Method for refining industrial coarse iodine

An industrial and iodine quantity technology, applied in the directions of iodine, iodine/hydrogen iodide, etc., can solve the problems of high impurity content in iodine products, difficult to industrialize production, outdated and outdated processes, etc., to improve product added value, easy industrialization, and appearance regular effect

Active Publication Date: 2008-10-01
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the product obtained by the above patents is just a slightly higher industrial crude iodine product, which cannot meet the growing demand for higher refined iodine with purity
However, the traditional refining met

Method used

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  • Method for refining industrial coarse iodine

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Experimental program
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Effect test

Embodiment 1

[0013] Take 300.21 kg of crude iodine with an iodine content of 70.18% and add it to the jacketed sublimator of concentrated sulfuric acid with 50L98% of gas blowing device installed, adjust the ambient temperature of the crystallization device to 20°C, turn on the circulation heating system switch, and Circulate heating glycerin to heat the sublimator to 60°C, adjust the gas flow meter, and pass 8.00L / min dry air through the gas distributor at the bottom of the sublimator to start sublimation of iodine into the crystallizer and keep it for 60min. Adjust the circulation heating system, raise the temperature to 160°C, adjust the gas flow meter, so that the gas flow rate is 1.20L / min into the sublimator, keep for 40min to collect the remaining iodine, then close the gas switch and the valve of the circulation heating system. Gained smart iodine in the crystallizer is 204.08kg.

[0014] After testing, the content of elemental iodine in refined iodine is 99.98%. The recovery rate...

Embodiment 2

[0016] Take 250.19 kg of crude iodine with an iodine content of 95.28% and add it to a jacketed sublimator equipped with a gas blowing device and added 50L of 98% concentrated sulfuric acid, adjust the ambient temperature of the crystallization device to 20°C, and turn on the circulation heating system switch , put in circulation to heat glycerin to heat the sublimator to 90°C, adjust the gas flow meter, and pass 10.00L / min dry N2 through the gas distributor at the bottom of the sublimator, so that iodine starts to sublimate and enter the crystallizer, keep it for 40min, and adjust the cycle Heating the system, raising the temperature to 200°C, adjusting the gas flow meter so that the gas flow rate is 1.10L / min into the sublimator, keeping for 50 minutes to collect the remaining iodine, closing the gas switch and the valve of the circulating heating system. Gained smart iodine in the crystallizer is 235.52kg.

[0017] After testing, the content of elemental iodine in refined i...

Embodiment 3

[0019] Get the crude iodine 200.38kg that iodine content is 82.41% and join in the jacket type sublimator that gas blowing device is housed and the concentrated sulfuric acid of 50L98% has been added, adjust crystallization device ambient temperature to 20 ℃, turn on the circulation heating system switch, pass Circulate heating glycerin to heat the sublimator to 100°C, adjust the gas flow meter, and pass 14.00L / min dry air through the gas distributor at the bottom of the sublimator to start sublimation of iodine into the crystallizer and keep it for 80 minutes. Adjust the circulation heating system, raise the temperature to 190°C, adjust the gas flow meter, so that the gas flow rate is 1.00L / min into the sublimator, keep for 60 minutes to collect the remaining iodine, and close the gas switch and the valve of the circulation heating system. Gained smart iodine in the crystallizer is 163.94kg.

[0020] After testing, the content of elemental iodine in refined iodine is 99.99%. ...

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Abstract

The invention relates to a method for refining industrial crude iodine. The method comprises the steps that the industrial crude iodine with the iodine content accounting for 70 to 95 percent is adopted as material to be added into a sublimator which is provided with concentrated sulfuric acid, a temperature measurement device and a gas blowing-out device; the ambient temperature of a crystallization device is controlled to be 20 DEG C, the sublimator is first heated to 60 to 90 DEG C and the sublimated iodine is caused to flow into a crystallizer by using the gas with the flow rate of 8 to 15L/min; after being maintained for 40 to 60 min, the temperature of the sublimator is heated to 160 to 200 DEG C and the gas-flow rate is adjusted to 1 to 1.5L/min so as to continue to collect the remaining iodine. By adopting the refining method, the content of volatile impurities in iodine products can be effectively reduced; multi-level crystallization devices are adopted to be connected in series to prevent the loss of the iodine and improve the working efficiency of the iodine sublimator. The obtained refined iodine products have neat appearance, large particle size and low impurity content. In addition, the refining method of the invention has the advantages of easy industrialization, low investment, high recovery rate and cleanness without pollution, etc., and can also increase the added value of the iodine products as well as generate relatively high economic and social benefits.

Description

technical field [0001] The patent of the present invention relates to a method for refining iodine, in particular to a method for preparing refined iodine from industrial crude iodine. 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. With the continuous development of science and technology, the iodine industry has developed from the original iodine industrial production using seafood as raw material to the direction of producing industrial crude i...

Claims

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Application Information

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IPC IPC(8): C01B7/14
Inventor 解田段永华田言杨丽萍张群刘飞
Owner WENGFU (GRP) CO LTD
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