Method and device for gas processing

1. A method for processing biogas of a biogas plant, comprising:

performing in one method step a reactive process in which a methane-rich gas mixture is generated in a catalytically activated chemical process, and

performing in at least one further method step an adsorption and/or absorption process for a gas purification to achieve a methane purity greater than 99.5 volume percent, the adsorption and/or absorption process is executed as a precision purification in which a diminishing of a CO 2 concentration in the process gas is executed by utilizing a solid amine adsorber and/or absorber,

performing the reactive process as a pre-purification prior to the adsorption process and/or absorption process, and

performing the adsorption and/or absorption process as a subsequent purification.

2. The method according to claim 1 , wherein at least one adsorption and/or absorption unit is cooled or heated in at least one method step.

3. The method according to claim 2 , wherein heat energy is transferred from the at least one adsorption and/or absorption unit to at least one further adsorption and/or absorption unit.

4. The method according to claim 2 , wherein pressure energy is transferred from the at least one adsorption and/or absorption unit to at least one further adsorption and/or absorption unit.

5. The method according to claim 2 , wherein for a temperaturizing of the adsorption and/or absorption unit waste heat of a power-to-gas plant is utilized, wherein the waste heat is used for a regeneration of an adsorber and/or absorber material located in the at least one adsorption and/or absorption unit.

6. The method according to claim 2 , wherein hydrogen is conveyed to the at least one adsorption and/or absorption unit.

7. The method according to claim 1 , comprising a regeneration phase, in which CO 2 is expelled from the adsorption material and/or absorption material.

8. The method according to claim 1 , wherein in the reactive process at least a methane-rich gas mixture is generated from a CO 2 source in a power-to-gas plant, and biogas is utilized as the CO 2 source.

9. The method according to claim 1 , wherein the CO 2 contained in the biogas is converted in a method step in the reactive process via a catalytic reaction with H 2 in a methanization unit.

10. The method according to claim 1 , carried out in a combination of a biogas plant with a power-to-gas-plant.

11. The method according to claim 1 , wherein the solid amine adsorber and/or absorber selectively binds CO 2 in the further method step.

12. The method according to claim 2 , wherein

the at least one adsorption and/or absorption unit is a plurality of adsorption and/or absorption units that each perform an absorption phase and a regeneration phase, the regeneration phase includes

reducing or evacuating pressure from a solid amine of the amine adsorber and/or absorber as an absorption material and recovering methane out of an empty space of one of the plurality of adsorption and/or absorption units,

heating the solid amine of the amine adsorber and/or absorber as the adsorption material, via a heat carrier fluid, up to a predetermined temperature,

cooling the solid amine of the amine adsorber and/or absorber as the adsorption material, via the heat carrier fluid, by transferring waste heat to another one of plurality of adsorption and/or absorption units that is performing the heating of the solid amine of the amine adsorber and/or absorber as the adsorption material, and

filling or pressurizing the solid amine of the amine adsorber and/or absorber as the adsorption material with the biogas.

13. The method according to claim 12 , wherein thermally connected adsorption and/or absorption units of the plurality of adsorption and/or absorption units each perform a different phase of the regeneration phase and/or the absorption phase.