CN103754823A - Reaction-extraction coupling method for extracting molecular bromine or iodine - Google Patents
Reaction-extraction coupling method for extracting molecular bromine or iodine Download PDFInfo
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- CN103754823A CN103754823A CN201410008506.7A CN201410008506A CN103754823A CN 103754823 A CN103754823 A CN 103754823A CN 201410008506 A CN201410008506 A CN 201410008506A CN 103754823 A CN103754823 A CN 103754823A
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Abstract
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
The invention belongs to technical field of chemistry and chemical engineering, be specifically related to a kind of coupling of reaction and extraction method of extracting bromine simple substance or elemental iodine from the aqueous solution of bromide anion, iodide ion.
Technical background
From the aqueous solution that contains bromide anion or iodide ion, extracting bromine simple substance or elemental iodine is the important method of obtaining bromine, iodine resource.The main process of industrial production bromine simple substance or elemental iodine is by pass into chlorine in concentrate seawater, salt lake brine or other industrial raw material and waste water, utilize the oxygenizement of chlorine that the bromine or iodine wherein existing with ionic species is oxidized into bromine simple substance or elemental iodine, then be isolated from the aqueous solution of bromine, elemental iodine through steam or air air lift.Because bromide anion in stock liquid or iodide ion exist mainly with the form of dilute solution, the enrichment process energy consumption of bromine simple substance or elemental iodine is high, process is complicated, due to the severe corrosive of chlorine, bromine, iodine element, enrichment process is very high for stopping property, erosion resistance and the security requirement of equipment simultaneously.By solvent extration from the aqueous solution of brominated elemental iodine by after bromine, iodine element enrichment again the method by rectifying obtain the method that bromine elemental iodine is potential high efficiency extraction bromine iodine element.Solvent extration is with respect to the advantage of the method for steam or warm air air lift, by solvent extraction process, can be concentrated and be convenient to subsequent disposal the solution of bromine simple substance or elemental iodine, simultaneously lower service temperature and first enrichment more separate feature be also conducive to the energy consumption of the process that reduces; But the inferior position of this process is that flow process is long, complicated operation, is not also widely used at present in Industrial processes.The process that oxidizing reaction and extracting and enriching are coupled is very important for enhancing productivity, reduce production costs, reduce operation steps, and the gordian technique that realizes the coupling of reaction and extraction that bromine, iodine extracted is the selection of extraction agent and the formulation of extractive reaction processing condition.
Summary of the invention
The object of the present invention is to provide a kind of for extracting the coupling of reaction and extraction method of bromine simple substance or elemental iodine.
To achieve these goals, technical scheme of the present invention is as follows:
The extraction agent of demand of the present invention should be difficult for and highly active chlorine molecular reaction, simultaneously for bromine, elemental iodine, has again higher enrichment times, and the extraction agent that can meet these conditions only has alkane and halogenated alkane after screening.
In addition, the formulation of extractive reaction processing condition has determined process efficiency and energy consumption, and according to thermodynamics ultimate principle, high temperature is conducive to improve speed of reaction and improves simultaneously the enrichment degree of bromine iodine, but high temperature brings higher energy consumption, therefore in actually operating, need to consider production efficiency and energy consumption.
Based on above principle, the present invention proposes a kind of for extracting the coupling of reaction and extraction method of bromine simple substance or elemental iodine, by the collocation of extraction agent and reaction, extraction technique realized bromine, elemental iodine efficiently, extract cheaply, be conducive to advance the Industrialization of solvent extration.This coupling process specifically comprises the steps: that by chlorine leach, in extraction agent, this extraction agent is alkane or halogenated alkane; Then the molten extraction agent that contains chlorine is even with more than one the aqueous solution that contains bromide anion, iodide ion, carry out the oxidizing reaction of bromine, iodide ion, after reaction finishes, through being separated, obtain the extraction solution that contains bromine simple substance or elemental iodine, after being processed, obtain bromine simple substance or elemental iodine.
Above-mentioned extraction agent is hexane, heptane, octane, methylene dichloride, trichloromethane, tetracol phenixin or ethylene dichloride.
By chlorine leach, in extraction agent, in extraction agent, the concentration of chlorine is 0.3mmol/L～0.3mol/L.
In the above-mentioned aqueous solution, the total concn of bromide anion and iodide ion is 0.1mmol/L～0.8mol/L.
If contain bromide anion in the above-mentioned aqueous solution, its concentration is 0.1mmol/L～0.6mol/L; If contain iodide ion in the above-mentioned aqueous solution, its concentration is 1.0mmol/L～0.8mol/L.
The temperature of above-mentioned oxidizing reaction is 10 ℃～60 ℃.
Beneficial effect of the present invention is: the present invention has simplified operating process by coupling of reaction and extraction, reduced process cost, select alkane and halogenated alkane as extraction agent, to guarantee the stability of extraction agent, it is difficult for by chlorine oxidation, and by using extraction process to concentrate bromine simple substance and elemental iodine, the yield of bromine simple substance and elemental iodine can reach more than 90%, is conducive to advance extraction process to extract the industrialization of bromine iodine process.Industrial can be applicable to from extract bromine, iodine element through the industrial raw material of the seawater of concentrate, salt lake brine or brominated, iodine element and waste water.
Embodiment
Below in conjunction with specific examples, describe the present invention in detail, but protection domain not thereby limiting the invention.
Embodiment 1
Of the present invention for extracting the coupling of reaction and extraction method of bromine simple substance or elemental iodine, in specific implementation process, extraction agent is selected respectively alkane, haloalkane hexane, heptane, octane, methylene dichloride, trichloromethane, tetracol phenixin, the ethylene dichloride in listening; The aqueous solution that contains bromide anion, iodide ion is selected the mixing solutions of aqueous sodium bromide, potassium iodide aqueous solution, Potassium Bromide and potassiumiodide.In extraction agent, dissolve in the chlorine that meets stoichiometric ratio with bromine, iodide ion, again extraction agent is mixed with the above-mentioned aqueous solution, fully after reaction, standing phase-splitting, the quality of bromine simple substance or elemental iodine in measurement extraction agent, computation process yield, quality × 100% of bromide anion, iodide ion in the quality/initial aqueous solution of bromine simple substance, elemental iodine in yield (%)=extraction solution.
Result of implementation is as follows:
Claims (6)
1. for extracting a coupling of reaction and extraction method for bromine simple substance or elemental iodine, it is characterized in that, concrete grammar comprises the steps: chlorine leach in extraction agent, and this extraction agent is alkane or halogenated alkane; Then the molten extraction agent that contains chlorine is even with more than one the aqueous solution that contains bromide anion, iodide ion, carry out the oxidizing reaction of bromine, iodide ion, the extraction solution that obtains being rich in product after reaction finishes through being separated, obtains bromine simple substance or elemental iodine after being processed.
2. coupling of reaction and extraction method according to claim 1, is characterized in that, described extraction agent is hexane, heptane, octane, methylene dichloride, trichloromethane, tetracol phenixin or ethylene dichloride.
3. coupling of reaction and extraction method according to claim 1, is characterized in that, described in contain chlorine extraction agent in the volumetric molar concentration of chlorine molecule be 0.3mmol/L～0.3mol/L.
4. coupling of reaction and extraction method according to claim 1, is characterized in that, in the described aqueous solution, the total concn of bromide anion and iodide ion is 0.1mmol/L～0.8mol/L.
5. coupling of reaction and extraction method according to claim 1, is characterized in that, if contain bromide anion in the described aqueous solution, its concentration is 0.1mmol/L～0.6mol/L; If contain iodide ion in the described aqueous solution, its concentration is 1.0mmol/L～0.8mol/L.
6. coupling of reaction and extraction method according to claim 1, is characterized in that, the temperature of described oxidizing reaction is 10 ℃～60 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410008506.7A CN103754823A (en) | 2014-01-08 | 2014-01-08 | Reaction-extraction coupling method for extracting molecular bromine or iodine |
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| CN201410008506.7A CN103754823A (en) | 2014-01-08 | 2014-01-08 | Reaction-extraction coupling method for extracting molecular bromine or iodine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104250040A (en) * | 2014-06-05 | 2014-12-31 | 浙江南化防腐设备有限公司 | Concentrated seawater bromine extraction and closed-loop air stripping system and method |
| CN115676778A (en) * | 2022-11-24 | 2023-02-03 | 中船(邯郸)派瑞特种气体股份有限公司 | Method for preparing iodine chloride by using iodine waste liquid |
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| CN103395747A (en) * | 2013-08-05 | 2013-11-20 | 贵州开磷（集团）有限责任公司 | Method for simultaneously recovering iodine in iodine-containing fluosilicic acid and iodine-containing dilute phosphoric acid |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104250040A (en) * | 2014-06-05 | 2014-12-31 | 浙江南化防腐设备有限公司 | Concentrated seawater bromine extraction and closed-loop air stripping system and method |
| CN104250040B (en) * | 2014-06-05 | 2016-08-24 | 浙江南化防腐设备有限公司 | A kind of concentrated seawater puies forward bromine closed loop blow-removing system and method |
| CN115676778A (en) * | 2022-11-24 | 2023-02-03 | 中船(邯郸)派瑞特种气体股份有限公司 | Method for preparing iodine chloride by using iodine waste liquid |
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