Abstract: A method of preparing magnetic iron oxide Fe21.333O32, which includes the steps of preparing a solid green rust and calcining the solid green rust to obtain the magnetic iron oxide Fe21.333O32. Also provided is the application of magnetic iron oxide Fe21.333O32 as an active material in desulfurization at a medium temperature. Also provided is a desulfurizer which uses magnetic iron oxide Fe21.333O32 and the application thereof. The present preparation method has simple steps and a short production period.

Abstract: Provided is a preparation method of magnetic iron oxide Fe21.333O32, comprising the following steps, preparing a solid green rust; and then calcining said solid green rust to obtain a magnetic iron oxide Fe21.333O32. Also provided is the application of the magnetic iron oxide Fe21.333O32 as active materials of desulfurization at medium temperature. Also provided is a desulfurizer comprising the magnetic iron oxide Fe21.333O32 and the application thereof. The preparation method has simple steps and short production period.

Abstract: Methods for regenerating amorphous iron oxide hydroxide after being used as desulfurizer by (1) grinding a waste mixture into waste powder, wherein the waste mixture results from use of the composition comprising amorphous iron oxide hydroxide as desulfurizer; (2) preparing the waste powder into a suspension and charging the suspension with a gas containing oxygen to obtain a slurry comprising amorphous iron oxide hydroxide and elemental sulfur; and (3) placing the slurry or a solid resulting from filtering the slurry into a container and charging the slurry or the solid with air so that the elemental sulfur floats and the amorphous iron oxide hydroxide precipitates.

Abstract: Methods for regenerating amorphous iron oxide hydroxide after being used as desulfurizer by (1) grinding a waste mixture into waste powder, wherein the waste mixture results from use of the composition comprising amorphous iron oxide hydroxide as desulfurizer; (2) preparing the waste powder into a suspension and charging the suspension with a gas containing oxygen to obtain a slurry comprising amorphous iron oxide hydroxide and elemental sulfur; and (3) placing the slurry or a solid resulting from filtering the slurry into a container and charging the slurry or the solid with air so that the elemental sulfur floats and the amorphous iron oxide hydroxide precipitates.

Abstract: The present invention discloses a composition for a desulfurizer with a high sulfur capacity and a process for making the same. The composition comprises the active components of three kinds of iron oxides and is used in the desulfurizer to remove hydrogen sulfide from the gaseous and liquid state feed stocks. The process for preparing the composition comprises the following steps: (1) mixing a solid ferrous compound with a solid hydroxide at a molar ratio of iron to hydroxyl being 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 in the step (3); (5) naturally drying or baking the solids obtained in step (4) to form a composition for a desulfurizer with a high sulfur capacity.

Abstract: The present invention discloses a composition for a desulfurizer with a high sulfur capacity and a process for making the same. The composition comprises the active components of three kinds of iron oxides and is used in the desulfurizer to remove hydrogen sulfide from the gaseous and liquid state feed stocks. The above-mentioned composition comprises cubic ferroferric oxide in the form of crystalline phase (Fe3O4), amorphous ferric oxide (Fe2O3) and amorphous ferric oxide monohydrate (Fe2O3.H2O). The composition has a sulfur capacity of at least 40%.