Dehydrogenation and cracking of C.sub.3 and C.sub.4 hydrocarbons to less saturated hydrocarbons
US4620051A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1985 |
| Grant date | Oct 28, 1986 |
| Priority date | — |
| Expiry date | Jul 25, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2523/34
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of selectively cracking C.sub.3 and C.sub.4 hydrocarbons to C.sub.2 hydrocarbons, particularly ethylene, in which a body of cracking catalyst is established in a reaction zone and the feed hydrocarbons are passed through the body of catalyst while maintaining the conditions sufficient to convert the feed hydrocarbons to product hydrocarbons, including, a temperature in the upstream end of the body of catalyst at least about 100.degree. C. below the temperature in the downstream end of the body of catalyst. The cracking catalyst is preferably selected from the group consisting of: at least one oxide of manganese and at least one oxide of magnesium; at least one oxide of manganese and at least one oxide of at least one metal selected from the group consisting of Lanthanum Series metals, preferably lanthanum or cerium, and niobium; at least one oxide of iron and at least one oxide of magnesium; and at least one oxide of iron and at least one oxide of a Lanthanum Series metals or niobium. The active life of the catalyst, for the selective conversion to C.sub.2 hydrocarbons and particularly ethylene, is extended by adding promoting amounts of oxides of calcium, strontium, bariu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.