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Preparation method of high-efficiency adsorbent for separating nitrogen and methane

A technology of adsorbent and methane, which is applied in the field of preparation of high-efficiency adsorbents, can solve the problems of unsatisfactory concentration effect, low equilibrium separation coefficient, uneconomical engineering application, etc., and achieves mild preparation conditions, good desorption performance and low preparation cost. low effect

Inactive Publication Date: 2018-12-14
HENAN HUANYU PETROCHEM EQUIP TECH CO LTD
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  • Abstract
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Problems solved by technology

[0005] The above domestic research results show that activated carbon (or modified activated carbon) can separate CH in PSA 4 / N 2 Some achievements have been made in this aspect, but it is still limited to the stage of theoretical research in the laboratory. CH 4 The concentration effect is not very ideal, because activated carbon is based on the principle of equilibrium separation, CH 4 / N 2 The equilibrium separation coefficient is not high, although increasing the number of cycles can increase the CH 4 Concentration, but consumes power costs, uneconomical for engineering applications

Method used

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  • Preparation method of high-efficiency adsorbent for separating nitrogen and methane

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Effect test

Embodiment 1

[0020] Weigh 50.1g of activated carbon molecular sieve, put it in a closed furnace under vacuum conditions, gradually raise the temperature to 120°C, and keep it for 2 hours; gradually introduce CO into the closed furnace 2 Gas, gradually warming up to 250 °C, during which CO is always introduced 2 gas, let CO 2 The gas flows in the furnace, and it can be recycled in industrial production. After heating for 3 hours, stop heating, and the adsorbent is in CO 2 Naturally cooled to room temperature in the atmosphere, samples were taken for testing.

[0021] This adsorbent was packed in a fixed bed adsorber. Fixed bed adsorbers operate at room temperature. Pass 30%CH 4 +70%N 2, the adsorption pressure is 50KPa, after the pressure swing adsorption process, the CH in the product gas 4 The concentration is 85%, and the yield of methane is 72%.

Embodiment 2

[0023] Weigh 70.8g of activated carbon molecular sieve, put it in a closed furnace under vacuum condition, gradually raise the temperature to 150°C, and keep it for 2 hours; gradually introduce CO into the closed furnace 2 Gas, gradually warming up to 250 °C, during which CO is always introduced 2 gas, let CO 2 The gas flows in the furnace and can be recycled in industrial production. After heating for 3 hours, stop heating. Adsorbent in CO 2 Naturally cooled to room temperature in the atmosphere, samples were taken for testing.

[0024] This adsorbent was packed in a fixed bed adsorber. Fixed bed adsorbers operate at room temperature. Pass 30%CH 4 +70%N 2 , the adsorption pressure is 50KPa, after the pressure swing adsorption process, the CH in the product gas 4 The concentration is 88%, and the yield of methane is 71%.

Embodiment 3

[0026] Weigh 58.6g of activated carbon molecular sieve, put it in a closed furnace under vacuum condition, gradually raise the temperature to 150°C, and keep it for 2 hours; gradually introduce CO into the closed furnace 2 Gas, gradually warming up to 280 °C, during which CO is always introduced 2 gas, let CO 2 The gas flows in the furnace and can be recycled in industrial production. After heating for 3 hours, stop heating. Adsorbent in CO 2 Naturally cooled to room temperature in the atmosphere, samples were taken for testing.

[0027] This adsorbent was packed in a fixed bed adsorber. Fixed bed adsorbers operate at room temperature. Pass 30%CH 4 +70%N 2 , the adsorption pressure is 50KPa, after the pressure swing adsorption process, the CH in the product gas 4 The concentration is 92%, and the yield of methane is 68%.

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Abstract

The invention belongs to the technical field of gas separation in the field of chemical industry, and specifically discloses a preparation method of a high-efficiency adsorbent for separating nitrogenand methane. The preparation method includes the steps: activating an activated carbon molecular sieve at the temperature of 100-180 DEG C for 1-3 h under a vacuumization condition; expanding holes of the activated carbon molecular sieve after activation at the temperature of 250 DEG C or more for 2-4 h in a CO2 atmosphere; and then, cooling to room temperature in a CO2 atmosphere to obtain the high-efficiency adsorbent for separating nitrogen and methane. The prepared high-efficiency adsorbent can purify low-concentration methane gas under a condition of normal temperature by a pressure swing adsorption principle, and is mainly used for separating nitrogen and methane.

Description

technical field [0001] The invention belongs to the technical field of gas separation in the chemical industry, and in particular relates to a preparation method of an efficient adsorbent for separating nitrogen-methane. Background technique [0002] Methane (CH 4 ) is an efficient and clean energy and chemical raw material, as well as a greenhouse effect gas. 4 The use of energy can effectively improve the energy structure and reduce greenhouse gas emissions. To efficiently utilize the methane in these resources, the premise is to enrich the methane. The pressure swing adsorption process has become the most concerned CH due to its advantages of flexible and convenient operation, low investment and good performance. 4 Concentration technology. PSA Concentrated CH 4 Mainly based on the principle of kinetic effect or equilibrium effect, if the ratio of the diffusion coefficients of the two gases reaches more than 30-50 or the ratio of the equilibrium separation coefficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01D53/02B01J20/30
CPCB01D53/02B01J20/20Y02C20/20
Inventor 勾华杰林志鹏姜卫东曹治明田伟陈志强岳建新
Owner HENAN HUANYU PETROCHEM EQUIP TECH CO LTD
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