Natural gas demercuration adsorbent and preparation method thereof

Abstract

The invention discloses a natural gas demercuration adsorbent and a preparation method thereof. The natural gas demercuration adsorbent consists of 70 to 90 percent by weight of Al2O3, 2 to 8 percentby weight of active carbon, 6 to 15 percent by weight of copper sulphide and 4 to 12 percent by weight of total sulfur. The preparation steps are as follows: (1) Al2O3-AC composite carrier is pelletized; (2) the product in step (1) is soaked in sulfur solution; (3) the product in step (2) is soaked in soluble copper salt solution; (4) the product in step (3) is exposed to be vulcanized in a vulcanization environment; (5) deionized water is used for washing; (6) after drying, the natural gas demercuration adsorbent is obtained. According to the preparation method provided by the invention, thecomposite carrier which is prepared by adding active carbon in alumina carrier improves pore size and enlarges specific surface; since an S, CuS and CuSx multi-component active substance is carried bythe carrier, not only is the demercuration speed of mercury-removing agent with copper sulphide as an active substance improved, but also the loss of elemental sulfur can be prevented, rapid and stable demercuration is realized, and the mercury capacity is increased as well.

Description

technical field

[0001] The invention relates to a mercury-removing adsorbent and a preparation method thereof, in particular to a novel natural gas mercury-removing adsorbent and a preparation method thereof. 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 industriali...

Examples

Embodiment 1

[0022] (1) Mercury removal adsorbent Al 2 o 3 Preparation of -AC-CuS-S and its determination of mercury capacity

[0023] Take 90g of 3~4mm Al 2 o 3 -AC composite carrier particles, dried at 105°C to constant weight. Will Al 2 o 3 -AC composite support was impregnated in 150mL CS with 5% S content 2 The solution was soaked for 2 hours, filtered and baked in an oven at 50°C for 3 hours, and the calculated elemental sulfur loading was 4.39g. Then use Cu 2+ 150mL Cu(NO 3 ) 2 ·3H 2 O solution impregnated the above-mentioned sulfur-containing carrier for 2h, filtered and dried, and calculated Cu 2+ The loading was 9.24 g. Take Na again 2 S·9H 2 Add O into water, dissolve and prepare 150mL Na with a concentration of 65% at 80°C 2 S·9H 2 O solution, will be impregnated with Cu 2+ The composite support impregnated in the above Na 2 S solution for 2h, filtered, washed with water and dried to obtain Al 2 o 3 -AC-CuS-S adsorbent for mercury removal, the calculated CuS...

technical field

[0001] The invention relates to a mercury-removing adsorbent and a preparation method thereof, in particular to a novel natural gas mercury-removing adsorbent and a preparation method thereof. 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 industriali...

Examples

Embodiment 1

[0022] (1) Mercury removal adsorbent Al 2 o 3 Preparation of -AC-CuS-S and its determination of mercury capacity

[0023] Take 90g of 3~4mm Al 2 o 3 -AC composite carrier particles, dried at 105°C to constant weight. Will Al 2 o 3 -AC composite support was impregnated in 150mL CS with 5% S content 2 The solution was soaked for 2 hours, filtered and baked in an oven at 50°C for 3 hours, and the calculated elemental sulfur loading was 4.39g. Then use Cu 2+ 150mL Cu(NO 3 ) 2 ·3H 2 O solution impregnated the above-mentioned sulfur-containing carrier for 2h, filtered and dried, and calculated Cu 2+ The loading was 9.24 g. Take Na again 2 S·9H 2 Add O into water, dissolve and prepare 150mL Na with a concentration of 65% at 80°C 2 S·9H 2 O solution, will be impregnated with Cu 2+ The composite support impregnated in the above Na 2 S solution for 2h, filtered, washed with water and dried to obtain Al 2 o 3 -AC-CuS-S adsorbent for mercury removal, the calculated CuS...

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