Method for co-producing triacetonamine and isophorone

Abstract

The invention discloses a method for co-producing triacetonamine and isophorone, and relates to the technical field of compound synthesis. The synthesis method comprises the following steps: adding raw materials acetone, ammonia gas and a basic catalyst into a reaction kettle, stirring and reacting at the reaction temperature of 50-100 DEG C for 4-10 hours to obtain a reaction solution containingtriacetonamine and isophorone, carrying out vacuum rectification, continuously applying front fractions, and separating to obtain the triacetonamine and the isophorone. According to the method, the basic catalyst is adopted to catalyze dehydration condensation of acetone to generate mesityl oxide, and further catalyze themesityl oxide and acetone to generate phorone and isophorone, so that efficient co-production of the triacetonamine and the isophorone is realized; post-treatment is simple, the catalyst can be recycled, and no solid waste salt is generated; and the ratio of reaction raw materials is adjustable, and the selectivity of triacetonamine and isophorone is easy to control.

Description

Technical field [0001] The present invention relates to the field of compound synthesis, and more particularly to a method of co-generated tropropamine and isoophorone. Background technique [0002] Trimpopylamine, chemical name 2,2,6,6-tetramethylpiperidone, the only parent as a synthetic hindered amine light stabilizer (HALS), is the most important intermediate for producing HALS for derivatives 2, 2,6,6-tetramethylpiperidol, 2,2,6,6- tetramethylpiperidotine and the most commonly used HALS of the current market. With the growing demand in the photostacer market, trisprid ammine synthesis has been widely concerned about scientists, and related synthetic research reports have emerged. [0003] The current literature reported that the trifacenamine synthesis route is mainly divided into the following: [0004] 1) One-step: Acetone and ammonia are raw materials, using acidic catalyst catalytic synthesis, commonly used catalysts are mainly ammonium nitrate (US 427521), CAY molecular...

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Problems solved by technology

[0007] At present, there are few reports on the synthesis method for the co-production of triacetone amine and isophorone, and the catalyst used cannot be recycled, a large amount of solid waste salt is generated, and the selectivity of triacetone amine and isophorone is not easy to control