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Method for extracting iodine from iodine enriched solution

An iodine solution and a technology for extracting iodine, applied in the field of iodine extraction, to achieve the effects of short processing cycle, high economic and social benefits, and low investment

Active Publication Date: 2011-01-26
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of elemental iodine from enriched iodine-containing solution belongs to the reaction crystallization process, the reaction rate is slow, and the traditional process generally requires more than one week of processing time. The resulting crystals are small, irregular in appearance, easy to entrain water and impurities, and difficult to filter and separate. The iodine content of the resulting product is only about 70%, and the recovery rate is only about 80%.
And waste and pollution are more serious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 50L of iodine recovery solution with a concentration of 15.00g / L as raw material, add it to a three-port jacketed reactor equipped with a stirring device and a condensing device, turn on the stirring device and the condensing system switch, and feed in constant temperature circulating water at 25°C. Adjust the mixer speed to 400 rpm. Add 0.075g catalyst Pd / CeO 2 -TiO 2 , adjust the peristaltic pump flow rate to 0.37ml / s and add oxidant H 2 o 2 (30%), turn off the switch of the peristaltic pump after 15 minutes, and stop adding the oxidizing agent. Keep the reaction temperature for 30min. Gradient cooling is adopted, the temperature drop range is 10°C each time, keep for 30min, drop to room temperature, turn off the stirring device and the condensing system. Suction filtration yielded 772.86 g of crude iodine.

[0014] After testing, the iodine ion content in the filtrate is 218.85ppm, and the iodine content in the crude iodine is 95.80%. The recovery rate of...

Embodiment 2

[0016] Take 50L of iodine recovery solution with a concentration of 31.70g / L as a raw material, add it to a three-port jacketed reactor equipped with a stirring device and a condensing device, turn on the stirring device and the condensing system switch, and feed 40°C constant temperature circulating water, Adjust the speed of the electric mixer to 300 rpm. Add 0.4755g of catalyst Cu-TiO, adjust the flow rate of the gas flowmeter to 112ml / s and feed the oxidant Cl 2 , After 25 minutes, close the gas flow meter. The reaction temperature was maintained for 60 min. Gradient cooling was adopted, with a temperature drop of 5°C each time, kept for 20 minutes, down to room temperature, and the stirring device and condensing system were turned off. Suction filtration yielded 1611.16 g of crude iodine.

[0017] After testing, the iodine ion content in the filtrate is 531.56ppm, the iodine content in the crude iodine is 95.26%, and the recovery rate of iodine reaches 96.68%. Process...

Embodiment 3

[0019] Take 50L of iodine recovery solution with a concentration of 34.65g / L as raw material, add it to a three-port jacketed reactor equipped with a stirring device and a condensing device, turn on the stirring device and the condensing system switch, and feed in 80°C constant temperature circulating water, Adjust the speed of the electric mixer to 600 rpm. Add 0.3465g catalyst Cu-TiO, adjust the peristaltic pump flow rate to 2.36ml / s, add oxidant KClO (20%), and turn off the peristaltic pump switch after 25min. After the oxidant was added completely, the reaction temperature was maintained for 20 min. Gradient cooling is adopted, the temperature drop rate is 15°C each time, keep for 30min, drop to room temperature, turn off the stirring device and the condensation system. Suction filtration yielded 1789.22 g of crude iodine.

[0020] After testing, the iodine ion content in the filtrate is 324.80ppm, and the iodine content in the crude iodine is 94.07%. The recovery rate ...

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PUM

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Abstract

The invention discloses a method to extract iodine from enriched iodine solution, which comprises the following steps: fetching iodine reclaiming liquid as raw material with density at 15.00g / L-50.00g / L; adding into autoclave incorporating stirring device and condensing unit; operating stirring device; heating to 25-80 deg.c; setting the rotary speed of regulating stirrer at 300-600 / min; adding into activator; making the ratio of the weight of activator and iodine in the iodine reclaiming liquid at 0.1-0.3 per mill ; adjusting the flow quantity of oxidation agent; adding into autoclave in 15-40 min with 1-1.4 double oxidation agent of iodine in the iodine reclaiming liquid; keeping the reacting temperature at 30 min; adopting gradient cooling; setting the cooling amplitude at 5-15 deg.c per time; keeping 20-30 min; cooling into indoor temperature; getting rough iodine. The invention possesses short dealing cycle and high purity.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for extracting iodine from an iodine-enriched solution. Background technique [0002] Iodine is the basic raw material for the preparation of iodide. Iodine is an essential nutrient element for the human body and plants. It is widely used in medicine, agriculture, dyes, metallurgy, synthetic rubber, national defense and cutting-edge technology. At present, it is more common to extract iodine from seawater, but the iodine content in seawater is only 0.05mg / L. The industry mainly uses the iodine contained in the solution of soaking and cleaning the kelp during the production of alginate and kelp food as a by-product to produce iodine. Usually, the process of producing iodine mainly adopts adding an oxidizing agent into the iodine-containing solution, blowing out the elemental iodine from the hot air, and then using a reducing agent to absorb and enrich it int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/14B01J23/72B01J23/63
Inventor 解田段永华田言胡宏张群王景峰柳玉松
Owner WENGFU (GRP) CO LTD
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