A kind of molecular sieve desulfurizer and preparation method thereof
A molecular sieve and desulfurizer technology, applied in chemical instruments and methods, refined hydrocarbon oil, other chemical processes, etc., to achieve the effects of long regeneration cycle, increased adsorption capacity, and fewer acid centers
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Embodiment 1
[0029] The preparation process of a molecular sieve desulfurizer is:
[0030](1) Take 20 grams of NaY molecular sieves and place them in a 500 ml beaker, add 200 ml of ammonium nitrate solution with a mass fraction of 10%, heat up to 90°C under stirring, keep the temperature at a constant temperature for 2 hours, filter, wash, and dry at 110°C 2 hours, and then put it into a muffle furnace to program the temperature to 550° C., roast for 4 hours, repeat the above operation twice, and modify the molecular sieve product, coded as A.
[0031] (2) Take 20 grams of molecular sieve A and place it in a 500 ml beaker, add 200 ml of nitric acid, 0.6mol / L nitric acid and 0.2mol / L citric acid mixed solution containing 2w%, and heat up to 80°C under stirring. After 8 hours, the product is filtered, washed, and dried at 110°C for 4 hours, and the code is B.
[0032] (3) According to the weight ratio of molecular sieve: lanthanum nitrate exchange liquid = 1: 10, exchange B molecular sieve ...
Embodiment 2
[0036] The exchange solution in step (3) is 0.1 mol / L lanthanum nitrate solution, after exchange, drying and roasting, the rest of the preparation process is the same as in Example 1 to prepare molecular sieve desulfurizer 2.
Embodiment 3
[0038] In step (2), the molecular sieve was acid-washed and modified with 1 mol / L phosphoric acid solution, wherein the pH of the phosphoric acid solution was adjusted to 6-8, and the molecular sieve desulfurizer 3 was prepared, and the rest of the preparation process was the same as in Example 1.
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