Process for extracting iodine from kelp

A technology for extracting iodine and kelp, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of large water consumption, rising production cost, long time, etc. The effect of saving energy and production time

Inactive Publication Date: 2006-10-04
威海长青海洋科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter the traditional method for extracting iodine from kelp or the "a method for extracting active iodine from kelp" disclosed in the above-mentioned patent specification, the raw materials are all dried kelp, and a large amount of water is used to soak for a long time. The raw material of kelp is used to obtain the soaking liquid, so there is a large loss of water and a long time; in addition, factors such as the lack of labor and drying yards for drying kelp (the drying of kelp needs to occupy a large amount of land) and other factors will also make it difficult to extract iodine from kelp. The cost of production has risen sharply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The fresh kelp harvested at sea is selected as the raw material, and after weighing 100 kg, it undergoes the following treatment process:

[0016] (A), soaking: chopping up 100 kilograms of fresh kelp weighed above, pumped to the soaking tank and soaking in 200 kilograms of water for 30 minutes; Apply mechanically to soak for the first time to increase the iodine and mannitol content of the soaking water;

[0017] (B), purification: the above-mentioned kelp soaking solution is placed in the floating pool, and the pH value of adding liquid caustic soda to adjust the soaking solution is 12, so that the organic colloidal impurities such as sugar gum are condensed, and the air is pumped into the air with a circulation pump simultaneously to carry out mixing After airing for 20 minutes and floating for 4 hours, the clear liquid can be released from the lower part of the floating pool;

[0018] (C), acidification and oxidation: add industrial hydrochloric acid to the clear l...

Embodiment 2

[0024] The fresh kelp harvested at sea is selected as the raw material, and after weighing 500 kg, it undergoes the following treatment process:

[0025] (A), soaking: chopping up 500 kilograms of fresh kelp weighed above, pumped to the soaking pool and soaking in 1000 kilograms of water for 50 minutes; Apply mechanically to soak for the first time to increase the iodine and mannitol content of the soaking water;

[0026] (B), purification: the above-mentioned kelp soaking solution is placed in the floating pool, and the pH value of adding liquid caustic soda to adjust the soaking solution is 12, so that organic colloidal impurities such as sugar gum are condensed; Air for 30 minutes, static floating for 6 hours, then the clear liquid can be released from the lower part of the floating pool;

[0027] (C), acidification and oxidation: add industrial hydrochloric acid to the clear liquid containing iodine and mannitol obtained above, adjust the pH value to 2, then add chlorine ...

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PUM

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Abstract

The disclosed method to extract I2 from kelp comprises: with fresh kelp as material, cutting up, adding 200wt% water to dip for 30-50min; putting soak into pond, adjusting pH value with alkali, while filling gas to stir and then filter to obtain the clear liquid with I2 and mannitol; acidifying and oxidizing to obtain dissociative I2 and then adsorb with basic anion exchange resin; desorbing the I2 on resin with Na2S2O3; adding strong H2SO4 and KClO3 to separate out coarse I2; cleaning, and refining with 25wt% strong H2SO4 at 140Deg to obtain the refined iodine. This invention reduces cost and source.

Description

technical field [0001] The invention relates to seaweed chemical technology, in particular to a method for extracting iodine from seaweed. Background technique [0002] Iodine is an element in the halogen family, which has a great impact on the survival of humans, animals and plants. It is mainly used in medicine, and is also widely used in agriculture, chemical industry, and cutting-edge defense technologies. The traditional method for extracting iodine from kelp uses sun-dried dried kelp and the following process: add 4-16 times of tap water to the dried kelp and soak for 24 hours to obtain iodine- and mannitol-containing iodine. Kelp water soaking solution, add caustic soda to the kelp water soaking solution to adjust the pH value to about 12, settling for 8 hours, obtain purified water, then add hydrochloric acid to adjust the pH value to 2, then add sodium hypochlorite and stir evenly to make it brownish red, close to oxidation When adding 5% sodium nitrite, it is comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/16
Inventor 王清印李长清冷凯良卞永平
Owner 威海长青海洋科技股份有限公司
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