Synthesis gas production from co2 and steam for synthesis of fuels

Patent metadata

Field	Value
Publication number	US-2024025818-A1
Application number	US-202218257339-A
Country	US
Kind code	A1
Filing date	Jan 19, 2022
Priority date	Jan 27, 2021
Publication date	Jan 25, 2024
Grant date	—

Abstract

A system is described for providing a hydrocarbon product stream. An electrolysis section provides a syngas stream from a first feed comprising CO 2 and a second feed comprising H 2 O, which is then passed to an F-T section where it is converted to a hydrocarbon product stream and a tail gas stream. An electrical steam reformer section said tail gas stream and convert it to a second syngas stream, which is then recycled upstream the FT section. A process is also provided for converting a first feed comprising CO 2 and a second feed comprising H 2 O to a first hydrocarbon product stream in a system according to the invention. The system of the invention can be combined with an upgrading section, in a gas-to-liquid plant.

First claim

1 . A system for providing a first hydrocarbon product stream,
said system comprising: a Fischer-Tropsch section, an electrolysis section arranged upstream said F-T section, a first feed comprising CO 2 to the electrolysis section, a second feed comprising H 2 O to the electrolysis section, a first electrical steam reformer section,
wherein
said electrolysis section is arranged to provide a first syngas stream from said first and said second feeds,
said F-T section is arranged to receive at least a first portion of said first syngas stream and convert it to a first hydrocarbon product stream and a tail gas stream,
and wherein—optionally— said first electrical steam reformer section is arranged to receive at least a second portion of said first syngas stream and convert it to a second syngas stream,
said first electrical steam reformer section is arranged to receive at least a first portion of said tail gas stream and convert it to a second syngas stream, and wherein said second syngas stream is arranged to be fed to the F-T section, preferably in admixture with the first syngas stream.

2 . The system according to claim 1 , wherein the electrolysis section comprises a single electrolysis unit arranged to convert said first and said second feeds to a first syngas stream, preferably wherein first and said second feeds are arranged to be mixed prior to being fed to the electrolysis section-R.

3 . The system according to claim 1 , wherein the electrolysis section comprises at least a first electrolysis unit and a second electrolysis unit, wherein the first electrolysis unit is arranged to convert the first feed comprising CO 2 to a first stream comprising CO, and wherein the second electrolysis unit is arranged to convert the second feed comprising H 2 O to a second stream comprising H 2 , and wherein said electrolysis section is further arranged to combine said first stream comprising CO with said second stream comprising H 2 to said first syngas stream.

4 . The system according to claim 1 , wherein one or all of the electrolysis units in the electrolysis section is/are a solid oxide electrolysis unit.

5 . The system according to claim 1 , wherein the second electrolysis unit is an alkaline/polymer electrolyte membrane electrolysis unit e.g. an alkaline/PEM electrolysis unit.

6 . The system according to claim 1 , further comprising a hydrogenation section arranged in the tail gas stream between the F-T section and the first electrical steam reformer section, said hydrogenation section arranged to hydrogenate the tail gas stream.

7 . The system according to claim 1 , further comprising a CO conversion section arranged in the tail gas stream between the F-T section and the first electrical steam reformer section, said CO conversion section arranged to perform water gas shift reaction and/or methanation on the tail gas stream.

8 . The system according to claim 1 , comprising a CO conversion section and a hydrogenation section arranged in the tail gas stream between the F-T section and the first electrical steam reformer section, wherein the hydrogenation section is arranged upstream the CO conversion section.

9 . The system according to claim 1 , further comprising a waste heat boiler arranged to cool the second syngas stream from the first electrical steam reformer section, and wherein steam provided from said waste heat boiler is provided as the second feed.

10 . The system according to claim 1 , further comprising a third feed comprising CO 2 to the first electrical steam reformer section.

11 . The system according to claim 10 , wherein said third feed further comprises H 2 .

12 . A GTL plant comprising the system according to claim 1 , said GTL plant further comprising an upgrading section arranged to receive the first hydrocarbon product stream and provide an end product stream, wherein the end product stream is preferably a diesel stream, a kerosene stream, a Liquefied Petroleum Gas stream or a naphtha stream.

13 . The GTL plant according to claim 12 , wherein the upgrading section is arranged to provide an LPG stream, and wherein said GTL plant further comprises a second electrical steam reformer section arranged to receive at least a portion of said LPG stream and convert it to a third synthesis gas stream.

14 . The GTL plant according to claim 13 , wherein the first and the second electrical steam reformer sections are comprised by a combined electrical steam reformer section, in which a combined synthesis gas stream is produced from at least a portion of said LPG stream and said at least a first portion of said tail gas stream, wherein the combined synthesis gas stream is arranged to be fed to the F-T section as said second syngas stream.

15 . A process for converting a first feed comprising CO 2 and a second feed comprising H 2 O to a first hydrocarbon product stream in a system according to claim 1 , said process comprising the steps of,
converting said first and said second feeds to a first syngas stream in said electrolysis section-R, feeding at least a first portion of said first syngas stream to said F-T section and converting it to a first hydrocarbon product stream and a tail gas stream, optionally—feeding at least a second portion of said first syngas stream to the first electrical steam reformer section and converting it to a second syngas stream, feeding at least a portion of said tail gas stream to said first electrical steam reformer section and converting it to a second syngas stream, and feeding the second syngas stream to the F-T section, preferably in admixture with the first syngas stream.

16 . The process according to claim 15 , wherein the first feed comprising CO 2 comprises a minor amount of hydrocarbons, preferably in an amount of less than 10%, such as less than 5%, or most preferably less than 3% by volume of said first feed.

17 . The process according to claim 15 , wherein the H 2 /CO-ratio in the synthesis gas at the inlet to the F-T section is between 1.8 and 2.2, such as between 1.9 and 2.1, or around 2.0.

18 . The process according to claim 15 , wherein the electric power required to power the electrolysis section and/or the electrical steam reformer section, is provided at least partly by renewable sources, such as wind and solar energy.

19 . A process for providing an end product stream, such as a diesel stream, a kerosene stream, an LPG stream or a naphtha stream, said process comprising performing the process according to claim 15 , followed by upgrading the first hydrocarbon product stream and provide an end product stream by means of an upgrading section.

Assignees

• Topsoe As

Inventors

• Aasberg-Petersen Kim
• Mortensen Peter Mølgaard

Classifications

• C07C1/0485 Primary

  Set-up of reactors or accessories; Multi-step processes · CPC title

• C01B3/12

  by reaction of water vapour with carbon monoxide · CPC title

• C01B3/384

  with external heating of the catalyst · CPC title

• C25B1/23

  Carbon monoxide or syngas · CPC title

• C25B13/05

  based on inorganic materials · CPC title