Patent ID: 7717979

Claim:
A process for preparing a composition for a desulfurizer, wherein the composition comprises three kinds of iron oxides which are ferroferric oxide in the form of cubic crystalline phase (Fe 3 O 4 ), amorphous ferric oxide (Fe 2 O 3 ) and amorphous ferric oxide monohydrate (Fe 2 O 3 .H 2 O), wherein the contents of the iron oxides in said composition are: 3.0 wt % to 3.5 wt % of Fe 3 O 4 , 28 wt % to 30 wt % of Fe 2 O 3 , 60 wt % to 62 wt % of Fe 2 O 3 .H 2 O, the balance being water and residual by-products of this reaction, the above percentages are based on the total weight of said compositions, the process comprising the following steps: (1) mixing a solid ferrous compound with a solid hydroxide at a molar ratio of iron to hydroxyl in the range from 1:2 to 1:3; (2) kneading the mixture feeds obtained in step (1) and making them react completely; (3) drying the products obtained in step (2) in the air; (4) washing and filtering the feeds obtained instep (3); and (5) drying at ambient temperature or baking the solids obtained in step (4) to form the composition for a desulfurizer.