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1. DETA mainly used as solvent and organic synthesis intermediate, used in the preparation of gas purification agent (for CO2 removal), lubricating oil additives, emulsifiers, photographic chemicals, surfactants, fabric finishing agents, paper enhancers, ammonia carboxyl complexing agents, ashless additives, metal chelating agents, heavy metal hydrometallurgy and cyanide-free electroplating diffusion agents, brighteners, ion exchange resins and polyamide resins. It is used as a room temperature curing agent for epoxy resin, with a reference dosage of 8-11 mass parts, and the curing condition is room temperature/24h or 100°C/30min.
2. DETA is used as a room temperature curing agent for epoxy resin, with 11 parts of liquid epoxy resin, and the applicable period of 50g resin complex is 25min (23 °C). It is mainly used for laminating supplies, casting products, adhesives and coatings, etc., and the general dosage is 5~10 parts. This product is also used as a solvent for the preparation of gas purifiers, lubricating oil additives, emulsifiers, photographic chemicals, surfactants, fabric finishing agents, paper enhancers, ashless additives, metal chelating agents, heavy metal hydrometallurgy and cyanide-free electroplating diffusion agents, brighteners, ion exchange resins and polyamide resins.
3. DETA used as room temperature curing agent for epoxy resin, the reference dosage is 8~11 mass parts, and the curing condition is room temperature/24h or 100°C/30min. The heat deflection temperature of the cured product is 90~125°C. It is also used in the manufacture of polyamide resins, ion exchange resins, surfactants, lubricant additives, fabric finishes and photographic chemicals. It is also commonly used as an intermediate in organic synthesis, solvent, gas purification agent, paper enhancer, ammonia carboxyl complexing agent, metal chelating agent, brightener, etc.
1. It is prepared by dichloroethane ammoniation method：1,2-dichloroethane and ammonia were fed into a tubular reactor for hot pressing ammoniation at a temperature of 150-250 °C and a pressure of 392.3 kPa. The reaction solution is neutralized with alkali to obtain mixed free amine, and the sodium chloride is removed at the same time after concentration, and then the crude product is distilled under reduced pressure to intercept the fraction between 195-215 °C to obtain the finished product. This method simultaneously produces ethylenediamine, triethylenetetraamine, tetraethylenepentamine and polyethylene polyamine, which can be obtained by controlling the temperature of the distillation column to distill the amine mixture and intercepting different fractions for separation.
Refining method: dehydration with metal sodium or anhydrous calcium sulfate and distillation under reduced pressure. If piperazine is mixed, it can be azeotropically separated from tetrapropylene.
2. Ammonolysis：Dichloroethane and ammonia water are respectively fed by the metering pump at 1:(4~6)(mol), and the material flows through the emulsification mixer and enters the tubular reactor. It is heated to 130°C in the preheating section, the pressure is maintained at about 4MPa, and the total residence time of the material in the reactor is 2min, which is discharged by the needle valve and flows into the neutralization pot through the catheter.
3. Neutralization：Add 30% sodium hydroxide solution (10% excess according to the amount of dichloroethane feeding) to the neutralization pot, when the ammonia hydrolysis reaction liquid continuously flows into the neutralization pot, most of the released ammonia is discharged from the top of the pot and introduced into the ammonia absorption tank for recovery for ammonolysis reaction. After the neutralization reaction of each batch is completed, it is moved into the concentration tower kettle and heated with a jacket to expel the ammonia and evaporate most of the water, and the temperature at the top of the tower is 96~100 °C; In the concentration process, sodium chloride is precipitated, which is separated and filtered by a desalination box; When the temperature at the top of the tower is between 100~110 °C, the distillate is collected, which contains a small amount of ethylenediamine, which can be concentrated and recovered; The distillate at the top temperature of 110~118 °C is 30%~70% crude ethylenediamine, and 70% ethylenediamine product after distillation and concentration. After the residue of the concentrator is discharged, the sodium chloride is filtered out, and the filtrate is divided into two layers. The upper layer of oil is a mixture of ethyleneamine products, and the lower layer is a concentrated lye, which can be recovered for neutralization reaction.
4. Fractionation：The ethyleneamine mixture that has been separated from the lye is moved into the rectification column kettle, fractionated at atmospheric pressure, and the obtained ethylenediamine is collected when the temperature at the top of the column is 115~118 °C. Then carry out vacuum fractionation, under the vacuum degree of 98.64KPa, respectively, collect 90~140 °C fraction into diethylenetriamine, 140~180 °C fraction into triethylenetetraamine, 180~200 °C fraction into tetraethylenepentamine, all the distillate above 200 °C is polyethylene polyamine; when the ratio of dichloroethane and ammonia is 1:6 (molar ratio), according to the above method, diethylenetriamine accounting for 26% of the yield can be obtained.
Avoid contact with oxides, acids, and moisture.
Yellow hygroscopic, transparent viscous liquid with a pungent ammonia odor. Soluble in water, acetone, benzene, ether, methanol, etc., insoluble in n-heptane. Insoluble in ether. The aqueous solution is strongly alkaline and reacts with inorganic or organic acids to form salts. It is easy to form binders with heavy metal salts. It is hygroscopic and forms white smoke in the air. Corrosive to copper and its alloys. Combustible. Poisonous. It is a strong alkaline corrosive liquid, and the maximum allowable concentration at the production site is 1mg/L. The production equipment should be sealed to prevent running, running, dripping and leaking. Operators should wear protective equipment and avoid direct contact with this product.
It is chemically strongly alkaline and reacts with inorganic or organic acids to form salts. It is easy to form complexes with heavy metal salts. Acylation reaction occurs with acid chloride. When reacting with fatty acids in xylene solution, the resulting water is removed by azeotropic distillation. At the same time, it is heated to generate 1-(2-aminoethyl)-2-alkyl Δ2-imidazoline.
Diethylenetriamine undergoes an addition reaction with isocyanate or thioisocyanate to form urea or thiourea derivatives. Piperazine is heated with matrix nickel or activated alumina.
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