EP2782982A1 - Dispositif amélioré d'extraction de composés soufrés par extraction liquide liquide au moyen d'une solution de soude avec étape de lavage final optimisée - Google Patents
Dispositif amélioré d'extraction de composés soufrés par extraction liquide liquide au moyen d'une solution de soude avec étape de lavage final optimiséeInfo
- Publication number
- EP2782982A1 EP2782982A1 EP12788617.4A EP12788617A EP2782982A1 EP 2782982 A1 EP2782982 A1 EP 2782982A1 EP 12788617 A EP12788617 A EP 12788617A EP 2782982 A1 EP2782982 A1 EP 2782982A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- extraction
- soda
- column
- sodium hydroxide
- clean
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G21/00—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents
- C10G21/28—Recovery of used solvent
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G19/00—Refining hydrocarbon oils in the absence of hydrogen, by alkaline treatment
- C10G19/02—Refining hydrocarbon oils in the absence of hydrogen, by alkaline treatment with aqueous alkaline solutions
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G21/00—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents
- C10G21/06—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents characterised by the solvent used
- C10G21/08—Inorganic compounds only
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G21/00—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents
- C10G21/30—Controlling or regulating
Definitions
- the invention relates to the field of the extraction of sulfur compounds such as mercaptans, COS and H 2 S from a hydrocarbon fraction. This selective extraction is done by contacting the hydrocarbon feedstock in the liquid phase with a sodium hydroxide solution.
- the disulfide-rich sodium hydroxide solution is brought into contact with a hydrocarbon phase, which makes it possible to extract the disulphides and thus to regenerate the soda solution which can be reused at the top of the liquid-liquid extraction column.
- the parameters associated with the oxidation are chosen so as to oxidize almost all the sodium thiolates present in the sodium hydroxide. The process thus makes it possible to partially or completely desulphurize a hydrocarbon fraction, and generates another organic effluent that is very heavily loaded with sulfur species.
- the soda-countercurrent extraction of the hydrocarbon phase leaving the pretreatment can be carried out in different types of extraction columns. Many technologies are known, such as those reported in the Handbook of Solvent Extraction (Krieger Publishing Company, 1991). These columns are generally designed to generate at least 2 theoretical stages of extraction. A technology of extraction column often encountered is that of perforated trays with spillways, because the countercurrent extraction with soda is often carried out with a flow of soda well. lower than the hydrocarbon flow. The ratio between the flow rates of hydrocarbon and soda can vary between 5 and 40.
- the sodium content in the loop is generally set at a content of between 15 and 25% by weight. A problem inherent in this type of process is that the residual sodium thiolate content in the regenerated sodium hydroxide solution must be very well controlled.
- a minimum sodium thiolate content in sodium hydroxide of between 10 and 60 ppm (weight) is necessary after extraction of the disulfides because the sodium hydroxide also contains a small amount of dissolved oxygen. Indeed the sodium hydroxide solution containing between 0.5 and 20 ppm (weight) of oxygen is returned to the head of the countercurrent extractor, and in the absence of sodium thiolates, the residual oxygen reacts directly in the extractor with the mercaptans present in the hydrocarbon cut and form disulfides in the organic phase that is specifically sought to desulfurize, which is detrimental to the overall performance of the process.
- an excessively high content of sodium thiolates for example greater than 150 ppm by weight, in sodium hydroxide after extraction of the disulphides, limits the performance of the countercurrent extraction.
- the quantity of mercaptans extracted in the extractor is reduced because of the excessive presence of residual sodium thiolates in the sodium hydroxide.
- the maximum permissible content of sodium thiolates in regenerated sodium hydroxide depends both on the permissible sulfur content in the refined hydrocarbon, on the performance or number of theoretical stages of the extraction column, and on the ratio between discharges. of soda and hydrocarbon in the extraction column.
- the principle of the proposed invention consists in using a double-feed sodium extraction column.
- Partially regenerated soda that is to say still containing a significant amount of sodium thiolate, is injected into the column at an intermediate height, while a so-called "clean" soda flow, containing a quantity of thiolates of lower sodium is injected at the top of the column.
- the partially regenerated sodium hydroxide has a quantity of sodium thiolates of between 20 and 600 ppm, expressed as a sulfur weight fraction.
- the sodium hydroxide solution has a quantity of sodium thiolates of between 0 and 50 ppm.
- FIG. 1 shows a version of the device according to the prior art.
- the extraction column (4) uses a single soda circuit, the soda leaving the extraction column (4) in the lower part, and loaded with sodium thiolates being regenerated in an oxidation reactor (9) and then washed in the separation chamber (12) by means of a hydrocarbon cut (10) which is generally gasoline.
- the regenerated soda (6) is reintroduced at the top of the extraction column (4).
- FIG. 2 represents a version of the method according to the invention.
- the extraction column (4) has a lower extraction zone with regenerated sodium hydroxide still partially loaded with sodium thiolates, known as partially regenerated sodium hydroxide, and a top extraction area with fresh clean sodium hydroxide. There are therefore two circuits of soda to ensure the extraction of sulfur products at the extraction column (4).
- Figure 3 shows another version of the method according to the invention.
- the extraction column (4) contains a partially regenerated lower sodium hydroxide extraction zone, and an upper clean sodium extraction zone, the clean sodium hydroxide coming from a second oxidation and extraction section. disulfides, and consisting of a fraction of the partially regenerated soda flow from the first regeneration section.
- the process according to the present invention can be defined as a process for extracting sulfur compounds from a gasoline or LPG hydrocarbon cut by liquid-liquid extraction with a sodium hydroxide solution using a pre-treatment unit (2) of the charge to be treated placed upstream of the extraction unit (4), the soda being introduced into the column (4) in the form of two separate circuits placed either in parallel or in series.
- the first circuit removing the spent soda at the bottom of the column (4) using a first oxidation reactor (9) and a first separation tank (12) of the sodium hydroxide leading to a partially regenerated soda (6), which is reintroduced at an intermediate point of the extraction column (4) so as to separate said column into a upper compartment located between said intermediate reintroduction point and the upper end of the column (4), and a lower compartment located between said intermediate reintroduction point and the withdrawal point of the spent soda (7) located at the bottom of the column extraction (4),
- the second circuit being a clean soda circuit (16) introduced into the upper compartment of the column, a clean soda withdrawal (17) being carried out from the upper compartment, which is then returned to the feed pipe of the soda (16) and the ratio R2 between the flow (17) of clean soda taken from the upper compartment of the extraction column (4) and the flow of clean soda (16) reintroduced into the upper part of the column is between 1 and 10 and preferably between 1 and 5.
- the first circuit withdraws the used soda at the bottom of the column (4) and uses a first oxidation reactor (9) and a first separating flask (12) of the sodium hydroxide leading to a partially regenerated soda (6) , a part (24) of the partially regenerated soda (6) being sent into the second regeneration circuit, and the other part of the partially regenerated soda stream (6 ') being reintroduced at an intermediate point of the extraction column (4) to separate said column into an upper compartment located between said intermediate reintroduction point and the upper end of the column (4), and a lower compartment located between said intermediate reintroduction point and the withdrawal point of the spent soda (7) at the bottom of the extraction column (4),
- the second regeneration circuit relates to the partially regenerated soda stream (24) and uses a second oxidation reactor (25), a second separation tank (18), and a third separation tank (19), leading to to a clean soda, the flow of clean soda (16) being reintroduced by the upper point of the extraction column (4).
- the process for extracting sulfur compounds from a gasoline or LPG type hydrocarbon fraction thus uses the R1 ratio between the partially regenerated sodium flux (24) entering the second oxidation reactor (25) as operating variable. ) and the partially regenerated soda flow (6) leaving the first separator flask (12), this ratio R1 being between 0.01 and 0.25 and preferably between 0.05 and 0.15.
- the process for extracting sulfur compounds from a gasoline or LPG type hydrocarbon fraction uses, as another operating variable, a second ratio R 2 between the flow rate (17) of clean sodium hydroxide taken from the upper part of the column.
- the reintroduction point of the partially regenerated soda flow ( 6 ') in the extraction column (4) divides said column into two compartments, the upper compartment of the extraction column (4) behaves as a single theoretical extraction stage and the lower compartment of the column (4). ) behaves as a set of N theoretical stages in series, N being between 1 and 4.
- the present invention relates to a process for extracting sulfur compounds present in a hydrocarbon fraction, in the case where the majority sulfur species are mercaptans, denoted RSH, for example methanethiol CH 3 SH, ethanethiol C 2 H 5 SH, propanethiol C 3 H 7 SH, and or other sulfur species are also present, such as H 2 S hydrogen sulfide or COS carbon oxysulfide.
- RSH mercaptans
- Figure 1 illustrates the process used to extract the sulfur species according to the prior art.
- the hydrocarbon fraction 1 enters a pretreatment chamber 2 pre-filled with a dilute sodium hydroxide solution at a concentration of between 2 and 10% by weight.
- the sodium hydroxide solution in the pretreatment chamber 2 is renewed according to an operating cycle of between 3 and 30 days, depending on the age of the soda.
- Pretreatment extracts a variable amount of sulfur species, including mercaptans.
- the hydrocarbon feedstock (3) then enters a countercurrent extraction column (4) from the bottom of said column.
- the extraction column (4) is also fed with a regenerated sodium hydroxide solution (6) at the top of the column.
- the concentration of sodium hydroxide is then between 15% and 25% by weight.
- the extraction column (4) serves to extract the majority of the mercaptans still present in the hydrocarbon feedstock.
- the hydrocarbon feed thus refined leaves the column (4) via the pipe (5).
- the sodium hydroxide leaving the column (4) via line (7) is loaded with RS-Na sodium thiolate species corresponding to the mercaptans extracted, dissociated and recombined with Na + sodium ions.
- the flow (7) enters an oxidation reactor (9), also supplied with air by the pipe (8).
- the presence of air and a catalyst dissolved in the sodium hydroxide solution promote the oxidation reaction of sodium thiolates to disulphides noted RSSR.
- the catalyst used may be of the family of cobalt phthalocyanines.
- the multiphase medium leaving the oxidation reactor (9) via the pipe (11) is sent to a separation tank (12).
- a flow (10) of petrol cut or other hydrocarbon is injected into the sodium hydroxide solution upstream of the separation tank (12), for example in line (11).
- a separation flask (not shown in Figure 1) is added on the line (6) to optimize the extraction of disulfides with the hydrocarbon cut.
- the hydrocarbon cut (10) used to extract the disulfides is injected into the line (6), and then decanted into the additional separation flask.
- FIG. 2 illustrates a first version of the method according to the invention.
- the regenerated sodium hydroxide (6) is injected at a certain intermediate height of the extraction column (4).
- This point of introduction of the partially regenerated sodium hydroxide delimits two compartments of the extraction column (4), an upper compartment located between said point of introduction and the top of the column and a lower compartment between said point of introduction. and the bottom of the column.
- the upper cup is used to carry out extraction with new soda (16), not containing sodium thiolates.
- the treated hydrocarbon still leaves the extraction column (4) via the head pipe (5).
- the extraction column (4) can be equipped with an internal device (15) limiting the rearmixing of the phases between the two upper and lower compartments.
- the upper compartment operates as a single theoretical stage
- the clean soda (16) can be recycled in the upper compartment of the column (4) so as to increase the flow rate of the soda and consequently the exchange surface between phases. This is achieved by the withdrawal of soda (17) from the upper compartment, which is then returned to the supply line of the clean soda (16).
- a purge of soda (26) is necessary on the clean soda loop to maintain the amount of sodium hydroxide constant. It can be performed for example on the pipe leaving the extraction column foot (4).
- FIG. 3 illustrates the preferred version of the method according to the invention.
- the extraction column (4) is also compartmentalized into an upper compartment located above the point of introduction of the partially regenerated soda (6 '), and a lower compartment located below the reintroduction point of the partially regenerated soda ( 6 ').
- the mercaptans are extracted with a partially regenerated soda in the lower part of the column (4), and with a clean soda (17) in the upper part of the column (4).
- the variant of the method according to FIG. 3 presents a more elaborate regenerated soda treatment scheme than in the variant corresponding to FIG. 2, and leads to creating the flow of clean soda (16) from a portion (24). partially regenerated soda stream (6).
- the disulfide-loaded soda (11) leaving the oxidation reactor (9) is sent to a separation tank (12).
- the depleted air exits the separation tank (12) through the line (14).
- the disulfide-loaded hydrocarbon phase exits the flask via line (13).
- the partially regenerated soda (6) leaving the separation tank (12) is divided into two streams: the flow (6 ') injected at an intermediate height of the extraction column (4), and
- the flow rate of the flow (24) represents from 1% to 25% by weight of the partially regenerated flow rate of sodium hydroxide (6). Preferably this flow (24) represents from 5% to 15% of the flow (6).
- the second oxidation reactor (25) is used to disulfide the residual sodium thiolates present in the stream (24). For this, an air flow (23) is sent to the bottom of the second oxidation reactor (25).
- the multiphase mixture exiting the second oxidation reactor (25) is then separated in one or two separation flasks (18) and (19).
- a first separation tank or decanter (18) is used to separate the mixture from the depleted air (21), then a second separation tank or decanter (19) is used to separate the clean soda (16) of the disulfide-containing hydrocarbon (20).
- the hydrocarbon used to extract the disulphides from the sodium hydroxide is introduced via the pipe (10) upstream of the second oxidation reactor (25).
- a new soda (22) can be injected at the top of the extraction column (4).
- a certain flow rate of spent soda necessary to ensure the material balance is purged from the loop by the pipe (26).
- the technology of the extraction column (4) is chosen so as to maximize the contact areas between phases in its upper compartment.
- the flow (17) feeding the clean soda loop is withdrawn in a zone essentially occupied by the sodium phase, so as not to cause a large amount of hydrocarbon.
- the recycle flow of soda Q17 in the upper part of the column (4) is set at 10 times the flow rate Q16 entering through the pipe (16).
- the upper compartment of the extraction column (4) behaves as a single theoretical extraction stage, while the lower compartment of the column (4) behaves like 1 to 4 theoretical extraction stages, preferably of 1 to 2 theoretical stages.
- An extraction unit of the mercaptans present in a hydrocarbon phase of LPG type, a mixture of alkanes and alkenes with 2, 3 and 4 carbon atoms is considered.
- the process is similar in all respects to that described by Figure 3.
- the pretreatment consists of a prewash tank 2 of 10 m 3 2/3 filled with a sodium hydroxide solution of 6% by weight, repeated every 10 days.
- the hydrocarbon feedstock to be treated (1) has a flow rate of 15 m3 / h, contains 115 ppm of methyl mercaptans, 10 ppm of COS and 10 ppm of H 2 S.
- the flow rate Q7 of soda extractor foot 4 is 1m3 / h, and its sodium content is 18% by weight.
- the process operates at 7 bar absolute.
- the driving parameter is:
- Cases 1 to 3 for which the flow rate Q24 is zero are the cases according to the prior art (cf. FIG. 1).
- Cases 4 to 7 for which the flow rate Q24 is not zero, are the cases according to the present invention.
- the sizing of the second oxidation reactor (25) is such that the sodium hydroxide leaving it no longer contains sodium thiolates and is saturated with dissolved oxygen.
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Extraction Or Liquid Replacement (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1103594A FR2983206B1 (fr) | 2011-11-24 | 2011-11-24 | Procede ameliore d'extraction de composes soufres par extraction liquide liquide au moyen d'une solution de soude avec etape de lavage final optimise |
| PCT/FR2012/000419 WO2013076384A1 (fr) | 2011-11-24 | 2012-10-16 | Dispositif amélioré d'extraction de composés soufrés par extraction liquide liquide au moyen d'une solution de soude avec étape de lavage final optimisée |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2782982A1 true EP2782982A1 (fr) | 2014-10-01 |
Family
ID=47216353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12788617.4A Ceased EP2782982A1 (fr) | 2011-11-24 | 2012-10-16 | Dispositif amélioré d'extraction de composés soufrés par extraction liquide liquide au moyen d'une solution de soude avec étape de lavage final optimisée |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9512367B2 (fr) |
| EP (1) | EP2782982A1 (fr) |
| FR (1) | FR2983206B1 (fr) |
| RU (1) | RU2605441C2 (fr) |
| WO (1) | WO2013076384A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3063497B1 (fr) * | 2017-03-01 | 2019-04-05 | Axens | Procede ameliore de regeneration d'une solution alcaline utilisee dans un procede d'extraction de composes soufres comportant une etape de lavage |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2431770A (en) * | 1943-12-31 | 1947-12-02 | Standard Oil Co | Sweetening process |
| GB601978A (en) * | 1944-04-15 | 1948-05-18 | Shell Dev | Process for the regeneration of caustic alkali solutions containing mercaptans |
| US3474027A (en) * | 1967-06-19 | 1969-10-21 | Phillips Petroleum Co | Plural stages of sulfur removal |
| US4039389A (en) | 1975-11-03 | 1977-08-02 | Uop Inc. | Liquid-liquid extraction apparatus |
| US4626341A (en) * | 1985-12-23 | 1986-12-02 | Uop Inc. | Process for mercaptan extraction from olefinic hydrocarbons |
| US6749741B1 (en) | 2001-12-20 | 2004-06-15 | Uop Llc | Apparatus and process for prewashing a hydrocarbon stream containing hydrogen sulfide |
-
2011
- 2011-11-24 FR FR1103594A patent/FR2983206B1/fr active Active
-
2012
- 2012-10-16 EP EP12788617.4A patent/EP2782982A1/fr not_active Ceased
- 2012-10-16 WO PCT/FR2012/000419 patent/WO2013076384A1/fr not_active Ceased
- 2012-10-16 US US14/360,385 patent/US9512367B2/en active Active
- 2012-10-16 RU RU2014125427/04A patent/RU2605441C2/ru active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013076384A1 (fr) | 2013-05-30 |
| FR2983206B1 (fr) | 2015-03-20 |
| RU2014125427A (ru) | 2015-12-27 |
| RU2605441C2 (ru) | 2016-12-20 |
| US20140284250A1 (en) | 2014-09-25 |
| US9512367B2 (en) | 2016-12-06 |
| FR2983206A1 (fr) | 2013-05-31 |
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