Japanese Patent JPH0437001

B2

PURPOSE:To produce hydrogen at an excellent reaction rate, with high heat efficiency and in high yield by improving the process when gaseous hydrogen is thermochemically produced from water by an Mg-S-I cycle method. CONSTITUTION:A gaseous mixture of SO2 and O2 is blown into an aq. slurry at 0-120 deg.C wherein MgO and I2 are suspended in water to form a slurry consisting of an aq. soln. of MgSO4 and MgI2. The slurry is separated by filtration, centrifugation, etc., into an MgSO4 crystal and a concd. soln, of MgI2. The concd. soln. of MgI2 is heated, concentrated and evaporated to dryness. The residue is further heated at 400 deg.C to generate HI and the residue of MgO is returned to the first stage. The MgSO4 obtained by the preceding stage is brought into contact with an aq. soln. and the soln. is heated at 900-1,200 deg.C to generate SO2 and O2 and the residue of MgO is returned to the first stage. Then the HI is brought into contact with an aq. soln. and the soln. is thermochemically decomposed by electrical energy into a gaseous mixture of H2 and I2. The I2 is condensed with use of a separation membrane or by cooling and high-purity gaseous H2 is separated from the I2 and recovered in high yield.

MIZUTA SUSUMU
KUMAGAI TOSHA

JP20131785A

June 18, 1992

September 11, 1985

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KOGYO GIJUTSUIN

C01B3/02; C01B3/12; C01B3/14

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