Adsorbent for separating nitrogen and methane and its preparation method and application
A technology of adsorbent and methane, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problem of low separation efficiency of traditional CMS, and achieve the effect of simple and controllable preparation method, low cost and low energy consumption
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[0021] The preparation method of the adsorbent used for separating nitrogen methane in the present invention comprises the following steps: after the carbon molecular sieve is impregnated with a polymer solution, solid-liquid separation is performed, and the solid is dried to obtain the adsorbent for separating nitrogen methane; wherein, the The polymer solution contains polyvinyl alcohol and polyethylene glycol, and the weight ratio of polyvinyl alcohol and polyethylene glycol is 1:0.5-10.
[0022] The study found that the use of polyvinyl alcohol and polyethylene glycol as modifiers for modification, PVA and PEG cooperate with each other and synergistically synergize, and the pore size of carbon molecular sieve can be adjusted to achieve partial pore adjustment, making it in the carbon molecular sieve. When separating gases, the effect of shape selection occurs, especially when separating N 2 / CH 4 when, CH 4 The molecular dynamics diameter of 0.38 nm, N 2 The molecular d...
Embodiment 1
[0037] Adopt the following method to prepare the adsorbent for separating nitrogen methane:
[0038] 1) Configure a mixed solution of a certain concentration: under the condition of 90 ° C, mix a certain amount of PVA and PEG with deionized water, wherein the weight ratio of PVA and PEG is 1:3, and then stir it, Make it completely dissolved in water to obtain a mixed solution, and control the amount of deionized water added so that the total concentration of PVA and PEG in the mixed solution is 1wt%;
[0039] 2) Fully mix and stir the ground carbon molecular sieve (40-60 mesh) and the mixed solution, then carry out suction filtration and separation, and dry the filtered solid overnight at 150° C. to obtain the final product for nitrogen separation. Sorbent samples for methane.
[0040] The adsorption capacity of the modified sample for nitrogen and methane was determined by static adsorption method. The specific measurement method is as follows:
[0041] like figure 1 As s...
Embodiment 2
[0064] Adopt the following method to prepare the adsorbent for separating nitrogen methane:
[0065] 1) Configure a mixed solution of a certain concentration: under the condition of 90 ° C, mix a certain amount of PVA and PEG with deionized water, wherein the weight ratio of PVA and PEG is 1:1, and then stir it, It is completely dissolved in water to obtain a mixed solution, and the amount of deionized water added is controlled so that the total concentration of PVA and PEG in the mixed solution is 0.5wt%;
[0066] 2) Fully mix and stir the ground carbon molecular sieve (40-60 mesh) and the mixed solution, then carry out suction filtration and separation, and dry the filtered solid overnight at 150° C. to obtain the final product for nitrogen separation. Sorbent samples for methane.
[0067] The adsorption capacity of the modified sample to nitrogen and methane was measured by the static adsorption method in Example 1, and the results are shown in Table 2.
[0068] Table 2 ...
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