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Desulfurization for simultaneous removal of hydrogen sulfide and sulfur dioxide

一种二氧化硫、硫化氢的技术，应用在化学仪器和方法、分离方法、弥散粒子分离等方向，能够解决环境问题、化学品过度损失、催化剂活性丧失等问题

Inactive Publication Date: 2009-04-01
KOREA INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, due to the environmental concerns caused by the Stretford process involving vanadium oxide catalysts, recent trends have shifted to iron oxide based processes
The LO-CAT II process uses iron chelates as well as other chemicals due to stability, but this can be problematic due to the following reasons: large size reactors are required containing about 500-3000 ppm catalyst concentration; Loss of catalyst activity due to deposition; excessive loss of chemicals during sulfur recovery; and low process efficiency resulting from using 4 moles of iron chelate to treat 1 mole of sulfur
In addition, even though the cost of chemicals in the Bio-SR process is less than that of the LO-CAT II process, if the risks and operating costs of biological treatment are considered, the actual operating cost of the Bio-SR process is much greater than that of the LO-CAT II process

Method used

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  • Desulfurization for simultaneous removal of hydrogen sulfide and sulfur dioxide
  • Desulfurization for simultaneous removal of hydrogen sulfide and sulfur dioxide
  • Desulfurization for simultaneous removal of hydrogen sulfide and sulfur dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1 illustrates the effect of simultaneous removal of hydrogen sulfide and sulfur dioxide in a batch wet oxidation reaction without the use of a catalyst.

[0051] 1.5 liters of water were introduced into a stirred reactor, wherein hydrogen sulfide, sulfur dioxide and air were introduced through a porous diffuser positioned at the bottom of the reactor so that the flow of hydrogen sulfide was 10ml / min, and the flow of sulfur dioxide was 5ml / min, as the oxidant The flow rate of air is 100ml / min. After the reaction, the product gas was analyzed by gas chromatography, and the result was converted into removal efficiency using the following equation.

[0052]

[0053] figure 2 In represents the sulfur removal efficiency as a function of reaction time. exist figure 2 Among them, (a), (b), (c), (d) and (e) represent respectively when SO 2 Close, SO 2 Open, H 2 S off, H 2 S opens and the point when the oxidizing agent becomes oxygen.

[0054] Such as figure 2...

Embodiment 2

[0056] The procedure of Example 1 was repeated except that 3 g of 6 wt% Fe / MgO catalyst was used in Example 2. 20g of MgO was dispersed in 200ml of water, and 1N ferric nitrate solution was added thereto so that Fe became 6wt% relative to MgO, and then dried and roasted at 450°C to prepare 6wt% Fe / MgO catalyst.

[0057] result in image 3 shown in . exist image 3 Among them, (a), (b), (c), (d) and (e) represent respectively when SO 2 Close, SO 2 Open, H 2 S off, H 2 S opens and the point when the oxidant becomes nitrogen.

[0058] image 3 It shows that the respective removal efficiency and simultaneous removal efficiency of hydrogen sulfide and sulfur dioxide in Example 2 using Fe / MgO catalyst are much higher than that in Example 1 without catalyst. After point (e) when the oxidant is changed to nitrogen, the removal efficiency of hydrogen sulfide and sulfur dioxide gradually decreases.

Embodiment 3

[0060] Using 3 g of 6 wt% Fe / MgO catalyst, except that the reaction gas ratio between hydrogen sulfide and sulfur dioxide was changed to 5:5, 5:15 and 10:5 and except that air was used as oxidant while the total gas flow was fixed at 110 / ml / min, repeat the same desulfurization step as in Example 2.

[0061] As a result, the removal efficiency of hydrogen sulfide is high when the concentration of sulfur dioxide is higher than that of hydrogen sulfide, as Figure 4 shown. This means that sulfur dioxide plays a key role as an oxidant in the desulfurization reaction of the present invention. Specifically, when the ratio between hydrogen sulfide and sulfur dioxide was 5:5 or 10:5, a sudden drop in removal efficiency was observed at the beginning of the reaction, which indicated that there was an induction period in the desulfurization reaction of the present invention.

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Abstract

A highly efficient desulfurization method for removing a hydrogen sulfide and a sulfur dioxide simultaneously comprises the step of contacting a gas containing the hydrogen sulfide and the sulfur dioxide with water, or an aqueous solution containing a first heterogeneous catalyst for desulfurization to oxidize the hydrogen sulfide with the sulfur dioxide. 3~5% sulfur-containing tail gas exhausted from, especially, Claus Process can be treated at a high efficiency of over 99%.

Description

technical field [0001] The invention relates to a high-efficiency desulfurization method for simultaneously removing hydrogen sulfide and sulfur dioxide. Background technique [0002] Hydrogen sulfide (H 2 S). About 95% of the H emitted by the HDS process through the Claus process 2 S is converted to elemental sulfur. The unreacted tail gas still contains about 0.3-1.5% by volume of H 2 S and about 0.15-0.75% by volume of sulfur dioxide (SO 2 ). [0003] A number of technologies have been developed to treat exhaust gases with this composition. A representative one is the SCOT process, in which the hydrogenation reaction converts the residual SO 2 converted to H 2 S, then recycled back to the Claus process via the amine absorption / desorption process. Part of the H still remaining in the SCOT process 2 S is oxidized to SO in the incinerator 2 and SO 2 The concentration is reduced to 250ppm or lower, and then discharged into the air (see Anon, Sulfur, 227(1993) 39)....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/50B01D53/52
CPCB01D53/8615B01D53/50B01D53/52B01D53/86
Inventor 郑光德朱五心吴俊雨李垠九崔京一
Owner KOREA INST OF SCI & TECH
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