US 2024/0325945 A1Published application

Method For Combined Hydrocracking of Heavy Petroleum Feedstock, Comprising The Separation of a Spent Additive From Unconverted Hydrocracking Residue and Its Drying

AssigneeTAIF Joint-Stock Company

InventorsAlbert Kashafovich Shigabutdinov, Vladimir Vasilievich Presnyakov, Ruslan Albertovich Shigabutdinov, Rustem Nazyifovich Akhunov, Marat Rinatovich Idrisov, Maksim Anatolievich Novikov, Aleksei Aleksandrovich Khramov, Andrei Aleksandrovich Nizhnekamsk, Artur Semenovich Urazaikin, Viswanathan anand Subramanian

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Abstract

The invention relates to the field of petroleum processing, particularly to a method for processing heavy petroleum feedstock. The method for processing heavy petroleum feedstock comprises the steps of: slurry-phase hydrocracking (SPH) of a feedstock including a heavy petroleum feedstock and a carbon additive, followed by separation into a SPH-subjected feedstock stream and a heavy residue stream, wherein the heavy residue stream is a slurry of an unconverted high-boiling residue and a spent carbon additive; hydrocracking of the feedstock hydrocracking products obtained at the SPH step, in a gas phase with a fixed bed catalyst, followed by fractionation of resulting hydrocracking products; performing a method for purifying an unconverted residue of a heavy petroleum feedstock hydrocracking process from a spent carbon additive to obtain a spent carbon additive and a purified unconverted residue of a heavy petroleum feedstock hydrocracking. The technical effect resides in increasing the efficiency of separation of the spent carbon additive from the mixture of the unconverted residue with the solvent, ensuring stable equipment operation with a specified performance and preventing the clogging of equipment by deposits, thus avoiding long-term equipment downtime and labor-intensive work required to clean deposits from the equipment.

Claims20

Dependent claims

A unit (40) for separating a spent additive from an unconverted residue of heavy petroleum feedstock hydrocracking process, the unit comprising three sections, each including a mixing tank (401, 404, 407), a pump (402, 402-1, 405, 405-1, 408, 408-1), and a separation tank (403, 406, 409), wherein

a mixing tank (401) of a first section is configured to mix a slurry stream, which comprises a carbon additive and the unconverted residue of heavy petroleum feedstock hydrocracking process, with a solvent, a recycle stream from a separation tank (403) of the first section, and a recycle stream from a separation tank (406) of a second section to reduce the viscosity and concentration of the slurry;
a pump (402) is configured to supply a slurry mixture from the mixing tank (401) to a hydrocyclone in the separation tank (403), which is configured to separate the slurry mixture and direct an upper stream from the hydrocyclone partially back to the mixing tank (401) of the first section and partially to a buffer tank (601) of a unit (60) for solvent regeneration and fractionation of purified petroleum products, as well as to direct a lower stream from the hydrocyclone to an internal space of the separation tank (403) and further to a mixing tank (404) of the second section;
the mixing tank (404) of the second section is configured to mix the stream from the separation tank (403) of the first section with a recycle stream from a separation tank (409) of a third section;
a pump (405) of the second section is configured to supply a slurry mixture from the mixing tank (404) of the second section to a hydrocyclone in the separation tank (406) of the second section, which is configured to separate the slurry mixture, recycle an upper stream from the hydrocyclone to the mixing tank (401) of the first section and direct a lower stream from the hydrocyclone into an internal space of the separation tank (406) and further to a mixing tank (407) of the third section;
the mixing tank (407) of the third section is configured to mix the stream from the separation tank (406) of the second section with the solvent;
a pump (408) of the third section is configured to supply a slurry mixture from the mixing tank (407) of the third section to a hydrocyclone in the separation tank (409) of the third section, which is configured to separate the slurry mixture and direct an upper stream from the hydrocyclone into the mixing tank (404) of the second section, as well as to direct a lower stream from the hydrocyclone to an internal space of the separation tank (409) and further to a drum dryer of a spent additive drying unit (50);
wherein the upper stream from each hydrocyclone includes a mixture of the unconverted residue and the solvent, and the lower stream from each hydrocyclone includes a wet spent carbon additive.

4 more elements

A unit (60) for solvent regeneration and fractionation of purified petroleum products, including a buffer tank (601) for storing feedstock to be fed to a vacuum column, a vacuum column pump (602) for feedstock, a hydrocyclone apparatus (603) for additional purification of a stream of spent carbon additive particles, a heater (604), and a vacuum column (605) for separating a solvent and a heavy unconverted residue of heavy petroleum feedstock hydrocracking, wherein

the buffer tank (601) is configured to receive and collect a mixture stream of the unconverted hydrocracking residue and a solvent from a separation tank (403) of a spent additive separation unit and a stream, which is a condensate of hydrocarbon vapors discharged from a drum dryer (501) of a unit (50) for drying a spent carbon additive;
the vacuum column pump (602) for feedstock is configured to supply the feedstock from the buffer tank (601) to the hydrocyclone apparatus (603), which is configured to purify the feedstock and to direct a lower stream including a slurry of the spent carbon additive particles, to a mixing tank (404) and/or to a mixing tank (407) of a unit (40) for separating a spent additive, and to direct an upper stream of the hydrocyclone apparatus (603), including a purified product, for heating to the heater (604) and further to the vacuum column (605);
the vacuum column is configured to produce a regenerated solvent to be directed to the unit (40) for separating the spent additive and bottoms of the vacuum column, which are unconverted residues of heavy petroleum feedstock hydrocracking process purified from the spent carbon additive.

Dependencies are inferred from the claim text.