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Modified natural stilbite used as methane adsorbent, and preparation method thereof

A technology of pyroxene and adsorbent, which is applied in the field of modified natural pyroxene and its preparation, can solve the problems of explosion, combustion, and danger of activated carbon, and achieves the effects of wide application prospect, high quality and low cost

Inactive Publication Date: 2014-01-08
FUDAN UNIV
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  • Abstract
  • Description
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Problems solved by technology

But we know that activated carbon itself is a kind of porous carbon material, the surface is very easy to accumulate charges, and at the same time it is extremely flammable in the air. It is very easy to cause the system to burn or explode
In fact, a serious explosion occurred in a large coal mine in China in the model experiment of using activated carbon for gas enrichment, which shows that activated carbon is very dangerous in gas purification and cannot be used as a methane adsorbent for gas Enrichment and recovery of methane in gas

Method used

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  • Modified natural stilbite used as methane adsorbent, and preparation method thereof
  • Modified natural stilbite used as methane adsorbent, and preparation method thereof
  • Modified natural stilbite used as methane adsorbent, and preparation method thereof

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[0022] Further describe the present invention by embodiment below:

[0023]

[0024] Taking Example 1 as an example, first prepare 0.1 mol / L NH 4 Cl solution, the pulverized STI zeolite raw powder was exchanged at 80°C for 4 times at a solid-to-liquid ratio of 1:10, each time for 2 h, after drying, it was treated with water vapor in a tube furnace at 200°C for 3 h, and then At 0.1 mol / L MgCl 2 The solution was exchanged four times at 80°C with a solid-to-liquid ratio of 1:10, each time for 2 hours, and dried to obtain the STI zeolite methane adsorbent of the present invention. When P / P0=1.0, the methane adsorption capacity is 21.5 mL / g, while the nitrogen adsorption capacity is 7.0 mL / g, and the separation coefficient of the two is higher than 3. See figure 1 , figure 2 shown. The STI zeolite hollow glass adsorbents obtained in the remaining examples all have similar properties.

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Abstract

The invention belongs to the technical field of chemical adsorbent, and specifically relates to modified natural stilbite used as a methane adsorbent, and a preparation method thereof. According to the invention, natural STI zeolite is adopted as a raw material, and is subject to ammonium solution exchange, such that NH4-STI zeolite is obtained; the NH4-STI zeolite is subject to high-temperature steam processing, such that H-STI zeolite is obtained; the H-STI zeolite is subject to magnesium ion exchange, such that magnesium-type STI (Mg-STI) zeolite is obtained. Methane adsorption capacity of the absorbent can reach 21.5mL / g, and a methane / nitrogen separation coefficient of the absorbent is higher than 3, such that the adsorbent can be adopted as an excellent high-efficiency methane adsorbent. Natural mineral resources adopted in the invention are advantaged in high grade, abundant reserves, and low exploitation cost. Also, the STI zeolite methane adsorbent preparation method is advantaged in simple technology and relatively low cost. The absorbent has a wide application prospect in gas separation and extraction in coal mines.

Description

Technical field [0001] The present invention is a chemical adsorption technology field, and it involves a modified natural cannite and preparation method for methane adsorption agents. Background technique [0002] Gas gas is also known as biogas, and 95%of its composition is methane gas (CH 4 ), Also contain a small amount of carbon monoxide, carbon dioxide, etc., is the most common harmful gas in coal mines.The greenhouse effect produced by methane is 21 times the carbon dioxide, which also has the characteristics of colorlessness, odorlessness, odorlessness, non -toxic and other characteristics; density is smaller than air, gathered above the coal mine lane, and when it is high in the airCaused by suffocation; it is explosive, and the explosion concentration is generally 5 ~ 16%.my country's coalbed methane reserves are 3.68 trillion cubic meters, which is equivalent to 45 billion tons of standard coal or 35 billion tons of standard oil. It is equivalent to the reserves of con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18B01J20/28B01J20/30C07C7/12C07C9/04
Inventor 程晓维龙英才
Owner FUDAN UNIV
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