Purifying agent for removing fluorine and chlorine in calcium carbide furnace tail gas and its preparation method and application
A technology of calcium carbide furnace tail gas and purification agent, which is applied in the direction of chemical instruments and methods, carbon monoxide, and other chemical processes. It can solve the problems of complex process, large environmental impact, and poor purification effect, and achieve a wide distribution of pore sizes and meet resource utilization. , good absorption effect
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Embodiment 1
[0026] Embodiment 1 prepares cleaning agent I
[0027] (1) Weigh 600 grams of sodium silicate (SiO 2 content 27.1wt%) was dissolved in 2400 ml of deionized water, and 570 g of sodium aluminate (Al 2 o 3 Content 19.3wt%), make SiO in this reaction raw material 2 / Al 2 o 3 The molar ratio is 2.5:1, the obtained gel is stirred for 1 hour, then moved to a 1 liter stainless steel crystallizer, left to age for 2 hours to 4 hours, the temperature of the water bath is raised to 58°C, and the temperature of the water bath is raised to 90°C after crystallization for 30 hours, crystallization 8 hours to complete the reaction. After filtering, the solids were washed three times with 600 ml of deionized water, and dried at 95° C. to obtain A-X intergrowth combined zeolite powder.
[0028] X-ray diffraction analysis (XRD analysis) showed that the combined zeolite contained 35% A-type zeolite and 64% X-type zeolite, and the Si / Al molar ratio was 1.05:1.
[0029] (2) Weigh 60 grams of ...
Embodiment 2
[0030] Embodiment 2 The effect comparative example of three kinds of purifiers
[0031] Utilizing the preparation method of Example 1, using commercially available A-type zeolite instead of the A-X combined zeolite powder obtained in step (1), to prepare Purifier II, using commercially available low-silicon X-type zeolite (Si / Al atomic ratio 1.03) Purifier III is prepared by replacing the A-X combined zeolite powder obtained in step (1).
[0032] The three kinds of purifiers were installed in the fixed adsorption bed respectively, and their removal effects on fluorine and chloride impurities were investigated.
[0033] Table 1 Feed gas composition
[0034]
[0035] Operating conditions: DN25 reaction tube, superficial linear velocity: 0.05m / s, residence time: 20s, operating temperature: 30°C, operating pressure: 0.5MPa. Purification results are shown in Table 2, Table 3, and Table 4 respectively.
[0036] Table 2 Purifying agent I is to the absorption result of fluorine, ...
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