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Decoloring method for ammonium thiocyanate salt extracted from coking desulfurization waste liquid

A technology of coking desulfurization waste liquid and ammonium thiocyanate, applied in thiocyanic acid and other directions, can solve problems such as side reactions and purity reduction, and achieve the effects of eliminating environmental pollution, thorough decolorization, and reducing costs

Inactive Publication Date: 2015-04-15
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for decolorizing ammonium thiocyanate in coking desulfurization waste liquid, which is used to solve the problems in the prior art that the decolorizing agent assists activated carbon decolorization and introduces impurities, resulting in reduced purity and side reactions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Implement a kind of decolorization method of the ammonium thiocyanate salt extracted from coking desulfurization waste liquid, this decolorization method is to adopt solvent extraction method to extract 1000g of ammonium thiocyanate from desulfurization waste liquid, under normal temperature and pressure, be dissolved in 2000g distilled water 300 g of AW decolorizing agent was added, stirred for 10 min and filtered, and the filtrate was heated, evaporated and crystallized to obtain ammonium thiocyanate decolorized product. Comparison of ammonium thiocyanate before and after decolorization, from dark reddish brown before decolorization to bright white after decolorization; after being placed in dry air for 48 hours, the color did not change significantly; the aqueous solution changed from reddish brown and turbid before decolorization to clear and transparent after decolorization Slightly reddish; using the technical requirements, test methods and inspection rules stipulat...

Embodiment 2

[0039] Implement a kind of decolorization method of the ammonium thiocyanate salt extracted from coking desulfurization waste liquid, this decolorization method is to adopt solvent extraction method to extract 1000g of ammonium thiocyanate from desulfurization waste liquid, under normal temperature and pressure, be dissolved in 2000g distilled water Add 250g of AW decolorizing agent, stir for 10min and filter, heat the filtrate to evaporate and crystallize to obtain ammonium thiocyanate decolorized product. Comparison of ammonium thiocyanate before and after decolorization, from dark reddish brown before decolorization to bright white after decolorization; after being placed in dry air for 48 hours, the color did not change significantly; the aqueous solution changed from reddish brown and turbid before decolorization to clear and transparent after decolorization Slightly reddish; using the technical requirements, test methods and inspection rules stipulated in GB 660-92, the p...

Embodiment 3

[0041] Implement a kind of decolorization method of the ammonium thiocyanate salt that extracts from coking desulfurization waste liquid, this decolorization method is to adopt fractional crystallization method to extract ammonium thiocyanate 1000g from desulfurization waste liquid, under normal temperature and pressure, dissolve in 2000g Add 300 g of AW decolorizing agent to distilled water, stir for 10 minutes and filter, and heat the filtrate to evaporate and crystallize to obtain ammonium thiocyanate decolorized product. Comparison of ammonium thiocyanate before and after decolorization, from dark reddish brown before decolorization to bright white after decolorization; after being placed in dry air for 48 hours, the color did not change significantly; the aqueous solution changed from reddish brown and turbid before decolorization to clear and transparent after decolorization Slightly reddish; using the technical requirements, test methods and inspection rules stipulated i...

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PUM

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Abstract

A decoloring method for ammonium thiocyanate salt extracted from a coking desulfurization waste liquid comprises: at normal temperature and normal pressure, dissolving proper amount of ammonium thiocyanate salt extracted from the coking desulfurization waste liquid in proper amount of deionized water, adding corresponding mass of an AW decolorant, stirring and filtering, heating the filtrate, evaporating and crystallizing to obtain decolored ammonium thiocyanate salt. Compared with a physical adsorption method, the decoloring method has the advantages of through decoloring, no heating process and low energy consumption.

Description

technical field [0001] The invention relates to a method for decolorizing the extract of coking desulfurization waste liquid, more specifically, a method for decolorizing ammonium thiocyanate extracted from coking desulfurization waste liquid. Background technique [0002] During the coking process, about 30% to 35% of the sulfur in the coal is converted into sulfides such as hydrogen sulfide, and the rest of the sulfur enters the coke. Hydrogen sulfide forms impurities in gas together with ammonia and hydrogen cyanide. Their existence will not only seriously endanger people's health and corrode equipment, but also the combustion products will pollute the environment; if it is used as synthesis gas, it will also cause catalyst poisoning ; At the same time, various industrial furnaces and flame cutters also have certain requirements for the sulfur content in coke oven gas, so coke oven gas must be desulfurized and decyanidated before use. Domestic coking plants generally ado...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C3/20
Inventor 张永发陈攀李珍珍李国强田波王兆文石玉良孙亚玲
Owner TAIYUAN UNIV OF TECH
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