The present application pertains to processes producing oxides using a weak acid intermediate. In one embodiment a material comprising calcium carbonate is reacted with a solution comprising aqueous carboxylic acid to form a gas comprising carbon dioxide and a solution comprising aqueous calcium carboxylate. The solution comprising aqueous calcium carboxylate is reacted with sodium sulfate to form a solution comprising aqueous sodium carboxylate and a solid comprising calcium sulfate. The solution comprising aqueous sodium carboxylate is reacted with sulfur dioxide to form sodium sulfite and an aqueous carboxylic acid. The sodium sulfite is separated from said aqueous carboxylic acid and reacted to form a solid comprising calcium sulfite which is decomposed to form calcium oxide and sulfur dioxide.

A particulate, heterogeneous solid CO.sub.2 absorbent composition, comprising decomposition products of Ca.sub.3Al.sub.2O.sub.6 after having been heated to a temperature between 500 C. and 925 C. in the presence of H.sub.2O and CO.sub.2 for a period of time sufficient to allow the Ca.sub.3Al.sub.2O.sub.6 to react and form the particulate, heterogeneous absorbent composition which exhibits a higher concentration of aluminum than calcium in the particle core but a higher concentration of calcium than aluminum at the particle surface. The invention also comprises a method for preparing the particulate, heterogeneous product as well as a method for utilizing the composition for separating CO.sub.2 from a process gas.

A particulate, heterogeneous solid CO.sub.2 absorbent composition, comprising decomposition products of Ca.sub.3Al.sub.2O.sub.6 after having been heated to a temperature between 500 C. and 925 C. in the presence of H.sub.2O and CO.sub.2 for a period of time sufficient to allow the Ca.sub.3Al.sub.2O.sub.6 to react and form the particulate, heterogeneous absorbent composition which exhibits a higher concentration of aluminum than calcium in the particle core but a higher concentration of calcium than aluminum at the particle surface. The invention also comprises a method for preparing the particulate, heterogeneous product as well as a method for utilizing the composition for separating CO.sub.2 from a process gas.

The invention relates to acid neutralizer technology, specifically involving a pure nano calcium powder and its preparation method, the nano calcium powder purity include the weight of the raw material: 3-7 parts pearl, 8-12 parts mother of pearl, 2-3 parts red coral, 20-30 parts oyster shell, clam shell 35-55 parts, Giant Clam 5-10 parts, pangolin shell 1-3 and 1-7 parts ore defined as limestone, cold water stone, and goose pipe rock. The preparation methods include cleaning, primary grinding, heat decomposition, rules grinding, nano grinding and mixing. Nano calcium pure powder of the present invention relates to the specific natural raw materials, and strict control of the nano calcium powder purity can provide human body absorption rates over 99%. The preparation method of the invention process is simple, convenient operation and control, stable quality, high yield, can be large-scale industrial production.

The invention relates to acid neutralizer technology, specifically involving a pure nano calcium powder and its preparation method, the nano calcium powder purity include the weight of the raw material: 3-7 parts pearl, 8-12 parts mother of pearl, 2-3 parts red coral, 20-30 parts oyster shell, clam shell 35-55 parts, Giant Clam 5-10 parts, pangolin shell 1-3 and 1-7 parts ore defined as limestone, cold water stone, and goose pipe rock. The preparation methods include cleaning, primary grinding, heat decomposition, rules grinding, nano grinding and mixing. Nano calcium pure powder of the present invention relates to the specific natural raw materials, and strict control of the nano calcium powder purity can provide human body absorption rates over 99%. The preparation method of the invention process is simple, convenient operation and control, stable quality, high yield, can be large-scale industrial production.

In some embodiments the application pertains to processes comprising reacting a component comprising an alkaline earth weak acid with a component comprising an acid to form a component comprising an alkaline earth acid anion and a component comprising a weak acid derivative. At least a portion of the component comprising the alkaline earth acid anion is reacted with a component comprising an alkali sulfate to form a component comprising alkaline earth sulfate and a component comprising an alkali acid anion. At least a portion of the component comprising alkaline earth sulfate is decomposed to form a component comprising alkaline earth oxide, or alkaline earth hydroxide, or alkaline earth carbonate, or alkaline earth sulfide, or a derivative thereof, or any combination thereof, and a component comprising sulfur dioxide, or oxygen, or sulfur trioxide, or a derivative thereof, or any combination thereof.

In some embodiments the application pertains to processes comprising reacting a component comprising an alkaline earth weak acid with a component comprising an acid to form a component comprising an alkaline earth acid anion and a component comprising a weak acid derivative. At least a portion of the component comprising the alkaline earth acid anion is reacted with a component comprising an alkali sulfate to form a component comprising alkaline earth sulfate and a component comprising an alkali acid anion. At least a portion of the component comprising alkaline earth sulfate is decomposed to form a component comprising alkaline earth oxide, or alkaline earth hydroxide, or alkaline earth carbonate, or alkaline earth sulfide, or a derivative thereof, or any combination thereof, and a component comprising sulfur dioxide, or oxygen, or sulfur trioxide, or a derivative thereof, or any combination thereof.

In some embodiments the application pertains to processes comprising reacting a component comprising an alkaline earth weak acid with a component comprising an acid to form a component comprising an alkaline earth acid anion and a component comprising a weak acid derivative. At least a portion of the component comprising the alkaline earth acid anion is reacted with a component comprising an alkali sulfate to form a component comprising alkaline earth sulfate and a component comprising an alkali acid anion. At least a portion of the component comprising alkaline earth sulfate is decomposed to form a component comprising alkaline earth oxide, or alkaline earth hydroxide, or alkaline earth carbonate, or alkaline earth sulfide, or a derivative thereof, or any combination thereof, and a component comprising sulfur dioxide, or oxygen, or sulfur trioxide, or a derivative thereof, or any combination thereof.

In some embodiments the application pertains to processes comprising reacting a component comprising an alkaline earth weak acid with a component comprising an acid to form a component comprising an alkaline earth acid anion and a component comprising a weak acid derivative. At least a portion of the component comprising the alkaline earth acid anion is reacted with a component comprising an alkali sulfate to form a component comprising alkaline earth sulfate and a component comprising an alkali acid anion. At least a portion of the component comprising alkaline earth sulfate is decomposed to form a component comprising alkaline earth oxide, or alkaline earth hydroxide, or alkaline earth carbonate, or alkaline earth sulfide, or a derivative thereof, or any combination thereof, and a component comprising sulfur dioxide, or oxygen, or sulfur trioxide, or a derivative thereof, or any combination thereof.