Electrodialyser Sodium Carbonate Production Process
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Solution Overview
Problem
Current processes for producing sodium carbonate and sodium bicarbonate from ore minerals like trona are energy-intensive, particularly due to the calcination step in the monohydrate process, and the production of sodium bicarbonate is costly due to the reliance on carbonation of sodium carbonate.
Innovation Solution
A process using an electrodialyser with alternating less basic and more basic compartments separated by cationic and bipolar membranes, where sodium hydroxide is produced and used to react with sodium bicarbonate in the mineral ore, allowing for efficient extraction of sodium carbonate and bicarbonate, with optional evaporation and debicarbonation steps to enhance product separation and concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the monohydrate process with calcination is used to produce sodium carbonate from trona ore, then high purity sodium carbonate can be obtained, but energy consumption increases significantly
Solution Approach 1:
The invention changes the chemical parameters of the leaching solution by using a carbonate buffer system (maintaining pH between 8.5-10.5) instead of traditional calcination conditions. This parameter change allows selective dissolution of sodium sesquicarbonate while leaving impurities intact, achieving high purity product without high energy consumption calcination
Solution Approach 2:
The invention replaces the thermal-mechanical calcination process with a chemical-electrical process. Instead of using high temperature and mechanical grinding to convert trona to soda ash, the patent uses electrodialysis and controlled chemical leaching, substituting thermal energy with electrical energy and chemical reactions
2Quantity of substance
If traditional carbonation of sodium carbonate is used to produce sodium bicarbonate, then sodium bicarbonate can be obtained, but production cost increases
Solution Approach 1:
The invention enables the system to produce its own reagents in-situ. The electrodialysis unit generates sodium carbonate from the leaching solution, which then serves as both a product and a reagent for bicarbonate production. This self-service approach eliminates the need to purchase external sodium carbonate, reducing production costs
Solution Approach 2:
The invention merges the sodium carbonate production and sodium bicarbonate production processes into a single integrated system. The electrodialysis unit that produces sodium carbonate is directly connected to the bicarbonate crystallization process, allowing the two operations to share infrastructure and reagents, thereby reducing overall production costs
3Use of energy by moving object
If electrodialytic methods are used to reduce energy consumption in sodium carbonate production from trona, then energy consumption decreases, but the process becomes complex and difficult to implement
Solution Approach 1:
The invention segments the overall process into distinct functional units: an electrodialysis unit for sodium carbonate production, a leaching unit for impurity removal, and a crystallization unit for product formation. This segmentation allows each unit to be optimized independently and simplifies the overall process control compared to integrated complex systems
Solution Approach 2:
The invention introduces a carbonate buffer system as an intermediary that mediates between the electrodialysis process and the leaching process. This buffer system (using sodium carbonate and sodium bicarbonate in controlled ratios) stabilizes the pH and facilitates the selective dissolution of trona, simplifying the interaction between different process units
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 reduces energy consumption and production costs by facilitating the extraction of sodium carbonate and bicarbonate with improved efficiency, enabling the use of subterranean mineral deposits and scalable industrial application.
Implementation Method 1
an electrodialyser comprising alternating less basic and more basic adjacent compartments separated from each other by cationic membranes
Implementation Method 2
by combination of the flux of sodium ions crossing the cationic membrane and the flux of hydroxyl ions crossing the anionic face of the bipolar membranes
Implementation Method 3
the reaction solution is put into contact with the mineral ore comprising sodium bicarbonate in order to form a solution comprising sodium carbonate
Data Source
AI summary
Process for producing sodium carbonate and/or sodium bicarbonate from an ore mineral comprising sodium bicarbonate Process to produce sodium carbonate and/ or sodium bicarbonate from an ore mineral comprising sodium bicarbonate according to which : a production solution comprising sodium carbonate is introduced into the less basic compartments of an electrodialys er comprising alternating less basic and more basic adjacent compartments separated from each other by cationic membranes, the more basic compartments being delimited by the anionic faces of bipolar membranes on one side and by the cationic membranes on the other side; a solution comprising sodium hydroxide is produced into the more basic compartments, by combination of the flux of sodium ions crossing the cationic membrane and the flux of hydroxyl ions crossing the anionic face of the bipolar membranes; the solution comprising sodium hydroxide is extracted from the more basic compartments of the electrodialyser and used to constitute a reaction solution; the reaction solution is put into contact with the mineral ore comprising sodium bicarbonate in order to form a solution comprising sodium carbonate; the solution comprising sodium carbonate is divided into a part which is used to constitute the production solution and a remaining part which constitutes a produced solution.