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Preparation method of adsorbing agent simultaneously removing H2S and Hg in middle temperature coal gas

An adsorbent and medium-temperature technology, which is applied in chemical instruments and methods, selection of absorbent solid gas purification, and other chemical processes, can solve problems such as difficulties in the further application of gas, process safety issues, and restrictions on application and promotion. Efficient removal and harmless treatment, good desulfurization and mercury removal capabilities, and simplified process effects

Active Publication Date: 2013-08-28
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method introduces oxygen into the hot gas, which brings difficulties to the next application of the gas, increases the production cost, and there are certain safety problems in the process, and its application and promotion are limited

Method used

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  • Preparation method of adsorbing agent simultaneously removing H2S and Hg in middle temperature coal gas
  • Preparation method of adsorbing agent simultaneously removing H2S and Hg in middle temperature coal gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A: Carrier pretreatment

[0034] First, a certain particle size of Al 2 o 3 The carrier was dried at 120°C for 3 hours, and placed in a desiccator for later use.

[0035] B: Preparation of precursor solution

[0036] Prepare 0.4g / ml Fe(NO 3 ) 3 9H 2 O solution.

[0037] C: Preparation of Adsorbent

[0038] Weigh 10g of pretreated γ-Al 2 o 3 Carrier in the crucible, measure 1.90ml Fe(NO 3 ) 3 9H 2 O was diluted with 11.10ml of distilled water and stirred evenly. Evenly added to the γ-Al 2 o 3 carrier crucible. Dry in the air for 10h, dry at 100°C for 12h, and roast at 500°C for 2h to obtain the adsorbent 3wt% Fe 2 o 3 / γ-Al 2 o 3 .

[0039] The prepared adsorbent 3wt% Fe 2 o 3 / γ-Al 2 o 3 Placed in a fixed bed reactor, reaction gas composition: 0.03vol% H 2 S, 60μg / m 3 Hg, 5vol%H 2 , 5vol% CO, 5vol% CO 2 , balance gas N 2 , the reaction volume space velocity is 5000h -1 , respectively at 100°C, 150°C, and 200°C for activity evaluation. When...

Embodiment 2

[0041] A: Carrier pretreatment

[0042] With embodiment 1.

[0043] B: Preparation of precursor solution

[0044] Prepare 0.1g / ml Pd(NO 3 ) 3 2H 2 O solution.

[0045] C: Preparation of Adsorbent

[0046] Weigh 10g of pretreated γ-Al 2 o 3 The carrier is placed in a crucible, and 2.00ml of Pd(NO 3 ) 2 2H 2 O was diluted with 11.00ml of distilled water and stirred. Evenly added to the γ-Al 2 o 3 carrier crucible. Air-dry for 10 hours, dry at 100°C for 12 hours, and bake at 500°C for 2 hours. Prepared Adsorbent 1wt%PdO / γ-Al 2 o 3 . The prepared adsorbent 1wt%PdO / γ-Al 2 o 3 Placed in a fixed bed reactor, reaction gas composition: 0.07vol% H 2 S, 80μg / m 3 Hg, 10vol%H 2 , 20vol% CO, 5vol% CO 2 , balance gas N 2 , the reaction volume space velocity is 5000h -1 , Activity evaluation was carried out at 100°C, 200°C, and 300°C, respectively. When the reaction temperature is 300°C and the reaction time is 400min, the mercury removal rate is 50%, the mercury cap...

Embodiment 3

[0048] A: Carrier pretreatment

[0049] Same as Example 1

[0050] B: Preparation of precursor solution

[0051] Prepare 0.4g / ml Fe(NO 3 ) 3 9H 2 O solution and 0.1 g / ml Pd(NO 3 ) 3 2H 2 O solution.

[0052] C: Preparation of Adsorbent

[0053] Weigh 10g of pretreated γ-Al 2 o 3 Carrier in the crucible, measure 1.90ml Fe(NO 3 ) 3 9H 2 O was diluted with 11.10ml of distilled water and stirred evenly. Evenly added to the γ-Al 2 o 3 carrier crucible. Air-dry for 10 hours, dry at 100°C for 12 hours, and bake at 500°C for 2 hours. Produced 3wt% Fe 2 o 3 / γ-Al 2 o 3 Adsorbent. Then measure 2.00ml Pd(NO 3 ) 2 2H 2 O was diluted with 11.00ml distilled water and stirred evenly. Uniformly added to the 3wt% Fe prepared above 2 o 3 / γ-Al2 o 3 In the adsorbent, air dry for 10 hours, dry at 100°C for 12 hours, and bake at 500°C for 2 hours. Prepared adsorbent 1wt%PdO3wt%Fe 2 o 3 / γ-Al 2 o 3 . The adsorbent prepared above is placed in a fixed-bed reactor, a...

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Abstract

The invention relates to an adsorbing agent simultaneously removing H2S and Hg in middle temperature coal gas and a preparation method of the adsorbing agent as well as the application of the adsorbing agent. The adsorbing agent is metallic oxide loading gamma-Al2O3, wherein metallic oxides are Fe, Zn and / or Pd oxides; according to the total percent by weight of the adsorbing agent, the percent by weight of the Fe oxide, i.e. Fe2O3 is 0-50wt%, the percent by weight of the Zn oxide, i.e. ZnO is 0-40wt%, and the percent by weight of the Pd oxide, i.e. PdO is 0-10wt%, wherein the percent by weight of the Fe, Zn and Pd oxides is asynchronously 0, and the total percent by weight of the content of the Fe, Zn and Pd oxides is less than 100wt%, and the balance is a gamma-Al2O3 carrier. The preparation method has the advantages of simple process and easiness in operation and high removal rate of sulfur and mercury; and the prepared adsorbing agent not only can be used for separately or jointlyremoving H2s and H in the middle temperature coal gas, but also can be used for removing mercury from other gases.

Description

technical field [0001] The invention relates to the field of medium-temperature gas purification, in particular to a method for simultaneously removing H from medium-temperature gas 2 Adsorbents for S and Hg and methods for their preparation and applications. Background technique [0002] Coal gasification is currently the most efficient and widely used clean coal technology. H still exists in crude gas 2 S, HCl, Hg and other harmful pollutants (90% of which are H 2 S), which not only causes corrosion of equipment, but also easily poisons the catalyst, and seriously endangers the environment and human health. To meet the production requirements of low emission and low pollution, the crude gas must be purified before use. Different uses of coal gasification have different requirements on the content of harmful pollutants in the gas composition. Gas used in gas turbines, H 2 The content of S needs to reach 20-100ppm; H in the synthesis gas using sulfur-resistant catalyst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/08B01J20/32C10K1/32
Inventor 韩丽娜鲍卫仁王建成吕学勇常丽萍
Owner TAIYUAN UNIV OF TECH
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