Preparation method for terpene maleimide

Abstract

The invention discloses a preparation method for terpene maleimide, comprising the following steps: taking terpene mainly containing alpha-pinene, alpha-terpinene and bipentene or taking turpentine mainly containing alpha-pinene as raw materials, using modified hydrogen macroporous strong acidic styrene cation exchange resin as a catalyst, and performing an addition reaction with maleic anhydride via a static bed system with a rectification device and a phase splitter, wherein the intermediate product TM of the addition reaction is not separated but directly reacts with ammonia water in a kettle under the function of a copper-tungsten catalyst to obtain the target product terpene maleimide; the yield of the terpene maleimide is greater than 80% and the purity is greater than 90%; compared with the existing synthesis technology, the preparation method has the advantages of few side reactions, short technique process, capacity of continuous production, simple post treatment, less waste water emission, and the like.

Description

technical field [0001] The present invention relates to a kind of preparation method of terpenimide, more specifically relate to a kind of method of synthesizing terpenimide. Background technique [0002] Terpenalimide is a common name for the imidization product of α-terpinene and maleic anhydride, and its chemical name is 1-isopropyl-4-methylbicyclo 2,2,2-5 -octene-2,3-dicarboximide. Because the imino group on the terpenimide is relatively active and can undergo substitution reactions with many organic substances, it is the best synthetic raw material for the renewable plant-sourced pesticide synergist N-alkylimide, and can also be used as a resin and A reactive monomer for plasticizers, etc., is a chemical intermediate with a wide range of uses. [0003] In the conventional terpinemide preparation method, the first step is mainly to use phosphoric acid as a catalyst to catalyze the isomerization of α-pinene and dipentene in turpentine or terpenes into α-terpinene and ad...

AI Technical Summary

Problems solved by technology

The disadvantage is that the reaction time is too long, which is more than 24 hours, and the regeneration and service life of the catalyst need to be solved

[0006] Luo Changquan, Duan Wengui et al [Biomass Chemistry and Engineering, 2006, 40(3): 25-28] catalyzed α-pinene and Maleic anhydride carries out isomerization addition reaction, DLB consumption is 3% of α-pinene weight, 145 ℃ of reaction temperature, 1 hour of reaction time, product TM yield 88%, purity 92.7%, have reaction time short, product yield The characteristics of high efficiency and high purity, and the post-reaction treatment only needs to be washed with 10% sodium chloride and distilled water, which eliminates the procedure of sedimentation and filtration, and greatly simplifies the post-treatment steps, but the life of the composite catalyst DLB also needs to be solved.

Images