# US 2020/0399766 A1 · Electrochemical production of carbon monoxide and/or syngas

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- Number: US 2020/0399766 A1
- Document ID: US20200399766A1
- Status: Published application
- Kind: A1
- Application number: 16/964,237
- Filed: 2019-01-18
- Published: 2020-12-24
- Earliest claimed: 2018-02-15
- Assignees: Siemens Aktiengesellschaft; Linde Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft; Linde GMBH
- Inventors: Benjamin Hentschel; Andreas Peschel; Marc Hanebuth; Günter Schmid; Dan Taroata
- Web page: https://patentgrep.com/patent/US20200399766A1

## CPC

- C25B 1/04: by electrolysis of water
- C25B 1/23: Carbon monoxide or syngas
- C25B 9/05: Pressure cells
- C25B 9/19: with diaphragms
- C25B 9/73: of the filter-press type
- C25B 15/08: Supplying or removing reactants or electrolytes; Regeneration of electrolytes
- C25B 15/083: {Separating products}
- C25B 15/087: {Recycling of electrolyte to electrochemical cell}
- Y02E 60/36: Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
- Y02P 20/129: Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
- 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)
- 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

An electrolysis system and an electrolysis method wherein the electrolysis system includes a pressure-electrolytic cell and a throttle in the catholyte line, by which the catholyte flow can be divided into a gas and liquid phase. In this way, (by-)products of the electrolysis can be recycled, while the electrolytic cell can be operated effectively at a high pressure.

## Claims

### Claim 1

An electrolysis system for production of carbon monoxide and/or synthesis gas, comprising:
a pressure electrolysis cell,
a catholyte inlet that leads into the pressure electrolysis cell, and
a catholyte outlet that leads out of the pressure electrolysis cell,
wherein the catholyte outlet opens into a catholyte conduit having a throttle device and a phase separator that divides the catholyte conduit into a catholyte gas conduit and a catholyte liquid conduit.

### Claim 2 (depends on 1)

The electrolysis system as claimed in claim 1,
wherein the catholyte gas conduit has a recycle compressor.

### Claim 3

An electrolysis method for production of carbon monoxide and/or synthesis gas, the method comprising:
introducing reactants into a pressure electrolysis cell and reducing at a cathode, and
reducing the pressure on a gas-laden catholyte stream in order to form a gas phase.

### Claim 4 (depends on 3)

The electrolysis method as claimed in claim 3,
wherein a catholyte gas stream separated from the gas-laden catholyte stream is fed into a recycle compressor.

### Claim 5 (depends on 4)

The electrolysis method as claimed in claim 4,
wherein a catholyte liquid stream that has been freed of catholyte gas is brought to a pressure above 2 bar and then combined with an anolyte stream that has been freed of oxygen.

### Claim 6 (depends on 5)

The electrolysis method as claimed in claim 5,
wherein a gas-laden anolyte stream is freed of oxygen by means of a gas-liquid separation.

### Claim 7 (depends on 6)

The electrolysis method as claimed in claim 6,
wherein the anolyte stream that has been freed of oxygen is combined again with the catholyte liquid stream to give an electrolyte stream.

### Claim 8 (depends on 7)

The electrolysis method as claimed in claim 7,
wherein an entire gas phase that forms at the cathode is introduced back into the pressure electrolysis cell.

### Claim 9 (depends on 8)

The electrolysis method as claimed in claim 8,
wherein a gas mixture removed after expansion is guided directly into a gas separation.

### Claim 10 (depends on 9)

The electrolysis method as claimed in claim 9,
wherein waste heat from the electrolysis is removed via the electrolyte stream.