A kind of binder-free spherical 5a molecular sieve adsorbent and preparation method thereof
A binder-free, molecular sieve technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of reducing adsorbent processing capacity, reducing the strength of molded bodies, and adverse effects, so as to increase adsorption capacity and mass transfer speed , Improve the effect of density and crushing strength
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[0015] The preparation method of adsorbent of the present invention comprises the steps of:
[0016] (1) Mix NaA molecular sieve and clay at a mass ratio of 93-97:3-7, add an auxiliary agent accounting for 1-5% of the mass of the mixed material and mix evenly to obtain a mixed powder, and the clay is kaolin and dickite , pearlite or halloysite,
[0017] (2) Put the mixed powder prepared in step (1) into the rolling ball equipment, add water while rolling to make the fine particles form small balls, collect the small balls with a diameter of 0.3-0.8mm and dry them,
[0018] (3) Soak the pellets after step (2) drying with silica sol, so that the silica sol fills the macropores in the pellets, filter, separate the pellets from the silica sol, and dry to make the SiO 2 The particles are deposited in the large pores inside the pellets, and then calcined at 530-700°C to convert the clay into a zeolite precursor.
[0019] (4) Put the ball after (3) step roasting into the aqueous so...
example 1
[0042] (1) Preparation of pellets
[0043] Mix 60kg of NaA molecular sieve raw powder, 3.8kg of kaolin, and 1.3kg of turnip powder evenly to make a mixed powder, put the mixed powder into a rolling ball in the rotary high-speed granulator, and spray it into the material during the rolling process Ionized water and the above-mentioned mixed powder are sprinkled, and the water used for spraying is 38% of the mixed powder quality. Small balls with a diameter of 0.3-0.8 mm were sieved and dried at 100°C for 8 hours.
[0044] (2) Deposit SiO in the channel 2 and crystallize
[0045] Get 50kg of the above pellets with SiO 2 Soak the silica sol with a content of 20% by mass for 10 minutes, filter and remove the silica sol, dry the soaked pellets at 100°C for 4 hours, and bake them at 540°C for 4 hours. The bulk density test shows that the pellets remain in the large pores of the pellets. SiO 2 The mass is 1.14kg.
[0046] Add the calcined pellets to sodium metaaluminate and sod...
example 2
[0050] (1) Preparation of pellets
[0051] Mix 60kg of NaA molecular sieve raw powder, 5.1kg of kaolin, and 2.0kg of turnip powder evenly to make a mixed powder, put the mixed powder into a rolling ball in a rotary high-speed granulator, and spray it into the material during the rolling process Ionized water and the above-mentioned mixed powder are sprinkled, and the water used for spraying is 38% of the mixed powder quality. Sieve pellets with a diameter of 0.3-0.8mm and dry at 100°C for 8 hours.
[0052] (2) Deposit SiO in the channel 2 and crystallize
[0053] Get 50kg of the above pellets with SiO 2 Soak the silica sol with a content of 30% by mass for 10 minutes, filter and remove the silica sol, dry the soaked pellets at 110°C for 4 hours, and bake them at 550°C for 4 hours. The bulk density test shows that the pellets remain in the large pores of the pellets. SiO 2 The mass is 1.93kg.
[0054] Add the calcined pellets to sodium metaaluminate and sodium hydroxide aqu...
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