Hydrocarbon cracking apparatus
US4997525A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1989 |
| Grant date | Mar 5, 1991 |
| Priority date | — |
| Expiry date | Sep 7, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G2400/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the preparation of olefins by the cracking of hydrocarbons consisting in passing a mixture of hydrocarbons and steam flowing in a cracking tube disposed inside a radiation zone of a furnace. The process is characterized in that an increase of the cracking temperature of the mixture between the inlet and the outlet of the radiation zone is associated to a non-homogeneous distribution of the thermal power of the furnace, greater at the beginning of the cracking tube than at the end, and to a reaction volume which is greater in the second half of the length tube than in the first one. The present invention relates also to a cracking furnace in which between the inlet and the outlet of the radiation zone the diameter of the cracking tube increases and the thermal power of the burners used to heat the cracking tube decreases. The decreasing thermal power may be applied by arranging burners of different sizes spaced along the cracking tube with the burners of larger size disposed nearer the inlet end of the cracking tube than the burners of smaller size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.