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A kind of adsorbent for removing mercury from natural gas and its preparation method

An adsorbent and natural gas technology, applied in chemical instruments and methods, gas fuels, and other chemical processes, can solve problems such as unstable pore volume and pore size, large amount of mercury removal agent, and small mercury capacity, etc., to achieve Fast mercury removal speed, stable pore volume and channel size, and large mercury capacity

Active Publication Date: 2019-12-31
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of poor carrier strength, unstable specific surface, pore volume and pore size, slow mercury removal speed, small mercury capacity, and relatively large usage of mercury removal agent in existing mercury removal agents, and provide a A new preparation method of mercury removal agent

Method used

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  • A kind of adsorbent for removing mercury from natural gas and its preparation method
  • A kind of adsorbent for removing mercury from natural gas and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] At room temperature, dissolve 5g of sulfur in 70mL of carbon disulfide to make a carbon disulfide-sulfur solution, take 100g of it, the diameter is 2mm, and the pore volume is 0.3cm 3 / g, the specific surface area is 130m 2 / g γ-Al 2 o 3 The particles were soaked in the above sulfur solution, filtered after 2 hours, and dried at 50°C until constant weight, with a mass of 104.0g. Then use 80mL concentration of 10% copper sulfate pentahydrate solution to impregnate the above γ-Al 2 o 3 The particles were filtered after 30 minutes and dried at 105°C until constant weight, with a mass of 109.7g. Put the above product into a glass reaction tube, pass H at 60°C 2 S gas, make copper sulfate and H 2 S reacts to form copper sulfide, which is taken out, washed with deionized water to remove sodium sulfate, and then dried at 100°C to obtain the product.

Embodiment 2

[0022] The mercury removal adsorbent prepared in Example 1 above was loaded into a natural gas mercury removal adsorption evaluation device for evaluation. The mercury content of natural gas reaches 199μg / m by supplementing mercury 3 .

[0023] The residence time is 3s, the operating pressure is 6Mpa, and the mercury concentration is 199μg / m 3 , the liquid hydrocarbon content is 5ppm, and the free water content is 20ppm, the effect of temperature on mercury removal is investigated. The experimental results are shown in Table 1.

[0024] Table 1 Effect of temperature on mercury removal effect

[0025]

[0026] The results show that when the residence time is 3s, the operating pressure is 6Mpa, and the mercury concentration is 199μg / m3 at 10-55℃ 3 Can be reduced to not higher than 0.362μg / m 3 .

[0027] At a temperature of 25°C, a residence time of 3s, an operating pressure of 6Mpa, a free water content of 20ppm, a liquid hydrocarbon content of 5ppm, and a mercury conce...

Embodiment 3

[0032] 100g has a diameter of 2mm and a pore volume of 0.3cm 3 / g, the specific surface area is 130m 2 / g γ-Al 2 o 3 The measured water absorption rate is 60%. After drying at 105°C, soak it in 75mL of 10% sulfur solution for 2 hours and filter it; The solution was impregnated for 30min, then filtered, dried at 105°C to constant weight, the mass was 110.6g, and then 0.03mol / L Na 2 S solution is vulcanized; soaked for 24 hours, filtered, washed with deionized water to remove sodium nitrate, and dried at 110°C to obtain a natural gas mercury removal adsorbent. Put the mercury removal adsorbent on the fixed bed reactor, at room temperature, feed 199ug / m 3 The mercury-containing natural gas was finally measured to have a mercury capacity of 8.6%.

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Abstract

The invention discloses a natural gas demercuration adsorbent and a preparation method. The natural gas demercuration adsorbent comprises the following components in parts by mass: 82-95% of Al2O3, 4-12% of sulfur and 1-6% of copper sulfide. The preparation method comprises the following steps: (1) dipping Al2O3 in a sulfur solution; (2) soaking the product of the step (1) with a dissoluble copper solution; (3) exposing the product of the step (2) in a vulcanization environment for vulcanization; (4) washing with deionized water; (5) drying, thereby obtaining the natural gas demercuration adsorbent. The natural gas demercuration adsorbent prepared according to the preparation method disclosed by the invention is high in carrier strength, stable in specific surface, pore volume and pore size, high in demercuration speed, large in mercury capacity and small in use amount.

Description

technical field [0001] The invention relates to a mercury removal adsorbent and a preparation method, in particular to a natural gas mercury removal adsorbent and a preparation method. Background technique [0002] Natural gas often contains elemental mercury, a common non-hydrocarbon gaseous component of natural gas. Although its content is very small, it can still cause corrosion and leakage of aluminum plate-fin heat exchangers in the low-temperature systems of natural gas liquefaction, condensate recovery, and denitrification devices, which is extremely harmful. If the stream contains water, the water will chemically react with the amalgam to accelerate corrosion, so the mercury must be removed prior to the above process. Natural gas mercury removal methods include fixed-bed adsorption method, low-temperature separation method, solution absorption method and membrane separation method. Fixed-bed adsorption method is currently the main industrialized process method, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/08B01J20/30C10L3/10
CPCB01J20/0237B01J20/0285B01J20/08C10L3/101
Inventor 林富荣仲艳艳
Owner CHANGZHOU UNIV
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