Preparation method of 2-alkyl anthraquinone
A technology of alkyl anthraquinone and alkyl anthracene is applied in the field of preparation of 2-alkyl anthraquinone, and achieves the effects of less pollution, reduced operation difficulty, and reasonable and feasible technical route
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[0021] According to the present invention, the preparation method of described 2-alkylanthraquinone comprises the following steps:
[0022] (1) preparing a reaction product containing an alkyl anthracene from anthracene;
[0023] (2) separating the reaction product containing alkylanthracene obtained in step (1), the separation method comprising: separating anthracene by melting crystallization and separating 2-alkylanthracene by distillation;
[0024] (3) Preparation of 2-alkylanthraquinones from 2-alkylanthracenes obtained in step (2).
[0025] According to the present invention, the raw material anthracene can be reacted to produce alkyl anthracene. The method for preparing the reaction product containing alkylanthracene from anthracene can be any single reaction or multi-step combined reaction to introduce an alkyl group into anthracycline to prepare alkylanthracene. The anthracycline structure-containing substances in the reaction product obtained through step (1) inclu...
specific Embodiment approach
[0053] According to a specific embodiment of the present invention, in step (2-3), the method for described multi-step distillation comprises:
[0054] 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;
[0055] 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...
Embodiment 1
[0100] (1) Alkylation reaction.
[0101] Alkylation of anthracene and isopentene to prepare 2-pentylanthracene, mesitylene as solvent and methanesulfonic acid as catalyst. At room temperature, 460 g of anthracene, 800 ml of mesitylene, and 42 g of methanesulfonic acid 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 reaction conditions, and then the reaction was terminated. 10 batches were reacted under the same conditions. After the catalyst was separated, the alkylation reaction product was collected uniformly as the raw material for the separation of alkylanthracene.
[0102] (2) Separation.
[0103] The alkylation reaction product is sent to the atmospheric distilla...
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