Abstract
The invention discloses an industrial preparation method of hexamethylenediamine, wherein the industrial preparation method comprises the following steps: 1) dissolving cyclohexene in a first organic solvent, carrying out electrocatalytic oxidation reaction in a reaction kettle, carrying out constant potential electrolysis to obtain a reaction solution, and carrying out reduced pressure distillation to obtain adipic dialdehyde; and 2) dissolving adipic dialdehyde in a second organic solvent, introducing ammonia gas and hydrogen, and carrying out reductive amination reaction under the action of a supported nickel catalyst to obtain the hexamethylenediamine. The reaction adopts an electrocatalytic oxidation mode, and the selectivity is controlled by utilizing electrode potential, so that the reaction is more accurate and sufficient, the product conversion rate is improved, and the product is easy to separate, clean and environment-friendly; according to the method, hexamethylenediamine can be prepared through rectification operation, the product conversion rate of the method reaches 98.70%, the total yield reaches 98.02%, the purity reaches 95.14%-98.13%, the requirements of industrial production are met, and the method has good application prospects in industry; in addition, raw materials and auxiliary materials are simple and easy to obtain, the price is low, the input cost is low, and the construction scale is not limited.
Description
technical field
[0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to an industrial preparation method of hexamethylenediamine. Background technique
[0002] Hexamethylenediamine, with a relative molecular mass of 116.20, a melting point of 42°C, and a boiling point of 204°C to 205°C, is a white flaky crystal with an ammonia odor at room temperature, and is a strongly basic organic compound. The main purpose of hexamethylenediamine is neutralization reaction with adipic acid, polycondensation can get nylon-66 product; neutralization reaction with sebacic acid, polycondensation can get nylon-610 product, it is a rare intermediate in synthetic materials. Nylon-66 and Nylon-610 products can be processed to produce engineering plastics, military-grade and civilian-grade fibers and other products. The materials with strong stretchability and weather resistance of these products can replace traditional metal materials, and are use...
