Preparation method of N,N-dimethyl-octan and decan or octan/decan amide, and special device therefore

Abstract

The invention discloses a preparation method of N,N-dimethyl-octan and decan or octan / decan amide. The method comprises the following steps: 1, adding a catalyst and an acid into a reactor, and carrying out nitrogen displacement; 2, controlling the temperature to keep the circulation ejection of the above obtained material in the reactor, and introducing dimethylamine; 3, separating out generatedwater; and 4, sampling and detecting, continuing a reaction until the acid value is less than 4%, performing filtration and discharging, and performing vacuum reduced-pressure distillation to obtain the finished product. A special device for the preparation device comprises the reactor, a dimethylamine inlet, an oil-water separator and a discharging opening are arranged at the upper part of the reactor, and an injector is arranged at the upper part of the reactor; a circulating pump and a heat exchanger are successively arranged in a closed loop between the reactor and the injector; and a filter is connected between the circulating pump and the heat exchanger. The injection reactor makes reactants fully mixed, so enhancement of mass transfer and heat transfer is facilitated, the reaction rate is accelerated, the concentration and temperature distribution is improved, side reactions are inhibited, and the selectivity of the reaction is improved.

Description

technical field [0001] The invention belongs to the field of organic synthesis, and in particular relates to a preparation method of N, N-dimethyl-octyl, decyl or octyl / decylamide and a special device thereof. Background technique [0002] N, N-dimethyl octanamide, English: N, N-diMethyloctanaMide, molecular formula: C 10 h 21 NO, CAS number: 1118-92-9. [0003] N, N-Dimethyldecanamide, English: N, N-Dimethyldecanamide (N, N-Dimethylcapramide), molecular formula: C 12 h 25 NO, CAS number: 14433-76-2. [0004] N,N-Dimethyl-octyl / decanamide, alias: dimethyloctyl / decanamide, FLAMD-810, English: N,N-Dimethyl(octan / decan)amides, molecular formula: C 10 h 21 NO; CAS No.: 308062-09-1. N,N-Dimethyl-octyl / decylamide is mainly used as a solvent and synergist for pesticide formulations. When the N,N-dimethyl-octyl / decylamide that dissolves the pesticide is diluted in water, it will exhibit the characteristics of a surfactant, and evenly disperse the original pesticide in the wa...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: in view of the low efficiency of gas-liquid-solid three-phase contact during amidation in the prior art, resulting in long reaction time, high energy consumption, and slow reaction, provide a method that is beneficial to gas, liquid, and solid phases. The preparation method of N,N-dimethyl-octyl, decyl or octyl / decylamide of three-phase amidation reaction

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