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A normal temperature liquid phase claus process using ionic liquid as medium

An ionic liquid, normal temperature technology, applied in gas treatment, separation methods, dispersed particle separation, etc., to achieve the effects of no VOCs emissions, low operating temperature, and low energy consumption

Active Publication Date: 2018-01-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the use of ionic liquids as the medium of the Claus process, and it is obviously more attractive to use ionic liquids instead of volatile organic solvents in the normal temperature liquid phase Claus process.

Method used

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  • A normal temperature liquid phase claus process using ionic liquid as medium
  • A normal temperature liquid phase claus process using ionic liquid as medium
  • A normal temperature liquid phase claus process using ionic liquid as medium

Examples

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Effect test

Embodiment 1

[0033] Embodiment 1: its technology sees attached figure 1 , the absolute pressure is 1MPa, the temperature is 30℃, H 2 The natural gas whose S content (mol fraction) is 1% is input into the large absorption tower A1 at 1 place. The absorbing liquid used is the ionic liquid 1-hexyl-3-methylimidazolium chloride ([hmim][Cl]). The operating temperature of the large absorption tower A1 is normal temperature, the operating pressure is 1MPa, and the operating liquid-gas ratio is 20Kg / Nm 3 . The operating temperature of the small absorption tower A2 is normal temperature, the operating pressure is normal pressure, and the operating liquid-gas ratio is 5Kg / Nm 3 . Contains SO 2 The pressure of the gas flow is normal pressure and the temperature is 30°C, and it enters the small absorption tower A2 from position 3. The packing used in absorption towers A1 and A2 is mellapak250Y. The operating pressure of the reaction tower D is 1MPa, the operating temperature at the top of the tow...

Embodiment 2

[0035] Embodiment 2: its technique is similar to embodiment 1, see attached figure 1 , the absolute pressure is 0.1MPa, the temperature is 30℃, H 2 The coke oven gas with S content (mole fraction) of 3% is input into the large absorption tower A1 from one place. The ionic liquid used is trifluoroacetic acid-triethylbutylammonium salt ([N 2224 ][CF 3 COO - ]). The operating temperature of the large absorption tower A1 is normal temperature, and the operating liquid-gas ratio is 40Kg / Nm 3 . The operating temperature of the small absorption tower A2 is normal temperature, and the operating pressure is normal pressure. Contains SO 2 The gas flow pressure is normal pressure, the temperature is 30°C, and the operating liquid-gas ratio is 5Kg / Nm 3 , and enter the small absorption tower A2 from position 3. The packing used in absorption towers A1 and A2 is mellapak250Y. The operating pressure of the reaction tower D is 1MPa, the operating temperature at the top of the tower ...

Embodiment 3

[0036] Embodiment 3: its technique is similar to embodiment 1, see attached figure 1 , the absolute pressure is 1MPa, the temperature is 30℃, H 2 Hydrodesulfurized gas with S content (mole fraction) of 2% is input into large absorption tower A1 from 1 place. The ionic liquid used was N-butylpyridinium chloride ([BuPy][Cl]). The operating temperature of the large absorption tower A1 is normal temperature, and the operating liquid-gas ratio is 10Kg / Nm 3 . The operating temperature of the small absorption tower A2 is normal temperature, the operating pressure is normal pressure, and the operating liquid-gas ratio is 5Kg / Nm 3 . Contains SO 2 The pressure of the gas flow is normal pressure and the temperature is 30°C, and it is input into the absorption tower A2 from position 3. The packing used in absorption towers A1 and A2 is mellapak250Y. The operating pressure of the reaction tower D is 1MPa, the operating temperature at the top of the tower is normal temperature, H 2 ...

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Abstract

The invention discloses a room-temperature liquid-phase Claus process taking ionic liquid as media. The room-temperature liquid-phase Claus process includes pumping ionic liquid absorbing H2S and another ionic liquid absorbing SO2 into a reaction tower with baffles and stirring blades inside for action, pumping out the reacted ionic liquid containing solid sulphur via a pump, enabling the ionic liquid containing the solid sulphur to sequentially pass a filtering, washing and drying all-in-one machine and a flash tank, dividing the ionic liquid into two streams to enter two absorption towers for respectively absorbing H2S and SO2, and enabling the ionic liquid after absorbing the H2S and SO2 to return to the reaction tower so as to form circulation. The H2S is sourced from to-be-treated gas, and the SO2 is obtained from part of sulphur by burning. The filtered ionic liquid has good H2S and SO2 dissolution characteristics, and can be recycled for a long time; the developed room-temperature liquid-phase Claus process is low in operating temperature, small in energy consumption, free of VOCs (volatile organic compounds) emission and needless of subsequent tail gas treatment, can be used for producing high-purity sulphur, and is a green and environment-friendly liquid-phase Claus reaction innovation process.

Description

technical field [0001] The invention relates to a normal temperature liquid-phase Claus process, which is a kind of process that uses ionic liquid as the medium of Claus reaction to remove H in industrial gas. 2 A new approach to S. Background technique [0002] Natural gas, hydrodesulfurized gas and refinery gas used in industrial production contain hydrogen sulfide gas (H 2 S), H 2 The existence of S will not only cause corrosion of equipment and pipelines, but also poison and deactivate the catalyst, and has a great poisonous effect on the human body and the environment, so it must be treated in a harmless manner. Currently widely used in industrial production to remove H 2 The method of S gas is the reversible absorption method of organic amine mixed liquid. Commonly used organic amines include ethanolamine, N-methyldiethanolamine, diisopropanolamine and tert-butylaminoethoxyethanol. However, the organic amine solution is highly corrosive to equipment, has strong vol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/77B01D53/48
CPCB01D53/1481B01D53/523B01D53/77B01D2252/30B01D2257/302B01D2257/304
Inventor 吴有庭张效敏黄宽胡兴邦
Owner NANJING UNIV
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