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Combined desulfuration dephosphorization method

A technology for dephosphorization and hydrogen sulfide, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of high oxidant consumption, poor operability, corrosion of pipelines, etc., and achieve no secondary pollution, low cost, The effect of high removal efficiency

Active Publication Date: 2014-10-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that since most reaction catalytic systems are aqueous solutions, as the reaction proceeds, the by-product water continuously dilutes the catalytic reaction system, resulting in a decrease in catalyst activity concentration. Adding catalyst to the reaction system will eventually lead to a large amount of waste water, which increases operating costs on the one hand, and causes problems such as sulfur plugging and salt plugging in the system, and it is difficult to recover sulfur from desulfurization products; dry desulfurization is mainly used in Fine desulfurization also has the problem of difficult desulfurization agent regeneration, and its catalyst is difficult to adapt to large-volume processes
Wet dephosphorization has the advantages of fast speed and high efficiency, but the oxidant consumption in the wet dephosphorization process is large, and the concentration of oxidant determines the dephosphorization efficiency, so its cost is high, and the dephosphorization efficiency fluctuates greatly
In addition, the operability of the device is relatively poor, and problems such as blockage and corrosion of pipelines are prone to occur.
At present, there is no report on the use of ionic liquid combined desulfurization and dephosphorization method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: Preparation of iron-based ionic liquid (Fe-IL)

[0047] With 1-butyl-3-methylchloroimidazole (BmimCl) and ferric chloride hexahydrate (FeCl 3 ·6H 2 O) as the raw material, the molar ratio is 1:2 to synthesize iron-based ionic liquid (Fe-IL);

[0048] The mass fraction of iron ions in the iron-based ionic liquid measured by the HI83200 (C200) multi-parameter ion analyzer is 14.4%, and the mass fractions of C, H, and N in the iron-based ionic liquid measured by the Vario El element analyzer are respectively 26.2%, 4.3%, 8.6%, therefore, the chemical formula of iron-based ionic liquid can be calculated as C 8 H 15 N 2 FeCl 4 , Can also be recorded as [Bmim]FeCl 4 (The same below).

Embodiment 2

[0049] Example 2: Preparation of Fe-Pd-based ionic liquid (Fe-Pd-IL)

[0050] Mixing 1-butyl-3-methylchloroimidazole with a mass ratio of 49:1 and palladium chloride in an open natural environment at 80° C. to obtain a palladium-based ionic liquid;

[0051] According to GB / T23276-2009, the determination was carried out by the EDTA complexometric titration method with dimethylglyoxime precipitation. The mass fraction of palladium ions in the palladium-based ionic liquid was measured to be 1.2%. The palladium was measured with a Vario El type elemental analyzer. The mass fractions of C, H, and N in the base ionic liquid are 53.9%, 8.4%, and 15.7%, respectively. Therefore, the chemical formula of the palladium-based ionic liquid can be calculated as [BmimCl] 50 PdCl 2 ;

[0052] The iron-based ionic liquid prepared in Example 1 and the palladium-based ionic liquid were mixed thoroughly in an open natural environment at a mass ratio of 1000:1, and the Fe-Pd-based ionic liquid prepared wa...

Embodiment 3

[0053] Example 3: Preparation of Fe-Cu-based ionic liquid (Fe-Cu-IL)

[0054] Mixing 1-butyl-3-methylchloroimidazole with a mass ratio of 49:1 and copper chloride in an open natural environment at 80°C to prepare a copper-based ionic liquid;

[0055] The mass fraction of copper ions in the copper-based ionic liquid measured by the HI83200 (C200) multi-parameter ion analyzer was 0.7%, and the mass fraction of C, H, and N in the copper-based ionic liquid was measured by the Vario El element analyzer. It is 54.1%, 8.5%, 15.8%, so the chemical formula of the copper-based ionic liquid can be written as [BmimCl] 48 CuCl 2 ;

[0056] The iron-based ionic liquid prepared in Example 1 and the copper-based ionic liquid were mixed thoroughly in an open natural environment at a mass ratio of 1000:1, and the Fe-Cu-based ionic liquid prepared was denoted as Fe-Cu-IL.

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Abstract

The invention relates to a combined desulfuration dephosphorization method. The method comprises: firstly preparing an iron-based ionic liquid and a Fe-M based ionic liquid (M=Cu, Mn, Zn or Pd), then introducing a gas mixture of hydrogen sulfide and hydrogen phosphide into the iron-based ionic liquid for desulfuration, then introducing the gas mixture of hydrogen sulfide and hydrogen phosphide into the Fe-M based ionic liquid for dephosphorization, so as to realize combined removal of hydrogen sulfide and hydrogen phosphide in the system and obtain a purified gas, and regenerating the iron-based ionic liquid and the Fe-M based ionic liquid and realizing cycle use. The method is a green efficient technology for removing hydrogen sulfide and hydrogen phosphide, and is applicable to purify industrial raw gas, chemical industry production process gas, industry production tail gas and other systems containing hydrogen sulfide and hydrogen phosphide. The method also has the characteristics of relatively high removal efficiency, no secondary pollution, regenerable and recyclable removing agent, low cost and the like.

Description

Technical field [0001] The invention relates to a combined desulfurization and dephosphorization method, in particular to the combined removal of hydrogen sulfide and phosphine in a mixed gas system. It is a green and efficient removal process and belongs to the field of air pollution control and waste recycling. Background technique [0002] H 2 S is a toxic, harmful and colorless gas with a pungent odor. PH 3 It is a colorless gas with fishy smell, flammable and highly toxic. There are a large amount of H in the phosphorous chemical industry production waste gas, closed calcium carbide furnace waste gas, and calcium carbide to acetylene gas. 2 S, PH 3 Impurity gas, a complex system, is a toxic pollutant that is difficult to purify. It not only harms human health, pollutes the environment, but also corrodes equipment and pipelines, and causes catalyst poisoning in subsequent production processes, which severely restricts industrial deep processing and endangers production safety...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/52B01D53/46B01D53/96
Inventor 余江李义烁张婷婷郭智慧顾佳佳葛喜乐胡锦超谭铧铧
Owner BEIJING UNIV OF CHEM TECH
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