Method for production of N, N dimethyl cyclohexylamine

Abstract

The invention provides a novel method for preparing polyurethane catalyst N, N- dimethyl cyolohexlemine, taking as raw material, adding into high-pressure kettle, stirring evenly, heating to 140-160 Deg. C, feeding hydrogen, keeping reaction for 3-6 hours and getting mixture of N, N dimethyl cyolohexlemine and water; feeding said mixture into stillness kettle, adding into water-soluble salt compound to separate mixture, discharging most of water and getting coarse product; putting coarse product into distillation kettle, heating to 105- 110 Deg. C, distilling residual water in coarse product, vacuum-pumping and distilling in lower pressure and getting fine final product at 105-110 Deg. C. The invention takes salt compound as delamination dehydration agent and is characterized by simple process, low cost, high delamination and dehydration rate, little corrosion to device and almost no pollution.

Description

Technical field: [0001] The invention relates to a method for producing N,N-dimethylcyclohexylamine. Background technique: [0002] At present, in the process of producing polyurethane materials, the catalyst N, N-dimethylcyclohexylamine is required. This catalyst is mixed with cyclohexanone and dimethylamine, and added dropwise to the activated aluminum sheet, chlorine In the high mercury alcohol solution, and the reaction is heated and alkalized by sodium hydroxide, and then refined by distillation. But this production method steps are loaded down with trivial details, and process is complicated, and cost is high, and yield is low. In order to solve this problem, someone proposed a new method for producing N,N-dimethylcyclohexylamine catalyst, which still uses cyclohexanone and dimethylamine as raw materials, and the catalyst is prepared by one-step hydrogenation reaction through catalysis The crude product is then alkalized, dehydrated and distilled at atmospheric press...

AI Technical Summary

Problems solved by technology

[0003] (1) It still adopts alkalization treatment, so the production cost is still relatively high. Every ton of N,N-dimethylcyclohexylamine needs to consume 200 kilograms of solid alkali (NaOH). Not only the cost is high, but also in the production process NaOH solution is seriously corrosive to equipment, and it will cause serious environmental pollution after discharge

[0004] (2) Since the refining distillation is atmospheric distillation, the distillation temperature in the refining process is relatively high, at 140-160°C, so the production energy consumption is high, the distillation time is long, and the product color is not ideal

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