Organic modified molecular sieve and its preparation method and application
A molecular sieve and organic technology, applied in the field of organic modified molecular sieve and its preparation, 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., and achieves simple and controllable preparation method and separation. Larger, lower cost effect
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[0035] The method for preparing the organic modified molecular sieve of the present invention includes the following steps: After the molecular sieve is immersed, the solid-liquid separation, solid is dried to obtain an organic modified molecular sieve by an organic product solution, and the solid-liquid separation, solid is dried, and the structure of the organic matter is: M is an integer of 0 to 4, n is the degree of polymerization, R is -OH, -COOH, -CONH 2 , -Cooch 3 Or -cooch 2 CH 3 .
[0036] The study found that the R group in the above organic matter can produce a hydrogen bond with the hydroxyl group in the molecular sieve, thereby adjusting the aperture of the molecular sieve to adjust the action of the aperture, so that it produces an example, in particular Separation (N 2 + O 2 ) / Ch 4 When CH 4 Molecular dynamics diameter is 0.38 nm, n 2 The molecular dynamic diameter is 0.364 nm, and the dynamic diameter of oxygen is 0.346 nm, and the molecular sieve selective adso...
Embodiment 1
[0053] Preparation of PVA modified carbon molecular sieves using the following method:
[0054] 1) Configure a PVA aqueous solution: at a temperature of 90 ° C, mix the a quantity of PVA with deionized water, and then stirred for a certain period of time until the foam in the PVA solution gradually disappears, the solution is clear and transparent, and the concentration is 1 wt%. PVA solution;
[0055] 2) A sufficient mixing of the polished carbon molecules (40-60 mesh) with the PVA solution, after which the modified carbon molecular sieve solids impregnated with the organic polymer were filtered, and the filtered solid was carried out at 150 ° C. Drying overnight to get the final PVA modified carbon molecular sieve sample.
[0056] The specific surface area of the raw material carbon molecular sieve and the modified carbon molecular sieve sample is used in BET method. figure 1 .
[0057] From figure 1 It can be seen that after the modification of the present invention, the aper...
Embodiment 2～6
[0059] With the method of Example 1, only the concentration of the PVA solution was changed, and a series of different concentrations of PVA solution modified carbon molecular sieves were obtained, and the parameters of the specific change were shown in Table 1.
[0060] Table 1
[0061] EMBO PVA solution concentration (%) Example 1 1 Example 2 2 Example 3 3 Example 4 4 Example 5 5 Example 6 10
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