To provide a method for cracking an olefin-containing hydrocarbon feedstock which is selective towards light olefins in the effluent.
The method includes passing a hydrocarbon feedstock containing olefins through a reactor containing a crystalline silicate selected from an MFI-type crystalline silicate having a silicon/aluminium atomic ratio of at least 180 and an MEL-type crystalline silicate having a silicon/aluminium atomic ratio of from 150 to 800 which has been subjected to a steaming step, at an inlet temperature of from 500 to 600°C, at olefin partial pressure of from 0.1 to 2 bars and the feedstock being passed over the catalyst at an LHSV of from 5 to 30/h to produce an effluent with an olefin content of a lower molecular weight than that of the feedstock. The olefin-containing hydrocarbon feedstock includes a 5C containing overhead cut from a first fractionator, the bottom fraction from the first fractionator being a +6C cut and the +5C hydrocarbon feedstock comprises a bottom fraction from a second fractionator, and the overhead from the second fractionator comprises a 4C-containing cut, optionally further containing 3C hydrocarbons.
VERMEIREN WALTER
KOEN HERREBOUT
| JPH11267510A | 1999-10-05 | |||
| JPH11246871A | 1999-09-14 |
| EP0920911A1 | 1999-06-09 | |||
| EP0921179A1 | 1999-06-09 |
Hiroshi Koshiba