Hydrogen sulfide liquid-phase oxidation removing method taking deep-eutectic solvent as medium

A technology of deep eutectic solvent and liquid phase oxidation, which is applied in chemical instruments and methods, separation methods, preparation/purification of sulfur, etc. It can solve the problems of volatile substances discharged into the atmosphere, organic amines are easy to degrade, and desulfurization efficiency is reduced. , to achieve excellent solubility, no VOCs emissions, and low operating temperature

Active Publication Date: 2018-11-20
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the dry method, the wet method removes H 2 S has always been the mainstream of industrial process technology, and the most typical alcohol amine method also has many bottleneck problems in its application process: (1) Capture and remove H 2 The energy consumption of the S process is high; (2) Most alcohol amine absorbents are volatile, and volatile substances (VOCs) will be emitted into the atmosphere during use, forming secondary pollution; (3) Organic amines are easy to degrade

Method used

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  • Hydrogen sulfide liquid-phase oxidation removing method taking deep-eutectic solvent as medium
  • Hydrogen sulfide liquid-phase oxidation removing method taking deep-eutectic solvent as medium
  • Hydrogen sulfide liquid-phase oxidation removing method taking deep-eutectic solvent as medium

Examples

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Embodiment 1

[0025] Example 1: Take the preparation of 1-ethyl-3-methylimidazol-2-imidazolidinone (molar ratio 1:2) as an example in the case of deep eutectic solvent chlorination, which is prepared by hydrogen bond donor 2-imidazolidine Ketone and hydrogen bond acceptor 1-ethyl-3-methylimidazolium chloride are mixed at a molar ratio of 1:2, stirred at 80°C until they eutectic, and the liquid obtained after cooling to room temperature is a deep eutectic solvent . The preparation method of the deep eutectic solvent used in the following examples is similar.

Embodiment 2

[0026] Embodiment 2: The hydrogen sulfide liquid-phase oxidation removal method using deep eutectic solvent as the medium, its method schematic diagram is shown in the appendix figure 1 , the H 2 Natural gas with a volume fraction of S of 0.8% from H 2 S is input from the bottom of absorption tower 1, and the deep eutectic solvent chlorinated 1-ethyl-3-methylimidazol-2-imidazolidinone (molar ratio 1:2) is input from the top of absorption tower 1. h 2 The operating temperature of S absorption tower 1 is room temperature, the operating pressure is 1.0MPa, and the operating liquid-gas ratio is 10Kg / Nm 3 . Will SO 2 The volume fraction of 0.2% coal combustion flue gas from SO 2 The bottom of the absorption tower 2 is input, and the deep eutectic solvent chlorinated 1-ethyl-3-methylimidazol-2-imidazolidinone (molar ratio 1:2) is input from the top of the absorption tower 2. SO 2 The operating temperature of the absorption tower 2 is room temperature, the operating pressure i...

Embodiment 3

[0027] Embodiment 3: its technique is similar to embodiment 2, see attached figure 1 , the H 2 S volume fraction of 3% coke oven gas from H 2 S is input from the bottom of absorption tower 1, and the deep eutectic solvent chlorinated 1-butyl-3-methylimidazol-2-pyrrolidone (molar ratio 1:2) is input from the top of absorption tower 1. h 2 The operating temperature of S absorption tower 1 is room temperature, the operating pressure is 1.0MPa, and the operating liquid-gas ratio is 8Kg / Nm 3 . Will SO 2 The volume fraction of 0.2% coal combustion flue gas from SO 2 The bottom of the absorption tower 2 is input, and the low co-solvent chloride 1-butyl-3-methylimidazol-2-pyrrolidone (molar ratio 1:2) is input from the top of the absorption tower 1. SO 2 The operating temperature of the absorption tower 2 is room temperature, the operating pressure is 0.1MPa, and the operating liquid-gas ratio is 40Kg / Nm 3 . The packing used in absorption towers 1 and 2 is mellapak250Y. H 2...

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Abstract

The invention discloses a hydrogen sulfide liquid-phase oxidation removing method taking a deep-eutectic solvent as a medium, and belongs to the field of chemical separation. Various functionalized deep-eutectic solvents are obtained by mixing one or more of mixture of an amide derivative and a diol derivative serving as a hydrogen bond donor as well as imidazolium salt, quaternary ammonium salt or choline serving as a hydrogen bond receptor according to a certain molar ratio; and the deep-eutectic solvents have the characteristics of stable physical and chemical properties, low price, easiness in preparation, excellent solubility on H2S gas and easiness in recovery. The deep-eutectic solvent designed by the invention can face at the H2S gas in various types of sulfur-containing gas source, efficiently realizes selective trapping of H2S gas and transforms the enriched H2S into high-purity sulfur rapidly by a normal-temperature liquid phase oxidation method; the deep-eutectic solvent can be regenerated and reused after being dried; and the whole process has the advantages of high desulfurization efficiency, mild operation condition, low energy consumption, no discharge of VOCs and the like, and is a novel, green and efficient H2S oxidation removing method.

Description

technical field [0001] The invention belongs to the field of chemical separation, and relates to a method for removing hydrogen sulfide and its resource utilization, in particular to a method for converting hydrogen sulfide into sulfur through high-efficiency liquid phase oxidation at room temperature after enriching hydrogen sulfide in a deep eutectic solvent. Background technique [0002] Hydrogen sulfide (H 2 S) is a highly corrosive and flammable highly toxic gas, which widely exists in gaseous fuels such as natural gas, refinery gas, and synthesis gas, and also in industrial and agricultural gases such as coalbed methane and biogas. h 2 The existence of S not only seriously threatens the environment and personal safety, but also causes equipment and pipeline corrosion, catalyst poisoning, etc. in the process of gas transportation and utilization. How to convert highly toxic and highly corrosive H 2 The safe and reliable storage of S gas and the green and efficient re...

Claims

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Application Information

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IPC IPC(8): C01B17/05B01D53/18B01D53/14
CPCB01D53/1468B01D53/18C01B17/05
Inventor 吴有庭赵天翔胡兴邦
Owner NANJING UNIV
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