Method for preparing isopropylbenzene by coupling dimethyl benzyl alcohol reaction rectification with hydrogenation reaction
A technology of dimethylbenzyl alcohol and reactive distillation is applied in the field of preparing cumene by reactive distillation of dimethylbenzyl alcohol coupled with hydrogenation, which can solve the problems of poor selectivity, poor catalyst stability, etc. The effect of less impurity content and less difficulty in separation
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Embodiment 1
[0063] Mesoporous molecular sieves SBA15, P123, and graphene were mixed according to the mass ratio of 1.2:0.1:0.3, stirred at 80°C for 6 hours, and fired at 450°C in a nitrogen atmosphere for 8 hours to obtain a graphene-doped mesoporous molecular sieve active carrier, referred to as C-SBA-15. Wash C-SBA-15 with 0.25wt% dilute hydrochloric acid, the volume ratio of liquid to solid is 1:1.2, wash 3 times, filter and dry.
[0064] 60mL of toluene, 3g of activated C-SBA-15 and 15mL of 3-mercaptopropyltrimethoxysilane were magnetically stirred at 100°C for 24h. After the reaction, filter with suction and wash to obtain a mercapto-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 reacted at 70° C. for 24 hours. After the reaction, 1,1,3,3-tetramethyl-2-ethyl-2-allylguanidine bromide (AVTMG-Br ...
Embodiment 2
[0070] Mesoporous molecular sieve, P123, and graphene were mixed according to the mass ratio of 1.5:0.2:0.5, stirred at 80°C for 6 hours, and fired at 450°C in nitrogen atmosphere for 8 hours to obtain a graphene-doped mesoporous molecular sieve active carrier. Then prepare the molecular sieve C-SBA-15-SH of mercapto modification according to the step of embodiment 1, its specific surface area is 1627m 2 / g.
[0071] According to the mass ratio of 1:1.2, C-SBA-15-SH and ionic liquid AVTMG-HSO 4(Preparation in Example 1) Place in a three-necked flask with acetonitrile solvent, add 5% azobisisobutyronitrile as an initiator based on the total mass, react at 80° C. for 16 hours, and fully crosslink the two . After the reaction, the resulting product was filtered and separated, and dried in a vacuum oven for 12 hours to obtain the acidic ionic liquid solid-supported catalyst C-SBA-15-AVTMG-HSO 4 Catalyst 2 is obtained.
Embodiment 3
[0072] Embodiment 3: preparation of cumene
[0073] According to attached figure 1 Process flow, dimethyl benzyl alcohol stream from POCHP process epoxidation separation, dimethyl benzyl alcohol 30wt%, cumene 67wt%, heavy component 3.0wt%, said heavy component includes methyl styrene polymer , phenol, etc. The feed flow rate was 3ml / min.
[0074] The number of theoretical trays of the rectification column 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 distillation tower, and the amount of catalyst is 10 g. The pressure at the top of the rectification tower is 10Kpa, the temperature at the bottom of the tower is 240°C, the temperature at the top of the tower is 93°C, the reflux ratio is 3, and the...
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