Process to recycle carbon dioxide co2

Abstract

The invention refers to a recycling process of a so-called gaseous flow ( 106 ) of CO 2 essentially containing molecules of CO 2 , said process comprising the following steps: heating of said gaseous flow of CO 2 at a pyrolysis temperature of the material containing carbon ( 104 ); pyrolysis of a load of a carbon-containing material ( 104 ) containing elements of carbon by said gaseous flow, said pyrolysis reducing the molecules of CO 2 by said elements of carbon to produce a first gaseous flow ( 110 ) essentially containing molecules of carbon monoxide (CO) at high temperature; oxidation of said molecules of carbon monoxide (CO) by elements of oxygen (O), said oxidation producing a second gaseous flow ( 114 ) essentially containing molecules of CO 2 ; reduction of said molecules of CO 2 of said second gaseous flow ( 114 ), said reduction supplying a third gaseous flow ( 120 ) essentially containing molecules of carbon monoxide (CO). It also refers to a system to perform such a process.

1 . A system to recycle an initial gaseous flow essentially containing carbon dioxide (CO 2 ), said system comprising:
 a mill to mill a load comprising a material containing carbon;   a heat source for heating said initial gaseous flow at a pyrolysis temperature of the material containing carbon of the load comprising the material containing carbon;   a first zone, or pyrolysis zone, for performing pyrolysis of the load comprising the material containing carbon by said initial gaseous flow at said pyrolysis temperature of the material containing carbon, said pyrolysis reducing said CO 2  and producing a first gaseous flow comprising carbon monoxide (CO);   a second zone, or oxidation zone, for performing oxidation of said CO, said oxidation producing a second gaseous flow containing CO 2 ; and   a third zone, or reduction zone, for performing reduction of said CO 2  of said second gaseous flow, said reduction supplying a third gaseous flow comprising CO.   
     
     
         2 . The system of  claim 1 , wherein the second zone comprises oxygen-holding oxides in the oxidized state (MeO, where Me is a metal), provides a supply of oxygen to oxidize said CO of the first gaseous flow, wherein said oxygen-holding oxides in the oxidized state (MeO) are reduced after said oxidation to oxygen-holding oxides in the reduced state (Me). 
     
     
         3 . The system of  claim 1 , wherein the third zone contains oxygen-holding oxides in the reduced state (Me) that reduce said CO 2  of the second gaseous flow. 
     
     
         4 . The system of  claim 2 , further comprising a thermal exchanger for:
 transference of oxygen-holding oxides in the reduced state (Me) obtained after the oxidation of said CO from the first gaseous flow, from the second zone to the third zone; and   the transference of the oxygen-holding oxides in the oxidized state (MeO) obtained after the reduction of said CO 2  from the second gaseous flow, from the third zone to the second zone.   
     
     
         5 . The system of  claim 2 , wherein Me is nickel. 
     
     
         6 . The system of  claim 1 , wherein the heat source comprises at least one thermal exchanger for one or more of:
 transference of thermal power from the second gaseous flow to the initial gaseous flow; or   transference of thermal power from the third gaseous flow to the initial gaseous flow.   
     
     
         7 . The system of  claim 1 , further comprising means to put said system in depression.