A kind of molecular sieve desulfurizer and preparation method thereof
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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
Active Publication Date: 2016-08-10
PETROCHINA CO LTD
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It can effectively solve the technical problems of existing adsorption desulfurization agents, and provide a reliable guarantee for the research and implementation of adsorption desulfurization technology
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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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Abstract
The invention relates to a molecular sieve desulfurizer and a preparation method thereof. The method comprises heating a NaY molecular sieve and an ammonium salt solution in a water bath of 80-100 DEG C for ammonium exchanging, treating the ammonium-exchanged molecular sieve with inorganic acid or / and organic acid aqueous solutions, preparing an aqueous solution containing lanthanum and cerium with a concentration of 0.05-0.08 mol / L to exchange and modify the obtained molecular sieve ions until an exchange degree of the exchanged and modified lanthanum or cerium is 71-73 %, molding, drying and roasting the modified molecular sieve, and using an isopyknic immersion method to load transition metal elements so that a mass percent of loaded metals (on basis of oxide) is 10.0-20.0 %. Therefore, adsorptivity, selectivity and stability of the desulfurizer is well distributed, the experiment is simple to operate, raw materials are cheap and easy to purchase, a preparation process is simple, and no poisonous and harmful substances are generated.
Description
Technical field: [0001] The invention relates to a modified molecular sieve type desulfurizer for removing organic sulfide in light oil products and a preparation method thereof. Background technique: [0002] In recent years, the demand for clean fuels and high-quality chemical raw materials is increasing worldwide, and the production of clean fuels has become the focus of attention of countries all over the world. Since the sulfur components in gasoline and diesel are the main source of SOx in vehicle exhaust, with the increasingly stringent environmental regulations, the quality requirements for vehicle transportation fuels worldwide are becoming more and more stringent, low sulfur, low aromatics and The production of "clean fuel" with low olefin content has become a general trend, so the control method of sulfur content has also become a research hotspot. Sulfur in petrochemical products can be divided into organic sulfur and inorganic sulfur. Inorganic sulfur is mainl...
Claims
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