| 主权项 |
1. Process for the elimination of mercury contained in a heavy hydrocarbon-containing feedstock downstream of a main fractionation unit (3000), a process in which:
a) the non-elemental mercury contained in the compounds of said feedstock is transformed to elemental mercury, said stage being carried out in a conversion unit (200) at a target temperature during a fixed residence time and adapted to said target temperature so that at least 90% by weight of non-elemental mercury contained in the compounds of said feedstock is converted to elemental mercury, said transformation stage being carried out in the absence of hydrogen and in the absence of a catalyst, it being understood that:
when the target temperature of said feedstock is comprised between 150° C. and 175° C., the residence time of said feedstock in the conversion unit (200) is comprised between 150 and 2700 minutes; and/orwhen the target temperature of said feedstock is greater than 175° C. and less than or equal to 250° C., the residence time of said feedstock in the conversion unit (200) is comprised between 100 and 900 minutes; and/orwhen the target temperature of said feedstock is greater than 250° C. and less than or equal to 400° C., the residence time of said feedstock in the conversion unit (200) is comprised between 5 and 70 minutes; and/orwhen the target temperature of said feedstock is greater than 400° C., the residence time of said feedstock in the conversion unit (200) is comprised between 1 and 10 minutes; b) a fractionation of said hydrocarbon-containing feedstock is carried out in a fractionation unit (3000) in order to produce a top effluent (400) comprising elemental mercury; c) the top effluent (400) obtained in stage b) is brought into contact with a mercury capture material contained in a unit for the capture of mercury (5000), in order to obtain an effluent that is at least partially de-mercurized (420). |
