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A kind of method of trace potassium hydroxide modified activated carbon-based propane adsorbent

A potassium hydroxide and activated carbon technology, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as increasing cost and difficulty in large-scale production, and achieve the effects of easy to scale up production, low raw material cost, and simple operation

Active Publication Date: 2018-01-16
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, surface modification can indeed optimize the adsorption performance of activated carbon-based adsorbents, but the above-mentioned modifications require a large amount of modifying reagents, and some require high-pressure and high-temperature reaction conditions, which undoubtedly greatly increase the cost and the cost of large-scale production. difficulty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Immerse 20 g of monolithic coal-based activated carbon (150 mesh) vertically in 83 mmol / L KOH aqueous solution for 10 min, turn over and soak again for 10 min, take it out, blow it with an air compressor to remove excess potassium hydroxide solution, and blow it at 50 °C. Dry in an air drying oven.

[0016] Adsorption performance evaluation: The propane concentration in the feed gas is 10-12 ppm, the balance gas is air, and the gas flow rate is 1000mL / min. Product analysis was performed using a total hydrocarbon analyzer (Thermo, Model 51i) with a minimum detection limit of 0.05 ppmc.

[0017] The test results show that the initial purification rate of propane by the modified activated carbon-based propane adsorbent is greater than 99%, and the average purification rate within 197 minutes is greater than 70%.

Embodiment 2

[0019] Immerse 20 g of monolithic coal-based activated carbon (150 mesh) vertically in 28 mmol / L KOH aqueous solution for 10 min, turn over and soak for 10 min again, take it out, blow it with an air compressor to remove excess potassium hydroxide solution, and set the temperature at 50 °C for 10 min. Dry in an air drying oven.

[0020] Adsorption performance evaluation is the same as in Example 1. The test results show that the initial purification rate of propane by the modified activated carbon-based propane adsorbent is greater than 99%, and the average purification rate within 221 minutes is greater than 70%.

Embodiment 3

[0022] Immerse 20 g of monolithic coal-based activated carbon (150 mesh) vertically in 9 mmol / L KOH aqueous solution for 10 min, turn it upside down and soak again for 10 min, take it out, and blow it with an air compressor to remove excess potassium hydroxide solution. Dry in an air drying oven.

[0023] Adsorption performance evaluation is the same as in Example 1. The test results show that the initial purification rate of propane by the modified activated carbon-based propane adsorbent is greater than 99%, and the average purification rate within 226 minutes is greater than 70%.

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PUM

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Abstract

The invention discloses a method for modifying an activated carbon-based propane adsorbent with a trace amount of potassium hydroxide. Immerse the monolithic coal-based activated carbon vertically in a 1-100 mmol / L potassium hydroxide solution for 10 minutes, turn it over and soak for another 10 minutes, take it out, blow it with an air compressor to remove excess potassium hydroxide solution, and blast at 50 °C Made by drying in a drying oven. The propane adsorption performance of the obtained activated carbon-based adsorbent was greatly improved compared with untreated coal-based activated carbon. The invention is characterized in that the raw materials are easy to obtain, the process is simple, the cost is low, and it has good application prospects.

Description

technical field [0001] The invention relates to the technical field of adsorption materials, in particular to a method for modifying an activated carbon-based propane adsorbent with a trace amount of potassium hydroxide. Background technique [0002] Activated carbon materials are widely used as industrial adsorbents because of their rich pore structure, large specific surface area, and strong adsorption capacity. The existing adsorption process is more aimed at higher concentration of adsorbate (above several thousand ppm), and there is no need to consider the selectivity of the adsorbent too much. However, a dozen or several ppm of polluting gases in the ambient atmosphere is enough to cause serious air pollution problems. Under such working conditions, commercial activated carbon often fails to achieve the expected effect. Therefore, there is an urgent need to develop an activated carbon-based adsorption material that still has a high-efficiency adsorption effect under e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
Inventor 何丹农赵昆峰袁静蔡婷高振源杨玲张涛
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH