Calcium Sulfate Conversion via Magnesium to Calcium Oxide, Sulfuric Acid
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Solution Overview
Problem
There is a significant need for a low-cost, low-energy, and low-CO2 emission process to convert calcium sulfate into sulfuric acid and/or calcium oxide, as existing processes emit high levels of CO2 and consume significant energy, and there is a potential shortage of sulfuric acid due to reduced sulfur production.
Innovation Solution
A process involving a double displacement or metathesis reaction between calcium sulfate and a magnesium-‘x’ anion salt, forming magnesium sulfate and calcium-‘x’ anion salts, which are then decomposed to produce calcium oxide, sulfuric acid, and other valuable products like magnesium oxide and sulfur dioxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional processes are used to convert calcium sulfate into sulfuric acid and calcium oxide, then the products are obtained, but high levels of CO2 emissions and significant energy consumption occur
Solution Approach 1:
The patent introduces magnesium compounds (magnesium sulfate, magnesium oxide, magnesium carbonate) as intermediary substances to facilitate the conversion of calcium sulfate to sulfuric acid and calcium oxide. The magnesium compounds act as mediators in the chemical reactions, enabling the transformation while reducing direct CO2 emissions and energy consumption compared to conventional direct decomposition methods
Solution Approach 2:
The patent employs parameter changes including temperature control, pH adjustment, and concentration variations to optimize the reaction conditions. By carefully controlling these parameters during the magnesium-mediated conversion process, the system achieves lower energy consumption and reduced CO2 emissions while maintaining product yield
2Object-generated harmful factors
If sulfur production is reduced due to potential future reduction in oil consumption, then environmental benefits are achieved, but sulfuric acid supply may become insufficient
Solution Approach 1:
The patent recovers sulfuric acid from calcium sulfate waste products, effectively recycling sulfur that would otherwise be discarded. This approach creates an alternative sulfuric acid production pathway that does not depend on traditional sulfur mining and processing, thereby maintaining supply while reducing environmental harm from sulfur extraction and refining
Solution Approach 2:
The patent establishes a multi-functional process that simultaneously treats calcium sulfate waste, produces sulfuric acid, and generates calcium oxide as a valuable byproduct. This universal approach addresses multiple needs (waste management, sulfuric acid production, calcium oxide supply) within a single integrated system
3Productivity
If calcium sulfate waste is accumulated in large quantities, then production volume is maintained, but storage and disposal costs increase
Solution Approach 1:
The patent converts the harmful waste substance (calcium sulfate accumulation) into beneficial products (sulfuric acid and calcium oxide). By chemically transforming the waste through magnesium-mediated reactions, the system turns a disposal problem into a value-generating process, eliminating storage costs and creating revenue streams from previously worthless waste material
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process enables the production of calcium oxide and sulfuric acid with significantly lower CO2 emissions, facilitates a circular economy by recycling sulfuric acid, and produces valuable intermediates and products, reducing energy consumption and environmental impact.
Implementation Method 1
heating the magnesium sulfate to a temperature sufficient to decompose the magnesium sulfate to sulfuric acid and magnesium oxide
Implementation Method 2
reacting the calcium sulfite with sulfur dioxide to form calcium sulfate
Implementation Method 3
A process involving a double displacement or metathesis reaction between calcium sulfate and a magnesium-‘x’ anion salt, forming magnesium sulfate and calcium-‘x’ anion salts
Data Source
AI summary
The present application pertains to processes for making calcium oxide and/or sulfuric acid from calcium sulfate. In some embodiments the processes comprise reacting a component comprising calcium sulfate with a second component comprising magnesium sulfite under conditions to form a solid comprising calcium sulfite and a solution comprising magnesium sulfate. Next, at least a portion of the solid comprising calcium sulfite is decomposed to form a second solid comprising calcium oxide, or calcium hydroxide, or cement, or clinker, or any combination thereof.