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Desulfurization for simultaneous removal of hydrogen sulfide and sulfur dioxide

A technology for sulfur dioxide and hydrogen sulfide, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve problems such as low treatment efficiency, environmental problems, excessive loss of chemicals, etc.

Inactive Publication Date: 2007-05-16
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 using a catalyst.

[0051] 1.5 liters of water was introduced into a stirred reactor, where hydrogen sulfide, sulfur dioxide and air were introduced through a porous diffuser located at the bottom of the reactor so that the flow rate of hydrogen sulfide was 10ml / min, and the flow rate of sulfur dioxide was 5ml / min. The air flow rate 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 shows the sulfur removal efficiency as a function of reaction time. In Fig. 2, (a), (b), (c), (d) and (e) respectively represent when SO 2 Closed, SO 2 Open, H 2 S is off, H 2 S opens and the point when the oxidant becomes oxygen.

[0054] As shown in Figure 2, it can be seen that the removal efficiency of hydrogen ...

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. Disperse 20g of MgO in 200ml of water, and then add 1N ferric nitrate solution to it to make Fe relative to MgO 6wt%, and then dry and calcinate the result at 450°C to prepare 6wt% Fe / MgO catalyst.

[0057] The results are shown in Figure 3. In Fig. 3, (a), (b), (c), (d) and (e) respectively represent when SO 2 Closed, SO 2 Open, H 2 S is off, H 2 S turns on and the point when the oxidant becomes nitrogen.

[0058] Fig. 3 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 where no catalyst is used. After point (e) when the oxidant becomes nitrogen, the removal efficiency of hydrogen sulfide and sulfur dioxide gradually decreases.

Embodiment 3

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

[0061] As a result, when the concentration of sulfur dioxide is higher than that of hydrogen sulfide, the removal efficiency of hydrogen sulfide is high, as shown in FIG. 4. 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 is 5:5 or 10:5, a sudden drop in removal efficiency is observed at the beginning of the reaction, which indicates that there is 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] After the HDS (hydrodesulfurization) process, hydrogen sulfide (H 2 S). Through the Claus process, about 95% of the H discharged from the HDS process 2 S is converted to elemental sulfur. The unreacted tail gas still contains about 0.3-1.5 vol% H 2 S and about 0.15-0.75% by volume of sulfur dioxide (SO 2 ). [0003] Many technologies have been developed to treat exhaust gases with this composition. A representative one is the SCOT process, in which the hydrogenation reaction reduces the residual SO 2 Convert to H 2 S is then recycled back to the Claus process through the amine absorption / desorption process. Part H that remains in the SCOT process 2 S is oxidized to SO in the incinerator 2 And SO 2 The concentration is reduced to 250 ppm or less, and then discharged into the air (see Anon, Sulfur, 22...

Claims

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Application Information

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Patent Type & Authority Applications(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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