Stabilization of hygroscopic salts
US4402862A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 1982 |
| Grant date | Sep 6, 1983 |
| Priority date | — |
| Expiry date | May 20, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C205/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to the stabilization against water uptake of hygroscopic salts useful as catalysts by formation of anhydrous adducts with particulate support materials in order to facilitate manipulation and storage. The adducts comprise a particulate support material and a hygroscopic salt of a species of formula R.sup.1 R.sup.2 R.sup.3 R.sup.4 N, R.sup.1 R.sup.2 R.sup.3 R.sup.4 P, R.sup.1 R.sup.2 R.sup.3 R.sup.4 As, wherein R.sup.1 R.sup.4 which may be identical or different represent hydrogen or alkyl or aryl groups, or of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Cu. Ag, Zn, Cd, Au, Hg, Ga, In, Tl, Sn, Sb or Pb, the salt anion being fluoride, bromide, chloride, sulphate, nitrate, nitrite, cyanate, thiocyanate, peroxide, hydroxide, acetate, formate or comprises phosphorus and oxygen, the salt being coated on the support material thereby being rendered less hygroscopic; provided that when the species is Na, the anion is other than hydroxide and when the species is Tl the anion is fluoride, bromide or chloride. Adducts of salts useful in catalytic fluorination, e.g. R.sup.1 R.sup.2 R.sup.3 R.sup.4 N.sup.+ F.sup. - and CsF are of especial interest.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.