Method for sweetening an olefinic petrol of sulphide-type compounds

• Main Authors: Leflaive, Philibert, Asteris, Diamantis, Godard-Pithon, Marie, Pucci, Annick, Lopez Garcia, Clementina, Gornay, Julien
• Format: Patent
• Language: English
• Published: 03.11.2020
• Subjects: ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE ORUNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; CRACKING HYDROCARBON OILS; FIRELIGHTERS; FUELS; FUELS NOT OTHERWISE PROVIDED FOR; LIQUEFIED PETROLEUM GAS; LUBRICANTS; METALLURGY; MINERAL WAXES; NATURAL GAS; 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; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BYSUBCLASSES C10G, C10K; TECHNICAL GASES CONTAINING CARBON MONOXIDE; THEIR RELEVANT APPARATUS; TRANSPORTING

The present invention relates to a method for reducing the content of sulphide-type compounds of formula R1-S-R2, with R1 and R2 selected from methyl (CH3) and ethyl (C2H5) radicals, of a petrol containing diolefins, monoolefins and sulphur, in which: A) brought into contact in a reactor are the petrol as a mixture with a portion of the light petrol cut recycled from step C) and hydrogen and with a catalyst A comprising at least one metal from group VIb and at least one non-noble metal from group VIII which are deposited on a support, so as to produce an effluent having a content of diolefins and a content of sulphide-type compounds of formula R1-S-R2, with R1 and R2 selected from methyl (CH3) and ethyl (C2H5) radicals that are lower than that of the initial petrol; B) the effluent resulting from step A) is sent to a fractionating column in order to separate at the top a light petrol cut containing hydrocarbons having less than 6 carbon atoms per molecule and at the bottom of the column a heavy petrol cut containing hydrocarbons having 6 and more than 6 carbon atoms per molecule; C) a portion of the light petrol cut resulting from step B) is recycled in the reactor of step A) with a recycle ratio of between 0.1 and 0.7.