초록 ▼

Decomposition of water to hydrogen and oxygen with the aid of a thermochemical cyclic process based upon the iron/chlorine system by reduction of FeCl2 in the presence of H2 to Fe, oxidation of the Fe with steam to Fe3O4, treatment of the hot Fe3O4 with steam and chlorine to obtain oxygen, conversio

Decomposition of water to hydrogen and oxygen with the aid of a thermochemical cyclic process based upon the iron/chlorine system by reduction of FeCl2 in the presence of H2 to Fe, oxidation of the Fe with steam to Fe3O4, treatment of the hot Fe3O4 with steam and chlorine to obtain oxygen, conversion of themixture of iron oxides so obtained with hydrogen chloride to FeCl2 and recycling of the FeCl2 to the reduction stage, wherein a part of the heat required for the process is supplied by heating the hydrogen and steam in indirect heat exchange with a hot coolant from a high temperature nuclear reactor. The conversion of the iron oxides to FeCl2 is carried out via the intermediate stage of dimeric FeCl3 and it is thus possible to convey the solid reaction products by free fall through the reaction zones.

대표청구항 ▼

A method for obtaining hydrogen by decomposing water in a thermochemical process employing adjuvants selected from the group consisting of inorganic iron compounds, chlorine and hydrogen chloride comprising the steps of: a. reducing iron chloride selected from the group consisting of iron(II)chlorid

A method for obtaining hydrogen by decomposing water in a thermochemical process employing adjuvants selected from the group consisting of inorganic iron compounds, chlorine and hydrogen chloride comprising the steps of: a. reducing iron chloride selected from the group consisting of iron(II)chloride, iron(III)chloride and mixtures thereof at a temperature of about 525°to 1300°C in a first reaction zone with hydrogen to iron; b. supplying the iron to a second reaction zone and then converting it to Fe3O4 by reaction with steam heated to above 225°C, wherein the heat energy of the effluent gases containing hydrogen from the two reaction zones may be employed for heating reactants selected from the group consisting of hydrogen and steam in other reaction zones; c. separating the hydrogen, after the use of the heat, from the effluent gases of the two reaction zones and removing the part of the hydrogen not employed for the reduction of the iron chloride in the first reaction zone as an end product; d. withdrawing the hot Fe3O4 at approximately 900°to 1100°C from the second reaction zone and supplying it as a heat carrier to a third reaction zone in which it provides the heat required for the conversion carried out therein at a temperature range of about 225°to 1100°C of water and iron(II/III)oxide with chlorine accompanied by the evolution of oxygen; e. separating the oxygen from the cooled effluent gas from the third reaction zone and removing said oxygen as an end product; f. withdrawing the approximately 400°to 800°C hot mixture of iron oxides from the third reaction zone and supplying said mixture of iron oxides to a fourth reaction zone in which the iron oxides are converted with hydrogen chloride at 200°to 850°C to iron chloride selected from the group consisting of iron(II)chloride iron(III)chloride and mixtures thereof; and g. recycling said iron chloride from said fourth reaction zone to the first reaction zone.