Method for preparing ethylbenzene by liquid phase alkylation of ethylene
A technology of ethylene liquid-phase alkyl and ethylbenzene, which is applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problems of poor catalyst stability and regeneration performance, and achieve improved hydrothermal stability and water resistance Performance and regeneration performance improvement, the effect of focusing ability improvement
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Embodiment 1
[0009] Get 50 grams of sodium type beta zeolite molecular sieve former powder, its silicon aluminum molar ratio SiO 2 / Al 2 o 3 is 25, the sodium-type zeolite beta molecular sieve powder is exchanged with ammonium nitrate solution, and after drying, the ammonium-type beta zeolite molecular sieve is obtained. Strip, drying and calcining to obtain a strip-shaped hydrogen-type catalyst with a diameter of 1.6 mm.
[0010] The above catalyst was treated with water steam for 6 hours under the condition of 520°C. Then treat it with 0.5 mol / L citric acid solution at 50°C for 7 hours, the weight ratio of the citric acid solution to the catalyst is 5, dry and roast at 480°C for 3 hours to obtain the finished catalyst.
[0011] Take 2 grams of the catalyst prepared above and place it in a fixed-bed reactor. At a temperature of 220°C, a pressure of 3.5 MPa, a benzene / ethylene molar ratio of 6 / 1, and an ethylene weight space velocity of 1.5 hours -1 Under the conditions, the ethylene ...
Embodiment 2
[0022] The strip-shaped hydrogen-type catalyst with a diameter of 1.6 mm prepared according to Example 1 was treated with water vapor at 470° C. for 8 hours. Then treat it with 0.5 mol / L citric acid solution at 50°C for 7 hours, the weight ratio of the citric acid solution to the catalyst is 5, dry and roast at 480°C for 3 hours to obtain the finished catalyst.
[0023] Take 2 grams of the catalyst prepared above and place it in a fixed-bed reactor. At a temperature of 220°C, a pressure of 3.5 MPa, a benzene / ethylene molar ratio of 6 / 1, and an ethylene weight space velocity of 1.5 hours -1 Under the conditions, the ethylene conversion rate is 100%, and the ethylbenzene selectivity is 93.6%. After 500 hours of reaction, the ethylene conversion rate is 99%, and the ethylbenzene selectivity is 92.7%. The reaction was carried out for 485 hours before ethylene was detected in the reaction product, indicating that the activity and stability of the catalyst was good. In order to ev...
Embodiment 3
[0025] The strip-shaped hydrogen-type catalyst with a diameter of 1.6 mm prepared according to Example 1 was treated with water vapor at 470° C. for 8 hours. Then treat it with 1.0 mol / L citric acid solution at 50°C for 4 hours, the weight ratio of the citric acid solution to the catalyst is 5, dry and roast at 480°C for 3 hours to obtain the finished catalyst.
[0026] Take 2 grams of the catalyst prepared above and place it in a fixed-bed reactor. At a temperature of 220°C, a pressure of 3.5 MPa, a benzene / ethylene molar ratio of 6 / 1, and an ethylene weight space velocity of 1.5 hours -1 Under the conditions, the ethylene conversion rate is 100%, and the ethylbenzene selectivity is 93.8%. After 500 hours of reaction, the ethylene conversion rate is 99%, and the ethylbenzene selectivity is 92.6%. The reaction was carried out for 480 hours before ethylene was detected in the reaction product, indicating that the activity and stability of the catalyst was good. In order to ev...
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