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Method for simultaneously removing hydrogen sulfide and ammonia gas by using iron-based ionic liquid

An iron-based ionic liquid, ionic liquid technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of complicated operation, long purification process flow, high sulfur capacity, and improve the low-temperature oxidative desulfurization rate. , The effect of reducing equipment costs and shortening the process flow

Active Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The common feature of the traditional wet redox desulfurization process is that it is carried out in aqueous solution, especially when it is under alkaline conditions, there are chelating agents that are expensive, easy to degrade, and the side reactions are intensified when the sulfur capacity is high. Problems such as poor sulfur quality
The sulfuric acid production process is a traditional method of ammonia recovery, with better absorption effect and no pollution to the environment, but the fatal shortcoming of this process is that the income from recovering ammonium sulfate is far from enough to cover its production costs
The purification of hydrogen sulfide and ammonia are mostly two independent processes, resulting in long process flow, high cost and complicated operation of the whole purification process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 using [bmim]FeCl 4 and [bmim] 3 PMo 12 o 40 The solution removes H 2 S

[0026] [bmim] 3 PMo 12 o 40 and [bmim]FeCl 4 Prepare 50 mL of desulfurization solution at a volume ratio of 1 / 9. Mixed gas composition H 2 S is 1% (V), N 2 99% (V). Pass it into the solution at a flow rate of 30 ml / min, and the conversion rate of sulfur is 98% after 5 hours. Then, the previous solution was regenerated by air for 8 hours, and the heating temperature was 40°C. When the mixed gas is fed again under the same conditions as above, the conversion rate of sulfur is 98%. After 4 cycles like this, the desulfurization performance of the solution did not decrease.

Embodiment 2

[0027] Example 2 using [bmim]FeCl 4 and [bmim] 3 PMo 12 o 40 solution to remove NH 3

[0028] [bmim] 3 PMo 12 o 40 and [bmim]FeCl 4 According to the volume ratio of 1 / 9, prepare 50 mL of deamination solution. Mixed gas composition NH 3 1% (V), N 2 99% (V). Pass it into the solution at a flow rate of 30 ml / min, and the deamination efficiency is 99% after 5 hours. Then add 12ml of concentrated phosphoric acid to the previous solution, and the heating temperature is 40°C. When the mixed gas is fed again under the same conditions as above, the deammonization efficiency is 99%. After 4 cycles like this, the deamination performance of the solution did not decrease.

Embodiment 3

[0029] Example 3 using [bmim]FeCl 4 and [bmim] 3 PMo 12 o 40 The solution simultaneously removes H 2 S and NH 3

[0030] [bmim] 3 PW 12 o 40 and [bmim]FeCl 4 Prepare 50 mL of desulfurization and deamination solution at a volume ratio of 1 / 9. The composition of the mixed gas is H 2 S (1.0g / m 3 ), NH 3 (1.0g / m 3 ). When the flow rate of 30 ml / min was passed into the solution, the conversion rate of sulfur was 98% and the deammonization efficiency was 99% after 5 hours. Then add 12ml of concentrated phosphoric acid to the previous solution, and regenerate it with air for 8 hours, and the heating temperature is 40°C. When the mixed gas is fed again under the same conditions above, the conversion rate of sulfur is 98%, and the deammonization efficiency reaches 99%. After 4 cycles in this way, the desulfurization and denitrification efficiency of the solution did not decrease.

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Abstract

The invention belongs to the technical field of gas purification, and relates to a method for simultaneously removing hydrogen sulfide and ammonia gas by using iron-based ionic liquid. The liquid for desulphurization and deamination mainly comprises iron-based ionic liquid and heteropoly acid ionic liquid, and the liquid for desulphurization and water are immiscible. The method for desulphurization and deamination employs the iron-based ionic liquid which contains a heteropoly acid ionic liquid catalyst to oxidize H2S into a elementary substance sulfur, and at the same time hydrogen at a second position in an iron-based ionic liquid imidazole ring and NH3 form an ammonium. The iron-based ionic liquid after desulphurization and deamination is treated with concentrated hydrochloric acid or concentrated phosphoric acid, and the iron-based ionic liquid can be regenerated and recycled after reaction with air. The method integrates and simplifies hydrogen sulfide and ammonia containing gas mixture purifying technology, and has the advantages of high absorption efficiency, easy regeneration without side reactions, easy recovery of products, and the like; and the method can be used for realizing combined desulphurization and deamination with low cost for a system with simultaneous existence of hydrogen sulfide and ammonia gas in coal coking, coal gasification, biogas, tail gas of ammonia synthesis, Claus tail gas, and the like.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and relates to a method for simultaneously removing hydrogen sulfide and ammonia by an iron-based ionic liquid. Background technique [0002] Hydrogen sulfide is a very harmful impurity in industrial gases such as petrochemical, natural gas, oilfield development, coke oven gas and semi-water gas. Ammonia is a colorless and irritating gas, which exists in large quantities in the coal chemical production process, and will generate nitrogen oxides to pollute the environment after direct combustion. Hydrogen sulfide and ammonia often exist simultaneously in systems such as coal coking, coal gasification, biogas, synthetic ammonia tail gas, and Claus tail gas. Their existence will not only cause corrosion of equipment and pipelines, but also cause serious harm to the environment, and they are pollutants that must be eliminated or controlled. [0003] The methods for removing hydrogen sulfid...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/78B01D53/52B01D53/58B01D53/96
CPCY02A50/20
Inventor 杨建平朱燕俞健健冯亚平
Owner CHINA PETROLEUM & CHEM CORP
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