Key information

Title
System and method for removal of oxygen from water
Application number
20190797
Case type
National
Status
01.02.2021 Patent meddelt (B1)
Filed
25.06.2019
Effective date
25.06.2019
Publicly available
28.12.2020
Next annual fee due
30.06.2027
Applicant
Minox Technology AS (NO)
Owner
Minox Technology AS (NO)
Inventor
Ingvild Lindheim Sisjord (NO) et al.
Agent
ACAPO ONSAGERS AS (NO)
Granted
01.02.2021
Patent number
345441
Expiry date
25.06.2039

Abstract and drawing


Disclaimer: This text has been machine-scanned and may contain errors – please refer to "Publications" for legally binding content.
A system for removal of oxygen from water. The system comprises a membrane extractor (3) and a deoxidizer (12). The membrane extractor (3) has an inlet for oxygen rich water (1) an and inlet for nitrogen. The extractor (3) brings water and nitrogen into contact with opposite sides of a membrane (3a), causing oxygen to migrate from the water to the nitrogen through the membrane (3a). The deoxidizer (12) receives a mixture of oxygen and nitrogen and fuel and removes oxygen from said nitrogen through a catalytic process. The deoxidizer (12) has an outlet for purified nitrogen (16). The outlet (16) is coupled to the nitrogen inlet of said membrane extractor (3). A bypass line (17) extends from said nitrogen outlet of said deoxidizer (12) to downstream of said membrane extractor (3).

Publications


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Date Doc. No. Process Case number In/Out Journal description To/from
05.02.2025 02-01 Endring av fullmektig 2025/01743 UT GH Forespørsel ACAPO ONSAGERS AS
04.02.2025 01-02 Endring av fullmektig 2025/01743 INN GPOA Norway ACAPO ONSAGERS AS
04.02.2025 01-01 Endring av fullmektig 2025/01743 INN Generell henvendelse ACAPO ONSAGERS AS
04.05.2021 14-01 Saksbehandling 20190797(345441) UT PT Varsel om betaling av første årsavgift (3317) (PT20190797)
04.02.2021 13-01 Saksbehandling 20190797(345441) UT PT Registreringsbrev Nasjonal Patent (15) (PT20190797)
28.10.2020 12-01 Saksbehandling 20190797 UT Intention to grant PROTECTOR IP AS
23.10.2020 11-05 Saksbehandling 20190797 INN Patentkrav (NO) PROTECTOR IP AS
23.10.2020 11-04 Saksbehandling 20190797 INN P5835NO00-Styrebrev PROTECTOR IP AS
23.10.2020 11-03 Saksbehandling 20190797 INN Description 487565 PROTECTOR IP AS
23.10.2020 11-02 Saksbehandling 20190797 INN Description (marked-up) PROTECTOR IP AS
23.10.2020 11-01 Saksbehandling 20190797 INN Korrespondanse (Hovedbrev inn) PROTECTOR IP AS
01.10.2020 10-01 Saksbehandling 20190797 UT Substantive examination PROTECTOR IP AS
18.08.2020 09-05 Saksbehandling 20190797 INN Krav NO PROTECTOR IP AS
18.08.2020 09-04 Saksbehandling 20190797 INN Krav med sporing PROTECTOR IP AS
18.08.2020 09-03 Saksbehandling 20190797 INN Krav PROTECTOR IP AS
18.08.2020 09-02 Saksbehandling 20190797 INN Hovedbrev PROTECTOR IP AS
18.08.2020 09-01 Saksbehandling 20190797 INN Korrespondanse (Hovedbrev inn) PROTECTOR IP AS
03.07.2020 08-02 Saksbehandling 20190797 INN Hovedbrev PROTECTOR IP AS
03.07.2020 08-01 Saksbehandling 20190797 INN Korrespondanse (Hovedbrev inn) PROTECTOR IP AS
02.07.2020 07-01 Saksbehandling 20190797 UT Brev prioritetsdokument PROTECTOR IP AS
19.06.2020 06-02 Saksbehandling 20190797 INN Skjema bestilling av pri.dok. PROTECTOR IP AS
19.06.2020 06-01 Saksbehandling 20190797 INN Korrespondanse (Hovedbrev inn) PROTECTOR IP AS
03.04.2020 05-01 Saksbehandling 20190797 UT Realitet patent PROTECTOR IP AS
17.02.2020 04-04 Saksbehandling 20190797 INN Beskrivelse merket PROTECTOR IP AS
17.02.2020 04-03 Saksbehandling 20190797 INN Hovedbrev PROTECTOR IP AS
17.02.2020 04-02 Saksbehandling 20190797 INN Beskrivelse ren PROTECTOR IP AS
17.02.2020 04-01 Saksbehandling 20190797 INN Korrespondanse (Hovedbrev inn) PROTECTOR IP AS
08.01.2020 03-02 Saksbehandling 20190797 UT PT_report 12:15:34
08.01.2020 03-01 Saksbehandling 20190797 UT Realitet patent PROTECTOR IP AS
03.07.2019 02-01 Saksbehandling 20190797 UT Infobrev til oppfinner PROTECTOR IP AS
25.06.2019 01-07 Saksbehandling 20190797 INN Erklæring Søkers rett til oppfinnelse PROTECTOR IP AS
25.06.2019 01-06 Saksbehandling 20190797 INN Beskrivelse PROTECTOR IP AS
25.06.2019 01-05 Saksbehandling 20190797 INN Krav PROTECTOR IP AS
25.06.2019 01-04 Saksbehandling 20190797 INN Fullmakt PROTECTOR IP AS
25.06.2019 01-03 Saksbehandling 20190797 INN Sammendrag PROTECTOR IP AS
25.06.2019 01-02 Saksbehandling 20190797 INN Patenttegninger PROTECTOR IP AS
25.06.2019 01-01 Saksbehandling 20190797 INN Søknadsskjema Patent PROTECTOR IP AS

Description, claims and drawings


Disclaimer: This text has been machine-scanned and may contain errors – please refer to "Publications" for legally binding content. Description
System and method for removal of oxygen from waterTechnical FieldThe present invention relates to a system and method for removal of oxygen from water, in particular for deoxidizing seawater to be injected under high pressure into an oil and/or gas reservoir for enhanced oil and/or gas recovery.Background ArtRemoval of oxygen from seawater has been an important issue for decades. Examples of such systems and methods are known from inter alia the following references:WO 2012/065243 describes a process and apparatus for reduction of dissolved oxygen in seawater by using a separator in horizontal alignment to provide high gas-liquid contacting area for separation and de-entrainment within the separator, and thereby provide a higher output. The first bed typically comprises multiple layers of high efficiency structures packing or random packing with high surface area per unit packing volume. The second bed preferably comprises a high void fraction structured packing or grid with lower surface area per unit packing volume. The seawater is heated to 30 – 60 °C to enhance removal of oxygen from the seawater and fuel gas is used as stripping gas. The stripping gas and entrained oxygen is combusted for heating the seawater. The stripping gas is used once in order to avoid operating problems arising from fouling of downstream equipment due to entrained salt.US 5.006.133 describe a method and apparatus in which a fuel including natural gas is used as both a stripping gas to remove oxygen from seawater and a fuel to be oxidized by said stripped oxygen in a catalytic process.US 4.612.021 describe a process for reduction of unwanted gas in a liquid by contacting with another gas. The second gas serves as a stripping gas, for example for reduction of oxygen in seawater by supplying nitrogen as said seawater is injected into a main gas ejector. In an auxiliary gas injector, positioned above the main gas injector, dissolution of entrained nitrogen displaces the oxygen dissolved in the seawater, which is then reacted in a catalytic burner. Make up nitrogen is then provided.US 4.752.306 describes a system in which an inert gas stripping gas is mixed in turbulent co-current flow with seawater to remove dissolved oxygen. The resulting gas mixture and liquid are separated, the gas mixture is then treated to remove oxygen, and the stripping gas is then returned to treat more seawater. A distinguishing feature of this process is that nitrogen is purified after use by removal of oxygen in a separate catalytic reaction chamber before recycling through the process.NO158283 with the same applicant as present invention relates to a deoxygenation system comprising two gravitational separators and a catalytic reactor for reducing the oxygen content of seawater. The apparatus is compact and can be used at hazardous and non-hazardous locations through use of suitable enclosures. This system comprises a series of stages. Methanol is added to the effluent of the first stage stripping gas stream and the mixture of gases is heated over a catalyst so that the methanol reacts with oxygen to form carbon dioxide and water. The deoxygenated stripping gas is then returned to a second stage for further use. A problem that can occur with the recycle system of this type is that the catalyst and other equipment in the gas loop are prone to fouling from entrained saltwater.US 20150283481 describes a type of inline separator where a fluid is passed through a tube element and the fluid is separated into light and heavy fluids. The heavier fluids are discharged to a vessel. A connection tube is coupled between the upper part of the vessel and the tube element to return the lighter fluid. The purpose of the inline separator is to remove e.g. water or separate the different constituents in a hydrocarbon mixture before further transport. This publication fails to describe use of in-line separators for separating stripping gas from seawater for subsequent injection of oxygen-depleted seawater into and oil or gas well.NO340761 describes a method and apparatus for removal of oxygen from seawater. The stripping gas is continuously circulated, and the oxygen is removed by oxidation of a fuel that is added into the stripping gas circuit. Salt amount in seawater entrained with the stripping gas circuit is diluted by injection of fresh water.NO20130670, US4.937.004, GB 2202167, GB 2127711, EP 458737, EP 391839, EP 327491, US 4.612.021 and US 4.5656.34 relates similar methods and apparatus, but fail to describe use of inline separators in seawater deoxygenation systems, and injection of fresh water into the stripping gas to dilute amount of salt in the entrained seawater, to reduce salt deposits in the gas loop.WO 2006/086046 A2 discloses a process where catalytic combustion is used to regenerate the second reactant (nitrogen) which has been used in a process where oxygen has been removed from an oxygen containing liquid.US 2010/230366 A1 and US 2016/096745 A1 describe use of membrane extractors for deoxygenation of seawater.Membranes are known generally in the art for extracting or separating gasses. In a standard membrane system, a Pressure Swing Adsorber (PSA) N2 generator would be used. This is a fairly complex system comprising a large air compressor, a large air tank, two Pressure Swing Adsorber (PSA) vessels and an N2 holding tank. To produce lean N2 from air in a PSA system is needed transportation and storage of a large amount of air. This results in a large air compressor and air reservoir with corresponding large footprint and energy consumption. Experience shows that a PSA system is not very stable and has problems producing N2 with the required purity >99.99%. A PSA system has no regeneration of N2. The vacuum pump discharges the N2 to the atmosphere.Summary of inventionThe present invention has as its primary object to facilitate the use of a membrane extractor, also called deaerator, and optimize the nitrogen regeneration process. According to the process of the invention an N2 regeneration loop is provided that regenerates the discharged O2 rich N2 in a catalytic process. A reaction is created when a fuel, mixed with the N2 upstream of the deoxidizer vessel, reacts with the O2 over a catalyst bed inside the deoxidizer vessel. This process removes the O2 from the N2.From the deoxidizer vessel N2 with a purity that can be in excess of 99.99% exits at a somewhat elevated temperature.It has however been found that the membrane extractor is so efficient that the N2 exiting the membrane extractor has a very high O2 content. As this O2 enriched gas is fed through the deoxidizer vessel, the result is a very high temperature in the catalytic process inside the deoxidizer vessel. The high temperature is challenging with regards to materials in vessels, valves and piping/tubing.To address this issue the present invention introduces a circulation loop in the N2 regeneration process. An excess of N2 will be circulated in the regeneration loop. A portion of the N2 will be routed to the deaerator membranes, the rest of the N2 will be routed to the vacuum discharge line from the membrane extractor. The high O2 in N2 gas is mixed with virtually pure N2 and hence the O2 content is diluted, resulting in a lower process temperature in the deoxidizer.It is preferred to use hydrogen as fuel in the deoxidizer. In that case, the only product of the reaction, apart from lean N2, is water. In addition, the hydrogen would further reduce the temperature in the reaction, making hydrogen a preferred fuel for this process.However, it is also possible to use other types of fuel. In the event of using carbon containing fuels, such as methanol, ethanol or methane, a small amount of CO2 will be produced. Unlike common prior art deoxygenation units, in a membrane deaerator there is no direct contact between gas and water. This means that the CO2 produced by the catalytic process will not escape the gas with the water. This means a build-up of CO2 will occur in the gas loop. To remedy this, the CO2 content has to be monitored and some of the gas needs to be discharged and replaced with top up gas whenever the CO2 exceeds a predetermined limit.These and other advantages are obtained by a system for removal of oxygen from water, comprising: - a membrane extractor, said membrane extractor having an inlet for oxygen rich water an and inlet for nitrogen; said membrane extractor bringing water and nitrogen into contact with opposite sides of a membrane, causing oxygen to migrate from the water to the nitrogen through the membrane; said membrane extractor having an outlet for oxygen depleted water and an outlet for oxygen and nitrogen mixture;- a deoxidizer receiving said mixture of oxygen and nitrogen and fuel; said deoxidizer removing oxygen from said nitrogen through a catalytic process; said deoxidizer having an outlet for purified nitrogen, said outlet being coupled to the nitrogen inlet of said membrane extractor;wherein a bypass line extends from said nitrogen outlet of said deoxidizer to a line downstream of a vacuum pump, wherein an adjustable valve is provided in the line to adjust the flow ration of nitrogen between the membrane extractor and the bypass line.The bypass line is preferably coupled to the downstream end of a vacuum pump that is coupled downstream of the membrane extractor.Present invention also relates to a method of removal of oxygen from water, comprising the following steps:- bringing oxygen rich water and nitrogen into contact with opposite sides of a membrane in a membrane extractor, causing oxygen to migrate from the oxygen rich water to the nitrogen through the membrane, forming a mixed flow of nitrogen and oxygen,- removing oxygen from the mixed flow of nitrogen and oxygen exiting from the membrane extractor in a deoxidizer through a catalytic process, wherein the flow of deoxidized nitrogen is split into two flows, a first flow that is fed into the membrane extractor and a second flow that is bypassed the membrane extractor and mixed with said mixed flow of oxygen and nitrogen downstream of the membrane extractor.Preferably, the ratio between said first flow and said second flow is adjusted in response to the temperature of the deoxidizer removing oxygen from the mixed low.Brief description of drawingsThe invention will now be explained in further detail, referring to the exemplary embodiment of the enclosed single figure:Figure 1 shows schematically a system according to an embodiment of the invention.Detailed description of the inventionAn embodiment of the invention will now be described referring to figure 1.Seawater enters the system at 1. The seawater flows through a heat exchanger 2 where it acts as a coolant for N2 gas exiting from a deoxidizer 12. Between the heat exchanger 2 and the membrane extractor 3 is a dewatering unit 19 that removes water, produced in the deoxidizer and condensed in the heat exchanger, from the N2 gas. The extracted water may be handled in a separate process (not shown) and drained to sea either directly or via a purifying process where contaminates are removed, or alternatively be injected into the deoxidised water downstream the deaeration membrane and hence be injected into the oil and/or gas reservoir.The seawater and the N2 enters opposite sides of a membrane 3a of a membrane extractor 3. The membrane extractor 3 will actually have several membranes and the membranes are not flat objects but may for example comprise a plurality of narrow tubes to take up less space and increase the exposed area against the media (water and N2). The illustrated extractor is merely showing a simplified principle and the actual design of the membrane extractor 3 will be a choice based on technology known to the person of skill. In the membrane extractor 3 the oxygen dissolved in the water will escape through the membrane 3a due to osmotic pressure and mix with the N2. This is a well-known process per se and hence does not need any further explanation. The seawater that has been depleted from oxygen flows out of the membrane extractor 3 at 4 for further use, such as injection into an oil or gas reservoir. The O2 enriched N2 is sucked out from the membrane extractor 3 through a vacuum line 5 by a vacuum pump 6. From the pump 6 the N2/O2 mixture flows through a vacuum discharge line 7 and a line 8 to a compressor 9, where the N2/O2 mixture is compressed to an elevated pressure. The pressurized N2/O2 mixture is preheated by a heater 10 and fed to the deoxidizer vessel 12. Fuel, such as hydrogen, methanol, ethanol or methane is added to the N2/O2 mixture through a line 11 before the mixture of N2, O2 and fuel enters the deoxidizer vessel 12.In the deoxidizer vessel 12 is a catalyst bed 13 of a type that is well known per se to the skilled person in the art. In this bed 13 the O2 reacts with the fuel to produce mainly water vapour and, depending on the fuel, small amounts of CO2. In the event of CO2 build up in the gas loop, the CO2 enriched gas is expelled from the process as exhaust through a line 15. The CO2 enriched gas may be removed in a separate process (not shown), or alternatively be injected into the deoxidised water downstream the deaeration membrane and hence be injected into the oil and/or gas reservoir.The now virtually pure N2 exits the deoxidizer at 16 and flows through the heat exchanger 2 back again to the membrane extractor. The hot nitrogen exiting the deoxidiser can alternatively be routed through an additional loop to the preheater 10 for preheating the N2/O2 upstream the deoxidizer. The pre-heater 10 would in this event be a heat exchanger.If the process had been run as described above, the temperature in the deoxidizer vessel 12 would have increased to an inconveniently high level due to the high proportion of O2 in the N2/O2 mixture. The high proportion of O2 is due to the high efficiency of the membrane extractor, as in a membrane deaerator a large amount of O2 is extracted from the water using a relatively low amount of N2. As explained above, this results in a very high O2 content of the N2 exiting the membrane deaerator. This high O2 in N2 content results in a very high temperature in catalytic process inside the deoxidizer. The high temperature is challenging with regards to materials in vessels, valves and piping/tubing.To avoid such high temperatures, a bypass loop 17 of N2 has been included, which bypasses some of the virtually pure N2 exiting from the deoxidizer vessel 12 to the line 7 downstream of the vacuum pump 6. An adjustable valve 18 is provided to adjust the ratio between N2 fed to the membrane extractor 3 and bypassed through the bypass line 17.When the N2/O2 mixture is mixed with pure N2 the oxygen concentration in the mixture is substantially reduced. This results in a reduced working temperature of the deoxidizer vessel. Hence the lifespan of the catalyst bed, vessel, valves and other components can be extended. It also results in an overall cooler process in the system.The system may conveniently comprise one or more temperature sensors that detect the temperature in the deoxidizer and/or the temperature of the nitrogen at the outlet of the deoxidizer and adjusts the split of flows between the membrane extractor and the bypass. If the temperature is above certain level, the flow of nitrogen in the bypass is increased. If the temperature drops below another level, the flow is decreased.As there inevitably will be some build-up of CO2 in the N2 over time, it may be necessary to exchange the nitrogen for fresh nitrogen or air. Supply of nitrogen or air may conveniently be done upstream of the compressor 9, as shown by the line 14. If air is used to replenish nitrogen to the process, a gas analyser will be arranged downstream of the pre-heater 10 to measure the O2 concentration so that the right amount of fuel can be injected to obtain a complete combustion of O2.
Claims
Claims1. A system for removal of oxygen from water, comprising:- a membrane extractor (3), said membrane extractor having an inlet for oxygen rich water an and inlet for nitrogen; said membrane extractor (3) bringing water and nitrogen into contact with opposite sides of a membrane (3a), causing oxygen to migrate from the water to the nitrogen through the membrane (3a); said membrane extractor (3) having an outlet (4) for oxygen depleted water and an outlet (5) for oxygen and nitrogen mixture;- a deoxidizer (12) receiving said mixture of oxygen and nitrogen and fuel; said deoxidizer (12) removing oxygen from said nitrogen through a catalytic process; said deoxidizer (12) having an outlet (16) for purified nitrogen, said outlet (16) being coupled to the nitrogen inlet of said membrane extractor (3);characterised in that a bypass line (17) extends from said nitrogen outlet (16) of said deoxidizer (12) to a line (7) downstream of a vacuum pump (6), wherein an adjustable valve (18) is provided in the line (7) to adjust the flow ratio of nitrogen between the membrane extractor (3) and the bypass line (17).2. The system of claim 1, characterised in that the bypass line (17) is coupled to the downstream end of a vacuum pump (6) that is coupled downstream of the membrane extractor (3).3. A method of removal of oxygen from water, comprising the following steps:- bringing oxygen rich water and nitrogen into contact with opposite sides of a membrane (3a) in a membrane extractor (3), causing oxygen to migrate from the oxygen rich water to the nitrogen through the membrane (3a), forming a mixed flow of nitrogen and oxygen,- removing oxygen from the mixed flow (5) of nitrogen and oxygen exiting from the membrane extractor (3), in a deoxidizer through a catalytic process,- characterised in that the flow (16) of deoxidized nitrogen is split into two flows, a first flow that is fed into the membrane extractor (3) and a second flow (17) that is bypassed the membrane extractor (3) and mixed with said mixed flow (7) of oxygen and nitrogen downstream of the membrane extractor (3).4. The method of claim 4, characterised in that the ratio between said first flow and said second flow (17) is adjusted in response to the temperature of the deoxodizer removing oxygen from the mixed flow.Patentkrav1. Et system for fjerning av oksygen fra vann, innbefattende:- en membran ekstraktor (3), hvilken membran ekstraktor har et innløp for oksygenrikt vann og et innløpt for nitrogen; hvilken membran ekstraktor (3) bringer vann og nitrogen i kontakt med motsatte sider av et membran (3), og forårsaker at oksygen migrerer fra vannet til nitrogenet gjennom membranet (3a); hvilken membran ekstraktor (3) har et utløp (4) for oksygenfattig vann og et utløp for oksygen og nitrogen blandingen;- en oksygenfjerner (12) som mottar blandingen av oksygen og nitrogen og brennstoff; hvilken oksygenfjerner (12) fjerner oksygen fra nitrogenet ved hjelp av en katalytisk prosess; hvilken oksygenfjerner (12) har et utløp (16) for renset nitrogen, hvilket utløp (16) er koblet til nitrogeninnløpet til membranekstraktoren (3);karakterisert ved at en bypass ledning (17) strekker seg fra nitrogenutløpet (16) til oksygenfjerner (12) til en ledning (7) nedstrøms av en vakuumpumpe (6), hvor det er tilveiebragt en regulerbar ventil (18) i ledningen (7) for å regulere strømningsforholdet til nitrogen gjennom membran ekstraktoren (3) og bypassledningen (17).2. System i henhold til krav 1, karakterisert ved at bypassledningen (17) er koblet til nedstrømsenden av en vakuumpumpe (6) som er koblet nedstrøms av membranekstraktoren (3).3. Fremgangsmåte for fjerning av oksygen fra vann, innbefattende følgende trinn:- bringe oksygenrikt vann og nitrogen i kontakt med hverandre på motsatte sider av et membran (3a) i en membranekstraktor (3), og forårsake at oksygen migrerer fra det oksygenrike vannet til nitrogenet gjennom membranet (3a) og danner en blandet strøm av nitrogen og oksygen,- fjerne oksygen fra den blandede strømmen (5) av nitrogen og oksygen som kommer ut fra membranekstraktoren (3), i enoksygenfjerner ved hjelp av en katalytisk prosess, karakterisert ved at strømmen (16) av oksygenfjernet nitrogen blir splittet i to strømmer, en første strøm som blir matet inn i membranekstaktoren (3) og en andre strøm (17) som forbigår membranekstraktoren (3) og blir blandet med den blandede strømmen (7) av oksygen og nitrogen nedstrøms av membranekstraktoren (3).4. Fremgangsmåte i henhold til krav 4, karakterisert ved at forholdet mellom nevnte første strøm og nevnte andre strøm (17) blir regulert i respons til temperaturen til oksygenfjerneren som fjerner oksygen fra den blandede strømmen.
Drawings

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Patent classes


IPC classesC02F 1/20B01D 19/00C02F 103/08CPC classesC02F 1/20C02F 2103/08B01D 19/0068

Citations


US 5006133 A (A )WO 2006086046 A2 (A2)US 2010230366 A1 (A1)US 2016096745 A1 (A1)

Applicants, owners and inventors


Owners
Minox Technology AS
Sauheradvn. 93 3683 NOTODDEN NO (NOTODDEN Municipality, Telemark county)Org. number: 974421747
Inventors
Ingvild Lindheim Sisjord
August Cappelensveg 62 3830 ULEFOSS NO (NOME Municipality, Telemark county)
Tor Olav Seltveit
TINNESGATA 37 3675 NOTODDEN NO (NOTODDEN Municipality, Telemark county)

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ACAPO ONSAGERS AS
ACAPO ONSAGERS AS

Org. number: 932214636

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Edvard Griegs vei 1 5059 BERGEN NO (BERGEN Municipality, Vestland county)
Org. number: 932214636
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