An aqueous solution of sodium chloride is electrolyzed in a cell (1) with an ion permselective membrane to produce, on the one hand, chlorine (16) which is converted in a chlorine production unit (6) and, on the other, an aqueous sodium hydroxide solution (19), which is carbonated using a flue gas (
An aqueous solution of sodium chloride is electrolyzed in a cell (1) with an ion permselective membrane to produce, on the one hand, chlorine (16) which is converted in a chlorine production unit (6) and, on the other, an aqueous sodium hydroxide solution (19), which is carbonated using a flue gas (13) from an electricity and steam cogeneration unit (5), and the resulting carbonated solution (18) is evaporated to produce sodium carbonate crystals (21).
대표청구항▼
The invention claimed is: 1. An integrated process for the joint production of sodium carbonate and a chlorine derivative according to which an aqueous sodium chloride solution is electrolysed in a cell with an ion permselective membrane in order to produce, on the one hand, chlorine which is conve
The invention claimed is: 1. An integrated process for the joint production of sodium carbonate and a chlorine derivative according to which an aqueous sodium chloride solution is electrolysed in a cell with an ion permselective membrane in order to produce, on the one hand, chlorine which is converted in a chlorine derivative production unit and, on the other, an aqueous solution comprising sodium hydroxide, the aqueous solution comprising sodium hydroxide is carbonated, the resulting carbonated aqueous solution is evaporated to produce sodium carbonate crystals, which are separated, and a mother liquor, characterized in that the carbonation is carried out, at least partly, using carbon dioxide present in a flue gas issuing from a cogeneration unit supplying the integrated process with electricity and/or with steam, wherein at least a part of a steam produced in a cogeneration unit is used to evaporate the carbonated aqueous solution. 2. The process according to claim 1, wherein the aqueous sodium carbonate solution is evaporated in an evaporator-crystallizer selected from multistage evaporators and mechanical vapour recompression evaporators. 3. The process according to claim 1, wherein at least a part of a steam produced in the cogeneration unit is used in the chlorine derivative production unit for producing the chlorine derivative. 4. The process according to claim 1, wherein the carbonation is carried out by direct contact between the flue gas and the aqueous solution comprising sodium hydroxide, under conditions that cause the conversion of the aqueous solution to an aqueous slurry of crystals of a sodium carbonate. 5. The process according to claim 4, wherein the direct contacting of the flue gas with the aqueous sodium hydroxide solution is effected by circulating the said solution in countercurrent flow to the flue gas in a tower consisting of the stack of at least two superposed segments separated by a partition perforated with at least two openings, the segments comprising at least one transverse wall for causing convection of the suspension in the said segment. 6. The process according to claim 1, wherein the aqueous solution comprising sodium hydroxide is essentially free of (bi)carbonate ions when directly contacted with the carbon dioxide. 7. The process according to claim 1, wherein the electrolysis is regulated so that the aqueous sodium hydroxide solution comprises about 32% by weight of sodium hydroxide, and the operating conditions of the carbonation are regulated so that the carbonated aqueous solution contains crystals of sodium carbonate monohydrate. 8. The process according to claim 1, wherein the aqueous sodium carbonate solution is evaporated in an evaporator-crystallizer, the operating conditions of which are regulated so that the sodium carbonate crystals resulting from evaporation are crystals of sodium carbonate monohydrate. 9. The process according to claim 1, wherein the chlorine derivative is selected from the group consisting of vinyl chloride, vinylidene chloride, polyvinyl chloride and polyvinylidene chloride. 10. The process according to claim 1, wherein the electrolysis is regulated so that the aqueous sodium hydroxide solution contains 25 to 40% by weight of sodium hydroxide. 11. The process according to claim 1, wherein the carbonation and evaporation conditions are regulated to crystallize sodium carbonate monohydrate. 12. The process according to claim 1, wherein the aqueous sodium hydroxide solution is carbonated at a temperature above 35° C. and lower than 107.5° C. 13. The process according to claim 1, wherein the aqueous sodium hydroxide solution is carbonated at a temperature above 75° C. and lower than 85° C. 14. The process according to claim 1, wherein the electrolysis is regulated so that the aqueous sodium hydroxide solution contains 30 to 35% by weight of sodium hydroxide. 15. The process according to claim 1, wherein the electrolysis is regulated so that the aqueous sodium hydroxide solution contains 25 to 40% by weight of sodium hydroxide, the carbonation and evaporation conditions are regulated to crystallize sodium carbonate monohydrate, and the aqueous sodium hydroxide solution is carbonated at a temperature above 35° C. and lower than 107.5° C.
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이 특허에 인용된 특허 (1)
Gelb Alan (Boston MA), Process for generating chlorine and caustic soda using a membrane electrolysis cell coupled to a membrane alkaline fuel.
Gilliam, Ryan J.; Decker, Valentin; Boggs, Bryan; Jalani, Nikhil; Albrecht, Thomas A.; Smith, Matt, Low-voltage alkaline production using hydrogen and electrocatalytic electrodes.
Gilliam, Ryan J; Decker, Valentin; Boggs, Bryan; Jalani, Nikhil; Albrecht, Thomas A; Smith, Matt, Low-voltage alkaline production using hydrogen and electrocatalytic electrodes.
Constantz, Brent; Monteiro, Paulo J. M.; Omelon, Sidney; Fernandez, Miguel; Farsad, Kasra; Geramita, Katharine; Yaccato, Karin, Methods and systems for utilizing waste sources of metal oxides.
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