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Do you know the preparation method of hexapentapiperazine triethylene diamine? Introduce the application of triethylene diamine

1,2-Dichloroethane and ammonia water are fed into the tubular reactor, and the reaction is reacted by hot-pressure ammoniation at 150-250°C and 392kPa pressure. The reaction solution is neutralized with alkali to obtain a mixed free amine, which is concentrated to remove the sodium chloride, and then the crude Lu is distilled under reduced pressure to collect different fractions for separation. When the product is obtained, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine and polyethylene polyamine are co-produced. From the mother liquor of producing piperazine hexahydrate, ethylene can be obtained by fractional distillation. Do you know the preparation method of triethylenediamine? The production of 100t piperazine hexahydrate can obtain about 3-4t of triethylenediamine hexahydrate.

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Triethylenediamine is a tertiary amine compound with a double heterocyclic structure. It is mainly used as a gel catalyst for polyurethane foam. It is widely used in soft, semi-rigid and rigid polyurethane foam and elastomers. In addition, it can also Used as epoxy resin curing catalyst, ethylene polymerization catalyst, acrylonitrile polymerization catalyst-based ethylene oxide hydrocarbon polymerization catalyst, hexahydropyridine and other pesticide production initiators, and non-hydrogen electroplating additives. The chemical structure of triethylenediamine is very similar, it is a kind of cage-like preparation and application of triethylenediamine, two nitrogen atoms are connected with three ethylene groups. The structure of this bicyclic molecule is very full and symmetrical. It can be seen from the structure that there is no substitution group with great steric hindrance on the N atom, and its pair of empty electrons are easy to approach. In the foaming system, the isocyanate first reacts with it to form an active complex. The nature of the complex is very unstable. Once the urethane bond is formed, it will be freed, which is conducive to further catalysis. Although triethylenediamine is not a strong base, it exhibits extremely high catalytic activity for the reaction of isocyanate groups and active hydrogen compounds. Among the tertiary amine catalysts, triethylenediamine is the most important species, which can be widely used in various polyurethane foams (including soft, semi-rigid, rigid polyurethane foams, microcellular elastomers), coatings , Elastomers, etc. In the one-step foaming technique, triethylenediamine is notable for its main character. On the one hand, due to its high activity, the dosage is small; the second is other

has a strong catalytic effect on the gel reaction and foaming reaction, and the catalysis on polyurethane and hydroxyl (urethane formation reaction, gel reaction) is more selective.

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Keywords in this article: ethylene preparation catalysis ethyl catalyst reaction