# US 2025/0146142 A1 · Method for generating synthesis gas for use in hydroformylation reactions

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- Number: US 2025/0146142 A1
- Document ID: US20250146142A1
- Status: Published application
- Kind: A1
- Application number: 18/987,417
- Filed: 2024-12-19
- Published: 2025-05-08
- Earliest claimed: 2018-04-13
- Assignees: Haldor TopsøE A/S
- Applicants: Haldor TopsøE A/S
- Inventors: Niels Christian SCHJØDT; Rainer KÜNGAS; Berit HINNEMANN; Bengt Peter Gustav BLENNOW
- Web page: https://patentgrep.com/patent/US20250146142A1

## CPC

- C25B 1/04: by electrolysis of water
- C25B 1/23: Carbon monoxide or syngas
- C01B 3/06: by reaction of inorganic compounds containing electro-positively bound hydrogen with inorganic reducing agents
- C01B 32/40: Carbon monoxide
- C07C 45/50: by oxo-reactions
- C10K 1/04: by cooling to condense non-gaseous materials {(C10K1/001 takes precedence)}
- C10K 3/026: {Increasing the carbon monoxide content, e.g. reverse water-gas shift [RWGS]}
- C25B 1/042: by electrolysis of steam
- C25B 9/19: with diaphragms
- C25B 9/70: Assemblies comprising two or more cells
- C25B 9/77: having diaphragms
- C25B 13/05: based on inorganic materials
- C25B 13/07: based on ceramics
- C25B 15/021: of heating or cooling
- C25B 15/08: Supplying or removing reactants or electrolytes; Regeneration of electrolytes
- C25B 15/081: {Supplying products to non-electrochemical reactors that are combined with the electrochemical cell, e.g. Sabatier reactor}
- C25B 15/083: {Separating products}
- C25B 15/087: {Recycling of electrolyte to electrochemical cell}
- C01B 2203/02: Processes for making hydrogen or synthesis gas
- C01B 2203/0495: the impurity being water
- C01B 2203/06: Integration with other chemical processes
- C01B 2203/12: Feeding the process for making hydrogen or synthesis gas
- Y02E 60/36: Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
- Y02P 20/00: Technologies relating to chemical industry
- C25B: ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR (anodic or cathodic protection C23F13/00; single-crystal growth C30B)
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C10K: PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A method for the generation of a gas mixture including carbon monoxide, carbon dioxide, and hydrogen for use in hydroformylation plants, including: evaporating water to steam; feeding the steam to a solid oxide electrolysis cell (SOEC) while supplying an electrical current to the SOEC to effect a partial conversion of steam to hydrogen; utilizing the effluent SOEC gas including H2 together with CO2 from an external source as feed for a RWGS reactor in which the RWGS reaction takes place, converting some of the CO2 and H2 to CO and H2O; removing some of or all the remaining steam from the raw product gas stream by cooling the raw product gas stream allowing for condensation of at least part of the steam as liquid water and separating the remaining product gas from the liquid; using the gas mixture for liquid phase hydroformylation, while recycling CO2 to the RWGS reactor.

## Claims

### Claim at position 1

1-3. (canceled)

### Claim 4

A method for the generation of a gas mixture comprising carbon monoxide, carbon dioxide and hydrogen for use in hydroformylation plants, comprising the steps of:
evaporating water to steam,
feeding the steam to a solid oxide electrolysis cell (SOEC) or an SOEC stack at a sufficient temperature for the cell or cell stack to operate while supplying an electrical current to the SOEC or SOEC stack to effect a partial conversion of steam to hydrogen forming a raw product gas,
feeding CO2 from an external source,
utilizing the raw product gas comprising H2 together with the CO2 as feed for a reverse water gas shift (RWGS) reactor in which the RWGS reaction takes place, converting some of the CO2 and H2 to CO and H2O forming a RWGS product gas,
removing at least some of the remaining steam from the RWGS product gas stream by cooling the RWGS product gas stream allowing for condensation of at least part of the steam as liquid water and separating a remaining product gas from the liquid water, the remaining product gas comprising CO, CO2 and H2, and
using the remaining product gas for a liquid phase hydroformylation process utilizing the carbon monoxide and hydrogen as reactants, wherein the CO2 in the remaining product gas is sufficient to form a CO2-expanded liquid (CXL) reaction medium for the hydroformylation process.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the temperature, at which H2 is produced by electrolysis of H2O in the SOEC or SOEC stack, is around 700° C.

### Claim 6 (depends on 4)

The method according to claim 4, comprising removing essentially all the remaining steam from the RWGS product gas stream by cooling the RWGS product gas stream allowing for condensation of the steam as liquid water and separating the remaining product gas from the liquid water.

### Claim 7 (depends on 4)

The method according to claim 4, comprising removing at least some of remaining steam from the raw product gas stream by cooling the raw product gas stream allowing for condensation of at least part of the steam as liquid water and separating the dried raw product gas from the liquid, and utilizing the dried raw product gas in the reverse water gas shift (RWGS) reactor.

### Claim 8 (depends on 4)

The method according to claim 4, comprising removing essentially all of remaining steam from the raw product gas stream by cooling the raw product gas stream allowing for condensation of essentially all of the steam as liquid water and separating the dried raw product gas from the liquid, and utilizing the dried raw product gas in the reverse water gas shift (RWGS) reactor.

### Claim 9 (depends on 4)

The method according to claim 4, comprising removing essentially all the remaining steam from the RWGS product gas stream by cooling the RWGS product gas stream allowing for condensation of essentially all of the steam as liquid water and separating a remaining product gas from the liquid water, the remaining product gas comprising CO, CO2 and H2.

### Claim 10 (depends on 4)

The method according to claim 4, wherein the RWGS reactor is a heated reactor.

### Claim 11 (depends on 4)

The method according to claim 4, wherein the RWGS reactor is an adiabatic reactor.

### Claim 12 (depends on 4)

The method according to claim 4, comprising flushing an oxygen side of the SOEC or SOEC stack.

### Claim 13 (depends on 12)

The method according to claim 12, wherein flushing is with air, nitrogen, steam or carbon dioxide.

### Claim 14 (depends on 4)

The method according to claim 4, comprising operating the SOEC or SOEC stack endothermic.

### Claim 15 (depends on 4)

The method according to claim 4, comprising recycling CO2 from the hydroformylation process to the RWGS reactor.

### Claim 16 (depends on 4)

The method according to claim 4, comprising feeding excess CO2 from the external source.

### Claim 17 (depends on 4)

The method according to claim 4, comprising recycling CO2 from the hydroformylation process to the RWGS reactor.

### Claim 18

A method for the generation of a gas mixture comprising carbon monoxide, carbon dioxide and hydrogen for use in hydroformylation plants, comprising the steps of:
evaporating water to steam,
feeding the steam to a solid oxide electrolysis cell (SOEC) or an SOEC stack at a sufficient temperature for the cell or cell stack to operate while supplying an electrical current to the SOEC or SOEC stack to effect a partial conversion of steam to hydrogen forming a raw product gas,
feeding excess CO2 from an external source,
utilizing the raw product gas comprising H2 together with the CO2 as feed for a reverse water gas shift (RWGS) reactor in which the RWGS reaction takes place, converting some of the CO2 and H2 to CO and H2O forming a RWGS product gas,
removing at least some of the remaining steam from the RWGS product gas stream by cooling the RWGS product gas stream allowing for condensation of at least part of the steam as liquid water and separating a remaining product gas from the liquid water, the remaining product gas comprising CO, CO2 and H2, and
using the remaining product gas for a liquid phase hydroformylation process utilizing the carbon monoxide and hydrogen as reactants, while utilizing the CO2 to form a CO2-expanded liquid (CXL) reaction medium for the hydroformylation process.

### Claim 19

A method for the generation of a gas mixture comprising carbon monoxide, carbon dioxide and hydrogen for use in hydroformylation plants, comprising the steps of:
evaporating water to steam,
feeding the steam to a solid oxide electrolysis cell (SOEC) or an SOEC stack at a sufficient temperature for the cell or cell stack to operate while supplying an electrical current to the SOEC or SOEC stack to effect a partial conversion of steam to hydrogen forming a raw product gas,
feeding CO2 from an external source,
utilizing the raw product gas comprising H2 together with the CO2 as feed for a reverse water gas shift (RWGS) reactor in which the RWGS reaction takes place, converting some of the CO2 and H2 to CO and H2O forming a RWGS product gas,
removing at least some of the remaining steam from the RWGS product gas stream by cooling the RWGS product gas stream allowing for condensation of at least part of the steam as liquid water and separating a remaining product gas from the liquid water, the remaining product gas comprising CO, CO2 and H2, and
using the remaining product gas for a liquid phase hydroformylation process utilizing the carbon monoxide and hydrogen as reactants, while utilizing the CO2 to form a CO2-expanded liquid (CXL) reaction medium for the hydroformylation process
recycling CO2 from the hydroformylation process to the RWGS reactor.