RU-2023132114-A - Hydroprocessing with increased purity of recirculated gas

Inventors

• СТЬЮПИН, Стивен В.
• Андерсен, Штефан
• ТАККЕР, Приеш

Assignees

• ТОПСЁЭ А/С

Dates

Publication Date

20260508

Application Date

20220506

Priority Date

20210708

Claims (20)

1. 1. A method for converting a feedstock enriched in oxygen-containing compounds into a stream of liquid hydrocarbon products, comprising the steps
2. a. directing said feedstock in combination with a recycle gas stream to a hydroprocessing step to produce a two-phase hydroprocessed process stream containing at least hydrogen, methane and hydrocarbons,
3. b. combining a methane-depleted hydrocarbon stream that is liquid at ambient temperature and pressure with a methane donor stream that is either (i) said two-phase hydroprocessed process stream or (ii) a gaseous hydroprocessed stream obtained from said two-phase hydroprocessed process stream by phase separation, and optionally cooling, to produce a multi-phase combined stream,
4. c. separating said multiphase combined stream into at least a hydrogen-rich gas stream containing a majority of the hydrogen contained in said hydrotreated process stream and a rich liquid hydrocarbon stream containing absorbed methane,
5. d. desorbing in a desorbing step some amount of methane from said enriched liquid hydrocarbon stream, such as by a flash evaporation process or a stripping process, to transfer some amount of methane into a gas phase, in order to provide a methane-enriched gaseous stream and to provide a liquid hydrocarbon product stream.
6. 2. The method of claim 1, wherein said methane-depleted hydrocarbon stream is combined with a two-phase hydroprocessed process stream to produce said multiphase combined stream, followed by cooling and separating the phases of the combined stream to produce said hydrogen-enriched gas stream and said enriched liquid hydrocarbon stream.
7. 3. The method of claim 1, wherein the two-phase hydroprocessed process stream is cooled and phase separated in a flash evaporation step to produce a gas stream and a liquid stream, and wherein the methane-depleted hydrocarbon stream is combined in a combining step with the gas stream to produce said multi-phase combined stream.
8. 4. The method of claim 3, wherein the flash evaporation step and the combining step are carried out in an integrated absorption zone and a flash evaporation zone, so that the methane-depleted hydrocarbon stream is combined with the two-phase hydrotreated hydrocarbon stream to produce said enriched liquid hydrocarbon stream containing methane.
9. 5. The method according to claim 3, wherein the flash evaporation step and the combining step are carried out in separate devices for flash separation and absorption.
10. 6. The method of claim 1, wherein separating said two-phase hydrotreated process stream is carried out after optional cooling by directing the two-phase hydrotreated process stream into a high-pressure stripping column receiving a stripping medium and producing a stripped liquid stream and a stripping column overhead stream.
11. 7. The method of claim 6, wherein said stripper overhead stream is a hydroprocessed gaseous stream that is combined with a methane-depleted hydrocarbon stream before being sent to a first separator to provide at least said methane-rich liquid hydrocarbon stream and said hydrogen-rich gaseous stream, and wherein said methane-rich liquid stream is sent to a further separator to provide said desorption step to produce a methane-depleted liquid stream and a methane-rich gaseous stream.
12. 8. The method of claim 1, wherein the pressure of the multiphase combined flow is at least 3000 kPa.
13. 9. The method according to claim 1, wherein the temperature of the multiphase combined stream is from 20°C to 275°C, for example from 20°C to 90°C or 150°C or from 150°C or 200°C to 275°C.
14. 10. The method of claim 1, wherein the desorption step comprises reducing the pressure to a level of less than 2000 kPa.
15. 11. The method of claim 1, wherein the desorption step comprises stripping the methane-rich liquid hydrocarbon stream using a stripping medium such as hydrogen or water vapor.
16. 12. The method of claim 1, wherein the desorption step comprises reducing the pressure by 80% of the pressure before desorption.
17. 13. The method of claim 1, wherein the liquid hydrocarbon product stream comprises at least some amount of a liquid stream with a reduced methane content or a product of further hydroprocessing of a liquid stream with a reduced methane content.
18. 14. The method according to one of claims 1-13, wherein the liquid hydrocarbon stream includes at least some amount of a liquid stream that has been hydrotreated or a product of further hydrotreating a liquid stream that has been hydrotreated.
19. 15. Technological installation, including
20. a hydroprocessing section having an inlet for the liquid phase, an inlet for the gas phase and an outlet,