Flexible steam cracking process and corresponding steam cracking facility
US5972206A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 25, 1997 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Jun 25, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S585/95
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A flexible steam cracking process for hydrocarbon feeds comprises injection of particles with an average size of between 0.02 mm and 4 mm, at a circulation rate in indirect transfer line exchangers (4) of 20 to 180 m/s, and in a sufficient quantity to limit the increase in temperature at the outlet to the exchangers (4) to a value of less than 100.degree. C. per month, into at least one point upstream of an indirect transfer line exchanger (4), cracking zone (2) remaining in communication with downstream means (6) for the treatment of cooled effluents. At least 70% by weight of the quantity of injected particles is introduced between the outlet to the cracking zone (2) and the tubes of the indirect transfer line exchanger (4). Chemical decoking is carried out in the tubes of the cracking zone at time intervals of less than 4 months by establishing accelerated coke gasification conditions, for example by injecting compounds which catalyse gasification by steam, or by decoking in air and/or steam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.