Method for synthetizing N,N-diisopropylethylamine

Abstract

The invention relates to a method for synthetizing N,N-diisopropylethylamine; the method comprises the steps as follows: taking diisopropylamine, epoxy ethane as the raw material, taking zinc chloride, tetramethyl ammonium hydroxide as the catalyst, taking the water as the circulating medium, reacting and aging; the reaction is carried out under gas and liquid phases utilizing single kettle production; the specific operating conditions being normal pressure, the temperature being 50 to 180 degrees centigrade, the air speed of ethylene oxide gas being 50 to 100 kg / h, the mol ratio between diisopropylamine and epoxy ethane being 1-1.5, the dosage of the catalyst being 0.5-1 weight of diisopropylamine; thermal reacting for two hours, then discharging and filtering to remove the solid catalyst, evaporating diisopropylamine and moisture under normal pressure, adding with activated carbon dipping with Ru, Pt or Pd elements, decompressing, rectifying, collecting the products. The invention has the advantages of taking the water solution of the diisopropylamine as the main reaction line, adding with little catalyst into the water solution of the diisopropylamine, and reacting through the epoxy ethane under normal pressure, having excellent reaction effect.

Description

technical field [0001] The invention relates to a chemical synthesis method, mainly a synthesis method of N, N-diisopropyl ethyl (alcohol) amine using diisopropylamine as a raw material. Background technique [0002] N, N-diisopropyl ethyl (alcohol) amine is a widely used organic synthesis intermediate, and is the main raw material for synthesizing pesticide synergists (the synergist and pesticides are mixed, which can improve the insecticidal effect and reduce environmental pollution), and can also be used as an intermediate for the synthesis of dyes, pigments, surfactants, and pesticides, as well as raw materials for the production of stabilizers, preservatives, vulcanization accelerators, antioxidants, flotation agents, and emulsifiers. The current synthetic method has low equipment investment, low conversion rate, poor selectivity and high production cost. [0003] At present, the synthetic method of N, N-diisopropyl ethyl (alcohol) amine mainly contains following four ...

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Problems solved by technology

[0004] 1) Add ethylene oxide to the ethanol solution of diisopropylamine. After the absorption, the finished product is collected by fractional distillation. The reaction temperature of this route is high, and the material loss is large, it is difficult to control, and it is dangerous

[0005] 2) Add chloroethanol dropwise to the diisopropylamine solution, after the addition, react at 100°C for 8 hours, then neutralize, layer, extract, and fractionate to obtain the finished product. This route takes a long time to react and the process is complicated

[0006] 3), mixed reaction with diisopropylamine solution and ethylene glycol, add catalyst, as RuCl2(PPH3) 2, reaction temperature is high, and catalyst consumption is big, and reaction cost improves

[0007] 4), in a tubular reactor, such as diisopropylamine and ethylene oxide steam react under high temperature and high pressure, although the yield is high, the process operation is complicated, the technical requirements are strict, and it is difficult to control the progress of the reaction

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