are integers such that the ratio of x to y provides a neutral salt and r is any number greater than zero up to the maximum number of moles of water which can be bound to the salt. The salt hydrate reversibly absorbs the acid gas from the gas mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.