Ether-containing polymer modified molecular sieve and its preparation method and application
A technology of molecular sieves and polymers, applied in separation methods, chemical instruments and methods, climate sustainability, etc., can solve the problems of high temperature energy consumption process of activation hole expansion, high separation energy consumption, low separation of nitrogen and methane, etc., to achieve The preparation method is simple and controllable, the separation ratio is large, and the cost is low
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[0040] The preparation method of the ether-containing polymer-modified molecular sieve of the present invention comprises the following steps: after impregnating the molecular sieve with an ether-containing polymer solution, separating the solid from the liquid, and drying the solid to obtain the ether-containing polymer-modified molecular sieve, wherein the ether-containing polymer The structural formula of ether polymer is n is the degree of polymerization, m is any integer from 1 to 5, and R is H, C1-C4 alkyl, halogen or aryl.
[0041] The study found that the oxygen in the molecular chain of the above-mentioned ether-containing polymer can generate hydrogen bonds with the hydroxyl groups in the molecular sieve, thereby adjusting the pore size of the molecular sieve to achieve the effect of partially adjusting the pores, so that it can generate shape selection when separating gases. role, especially in the separation of N 2 / CH 4 when CH 4 The molecular dynamics diamete...
Embodiment 1
[0058] Prepare PEG-modified carbon molecular sieves as follows:
[0059] 1) Configure a certain concentration of PEG400 aqueous solution: at room temperature, mix a certain amount of PEG400 with deionized water, and then stir it to dissolve the organic polymer (PEG400) completely. The solution is clear and transparent, and the concentration is 5wt% PEG400 aqueous solution;
[0060] 2) Fully mix and stir the ground carbon molecular sieve (40-60 mesh) and PEG400 aqueous solution, then filter and separate the modified carbon molecular sieve solid impregnated with organic polymer, and dry the filter residue overnight at 150°C , to obtain the final PEG400 modified carbon molecular sieve sample.
[0061] The specific surface area of the raw material carbon molecular sieve and the modified carbon molecular sieve sample is measured by BET method, and the spectra are shown in figure 1 .
Embodiment 2
[0063] The PTMG modified carbon molecular sieve was prepared by the following method:
[0064] 1) Prepare a certain concentration of PTMG acetone solution: at room temperature, mix a certain amount of PTMG with acetone, and then stir it to completely dissolve the organic polymer (PTMG). The solution is clear and transparent, and the concentration is 1wt % PTMG acetone solution;
[0065] 2) Fully mix and stir the ground carbon molecular sieve (40-60 mesh) and PTMG acetone solution, then filter and separate the modified carbon molecular sieve solid impregnated with organic polymer, and dry the filter residue overnight at 150°C Dry to obtain the final PTMG modified carbon molecular sieve sample
[0066] The specific surface area of the raw material carbon molecular sieve and the modified carbon molecular sieve sample is measured by BET method, and the spectra are shown in figure 1 .
[0067] From figure 1 It can be seen that the pore size distribution of the carbon molecula...
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