| 摘要 |
The present invention relates to an improved process for the production of very high quality oil bases with simultaneous production of high quality middle distillates starting from feedstock that can be obtains ined from the distillation of crude oil or that can be obtained from units for transformation and refining of the latter. The process according to the invention comprises a converting pretreatment stage of the feedstock and a catalytic dewaxing stage. The converting pretreatment stage takes place in the presence of a catalyst that contains at least one noble metal that is deposited on an acid substrate that is in particular silica/alumina. The catalytic dewaxing takes place in the presence of a catalyst with a zeolite base that is preferably selected from the group that is formed by zeolites of the TON-structural type (theta-1, ISI-1, ZSM-22, KZ-2, NU-10), and the zeolites ZSM-48, ZBM-30, EU-2, EU-11, ferrierite, EU-1 and EU-13, whereby the catalyst also contains at least one hydro-dehydrogenating element and at least one molecular sieve. Flexible process for preparing oil bases and middle distillates with a preliminary conversion stage followed by subsequent catalytic dewaxing The present invention relates to an improved process for the production of very high quality oil bases with simultaneous production of high quality middle distillates starting from feedstock that can be obtains ined from the distillation of crude oil or that can be obtained from units for transformation and refining of the latter. The process according to the invention comprises a converting pretreatment stage of the feedstock and a catalytic dewaxing stage. The converting pretreatment stage takes place in the presence of a catalyst that contains at least one noble metal that is deposited on an acid substrate that is in particular silica/alumina. The catalytic dewaxing takes place in the presence of a catalyst with a zeolite base that is preferably selected from the group that is formed by zeolites of the TON-structural type (theta-1, ISI-1, ZSM-22, KZ-2, NU-10), and the zeolites ZSM-48, ZBM-30, EU-2, EU-11, ferrierite, EU-1 and EU-13, whereby the catalyst also contains at least one hydro-dehydrogenating element and at least one molecular sieve. |
