Obtaining 2-alkylanthracene by anthracene alkylation and reacting to prepare 2-alkylanthraquinone
A technology of alkylation reaction and alkyl anthraquinone, which is applied in the field of preparation of organic matter, to achieve the effect of reducing operation difficulty, reasonable and feasible technical route, and low pollution
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[0060] According to a specific embodiment of the present invention, in step (2-3), the method for described multi-step distillation comprises:
[0061] Method 1: if figure 2 As shown, the feed liquid of a series of alkylanthracene products containing 2-alkylanthracene is subjected to the first distillation, and the distillate containing the light component Cj1-anthracene and the bottom product containing the heavy component Cj2-anthracene are separated; The distillate containing the light component C1j-anthracene is subjected to a second distillation to obtain a distillate containing the light component Cj3-anthracene, and a bottom product containing the target product Ci-anthracene;
[0062] Among them, the light component Cj1-anthracene is an alkyl anthracene product whose total carbon number j1 of the alkyl side chain is an integer of 1<j1<i+1, and the heavy component Cj2-anthracene is the total carbon number of the alkyl side chain j2 is i< The alkylanthracene product of t...
Embodiment 1
[0107] (1) Alkylation reaction.
[0108] Alkylation of anthracene and isopentene to prepare 2-pentylanthracene, mesitylene and N,N-dimethylformamide as a combined solvent, the catalyst is a spherical catalyst containing active Y-type molecular sieve, and alumina is used as a binder , based on the total weight of the catalyst, the content of the active Y molecular sieve is 82% by weight, the content of the binder is 18% by weight, and the average particle diameter of the catalyst particles is 100 μm. At room temperature, 460 g of anthracene, 640 ml of mesitylene, 160 ml of N,N-dimethylformamide, and 205 g of catalyst were added to a 2L stirred tank. After sealing, the temperature is raised to 165° C. at a rotational speed of 1000 rpm, and the pressure is 0.3 MPa. 151 g of isoamylene was added to the kettle through a plunger pump, and the feed rate was 6.6 g / min. After the feeding of isopentene was completed, the reaction was continued for 270 min while maintaining the reactio...
Embodiment 2
[0118] Prepare 2-alkylanthraquinones according to the method of Example 1, the difference is that in step (2), the cooling rate is 5.0°C / h, the crystallization temperature is 190°C, and the amount of seed crystal anthracene added accounts for 4% of the mass of the molten mixture. % by weight, the crystal growth time is controlled at 4h. After the crystallization process is over, the uncrystallized feed liquid is discharged and sent to the vacuum distillation system. Slowly heat up and sweat the crystal in the crystallizer, the heating rate is 4°C / h, the sweating end temperature is 195°C, the sweating amount is 10% by weight of the crystal mass, the sweating liquid circulates and contacts the material entering the melting crystallizer After that, the crystallization operation is carried out together. The uncrystallized alkylanthracene mixture is sent to the vacuum distillation system for the first vacuum distillation. The top pressure is 1KPa, the bottom temperature is 259°C, ...
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