Method of iodine extraction from confined groundwater

FIELD: oil and gas industry.

SUBSTANCE: invention can be used in gas and oil production industry for associated crude iodine production from iodine-lean confined groundwater. The method is implemented by a sequence of electrochemical iodide ion oxidation, molecular iodine sorption on carbon, electrochemical reduction of iodine to iodides, and desorption. All stages are performed in the same chemical reactor represented by a sorption column. Activated carbon with minimum iodine adsorption capacity of 1,000 mg/g is used as a sorbent. Graphite electrode at the column bottom is used as an anode, copper cathode in the form of plate at the column top is used as cathode. After the carbon is saturated with iodine, electrode polarity is reversed to desorb iodine from carbon in the form of iodide ions. Confined groundwater, including one with low iodine content, is used as iodine source.

EFFECT: enhanced iodine production efficiency.

2 cl, 1 dwg, 1 tbl, 1 ex

 

The invention relates to methods for the recovery of iodine from underground pressure water and can be used in gas and oil industry for product extraction of the iodine-sugar.

The known method of electrolytic separation of iodine and absorb it with charcoal (ed. St. USSR №40333, CL. 12i, 714, 1934. A. P. Szmuk), according to which the electrolysis occurs by anodic oxidation of iodide ions and simultaneous sorption of iodine at the anode of active carbon.

The disadvantage of this method is that the iodine from the allocated coal chemical reducing agents that make the coal unsuitable for further use, and, in addition, spent chemicals.

Closest to the invention is a method the reverse of iodine excretion with coal (ed. St. USSR №43879, CL. l2i, 714, 1935. E. N. Vinogradova). According to this method, the desorption of iodine from the charcoal is in the form of iodide ions by electrochemical recovery due to the change of polycesta during electrolysis from positive to negative.

The disadvantages of this method are the use as a sorbent of fine-grained charcoal with low adsorption capacity (80 mg/g) and iron cathode, the electrolysis in saline water forms flakes of iron hydroxide, impeding the flow of the process.

The problem to be solved by the claimed technical solution�tion, excluding the cost of chemical reagents in the process of electrochemical and sorption of iodine, the reduction of environmental load on the environment.

In the implementation of the technical solution the problem is solved at the expense of achieving a technical result, which consists in increasing the efficiency of extraction of iodine, including from low concentration of iodine-containing underground water pressure (from 10 mg/l).

Said technical result is achieved in that in the method of extracting iodine from underground artesian waters, which includes stages of the electrochemical oxidation of iodide-ions, sorption of molecular iodine on carbon, electrochemical reduction of iodine to iodide and desorption, the feature is that as a sorbent use crushed activated carbon with high strength and high adsorption capacity and a copper cathode, wherein all of the specified step is carried out in a single chemical reactor. In addition, you can use as a sorbent of coal of causor-221 with adsorption capacity for iodine 1000 mg/g, and as a raw material source the extraction of low-concentrated iodine underground pressure water.

Method involves electrochemical oxidation of iodide-ions without the use of oxidizing agents. All of the following extraction stage yo�a is carried out in a single chemical reactor which is used as the sorption column (see Fig. 1).

The essence of the invention consists in the following. During iodine by electrolysis at a constant voltage (1-2. 5 V) ground water (2) from a pressure tank (1) through the lower hole flows into the adsorption column (3), filled with intense crushed coal with high strength and high adsorption capacity (at least 1000 mg/d) (6), for example the brand of causor-221 (TU 2162-210-05795731-2006) with adsorption capacity for iodine 1000 mg/g. Column acts as a flow-through electrolytic cell. In the lower part of the column is graphite electrode (4), which together with densely sprinkled and pressed from above by a plastic grille (7) coal form one large active anode. The anode and cathode through a rectifier (8) is fed a constant current with a voltage of 1.5 V and a current of 0.2 A. the purpose of preventing precipitation of iron hydroxide and piling them intergranular space of the coal in the upper part of the column is iron instead of copper cathode in the form of a plate (5). In the anode space there is a simultaneous acidification of the solution to pH 2.4 to 2.7 and the oxidation of iodine in solution with subsequent sorption on charcoal to achieve the oxidation-reduction potential (ORP), is $ 550-590 MB. Because in this range the ORP value of the solution is full of villages�active oxidation of iodine, as bromine and chlorine under these conditions are not oxidized. After saturation of the charcoal iodine changes the polarity of the electrodes to ensure that the iodine is recovered and prodesarrollo with coal the same solution.

Diagram of the iodine-containing electrolysis of aqueous solutions with graphite anode is presented below:

From the diagram it is evident that evolved at the anode the hydrogen ions are the cause of increasing the acidity of the solution, which is a favorable condition for the electrochemical oxidation of iodine. Further, due to the interaction of hydrogen ions and hydroxyl groups at the outlet of the column the solution is neutral with a pH between 6.8 - 7.5.

The present invention avoids the cost of reagents to extract iodine from water with low content and to reduce the environmental load on the environment.

Example. Natural underground water, having the composition, g/l: sodium chloride -13,4; iodide ion is 0.01; the bromide-ion - 0.05; calcium - 0,5; magnesium - 0,13; iron. - 0,002; pH to 7.3, M (mineralization) is 14.7 served in the column flow-through cell for oxidation, sorption and desorption of iodine. Download columns charcoal - 1, Was omitted 60 l of a solution at a voltage of 1.5 V and a current of 0.2 A. On 1 g of charcoal adsorbed 600 mg of iodine. After the coal has been satiated, change polarity, with the result that the anode becomes the cathode, and the cathode - anode and iodine is desorbed from coal in the form �did ions. The recovery rate of 97%. The total power consumption of 5.7 kWh per 1 kg of iodine (considering the energy consumption for the oxidation and recovery).

The table shows the results of iodine on the proposed and known ion exchange method with the use of coal CR (Canseco V. I., Stenevik D. S. Chemistry and technology of bromine, iodine and their compounds, Moscow, Publishing house "Chemistry", 1979, p. 232).

1. Method of extracting iodine from underground pressure water, comprising the sequential steps of electrochemical oxidation of iodide-ions, sorption of molecular iodine on carbon, electrochemical reduction of iodine to iodide and desorption, characterized in that all stages is carried out in a single within the chemical reactor, which is used as the sorption column, as a sorbent use activated carbon with adsorption capacity for iodine is not less than 1000 mg/g, the anode used graphite electrode, located in the lower part of the column, as the cathode - copper cathode in the form of a plate located in the upper part of the column, and after saturation of the charcoal iodine change the polarity of the electrodes for the desorption of iodine from coal in the form of iodide ions.

2. The method for recovering iodine according to claim 1, characterized in that as a raw material source the extraction of iodine use underground mineralized head�s water including its low content.



 

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