Binary substituted benzene modified molecular sieve and its preparation method and application
A molecular sieve and modification technology, which is applied in separation methods, chemical instruments and methods, and other chemical processes, etc., can solve the problems of high temperature energy consumption process of activation hole expansion, high separation energy consumption, low nitrogen and methane separation, etc. The method is simple and controllable, the separation ratio is large, and the cost is low.
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[0035] The preparation method of the binary substituted benzene modified molecular sieve of the present invention comprises the following steps: after impregnating the molecular sieve with a binary substituted benzene solution, separating the solid from the liquid, and drying the solid to obtain a binary substituted benzene modified molecular sieve, wherein the binary substituted benzene The structural formula of meta-substituted benzene is R 1 For C1-C4 alkyl, halogen or nitro, R 2 for-SO 3 H, -COOH, -OH, or -CH 2 Oh.
[0036] It was found that the R in the above binary substituted benzene 2 The group can interact with the hydroxyl group in the molecular sieve, thereby adjusting the pore size of the molecular sieve to achieve the effect of partial pore adjustment, so that it can have a shape selection effect when separating gases, especially in the separation of N 2 / CH 4 when CH 4 The molecular dynamics diameter is 0.38nm, N 2 The molecular dynamics diameter of the ...
Embodiment 1
[0054] TSA modified carbon molecular sieves were prepared as follows:
[0055] 1) Prepare a certain concentration of TSA aqueous solution: at room temperature, mix a certain amount of TSA with deionized water, and then stir it, so that TSA is completely dissolved in water, the solution is clear and transparent, and the concentration is 0.5wt%. TSA aqueous solution;
[0056] 2) Thoroughly mix and stir the ground carbon molecular sieve (40-60 mesh) and TSA aqueous solution, then filter and separate the modified carbon molecular sieve solid impregnated with TSA, and filter the filtered solid overnight at 150°C drying to obtain the final TSA modified carbon molecular sieve sample.
[0057] 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 .
[0058] from figure 1 It can be seen that the pore size distribution of the carbon molecular sieve has bee...
Embodiment 2～5
[0060] By using the method of Example 1, only changing the concentration of the TSA aqueous solution, a series of modified carbon molecular sieves with different loadings of the TSA aqueous solution were obtained, and the specific changed parameters are shown in Table 1.
[0061] Table 1
[0062] Example number Concentration of TSA aqueous solution (%) Example 1 0.5 Example 2 0.01 Example 3 0.05 Example 4 0.1 Example 5 1
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