Binder-free high-silica MFI zeolite adsorbent and preparation method thereof
A binder-free and adsorbent-free technology, applied in chemical instruments and methods, and other chemical processes, can solve the problems of small adsorption capacity, poor separation effect, and low adsorption rate, achieve high para-selectivity, reduce bed The number of layers and the effect of simplifying the process flow
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Embodiment 1
[0032] Take by weighing silica sol (by weight percent, containing 40% SiO 2 ) 9.0 kilograms, in 30 liters of reactors, add 9.0 kilograms of tetrapropyl ammonium hydroxide (TPAOH) solution (by weight percent, containing tetrapropyl ammonium hydroxide 20%), stir 30 minutes, add MFI 360 grams of zeolite seed crystals (200 nanometers) were stirred for 8 hours, then the stirring was continued, the temperature of the crystallization kettle was raised to 160° C., and the crystallization was carried out for 28 hours. The product was taken out, filtered, washed with deionized water until neutral, and dried at 120°C for 6 hours to obtain high-silicon MFI zeolite powder 1. The properties of the powder are shown in Table 1.
[0033] Weigh 1.0 kg of powder 1, 0.030 kg of carboxymethyl cellulose, mix the above powder evenly, add 0.15 kg of water glass containing 10% sodium silicate in weight percentage, roll into a ball, and sieve the formed silicon ball , select 16-40 mesh silicon balls, ...
Embodiment 2
[0039] Take ethyl silicate (by weight percent, containing 28.8% SiO 2 ) 12.5 kilograms, in 30 liters of reactors, add 9.0 kilograms of tetrapropylammonium bromide (TPABr) solids, add 19.5 kilograms of water, add 4.8 kilograms of sodium hydroxide (solids), stir 30 minutes, add MFI zeolite crystal seed ( 200 nanometers) 360 grams, after continuing to stir for 8 hours, continue to stir, raise the temperature of the crystallization kettle to 140°C, and crystallize for 48 hours. The product was taken out, filtered, washed with deionized water until neutral, and dried at 120°C for 6 hours to obtain high-silicon MFI zeolite powder 2. The properties of the powder are shown in Table 1.
[0040] Weigh 1.0 kg of powder 2 and 0.02 kg of methyl cellulose, mix the above powder evenly, add 0.30 kg of water glass containing 10% sodium silicate in percentage by weight, roll into a ball, and sieve the formed silicon ball. Select 20-40 mesh silicon balls, that is, the adhesive-containing adsorb...
Embodiment 3
[0043] Weigh silica gel (SiO 2 ) 3.6 kg, in a 160-liter reactor, add 1.62 kg of ethylenediamine, add 108 kg of water, add 4.8 kg of sodium hydroxide (solid), stir for 30 minutes, then add 360 grams of MFI zeolite seed crystals (200 nanometers), continue After stirring for 8 hours, continue stirring, raise the temperature of the crystallization tank to 170° C., and crystallize for 28 hours. The product was taken out, filtered, washed with deionized water until neutral, and dried at 120°C for 6 hours to obtain high-silicon MFI zeolite powder 3. The properties of the powder are shown in Table 1.
[0044] Weigh 1.0 kg of powder 3, 0.10 kg of hydroxymethyl cellulose, mix the above powder evenly, add 0.03 kg of water glass containing 10% sodium silicate by weight percentage, roll into a ball, and sieve the formed silicon ball , select 16-30 mesh silicon balls, that is, the adhesive-containing adsorbent; the adhesive is transformed into a crystal, and the adhesive-containing adsorbe...
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