A process and reactor for converting carbon dioxide into carbon monoxide

Abstract

The present invention relates to a process for converting carbon dioxide and hydrogen into a product stream comprising carbon monoxide, water and hydrogen, the process comprising introducing carbon dioxide, hydrogen and oxygen into a reaction vessel, and performing a reverse water gas shift reaction at elevated temperature, wherein (a) no catalyst is present in the reaction vessel, and (b) at least a gas stream comprising carbon dioxide, a hydrogen rich gas stream and an oxygen rich gas stream are introduced into the reaction vessel in separate feed streams, wherein the hydrogen rich gas stream is introduced into the reaction vessel at a temperature between 15 and 450 DEG C, (c) the hydrogen rich gas stream and oxygen rich gas stream being introduced in close vicinity of each other, wherein at least the hydrogen rich gas stream and the oxygen rich gas stream are introduced into the reaction vessel via a burner comprising coaxial channels for the separate introduction of the different gas streams, the burner being located at the top of the reaction vessel, wherein the hydrogen and oxygen in the hydrogen rich gas stream and oxygen rich gas stream undergo a combustion reaction upon entering the reaction vessel, thereby providing the heating energy required for the reverse water-gas shift reaction; and (d) the temperature in the reaction vessel is maintained in the range of 1000 to 1500 DEG C by varying the molar ratio of hydrogen to oxygen, which are introduced into the reaction vessel in the hydrogen rich gas stream and oxygen rich gas stream, respectively.

Description

technical field [0001] The present invention relates to a process for converting carbon dioxide and hydrogen to a product stream comprising carbon monoxide, water and hydrogen. Further, the invention relates to a reverse water gas shift process unit suitable for use in said method. [0002] The method and process unit can be used to reduce the carbon footprint of certain industrial technologies. Further, the method and process unit can be used for the production of synthesis gas. Background technique [0003] Global economic growth and development have led to increased demand for energy, which has resulted in the release of greenhouse gases into the atmosphere. Increased concentrations of greenhouse gases, especially carbon dioxide, have contributed to global warming. It is imperative to reduce the global carbon footprint to mitigate global warming, and this has been regarded as one of the most important challenges facing mankind in the 21st century. The Earth system's c...

AI Technical Summary

Problems solved by technology

Achieving highly selective conversion of carbon dioxide to carbon monoxide and avoiding by-products such as methane and carbon formation requires high temperatures around 1200 °C, which requires high heat transfer from external furnaces, which poses a considerable engineering challenge when scaled up to large scale.

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