Reaction-extraction coupling method for extracting molecular bromine or iodine
A technology of simple iodine and bromine, applied in the directions of iodine, iodine/hydrogen iodide, bromine/hydrogen bromide, etc., can solve the problems of long process, complicated operation, low operating temperature and energy consumption, and achieves simplified operation process, The effect of reducing process cost and ensuring stability
Inactive Publication Date: 2014-04-30
TSINGHUA UNIV
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The advantage of the solvent extraction method over steam or hot air stripping is that the solution of elemental bromine or iodine can be concentrated through the solvent extraction process for subsequent processing, and at the same time, the lower operating temperature and the characteristics of first enrichment and then separation are also It is beneficial to reduce the energy consumption of the process; but the disadvantage of this process is that the process is long and the operation is complicated, and it has not been widely used in industrial production processes at present
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Embodiment 1
[0016] In the reaction extraction coupling method for extracting elemental bromine or iodine of the present invention, in the specific implementation process, the extractant is selected from hexane, heptane, octane, dichloromethane, trichloromethane, Carbon tetrachloride, dichloroethane; the aqueous solution containing bromide ion and iodide ion selects sodium bromide aqueous solution, potassium iodide aqueous solution, and a mixed solution of potassium bromide and potassium iodide. Dissolve chlorine gas that satisfies the stoichiometric ratio with bromine and iodide ions into the extractant, then mix the extractant with the above-mentioned aqueous solution, after fully reacting, stand to separate phases, measure the mass of bromine or iodine in the extractant, and calculate Process yield, yield (%) = mass of bromine and iodine in the extraction solution / mass of bromide and iodide in the initial aqueous solution × 100%.
[0017] The implementation results are as follows:
[0...
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The invention discloses a reaction-extraction coupling method for extracting molecular bromine or iodine belonging to the technical fields of chemistry and chemical engineering. The method comprises the following concrete implementation processes; firstly, dissolving an oxidant chlorine into alkane or a halogenated hydrocarbon extraction agent, and then mixing the extraction agent dissolved with chlorine and the water solution containing bromine ions or iodine ions; fully carrying out oxidation reaction on the bromine ions or iodine ions; finally, carrying out phase separation to obtain an extraction solution containing the molecular bromine or iodine. The method has the characteristics that oxidation reaction of the bromine ions or iodine ions is coupled to the extraction technology of the molecular bromine or iodine, so that the operation flow is reduced, energy consumption in the process is reduced, subsequent separation and utilization of a high-concentration bromine or iodine organic solution are facilitated, and the reaction-extraction coupling method can be applied to concentrated seawater and salt lake brine or industrial raw materials and wastewater containing bromine and iodine elements to extract the bromine and iodine elements.
Description
technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a reaction extraction coupling method for extracting elemental bromine or iodine from an aqueous solution of bromide ions and iodide ions. technical background [0002] Extracting elemental bromine or iodine from an aqueous solution containing bromide or iodide is an important method for obtaining bromine and iodine resources. The main process of producing bromine or iodine in industry is to pass chlorine gas into concentrated seawater, salt lake brine or other industrial raw materials and wastewater, and use the oxidation of chlorine to oxidize bromine or iodine in the form of ions into bromine or iodine element, and then separate it from the aqueous solution of bromine and iodine element by steam or air stripping. Since bromide or iodide ions mostly exist in the form of dilute solution in the raw material solution, the enrichment process ...
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IPC IPC(8): C01B7/09C01B7/14
Inventor 骆广生王凯赵方吕阳成
Owner TSINGHUA UNIV