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A kind of combined desulfurization and dephosphorization method

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

Active Publication Date: 2016-06-01
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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  • A kind of combined desulfurization and dephosphorization method
  • A kind of combined desulfurization and dephosphorization method
  • A kind of combined desulfurization and dephosphorization method

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-methylimidazole chloride (BmimCl) and ferric chloride hexahydrate (FeCl 3 ·6H 2 O) as a raw material, synthesized at a molar ratio of 1:2 to obtain an iron-based ionic liquid (Fe-IL);

[0048] The mass fraction of iron ions in the iron-based ionic liquid measured by the HI83200 (C200) type multi-parameter ion analyzer is 14.4%, and the mass fraction of C, H, and N in the iron-based ionic liquid measured by the VarioEl elemental analyzer is 26.2% respectively. %, 4.3%, 8.6%, therefore, it can be deduced that the chemical formula of the iron-based ionic liquid can be recorded 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] Fully stir and mix 1-butyl-3-methylchloroimidazole and palladium chloride with a mass ratio of 49:1 in an open natural environment at 80°C to prepare a palladium-based ionic liquid;

[0051] According to GB / T23276-2009, the mass fraction of palladium ions in the palladium-based ionic liquid was determined to be 1.2% by dimethylglyoxaloxime precipitation EDTA complexometric titration method, and the palladium-based The mass fractions of C, H, and N in the ionic liquid are 53.9%, 8.4%, and 15.7%, respectively, so the chemical formula of the palladium-based ionic liquid can be deduced as [BmimCl] 50 PdCl 2 ;

[0052] The iron-based ionic liquid prepared in Example 1 and the palladium-based ionic liquid were fully stirred and mixed in an open natural environment at a mass ratio of 1000:1, and the obtained Fe-Pd-based ionic liquid was recorded as Fe-Pd-IL.

Embodiment 3

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

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

[0055] It is 0.7% to measure the massfraction of copper ion in the copper-based ionic liquid with HI83200 (C200) type multi-parameter ion analyzer, and to measure the massfraction of C, H and N in the copper-based ionic liquid with VarioEl type elemental analyzer is respectively 54.1%, 8.5%, 15.8%, so the chemical formula of copper-based ionic liquid can be deduced as [BmimCl] 48 CuCl 2 ;

[0056] The iron-based ionic liquid prepared in Example 1 and the copper-based ionic liquid were thoroughly stirred and mixed in an open natural environment at a mass ratio of 1000:1, and the obtained Fe-Cu-based ionic liquid was recorded 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, specifically refers to the combined removal of hydrogen sulfide and phosphine in a mixed gas system, is a green and efficient removal process, and belongs to the fields of air pollution control and waste recycling. Background technique [0002] h 2 S is a poisonous, harmful and colorless gas with an irritating odor. pH 3 A colorless gas with a fishy odour, flammable and highly toxic. Phosphorus chemical production waste gas, closed calcium carbide furnace waste gas, calcium carbide acetylene gas and other systems all have a large amount of H at the same time. 2 S.PH 3 Impurity gas has a complex system and is a toxic pollutant that is difficult to purify. It not only endangers human health and pollutes the environment, but also corrodes equipment and pipelines, and causes catalyst poisoning in subsequent production processes, which seriously restricts industrial deep p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/52B01D53/46B01D53/96
Inventor 余江陈标华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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