Method for conversion of carbon dioxide into hydrocarbons
AssigneeKing Saud University
InventorsMazen Abdullah Ba-Abbad, Hany Al-Ansary, Essam Al-Ammar
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Abstract
The present invention relates to a method for converting carbon dioxide into hydrocarbons by reacting magnesium with carbon dioxide to obtain magnesium oxide and carbon, reacting the carbon with hot water steam to obtain hydrogen (H2) and carbon monoxide, reacting hydrogen and carbon monoxide according to the Fischer-Tropsch method, or reacting the carbon obtained with earth alkaline metal oxide to obtain earth alkaline metal carbide and carbon monoxide, wherein the earth alkaline metal carbide is then reacted with water to obtain acetylene and earth alkaline metal hydroxide.
Claims15
A method for converting carbon dioxide into hydrocarbons, comprising the steps:
- a) compressing air, optionally under removal of condensed water vapor, to a pressure of above 50 atmospheres, cooling the compressed air to about ambient temperature, separating carbon dioxide (CO2) from oxygen (O2) and nitrogen (N2), storing carbon dioxide in a storage tank and storing heat generated during compression or cooling in a heat storage medium;
- b) electrolyzing water to produce hydrogen (H2) and oxygen (O2), compressing gases obtained and storing heat generated during compression;
- c) releasing carbon dioxide from the storage tank and reacting with magnesium metal to produce magnesium oxide and carbon according to the following equation (1)
- 2Mg+CO2→2MgO+C (1);
- and
- d1) burning oxygen and hydrogen obtained in step b) in a hydrogen torch to obtain hot steam of a temperature of about 2000 to 2400° C., cooling the hot steam to a temperature of about 600 to 1000° C. and then reacting the steam with carbon obtained in step c) according to the following equation (2)
- H2O+C→H2+CO, (2);
- e1) Fischer-Tropsch reaction of CO and H2 obtained in step d1) according to the following equation (3a)
- nCO+(2n+1)H2→CnH(2n+2)+nH2O (3a);
- or
- d2) reacting the carbon obtained in step c) with earth alkaline metal oxide MeO, Ca or Mg, at a temperature of about 1.800 to 2.200° C. according to the following equation (4)
- MeO+3C→MeC2+CO (4);
- e2) reacting the earth alkaline carbide obtained in step d2) with water to produce acetylene and/or acetylene derivatives;
- or
- d3) reacting the carbon obtained in step c) with alumina according to the following equation (5)
- 2Al2O3+9C→Al4C3+6CO (5);
- e3) reacting the aluminum carbide with water according to the following equation (6)
- Al4C3+12H2O→4Al(OH)3+3CH4 (6);
- or
- d4) reacting the carbon obtained in step c) with beryllium oxide according to the following equation (7)
- 2BeO+3C→Be2C+2CO (7);
- and
- e4) reacting beryllium carbide obtained in step d4) with water according to the following equation (8)
- Be2C+2H2O→2BeO+CH4 (8).
Dependencies are inferred from the claim text.