CN1150966C - Variable adsorption process for separating methane/nitrogen gas mixture with large-surface activated carbon - Google Patents
Variable adsorption process for separating methane/nitrogen gas mixture with large-surface activated carbon Download PDFInfo
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- CN1150966C CN1150966C CNB021179166A CN02117916A CN1150966C CN 1150966 C CN1150966 C CN 1150966C CN B021179166 A CNB021179166 A CN B021179166A CN 02117916 A CN02117916 A CN 02117916A CN 1150966 C CN1150966 C CN 1150966C
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Abstract
The present invention discloses method for separating a mixture of methane and nitrogen by pressure swing adsorption, which uses high surface active carbon as a separation adsorption agent. The method has the core that high surface active carbon is used for enlarging the difference of adsorption capability of methane and nitrogen, a separation coefficient required by the pressure swing adsorption is reached, and the separation of the methane and the nitrogen is realized by a pressure swing adsorption technology. The technology of separating the methane and the nitrogen is carried out at an ordinary temperature and under the pressure of 1.0MPa, and therefore, the energy consumption and the cost are low. The present invention can be used for separating methane/nitrogen in technological gas, exploiting coal seam gas, increasing heat values of marsh gas, lowering gas density in coal mines, etc.
Description
Technical field
The present invention relates to the separation method of a kind of methane and nitrogen mixture, belong to gas separation.
Background technology
In many natural fuel gas, methane is Main Ingredients and Appearance, and nitrogen is major impurity.Many industrial gas are as the same, and the separation of the two is very important.For the nitrogen in the industrial gas/methane separation requirement, generally by next step procedure decision.With regard to natural gas flow, nitrogen/methane separation is one of key technology for China's development and use coal bed gas.The content of methane does not wait in the coal bed gas, and gas production is successively decreased in time.If can easily methane be separated with impurity, not only can promote the calorific value of coal bed gas, and be convenient to propose the accumulating of dense back coal bed gas.Wherein nitrogen is the composition of difficult separation in the major impurity.Equally, the methane content as flammable composition in the biogas has only about 50%, and major impurity is nitrogen and carbon dioxide.If can improve the methane content in the biogas, then will improve the calorific value of biogas greatly, also be convenient to accumulating the biogas of large-scale production.Carbon dioxide is relatively easy with separating of methane, but nitrogen was difficult to separating then of methane.
The critical-temperature of nitrogen and methane is all very low.Chemical property is stable, and physical property is close, therefore is difficult to separate at low cost.Transformation absorption is minimum, the most cheap separation method of energy consumption, and problem is to locate a kind of suitable adsorbent.The outstanding recently literary composition of internationally famous absorption scholar Rutheven points out that developing effective nitrogen/methane separation adsorbent is a challenge that faces, the as seen difficulty of this separation task.
Summary of the invention
For realizing transformation adsorbing separation nitrogen and methane mixture cheaply, this patent adopts high surface activity carbon as adsorbent, has reached the separation requirement of pressure swing adsorption technique to adsorbent.Utilize pressure swing adsorption technique separation of nitrogen/methane mixture, by the transformation sorption cycle, realization nitrogen separates with methane.Be used to purify the common adsorbent of purpose except that filling in adsorption tower, the filling specific area is at 1700m
2/ g is above, based on the high surface activity carbon of micropore separating adsorbent as nitrogen and methane.In the transformation sorption cycle, adsorptive pressure is at 0.4-1.0MPa, and desorption pressure is normal pressure.
The present invention is realized by following proposal.In the transformation adsorption process, no matter adopt several adsorption towers, in the tower all with the separating adsorbent of high surface activity carbon as methane/nitrogen.By the absorption under elevated pressures, nitrogen separation is come out, by the desorb under lower pressure, the methane desorption is come out, and realize the regeneration of adsorbent.For making adsorbent reactivation complete, it is adsorbent bed that employing nitrogen flows reverse purging.
The invention has the advantages that: 1, by adopting the separating adsorbent of high surface activity carbon as methane/nitrogen, making the employing pressure swing adsorption technique separate this becomes possibility to key component.2, because adopt the transformation adsorptive separation technology, make that the separation costs of methane/nitrogen is cheap.
The specific embodiment
For example adopt a 4-tower transformation adsorption process, the filling high surface activity carbon is applied to the methane enrichment of low methane content coal bed gas as the separating adsorbent of methane/nitrogen in the adsorption tower.Coal bed gas (for example 0.4MPa) under certain pressure through super-dry enters the adsorption tower bottom, and cat head flows out nitrogen.After the adsorption step, reduce adsorption column pressure, deviate from the methane of absorption to normal pressure.Under normal pressure, utilize the reverse purging adsorbent bed of gained nitrogen, improve the adsorbent reactivation degree of depth, so that begin next adsorption step.
Claims (1)
1. the method for a high surface activity carbon pressure swing adsorption/separation of methane/nitrogen mixture is characterized in that, is used to purify the common adsorbent of purpose except that filling in adsorption tower, also loads specific area at 1700m
2/ g is above, based on the high surface activity carbon of micropore separating adsorbent as nitrogen and methane, adsorptive pressure is 0.4-1.0MPa, desorption and be aided with the nitrogen purging and make adsorbent reactivation under normal pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021179166A CN1150966C (en) | 2002-05-23 | 2002-05-23 | Variable adsorption process for separating methane/nitrogen gas mixture with large-surface activated carbon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021179166A CN1150966C (en) | 2002-05-23 | 2002-05-23 | Variable adsorption process for separating methane/nitrogen gas mixture with large-surface activated carbon |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1390627A CN1390627A (en) | 2003-01-15 |
| CN1150966C true CN1150966C (en) | 2004-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021179166A Expired - Fee Related CN1150966C (en) | 2002-05-23 | 2002-05-23 | Variable adsorption process for separating methane/nitrogen gas mixture with large-surface activated carbon |
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| CN (1) | CN1150966C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399354A (en) * | 2014-12-13 | 2015-03-11 | 太原理工大学 | Methane-nitrogen gas double component separation method and device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101724479B (en) * | 2009-11-30 | 2013-05-08 | 昆明理工大学 | Method for pressure swing adsorption and concentration of methane |
| CN102897797B (en) * | 2012-04-27 | 2015-10-07 | 李宽义 | Coal-seam gas is utilized to produce the environment-friendly clean process method of prussic acid derivative |
| CN103205297A (en) * | 2013-04-15 | 2013-07-17 | 西南化工研究设计院有限公司 | Method for separating and purifying coal mine methane (CMM) in mine areas by using pressure swing adsorption (PSA) process |
| CN106345410B (en) * | 2016-09-30 | 2019-05-31 | 太原理工大学 | A kind of methane/nitrogen separation carbon adsorbent and preparation method thereof |
-
2002
- 2002-05-23 CN CNB021179166A patent/CN1150966C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399354A (en) * | 2014-12-13 | 2015-03-11 | 太原理工大学 | Methane-nitrogen gas double component separation method and device |
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| Publication number | Publication date |
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| CN1390627A (en) | 2003-01-15 |
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Granted publication date: 20040526 |