Desulfurization, deazotation or dearomatization process of a hydrocarbon feedstock by adsorption over a solid spent sorbent

• Main Authors: NICOLAOS, ALEXANDRE, DIEHL, FABRICE, BURKHARDT, THORSTEN
• Format: Patent
• Language: English; French; German
• Published: 08.09.2004
• Edition: 7
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; CRACKING HYDROCARBON OILS; FUELS; LUBRICANTS; METALLURGY; MINERAL WAXES; PEAT; PERFORMING OPERATIONS; PETROLEUM, GAS OR COKE INDUSTRIES; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; TECHNICAL GASES CONTAINING CARBON MONOXIDE; THEIR RELEVANT APPARATUS; TRANSPORTING

A solid adsorbent is used, which is a used catalyst from one of the following refining processes: hydrotreatment, hydrodesulfurization, hydrodenitration, hydrodemetallization, hydrocracking or hydrogenation of a petroleum fraction. The solid adsorbent has lost 5-80% of its initial specific surface during its first application, preferably 10-60%. In particular, the adsorbent is a used catalyst from a hydrodesulfurization of diesel or petrol. The process is a balanced process, with one adsorption column carrying out an adsorption stage whilst another is regenerated using an appropriate desorbent. Regeneration is in a two-stage process: part of the desulfurized, denitrogenation or dearomatized charge in the porous volume of the adsorber is scrubbed using a desorbent and a partially treated first effluent is recovered. The desorbent is then circulated through the column to recover a second effluent containing the sulfurized, nitrogenated and/or aromatized components which have been desorbed. Alternatively, the solid adsorbent is not regenerated. The desorbent is toluene, xylene, petrol fractions with high aromatic content, steam or a mixture of the above. The hydrocarbon charge to be treated is petrol, diesel, kerosene or a residue from atmospheric distillation. On décrit un procédé de purification par adsorption d'une charge hydrocarbonée mettant en oeuvre un nouvel agent d'adsorption. Cet agent d'adsorption est un solide adsorbant usé ayant servi dans une première application de traitement catalytique de charges hydrocarbonées, ou d'adsorption, et dont les performances d'adsorption ou catalytiques se sont tellement dégradées que son utilisation pour la première application est devenue impossible. L'utilisation de ce solide adsorbant usé pour la purification de charges hydrocarbonées par adsorption ne requiert pas de traitement spécifique au préalable, notamment pas de traitement thermique.