A kind of method for preparing cumene by dimethylbenzyl alcohol reactive distillation coupled with hydrogenation reaction
A technology of dimethyl benzyl alcohol and reactive distillation, which is applied in the field of cumene prepared from dimethyl benzyl alcohol reactive distillation coupled with hydrogenation reaction, can solve the problems of poor catalyst stability and selectivity, achieve less side reactions, The effect of less impurity content and lower risk of polymerization
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Embodiment 1
[0063] The mesoporous molecular sieve SBA15, P123 and graphene were mixed according to the mass ratio of 1.2:0.1:0.3, stirred at 80°C for 6h, and calcined at 450°C in a nitrogen atmosphere for 8h to obtain a graphene-doped mesoporous molecular sieve active carrier, referred to as C-SBA-15. C-SBA-15 was washed with 0.25wt% dilute hydrochloric acid, the liquid-solid volume ratio was 1:1.2, washed three times, filtered and dried.
[0064] 60 mL of toluene, 3 g of activated C-SBA-15 and 15 mL of 3-mercaptopropyltrimethoxysilane were magnetically stirred at 100 °C for 24 h. After the reaction is completed, suction filtration and washing are performed to obtain a thiol-modified molecular sieve (C-SBA-15-SH for short). Its specific surface area is 1498m 2 / g.
[0065] 0.1 moL of 1,1,3,3-tetramethylguanidine, 0.1 moL of allyl bromide, and 0.1 moL of ethyl bromide were added to 50 mL of acetonitrile, and the mixture was reacted at 70° C. for 24 hours. After the reaction, 1,1,3,3-te...
Embodiment 2
[0070] The mesoporous molecular sieve, P123, and graphene were mixed in a mass ratio of 1.5:0.2:0.5, stirred at 80 °C for 6 h, and calcined at 450 °C in a nitrogen atmosphere for 8 h to obtain a graphene-doped mesoporous molecular sieve active carrier. Then follow the steps of Example 1 to prepare a thiol-modified molecular sieve C-SBA-15-SH with a specific surface area of 1627m 2 / g.
[0071] C-SBA-15-SH was mixed with ionic liquid AVTMG-HSO in a mass ratio of 1:1.2 4(Preparation of Example 1) was placed in a three-necked flask with acetonitrile solvent, added 5% azobisisobutyronitrile by total mass as an initiator, reacted at 80° C. for 16 hours, and fully cross-linked the two . After the reaction, the obtained product was filtered and separated, and dried in a vacuum drying oven for 12 h to obtain an acidic ionic liquid solid-supported catalyst C-SBA-15-AVTMG-HSO 4 Catalyst 2 was obtained.
Embodiment 3
[0072] Example 3: Preparation of Cumene
[0073] According to the attached figure 1 Process flow, dimethylbenzyl alcohol stream from POCHP process epoxidation separation, dimethylbenzyl alcohol 30wt%, cumene 67wt%, heavy component 3.0wt%, the heavy component includes methyl styrene polymer , phenol, etc. The feed flow was 3 ml / min.
[0074] The number of theoretical trays of the rectification tower is 70, and the feed position is at the 45 theoretical trays of rectification. The position of the reaction section of the rectification tower is 25 to 35 theoretical plates (the number of theoretical plates is calculated from top to bottom), and catalysts 1 and 2 are respectively loaded into the reaction section of the reaction rectification tower, and the amount of catalyst is 10g. The pressure at the top of the rectification tower is 10Kpa, the temperature of the tower still is 240°C, the temperature at the top of the tower is 93°C, the reflux ratio is 3, and the draw ratio D / F...
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