Method for liquid-phase transalkylation of polyethylbenzene and benzene
A polyethylbenzene, transalkylation technology, applied in chemical instruments and methods, hydrocarbons, molecular sieve catalysts, etc., can solve the problems of poor catalyst stability, low ethylbenzene selectivity, and short regeneration cycle, and achieve stability. Good, high selectivity, and the effect of improving stability
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Embodiment 1
[0029] Weigh 50 grams of β-type molecular sieve powder (SiO 2 / Al 2 o 3 than 25, the grain size is between 0.01 and 0.05 microns). Molecular sieve / alumina (dry base ratio) is 80 / 20, extruded, dried at 110°C, and calcined at 550°C for 3 hours. Then it was added to the prepared ammonium nitrate aqueous solution with a weight concentration of 10%, stirred at a temperature of 90° C. for 1 hour, then centrifugally filtered, and washed twice with deionized water. Repeat the above ammonium ion exchange process 2 times. Dry at 110°C and bake at 550°C for 3 hours. Then at 550°C, under normal pressure, the weight ratio of ammonia to catalyst is 0.1h －1 treated under an ammonia atmosphere for 4 hours. Then stop feeding the ammonia gas, lower it to room temperature, then use a citric acid solution with a weight concentration of 5%, stir at 90°C for 2 hours, wash with deionized water twice, dry at 110°C, and roast at 550°C for 3 hours. That is, the finished catalyst is obtained.
Embodiment 2~9
[0031] With [embodiment 1], only the conditions of ammonia treatment are different. See Table 1 for details.
[0032] Table 1
[0033]
Embodiment 10
[0035] The initial activity of the catalyst was investigated in a fixed-bed reactor from bottom to top, and the reactor was a stainless steel tube with an inner diameter of 28 mm and a length of 800 mm. The catalyst load was 3 grams and diluted with glass beads. The catalyst was calcined at 550°C for 3 hours before use.
[0036]After loading the catalysts of [Example 1~9] into the reactor, test the leak of the system under the pressure greater than the reaction pressure, and then raise the temperature of the catalyst under the protection of nitrogen. After the temperature reaches the set temperature, the nitrogen pressure is increased to the set pressure, and the pre-mixed benzene and polyethylbenzene transalkylation materials are quickly pumped in. After some liquid materials come out of the sampling port, the feed is changed to the set flow rate.
[0037] The reaction conditions are: temperature 240°C, pressure 4.0MPa, liquid phase weight space velocity 2 hours -1 , The we...
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