Process for the removal of carbon dioxide from a gas mixture containing hydrogen
A process is described for the removal of carbon dioxide from a gas mixture containing hydrogen by contacting the gas mixture with a shaped sorbent comprising a plurality of layers of photopolymerized resin containing particles of a molecular sieve carbon dioxide sorbent material.
1 . A process for the removal of carbon dioxide from a gas mixture containing hydrogen by contacting the gas mixture with a shaped sorbent comprising a plurality of layers of photopolymerized resin containing particles of a molecular sieve carbon dioxide sorbent material, wherein the photopolymerised resin is derived from a urethane-based photopolymer comprising a mixture of multifunctional monomers and oligomers functionalized by an acrylate.
2 . The process according to claim 1 , wherein the molecular sieve carbon dioxide sorbent material comprises a zeolite mat.
3 . The process according to claim 1 , wherein the maximum particle size (Dv100) of the molecular sieve carbon dioxide sorbent material in the shaped sorbent is less than the layer thickness.
4 . The process according to claim 1 , wherein the shaped sorbent comprises from 1 to 70% by volume of molecular sieve carbon dioxide sorbent material.
5 . The process according to claim 1 , wherein the shaped sorbent is foamed.
6 . The process according to claim 1 , wherein the shaped sorbent comprises 5 to 5000 layers.
7 . The process according to claim 1 , wherein each layer of the plurality of layers in the shaped sorbent has a thickness in the range of from 10 to 300 μm.
8 . The process according to claim 1 , wherein the shaped sorbent is a particulate material with a cross-sectional length, width or height, in the range of from 0.3 mm to 100 mm.
9 . The process according to claim 1 , wherein the shaped sorbent is a flow-through monolith with a cross-sectional length width or height, in the range of from 10 to 200 cm.
10 . The process according to claim 1 , wherein the gas mixture containing hydrogen is derived from an electrolysis process or from a process that converts a hydrocarbon or carbonaceous fossil fuel, biomass or municipal waste to synthesis gas containing hydrogen and carbon dioxide.
11 . The process according to claim 1 , wherein the hydrogen-containing gas mixture is a synthesis gas stream comprising hydrogen and carbon dioxide having a carbon dioxide content in the range 1 to 50% by volume.
12 . The process according to claim 1 , wherein the adsorption of carbon dioxide from the gas mixture is performed at a temperature in the range 10-200° C. and at a pressure in the range of 1 to 100 bar abs.
13 . The process according to claim 1 , wherein the adsorption of carbon dioxide from the hydrogen-containing gas mixture is performed in a pressure-swing adsorption (PSA) process, a vacuum swing adsorption (VSA) process, a temperature swing adsorption (TSA) process, or a combination of two or more of these.
14 . The process according to claim 1 , wherein the molecular sieve carbon dioxide sorbent material comprises a zeolite material selected from zeolite 13X and zeolite 5A.
15 . The process according to claim 1 , wherein the maximum particle size (Dv100) of the molecular sieve carbon dioxide sorbent material in the shaped sorbent is less than a half the layer thickness.
16 . The process according to claim 1 , wherein the maximum particle size (Dv100) of the molecular sieve carbon dioxide sorbent material in the shaped sorbent is no less than a fifth of the layer thickness.
17 . The process according to claim 1 , wherein each layer of the plurality of layers in the shaped sorbent has a thickness in the range of from 20 to 100 μm.
18 . The process according to claim 1 , wherein the shaped sorbent is a particulate material with a cross-sectional length, width or height, in the range of from 0.3 mm to 50 mm.
19 . The process according to claim 1 , wherein the hydrogen-containing gas mixture is a synthesis gas stream comprising hydrogen and carbon dioxide having a carbon dioxide content in the range 1 to 50% by volume, also containing water vapour, carbon monoxide and methane each in the range of 0 to 1% by volume, with the remainder of the gas mixture consisting of hydrogen.