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Preparation method and use of carbon molecular sieve

A technology of carbon molecular sieves and uses, which is applied in chemical instruments and methods, nitrogen purification/separation, and other chemical processes, and can solve problems such as difficult to efficiently separate methane-nitrogen

Inactive Publication Date: 2011-01-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a carbon molecular sieve that adopts a secondary activation method to directly purify methane from coalbed methane. The Problem of Separating Methane-Nitrogen

Method used

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Examples

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Effect test

Embodiment 1

[0034] A kind of carbon molecular sieve that adopts secondary activation method to directly purify methane from coal bed gas comprises the following steps:

[0035] (1) Select anthracite (or coconut shell or phenolic resin) as the raw material, pulverize the raw material, pass the pulverized raw material through a 200-mesh sieve for later use; then, add coal tar for extrusion molding; place it in a tubular reactor after molding Carry out carbonization, carbonization is carried out in nitrogen with a purity greater than 99.9%, the carbonization temperature is between 400°C and 700°C, the carbonization time is 1 hour, and the temperature rise rate is controlled at 5°C·min -1 , to remove the volatile components in it; after the carbonization is completed, steam activation is carried out. The temperature of the steam activation process is 800 ° C ~ 1000 ° C, and the activation time is 45 minutes; finally, under the condition of 700 ° C ~ 900 ° C, the consumption per gram of raw mater...

Embodiment 2

[0039] A kind of carbon molecular sieve that adopts secondary activation method to directly purify methane from coal bed gas comprises the following steps:

[0040] (1) Select anthracite (or coconut shell or phenolic resin) as the raw material, pulverize the raw material, pass the pulverized raw material through a 200-mesh sieve for later use; then, add coal tar for extrusion molding; place it in a tubular reactor after molding Carry out carbonization, carbonization is carried out in nitrogen with a purity greater than 99.9%, the carbonization temperature is between 400°C and 700°C, the carbonization time is 1 hour, and the temperature rise rate is controlled at 5°C·min -1 , to remove the volatile components in it; after the carbonization is completed, steam activation is carried out. The temperature of the steam activation process is 800 ° C ~ 1000 ° C, and the activation time is 45 minutes; finally, under the condition of 700 ° C ~ 900 ° C, the consumption per gram of raw mat...

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Abstract

The invention relates to a preparation method and use of a carbon molecular sieve. The preparation method comprises the following steps: preparing a conventional carbon molecular sieve; and expanding the pores in the conventional carbon molecular sieve by using a secondary activation technique and modifying the conventional carbon molecular sieve by adjusting the pores. The new carbon molecular sieve is prepared by using coal, coconut shell or phenolic resin, and the like as raw materials, by the conventional production steps of crushing, forming, carbonizing, steam activating, hydrocarbon settling and shrinking and the like and by secondary activation with KOH or CO2 as an activator. The activation temperature is between 550 and 850 DEG C; and the ignition loss rate of the product is kept be between 0.1 and 30 percent. In aspect of use, the carbon molecular sieve can be used for absorbing nitrogen molecules and can also be used for absorbing and separating methane and nitrogen in seam gas under a variable pressure while achieving an adsorption dynamic separation effect and allowing high-concentration methane gas to be collected at the exit of an adsorption tower directly; and thus, the methane in the seam gas can be used efficiently.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a production method of a carbon molecular sieve for directly purifying methane from coal bed gas. The modified new carbon molecular sieve obtained according to the production method shows the preference of nitrogen adsorption, and is used in the application of pressure swing adsorption technology , Coalbed methane passes through the fixed bed filled with modified carbon molecular sieve, nitrogen is preferentially adsorbed, methane permeates directly from the bed, so as to realize the enrichment of methane gas. Background technique [0002] With the improvement of people's awareness of coal mine safety and environmental protection, the development and utilization of coalbed methane have been attached great importance both at home and abroad in recent years. As an efficient and clean energy, coalbed methane contains relatively few impurities except air. The composition of coalbed methane aft...

Claims

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Application Information

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IPC IPC(8): C01B31/02B01J20/20C01B21/04C07C9/04C07C7/12
Inventor 李明戚寅黄海仙任英张维华陶永涛
Owner TONGJI UNIV
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