FIELD: oil and gas industry.
SUBSTANCE: invention is referred to hydrotreating method for heavy hydrocarbons containing asphaltenes, deposits, admixtures including sulphur, nitrogen and metals, wherein hydrocarbon material and hydrogen are passed in hydrotreating conditions through hydrotreating catalyst in at least two protective hydrotreating zones with fixed layers, each of them containing at least one catalytic layer, at that the protective areas are placed in sequence with their potential cyclic use. At that the cycle consists in sequential repletion of stages b), c) and c'), whereat: a) raw material is passed through all protective zones during time period being a part of deactivation time and/or clogging time for the first protective zone being in contact with the raw material; a') part of raw material is still passed through the first protective zone being in contact with raw material, while the other part of raw material is introduced into the closest downstream protective zone within the time period less than deactivation time and/or clogging time for the first protective zone being in contact with the raw material; b) deactivated and/or clogged protective zone is short-circuited and catalyst contained by it is regenerated and/or replaced by fresh catalyst used for other (others) protective zones; c) raw material is passed through all protective zones, at that the protective zone wherein catalyst has been regenerated at the previous stage, is connected again so that its is located downstream, behind all other protective zones, and the wove stage will continue during the whole time period being a part of deactivation time and/or clogging time for the first protective zone being in contact with the raw material; c') one part of raw material is still passed through the first protective zone being in contact with raw material, the other part of raw material is introduced into the closest downstream protective zone within the time period less than deactivation time and/or clogging time for the first protective zone being in contact with the raw material.
EFFECT: method allows increase in duration of the operation cycle for protective zones, improvement in operational factors for the plant, reduction in operational costs and consumption of fresh catalyst.
13 cl, 3 dwg, 3 tbl, 2 ex
