Production Method for Carbon Fibre Material for Separating Co2 or Nh3 from Gas Mixtures, Carbon Fibre Material, and Use Thereof

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This patent describes a simple and efficient method for producing a high-performance carbon fibre material with ultra-micropores, which is specifically designed to selectively separate carbon dioxide (CO2) or ammonia (NH3) from gas mixtures. The process uses polyacrylonitrile (PAN) as the base polymer, avoiding the use of metal, silicon, or sulfur additives and skips additional stabilization or chemical surface modification steps. The resulting carbon nanofibre mats exhibit very high selectivity and capacity for CO2 and NH3 adsorption due to their finely tuned pore structure.

Use CasesContent extracted from patent full text and abstract with AI.

• Capturing CO2 from industrial exhaust gases to reduce greenhouse gas emissions.
• Removing CO2 from biogas or natural gas to upgrade the gas quality.
• Selective separation of NH3 from gas streams, such as in ammonia fuel cells or waste gas treatments.
• Use in air purification systems to filter out greenhouse gases.
• Supporting synthetic fuel production by enabling efficient removal or enrichment of target gases (CO2 or NH3).
• Enhanced gas separation in membrane-based or adsorption columns in industrial processes.
• Drying gases by adsorbing water vapor when carbonized at higher temperatures.

BenefitsContent extracted from patent full text and abstract with AI.

• Simplified, cost-effective production method without complex additives or surface treatments.
• High selectivity for CO2 or NH3, enabling efficient separation from other gases like N2 or Ar.
• Reversible adsorption, allowing repeated use and simplified regeneration.
• Customizable pore structure based on carbonization temperature, optimizing performance for desired gas separation.
• Robust, thermally and chemically stable carbon fibre material suitable for harsh industrial conditions.
• High gas adsorption capacity at low pressures, making the material effective in energy-efficient vacuum swing or pressure swing adsorption systems.
• Avoids expensive or moisture-sensitive adsorbents like zeolites, offering a more economical solution.

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Patent Abstract

The invention relates to a method for producing a carbon fibre material, comprising the steps: a) producing a solution of polyacrylonitrile in a suitable organic solvent; b) electrospinning the solution obtained in a) and drying the fibre material obtained; c) crosslinking the fibre material obtained by heating to 150 to 350°C in an air or an oxygen atmosphere for 1 to 30 h; d) carbonising the fibre material obtained in an inert gas atmosphere at a temperature in the range of 500 to 2500°C, preferably 600 to 900°C, even more preferably 800 to 875°C, characterised in that in step a) no silicon, sulphur, metal compounds, intermetal compounds, silicon compounds and/or sulphur compounds are added to the polyacrylonitrile solution, and in that neither stabilisation nor surface modification steps by treatment with chemical reagents and/or application of tensile stress area performed with the fibre material obtained. The invention also relates to a carbon fibre material obtainable by the method described above, and to a carbon fibre material, characterised in that it comprises a proportion of ultra-micropores of V