Ethylbenzene adsorbent and preparation method therefor
A technology of adsorbent and ethylbenzene, applied in the field of ethylbenzene adsorbent and preparation, can solve the problems of influence of purity, difficulty of high-purity ethylbenzene product, etc., and achieve the effect of good ethylbenzene selectivity
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[0017] The preparation method of the adsorbent provided by the present invention comprises the following steps:
[0018] (1) Mix the sodium-type X zeolite or Y zeolite raw powder and kaolin in a mass ratio of 88-96:4-12, roll into a ball, dry and calcine at 500-700 °C,
[0019] (2) carrying out alkali treatment at 90~100 ℃ with the mixed solution of sodium hydroxide solution or sodium hydroxide and sodium silicate after the roasting, so that the kaolin in the pellet is crystallized in situ into X zeolite or Y zeolite;
[0020] (3) carry out ion exchange with the aqueous solution of potassium salt for the pellet after (2) step alkali treatment, then carry out ion exchange with the aqueous solution of cesium salt; or carry out ion exchange with the mixed aqueous solution of cesium salt and potassium salt, the described The ion-exchange temperature is 90-150°C, and the pellets after ion-exchange are activated after washing and drying.
[0021] The step (1) of the method of the p...
example 1
[0044] The adsorbent of the present invention was prepared.
[0045] (1) Rolling ball molding: 94 kg (dry basis mass, the same below, produced by Sinopec Catalyst Changling Branch) with an average grain size of 0.3 microns and a silica / alumina molar ratio of 2.17 NaX zeolite raw powder Mix with 6 kg of kaolin (the content of crystallized material is 92% by mass, produced in Linfen, Shanxi) and 3.4 kg of succulent powder to form a mixed powder, put it in a turntable and spray an appropriate amount of water while rolling to make the solid mixed powder agglomerate Form into small balls, and the amount of water sprayed during rolling is 25% by mass of the mass of the solid mixed powder. The small balls with a diameter of 0.35-0.80 mm were sieved, dried at 80°C for 10 hours, and calcined at 540°C for 4 hours in an air flow.
[0046] (2) In-situ crystallization: the above-mentioned calcined matrix pellets were treated at 96°C for 4.0 hours with a sodium hydroxide solution with a co...
example 2
[0050] The adsorbent was prepared according to the method of Example 1, except that in step (1), the average grain size of the original NaX zeolite powder was 0.2 microns, and the molar ratio of silica / alumina was 2.05. The composition of the prepared adsorbent B and The physical data are shown in Table 1.
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