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Method for purifying methane through pressure swing adsorption

A pressure swing adsorption and methane technology, which is applied in the direction of adsorption purification/separation, separation methods, chemical instruments and methods, etc., can solve the problem that the low rate of nitrogen adsorption can not give full play to the performance of carbon molecular sieves, the yield of carbon molecular sieves is not high, equipment investment and Problems such as high cost of use

Inactive Publication Date: 2018-05-08
CHIZHOU SHANLI MOLECULAR SIEVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the temperature is low, the nitrogen adsorption rate of carbon molecular sieve is low, and the performance of carbon molecular sieve cannot be fully exerted, resulting in a large amount of carbon molecular sieve, low yield of carbon molecular sieve, high equipment investment and use cost

Method used

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  • Method for purifying methane through pressure swing adsorption
  • Method for purifying methane through pressure swing adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, taking the feed gas with a volume content of 70% of methane and 30% of nitrogen volume content as an example, the method for extracting methane by using the above-mentioned pressure swing adsorption device includes the following steps:

[0035] Each of the adsorption towers undergoes an adsorption stage, a pressure equalization stage and a desorption stage in sequence:

[0036] (1) Adsorption stage: the raw material gas is heated to 65°C, and passed into the adsorption tower through the inlet end of the adsorption tower, the raw material gas passes through the adsorbent, and the nitrogen in the raw material gas is absorbed by the adsorption Agent adsorption, the outlet end of the adsorption tower discharges product gas; the adsorption stage time is 1min;

[0037] (2) Pressure equalization stage: after the adsorption stage ends, the adsorption tower performs a pressure equalization operation with another adsorption tower in the desorption stage throug...

Embodiment 2

[0042] In this embodiment, taking the feed gas with a volume content of 70% of methane and 30% of nitrogen volume content as an example, the method for extracting methane by using the above-mentioned pressure swing adsorption device includes the following steps:

[0043] Each of the adsorption towers undergoes an adsorption stage, a pressure equalization stage and a desorption stage in sequence:

[0044] (1) Adsorption stage: the raw material gas is heated to 40°C, passed into the adsorption tower through the inlet end of the adsorption tower, the raw material gas passes through the adsorbent, and the nitrogen in the raw material gas is absorbed by the adsorption Agent adsorption, the outlet end of the adsorption tower discharges product gas; the adsorption stage time is 2min;

[0045] (2) Pressure equalization stage: after the adsorption stage ends, the adsorption tower performs a pressure equalization operation with another adsorption tower in the vacuum stage through the ou...

Embodiment 3

[0050] In this embodiment, taking landfill gas (with methane volume content of 70% and nitrogen volume content of 30%) as an example, the method for extracting methane from the above-mentioned pressure swing adsorption device includes the following steps:

[0051] Each of the adsorption towers undergoes an adsorption stage, a pressure equalization stage and a desorption stage in sequence:

[0052] (1) Adsorption stage: the raw material gas is heated to 100°C, and passed into the adsorption tower through the inlet end of the adsorption tower, the raw material gas passes through the adsorbent, and the nitrogen in the raw material gas is absorbed by the adsorption Agent adsorption, the outlet end of the adsorption tower discharges product gas; the adsorption stage time is 30s;

[0053] (2) Pressure equalization stage: after the adsorption stage ends, the adsorption tower performs a pressure equalization operation with another adsorption tower in the vacuum stage through the outle...

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Abstract

The invention relates to a method for purifying methane through pressure swing adsorption. A pressure swing adsorption device is adopted for purifying methane in feed gas; the pressure swing adsorption device comprises at least two adsorption towers with adsorbent; the feed gas contains methane, nitrogen and other gas, the volume percentage of methane is larger than 50%, and the volume percentageof nitrogen is smaller than 40%. The method includes the step that adsorption-stage treatment, pressure-equalization-stage treatment and desorption-stage treatment are carried out in each adsorption tower in sequence. According to the method for purifying methane through pressure swing adsorption, the pressure swing adsorption device is adopted for purifying methane in the feed gas; by heating thefeed gas to 40-120 DEG C, the nitrogen adsorption efficiency can be improved, and a certain adsorption capacity and separation efficiency can be guranateed.

Description

technical field [0001] The invention relates to the technical field of separation and purification of gas mixtures, in particular to a method for purifying methane by pressure swing adsorption. Background technique [0002] In the separation of methane / nitrogen, carbon molecular sieves can be used as adsorbents to absorb and remove nitrogen. Carbon molecular sieves are speed separation molecular sieves, which rely on the different adsorption rates of gases on molecular sieves to separate and purify gases. The higher operating temperature of conventional pressure swing adsorption devices will reduce the performance of the adsorbent, so it is usually best to keep the raw gas at room temperature or low temperature. [0003] The nitrogen adsorption performance of carbon molecular sieve is related to temperature, the ambient temperature changes, and the equipment process performance is unstable. When the temperature is low, the nitrogen adsorption rate of the carbon molecular s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/047C07C7/13C07C9/04
CPCB01D53/047B01D2253/102B01D2256/245B01D2257/104B01D2257/108B01D2257/502B01D2257/504B01D2257/7022C07C7/13C07C9/04Y02C20/40Y02E50/30
Inventor 胡耀明汤历斌
Owner CHIZHOU SHANLI MOLECULAR SIEVE