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Method for extracting ammonium thiocyanate from ammonia-process desulfurization waste liquid by oxidation process

An ammonia desulfurization and ammonium thiocyanate technology, applied in thiocyanic acid, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problem of expensive equipment maintenance, destruction of ammonium thiocyanate resources, and low added value. and other problems, to achieve the effect of simple and convenient component separation and simplified process flow

Inactive Publication Date: 2013-04-03
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

The oxidation efficiency of the Herohax process is very high, and useful products can be obtained, which can increase the yield of ammonium sulfate. However, this process method requires the equipment to be made of titanium alloy stainless steel corrosion-resistant materials. Due to the high cost of materials, the process construction cost is high. The maintenance cost of equipment is also expensive, so this technology has been introduced into China for nearly 30 years, but it has not been accepted by domestic coking manufacturers. Destroyed, producing a product of low value-added ammonium sulfate

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  • Method for extracting ammonium thiocyanate from ammonia-process desulfurization waste liquid by oxidation process

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Embodiment Construction

[0029] Process flow of the inventive method as figure 1 As shown, the main equipment of the process device includes an oxidizer 1 , an evaporative concentrator 5 , a first cooling crystallizer 6 , a second cooling crystallizer 8 , a first crystallizer 7 and a second crystallizer 9 . The specific implementation process of the inventive method is as follows:

[0030] The ammonia-based desulfurization waste liquid B sent from the desulfurization device is pumped into the oxidizer 1, and the amount of heating steam C is adjusted so that the temperature of the waste liquid in the container is within the range of 50-100 °C, and air or oxygen A is blown in at the same time , so that the waste liquid oxidation reaction. The amount of air or oxygen A blown in is 30 to 150 times the volume of the waste liquid, and the reaction time is controlled within the range of 60 to 120 minutes. The reaction oxidation solution is put into the precipitation separator 2 for static decantation and s...

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Abstract

The invention discloses a method for extracting ammonium thiocyanate from ammonia-process desulfurization waste liquid by an oxidation process, and belongs to the technical field of treatment of the desulfurization waste liquid. According to the method, an oxidation reaction is implemented by a way of blowing air or oxygen into ammonia-process desulfurization waste liquid; by the oxidation reaction, ammonium thiosulfate in the desulfurization waste liquid is oxidized into ammonium sulfate, but ammonium thiocyanate is not oxidized and is still reserved in the desulfurization waste liquid; and the ammonium thiocyanate is extracted by ways of evaporation and secondary crystallization. The method disclosed by the invention is applicable to the treatment of the desulfurization waste liquid which is generated from the process of desulfurization and decyanation of the gas by a catalytic oxidation process, and is suitable for the waste liquid treatment in the field of desulfurization process of hydrogen sulfide-containing gases such as coke oven gas, natural gas, coal-bed methane and refinery gas. By the method, the ammonium thiosulfate salt in the waste liquid is converted into the ammonium sulfate salt and the ammonium thiocyanate salt is protected, and the ammonium thiosulfate salt and the ammonium thiocyanate salt are separated from the waste liquid and purified into products.

Description

technical field [0001] The invention belongs to the technical field of desulfurization waste liquid treatment, in particular to a method for extracting ammonium thiocyanate from ammonia desulfurization waste liquid by oxidation. Background technique [0002] The catalytic oxidation desulfurization process using ammonia as the alkali source will inevitably produce desulfurization waste liquid. For a long time, the domestic desulfurization process has no supporting design, and most of the waste liquid produced is consumed by remixing coking coal or being used for wet coke quenching. Coke equipment corrosion, gas desulfurization costs increase, and gas system equipment corrosion rate rises. The existing waste liquid treatment devices basically adopt fractional crystallization physical process, which is not easy to extract high-purity qualified products at one time. The reason is that there are many sulfur compounds and salts in the waste liquid. Ammonium sulfate, ammonium thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/20C02F9/10
Inventor 崔平张超群何泊宁袁长胜
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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