Preparation method of allyl amine mixture

Abstract

The invention discloses a preparation method of an allyl amine mixture. The preparation method includes following steps: S1, pouring a catalyst into a reation kettle, adding a certain amount of ammonium hydroxide, rising temperature, and adding chloropropene for ammonolysis reaction; S2, holding the temperature of the step 1, and adding liquid caustic soda; S3, rectifying a reaction product to evaporate water and excessive ammonia; S4, at corresponding temperature, collecting fraction-monoallyl amine; S, at corresponding temperature, collecting fraction-diallyl amine; S6, at corresponding temperature, collecting fraction-trially amine; S7, adding caustic soda flakes into a collected fraction mixture, and performing liquid separation to obtain. The preparation method is mild in reaction condition, ammonium hydroxide is used to replace ammonia in existing methods, and complex ventilation equipment is not needed, so that production cost is saved; by adding the caustic soda flakes, water absorbing effect can be realized, purity of the allyl amine mixture prepared by the method can be effectively improved, and the preparation method is simple to operate, high in yield and worthy of popularization.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a preparation method of an allylamine mixture. Background technique [0002] Allylamine is a colorless liquid with a strong ammonia and burning smell and is toxic. Used in the manufacture of pharmaceutical intermediates, as well as intermediates for agricultural chemicals, dyes and coatings, organic synthesis and resin modifiers. It can also be used to prepare amphoteric polymers, etc., and is a very important class of compounds. The preparation method of existing allylamine is mostly made in the device of reflux with allyl chloride and ammonia, needs to make thioisocyanate propylene and 20% hydrochloric acid react 15h in the reflux device, the reaction product After concentrating and crystallizing, add water to dilute, add dropwise liquid caustic soda to distill allylamine, collect the crude product and then fractionate it to obtain the refined product. The preparat...

AI Technical Summary

Problems solved by technology

The preparation method of existing allylamine is mostly made in the device of reflux with allyl chloride and ammonia, needs to make thioisocyanate propylene and 20% hydrochloric acid react 15h in the reflux device, the reaction product After concentrating and crystallizing, add water to dilute, then dropwise add liquid caustic soda to distill out allylamine, collect the crude product and then fractionate it to obtain the fine product, the preparation process is cumbersome, the equipment is complex and the reaction time is long, the cost is high and the purity is not high