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Method of for desulfurization by wet oxidation of hydrogen sulfide at medium-high temperature

A technology of wet oxidation and hydrogen sulfide, applied in the direction of catalytic conversion gas purification of impurities, etc., can solve the problems of difficult regeneration of desulfurizer, difficult recovery of sulfur from desulfurization products, reduction of catalyst activity concentration, etc., so as to avoid waste of sensible heat and latent heat. , Fast and efficient oxidation removal, no secondary pollution effect

Inactive Publication Date: 2012-07-11
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in wet desulfurization, since the reaction catalytic system is an aqueous solution system, on the one hand, as the reaction progresses, the by-product water continuously dilutes the catalyst solution system, resulting in a decrease in the catalyst activity concentration. Finally, the catalyst active components must be continuously replenished in the production process. As a result, a large amount of waste water pollutants will inevitably be generated and operating costs will be increased. It is difficult to recover sulfur from the desulfurization product, and there are problems such as sulfur plugging and salt plugging. At the same time, the sensible heat in the gas is lost, which reduces the thermal efficiency of coal utilization
[0004] Dry desulfurization using metal oxide adsorbent can directly desulfurize at high temperature, and save the cooling and reheating steps required for solvent absorption, but the regeneration of desulfurizer is difficult, the sulfur capacity is relatively low, and it can only be applied to fine desulfurization. Its catalyst is difficult to adapt to the large volume process

Method used

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  • Method of for desulfurization by wet oxidation of hydrogen sulfide at medium-high temperature
  • Method of for desulfurization by wet oxidation of hydrogen sulfide at medium-high temperature
  • Method of for desulfurization by wet oxidation of hydrogen sulfide at medium-high temperature

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Embodiment 1

[0032] With 1-butyl-3-methylimidazole chloride (BmimCl) and ferric chloride hexahydrate (FeCl 3 ·6H 2 O) is the synthesis of iron-based ionic liquid for raw materials with a molar ratio of 1:2. figure 2 It is the thermogravimetric analysis result of the iron-based ionic liquid between 30°C and 400°C. The iron-based ionic liquid has almost no weight loss at 30°C-250°C, and the weight loss is only about 0.2% at 300°C, which has good thermal stability.

[0033] Take a little sample in a crucible and put it in a muffle furnace, and calcine it at a certain temperature. Depend on image 3 It can be seen that after being treated in a muffle furnace at 200 °C for 1 h, there is no difference between the imidazolium chloride-based ionic liquid and the sample at 100 °C. The baseline drifted, which was the same as the variable temperature Raman spectrum at 240°C. At this time, the fluidity of the imidazolium chloride-based ionic liquid became worse, indicating that the physical prope...

Embodiment 2

[0035] Add 200mL of the iron-based ionic liquid in Example 1 to the reactor, control the reaction temperature by the oil bath, and pass the hydrogen sulfide standard gas with a concentration of 10000ppm into the desulfurizer at a flow rate of 120mL / min. Figure 4 It shows that when the temperature is not lower than 120°C, the desulfurization rate of the iron-based ionic liquid is all above 99% within 2 hours, and the desulfurization efficiency can be significantly improved by increasing the temperature.

Embodiment 3

[0037] Add 200mL of the iron-based ionic liquid in Example 1 to the reactor, adjust the reaction temperature to 140°C with an oil bath, and pass hydrogen sulfide standard gas into the desulfurizer at a flow rate of 120mL / min. Figure 5 It shows that when the concentration of hydrogen sulfide is 10000ppm, the removal rate of hydrogen sulfide can reach 100% within 2 hours of reaction time; as the concentration of hydrogen sulfide gradually increases to 50000ppm, the desulfurization rate finally decreases to 74.4%.

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Abstract

The invention relates to a new method for desulfurization by wet oxidation of hydrogen sulfide using iron-based ionic liquid at medium-high temperature. The iron-based ionic liquid is heatproof liquid with strong absorption and oxidation properties. Application of the iron-based ionic liquid can not only effectively absorb hydrogen sulfide gas within a concentration range of 0-100% at 70-240 DEG C, but also can oxidize hydrogen sulfide gas into elemental sulfur in a fast and efficient way. The sulfur is cooled and separated, and the iron-based ionic liquid is regenerated and reused after being subjected to oxygen oxidation. Adjustment of the pH of a reaction system is not needed during the process of high-temperature oxidation of hydrogen sulfide in the iron-based ionic liquid, and the acidity characteristic of the iron-based ionic liquid can avoid production of sulfur-containing by-products. Wet oxidation of hydrogen sulfide can be realized at a temperature ranging from 70 DEG C to 240 DEG C through adjustment of flow and concentration of hydrogen sulfide gas and adoption of combined process of absorption-oxidation-separation-regeneration, the desulfurization percent can reach over 99%, and no secondary pollution is produced.

Description

technical field [0001] The invention relates to a new medium-high temperature wet oxidation hydrogen sulfide desulfurization method using iron-based ionic liquid as an oxidant. The method can directly adopt a wet oxidation method to oxidize hydrogen sulfide desulfurization under medium-high temperature conditions without adjusting the pH value and has no by-products Generation is a green high-temperature wet oxidation hydrogen sulfide removal process. technical background [0002] The clean conversion and utilization of coal is an important energy technology that meets the goal of sustainable development of mankind. Integrated gasification combined cycle (IGCC) power generation technology has attracted worldwide attention due to its potential environmental friendliness, economy and high efficiency, but the gasification gas still contains H 2 S, COS, CS 2 (of which 90% are H 2 Harmful gases such as S), HCl, HCN and NO are not only highly corrosive, causing corrosion of equ...

Claims

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Application Information

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IPC IPC(8): C10K1/34
Inventor 余江孙磊磊
Owner BEIJING UNIV OF CHEM TECH
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