Method for recovering iodine from wastewater in medicine production

A technology for producing waste water and a recovery method, applied in the directions of iodine, iodine/hydrogen iodide, etc., can solve the problems of complex process, high energy consumption and production cost, and achieve the effects of low cost, high recovery rate and easy operation

Inactive Publication Date: 2016-03-30
ZHEJIANG HAIZHOU PHARMA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] It can be seen that the above-mentioned various iodine recovery technologies are either suitable for treating iodine-containing waste liquid in a single form, or the process is complicated, and the energy consumption and production cost are high. Therefore, it is economical, easy to operate, high in yield and low in cost. It is necessary to effectively iodine in pharmaceutical production wastewater and to reduce COD in wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Take 500g of pharmaceutical production waste liquid, containing 1.2% iodine (mass content, the same as in other embodiments), COD content 45000mg / L, adjust pH=2, add 1.5g of zinc powder, stir for 10 minutes, add composite oxidant C / Fe 2+ 0.5g (obtained by the mixing ratio of activated carbon 0.1g and ferrous chloride 0.4g), stirred for 5 minutes; continuous and slowly dripping hydrogen peroxide, while heating and bubbling with steam, the purple smoke formed by iodine element overflows slowly, continue to pass Enter the water vapor to heat and bubble until no purple smoke overflows. The purple smoke is passed into the absorption container and absorbed by a reducing absorption liquid (sulfurous acid solution prepared by passing sulfur dioxide gas into water); the absorption liquid is oxidized with hydrogen peroxide to no Iodine was precipitated, and 6.2 g of crude iodine was obtained by suction filtration.

[0036] After testing, the purity of crude iodine was 94.3%, the t...

Embodiment 2

[0038] Take 1000g of pharmaceutical production waste liquid, containing 3.7% iodine and 75000mg / L COD content, adjust pH=2, add 4g sodium sulfite, stir for 10 minutes, add compound oxidant C / Fe 2+ 2g (obtained by mixing 0.5g of activated carbon and 1.5g of ferrous sulfate), stir for 5 minutes; continuously and slowly add hydrogen peroxide dropwise, add steam for heating and bubbling at the same time, the iodine elemental purple smoke slowly overflows, continue to heat until there is no purple smoke Until it overflows, the purple smoke is passed into the absorption container and absorbed by a reducing absorption liquid (sulfurous acid solution prepared by dissolving sodium bisulfite in water); the absorption liquid is oxidized with hydrogen peroxide until no iodine is precipitated, and 38g of crude iodine is obtained by suction filtration .

[0039] After testing, the purity of crude iodine was 95.6%, the total recovery rate of iodine was 98.2%, the COD content of the treated w...

Embodiment 3

[0041] Take 2000g of pharmaceutical production waste liquid, containing 10% iodine and 100000mg / L COD content, adjust pH=2, add 10g of the mixture of iron powder and zinc powder mixed in any ratio, stir for 10 minutes, add composite oxidant Fe / Fe 3+ 8g (obtained by mixing 2g of iron powder and 6g of ferric sulfate), stir for 5 minutes; add hydrogen peroxide dropwise, add water vapor to heat and bubbling at the same time, the iodine element purple smoke slowly overflows, continue to heat until no purple smoke overflows, purple The smoke is passed into the absorption container and absorbed with a reducing absorption solution (sodium hydrogen sulfite solution); the absorption solution is oxidized with hydrogen peroxide until no iodine is precipitated, and 210 g of crude iodine is obtained by suction filtration.

[0042] After testing, the purity of crude iodine was 92.7%, the total recovery rate of iodine was 97.33%, the COD content of the treated waste liquid was 25000 mg / L, and ...

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Abstract

The invention discloses a method for recovery iodine from wastewater in medicine production. The method comprises the following steps: acidifying the wastewater in the medicine production with an acid, then reducing inorganic iodine with a reductant, adding a composite oxidant for oxidizing organic iodine, continuously dropwise adding hydrogen peroxide to oxidize iodine negative ions, and simultaneously introducing water vapor to heat and bubble, such that elementary iodine overflows in purple haze; continuously heating till no purple haze overflows, introducing the purple haze to an absorption container, reducing the elementary iodine with a reducible absorption solution, oxidizing the absorption solution with hydrogen peroxide, and filtering and separating to obtain coarse iodine. The acid for acidifying is any one of sulfuric acid, hydrochloric acid or nitric acid; the reductant is one or any two of or a mixture of iron powder, zinc powder, sodium hydrogen sulfite, sodium sulfite or sodium thiosulfate; the composite oxidant is one of C/Fe<2+> or Fe/Fe<3+> in a mixture; the reducible absorption solution is any one of a sulphurous acid solution, a sodium hydrogen sulfite solution or a sodium sulfite solution.

Description

technical field [0001] The invention relates to a method for recovering iodine, in particular to a method for recovering iodine in pharmaceutical production wastewater. Background technique [0002] Iodine is the basic raw material for the production of pharmaceutical intermediates. Usually, a large part of iodine is used as a catalyst, hydroxyl protecting group or added in excess during the pharmaceutical production process, resulting in a large amount of I 2 , I + , IO 3 - And organic iodine, if not recycled, will cause a lot of waste and pollute the environment. [0003] At present, the recovery methods about iodine mainly contain: [0004] 1) Oxidation method: iodide ion is oxidized to free iodine by oxidant or electro-oxidation method, and then separated. Commonly used oxidants include hypochlorite, chlorate, ferric salt, nitrite, and hydrogen peroxide. (such as CN101041422A, CN1147348C, US2385483, US1881487, US2090866, CN85107208B, etc.). [0005] Said method is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/14
CPCC01B7/14C01P2006/80
Inventor 石国兴王必伟周晶晶
Owner ZHEJIANG HAIZHOU PHARMA CO LTD
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