Methane-nitrogen gas double component separation method and device

A separation method and two-component technology, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of high energy consumption, resource consumption, low enrichment efficiency, etc., and achieve low equipment investment and no methane Loss, flexible effect of driving and parking

Active Publication Date: 2015-03-11
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently, CH 4 The enrichment process mainly adopts the technology of low temperature separation, membrane separation and hydrate enrichment, but there is a problem of consumption of CH 4 Resources, low enrichment efficiency and high energy consumption
which is more because of N 2 with CH 4 There are very close kinetic diameters, and they are all non-polar gases, so there is no suitable adsorbent for ordinary PSA to separate CH 4 / N 2

Method used

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  • Methane-nitrogen gas double component separation method and device
  • Methane-nitrogen gas double component separation method and device
  • Methane-nitrogen gas double component separation method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of flexible material TUTCH-1

[0025] Weigh 0.5g ± 0.001g of copper nitrate trihydrate, measure 10mL ± 0.001mL of deionized water, place in a beaker, stir and mix for 5min to form a 2mol / L copper nitrate aqueous solution;

[0026] Weigh 0.3g±0.001g of 2,5-dihydroxybenzoic acid, measure 10mL±0.001mL of deionized water, put it in a beaker, stir and mix for 5min to form a 2mol / L aqueous solution of 2,5-dihydroxybenzoic acid;

[0027] Weigh 0.312g±0.001g of 4,4'-bipyridine, measure 10mL±0.001mL of ethanol, put it in a beaker, stir and mix for 5min to form a 2mol / L 4,4'-bipyridine ethanol solution;

[0028] Measure 20mL±0.001mL of copper nitrate aqueous solution and put it in a beaker; measure 20mL±0.001mL of 2,5-dihydroxybenzoic acid aqueous solution into the beaker; measure 40mL±0.001mL of 4,4'-bipyridine ethanol solution and slowly Drop into the beaker, stir while dripping, the dropping speed is 0.5mL / min, mix evenly for 30min.

[0029] The beaker filled wit...

Embodiment 2

[0033] Preparation of flexible material TUTCH-2

[0034] Weigh 0.7g ± 0.001g of copper tetrafluoroborate hexahydrate, measure 10mL ± 0.001mL of deionized water, put it in a beaker, stir and mix for 5min, and form a 2mol / L copper tetrafluoroborate aqueous solution;

[0035] Weigh 0.312g ± 0.001g of 4,4'-bipyridine, measure 10mL ± 0.001mL of ethanol, place in a beaker, stir and mix for 5min to form a 2mol / L 4,4'-bipyridine ethanol solution.

[0036] Measure 20mL±0.001mL of copper tetrafluoroborate aqueous solution and put it in a beaker; measure 40mL±0.001mL of 4,4'-bipyridine ethanol solution and slowly drop it into the beaker, stirring while dropping, the dropping speed is 0.5mL / min, mix well for 30min.

[0037] The beaker filled with the solution was placed in a temperature-controlled magnetic stirrer, and treated at a constant temperature of 25° C. for 120 minutes; the reacted solution was kept at a constant temperature of 25° C., and sealed for 48 hours.

[0038] Filter ...

Embodiment 3

[0044] Embodiment 3 and embodiment 4 are separation CH4 / N2 method, as Figure 4 As shown, the PSA equipment used includes CH4 / N2 mixed feed gas storage tank 1, No. 1 adsorption bed 2 and No. 2 adsorption bed 3, CH4 storage tank 4 and N2 storage tank 5, and the outlet of storage tank 1 is connected to a quality control flowmeter 6 inlets, No. 1 adsorption bed 2 and No. 2 adsorption bed 3 are connected in parallel and equipped with temperature control tank 7 respectively, No. 1 adsorption bed 2 and No. 2 adsorption bed 3 are filled with flexible material TUTCH-1 or flexible material TUTCH-2 as adsorption The inlets of the two adsorption beds are connected to the outlet of the quality control flow meter 6, the outlets of the two adsorption beds are connected to the back pressure valve 8, the CH4 storage tank 4 and the N2 storage tank 5 are connected to the back pressure valve; the first adsorption bed 2 and the second adsorption bed The front and rear sides of the adsorption bed ...

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Abstract

The invention relates to a CH4 / N2 (methane / nitrogen gas) double component separation method. The method comprises the following steps: filling flexible materials TUTCH-1 and TUTCH-2 as adsorbents in an adsorption bed, controlling the constant temperatures and pressures of an inlet pipeline and the adsorption bed, and charging methane-nitrogen mixed gas to pass through the adsorption bed, so that the flexible materials adsorb methane gas to realize the purpose of separating the methane from the nitrogen gas. The device comprises a first adsorption bed and a second adsorption bed, wherein porous elastic polyethylene fiber buffer layers are arranged on the front side and the back side of the first adsorption bed and the second adsorption bed so as to effectively ensure the stabilization of a gas flow rate and the smoothness of a gas path. According to the CH4 / N2 double component separation method and device, low-concentration methane in raw gas is completely collected, no methane is lost, the device investment is smaller, a vehicle is flexible to start or stop, and the operation is simple and convenient; meanwhile, the methane can be completely removed, higher-purity nitrogen gas can be obtained, and the concentration of the collected methane gas is very high and can be up to more than 95%; methane-rich gas with the methane concentration of more than 98% can be directly applied to LNG (liquefied natural gas) fuel or CNG (compressed natural gas) for vehicles.

Description

technical field [0001] The invention relates to a gas separation technology, in particular to a methane-nitrogen two-component separation method and a used device. Background technique [0002] In recent years, the rapid development of unconventional natural gas represented by low-concentration coalbed methane (drained coalbed methane), low-saturation natural gas and shale gas has attracted worldwide attention. Occupy a pivotal strategic position in the development. These unconventional natural gas are mixed with a large amount of impurity gases such as nitrogen, carbon dioxide and water vapor during the exploitation process, among which CO 2 , N 2 The presence of will significantly reduce the CH 4 combustion efficiency. Therefore, it is particularly important to effectively enrich methane in low concentrations. [0003] Currently, CH 4 The enrichment process mainly adopts the technology of low temperature separation, membrane separation and hydrate enrichment, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/047B01J20/22B01J20/28B01J20/30C10L3/10
Inventor 李晋平李立博杨江峰王小青
Owner TAIYUAN UNIV OF TECH
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