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Process for recovering iodine from medical organic waste liquid containing iodine bromide

A technology of organic waste liquid and iodine bromide, which is applied in the direction of iodine, incinerator, iodine/hydrogen iodide, etc., can solve the problems of inappropriate, unobtainable iodine element, unsuitable for recovery of iodine, etc., to reduce production costs, The effect of avoiding the decomposition of sodium sulfite and reducing environmental pollution

Active Publication Date: 2020-12-04
山东博苑医药化学股份有限公司
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Iodine cannot all be changed into elemental iodine by simple reduction method or simple oxidation method, and then separated and recovered; the ion exchange method is also not suitable for recovering iodine in iodine bromide, and iodine bromide is not an ionic compound; neither is the air stripping method. Suitable, if chlorine gas is passed into the iodine bromide waste liquid, iodine chloride and bromine will be produced, and iodine element cannot be obtained
The flotation method is used to enrich a small amount of iodine, and it is also not suitable for the recovery of iodine from medical organic waste liquid containing iodine bromide.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Add an appropriate amount of iodine bromide-containing organic waste 2000Kg iodine content 8.50% in the reactor, add the same amount of water and stir for 10 minutes;

[0038] (2) prepare an appropriate amount of 20% sodium sulfite solution in another reactor;

[0039] (3) Add an appropriate amount of liquid caustic soda and the sodium sulfite solution prepared in the previous step into the reaction kettle through a metering pump, control the pH to 5-7, and keep the potential below 200mV; let it stand for stratification, and put the organic layer into the high calorific value fuel storage tank; The water layer is sprayed into an incinerator with a spray gun and burned to obtain a sodium iodide solution for removing organic matter;

[0040] (4) The sodium iodide solution is adjusted to pH≤2.0 with dilute sulfuric acid or hydrochloric acid; filter to remove insoluble matter;

[0041] (5) The filtrate is transferred to the iodine oxidation reaction kettle, the circula...

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Abstract

The invention relates to a process for recovering iodine from medical organic waste liquid containing iodine bromide. The process comprises the following steps: neutralizing a large amount of acid inthe waste liquid by using caustic soda liquid, keeping weak acidity by using the caustic soda liquid, conducting reduction by using sodium sulfite, separating out a water layer, allowing iodine to enter the water layer in the form of sodium iodide, incinerating a sodium iodide-containing water solution at a high temperature (1000-1100 DEG C) by using an incinerator to obtain an iodine-containing water solution in which organic matters are thoroughly removed, and producing iodine by using a conventional oxidation iodine production process, wherein the yield of iodine is 98% or above and the content of iodine is 96% or above. A produced organic layer is applied as a high-calorific-value fuel for the incinerator, and generated heat is used for production, so environmental pollution is reduced.

Description

technical field [0001] The invention relates to a method for recovering iodine, in particular to a process for recovering iodine from medical organic waste liquid containing iodine bromide. Background technique [0002] Iodine is a scarce resource. The by-product organic waste liquid containing iodine bromide in the process of producing pharmaceutical intermediates is strongly acidic. The organic matter is mainly n-heptane dioxane, and a large amount of impurities remain in it. It is difficult to reclaim iodine with high quality by advanced recovery methods. The recovery method of iodine in the prior art mainly contains: [0003] Oxidation method: use oxidant or electro-oxidation method to oxidize iodide ion to free iodine, and then separate. Generally, it is only suitable for the recovery of iodine in the iodine-containing anion waste liquid, and the amount of oxidizing agent must be strictly controlled, otherwise the elemental iodine will be further oxidized into high-va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/14F23G7/04
CPCC01B7/14F23G7/04
Inventor 刘会军周丽娜刘亚琪邢晓宇李成林
Owner 山东博苑医药化学股份有限公司
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