Boric acid modified molecular sieve and its preparation method and application
A technology of molecular sieve and boric acid, which is applied in separation methods, chemical instruments and methods, climate sustainability, etc., can solve the problems of activated pore expansion high temperature energy consumption process, high separation energy consumption, low separation of nitrogen and methane, etc., and achieves the goal of preparing The method is simple and controllable, the separation ratio is large, and the cost is low
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[0031] The preparation method of the boric acid modified molecular sieve of the present invention comprises the following steps: after impregnating the molecular sieve with a boric acid solution, separating the solid from the liquid, drying the solid and then roasting to obtain the boric acid modified molecular sieve.
[0032] Studies have found that molecular sieves are roasted after being impregnated in boric acid solution, boric acid will react to obtain pyroboric acid, and the oxygen in it will form hydrogen bonds with hydroxyl groups in molecular sieves, thereby adjusting the pore size of molecular sieves to achieve partial pore adjustment. When the gas is used, it has the effect of shape selection, 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 molecular sieve is 0.364nm, and the molecular sieve can selectively adsorb N 2 , while for CH 4 low adsorption capacity. In addition, B ...
Embodiment 1
[0048] The boric acid modified carbon molecular sieve is prepared as follows:
[0049] 1) Prepare a certain concentration of boric acid aqueous solution: mix a certain amount of boric acid with deionized water at a temperature of 60°C, and then stir it to make the boric acid completely dissolve in the water. The solution is clear and transparent, and the concentration is 3wt% boric acid aqueous solution;
[0050] 2) Fully mix and stir the ground carbon molecular sieve (40-60 mesh) and boric acid aqueous solution, then filter and separate the modified carbon molecular sieve solid impregnated with boric acid, and dry the filter residue overnight at 150°C. The dried sample was placed in a tube furnace and calcined at 300° C. for 4 h in a nitrogen atmosphere to obtain the final boric acid-modified carbon molecular sieve sample.
Embodiment 2～3
[0052] By adopting the method of Example 1, only changing the concentration of the boric acid aqueous solution, a series of carbon molecular sieves modified with boric acid aqueous solutions of different concentrations were obtained, and the specific changed parameters are shown in Table 1.
[0053] Table 1
[0054] Example number Concentration of boric acid aqueous solution (%) Example 1 3 Example 2 5 Example 3 10
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