Ethylenediamine (EDA for short), with chemical formula C2H8N2, is a typical aliphatic diamine, colorless or yellowish oily or watery transparent liquid, which produces smoke in the air. It smells like ammonia and is hygroscopic. The molecular weight is 60. 10, the melting point is 8.5℃, and the autoignition point is 385℃.
It is an alkaline substance, soluble in water and ethanol, slightly soluble in ether? Unless it is absolutely dry, it is insoluble in benzene and can form a boiling mixture with water, n-butanol and toluene? . When exposed to heat, open flame and oxidant, it is flammable and has moderate combustion risk. Can be sterilized by high pressure or filtration. ?
Ethylenediamine can be used to manufacture fuels, rubber vulcanization accelerators, drugs, solvents such as cellulose, emulsifiers, curing agents for epoxy resins and intermediates for manufacturing insulating paints and coatings. Ethylenediamine can be absorbed through digestive tract, respiratory tract and skin. Steam has a strong stimulating effect on skin mucosa and nasal mucosa, while liquid has a corrosive and sensitive effect.
187 1 year, A.W.Hofmann heated the solution of dichloroethane and ammonia alcohol in a heat pipe to prepare ethylenediamine for the first time. 1933, United Carbon Company and Dow Chemical Company successively built industrial production devices to industrialize this chemical reaction process? .
In the early 1960s, BASF Company of the Federal Republic of Germany developed and industrialized the hydroamination of ethanolamine to ethylenediamine (MEA method)? . MEA method is a process for synthesizing ethylenediamine from ethanolamine, ammonia, H2 and nickel-cobalt catalyst. Then, the technology of producing ethylenediamine by direct reaction of ethylene oxide and ammonia was developed.
In 1960s, China began to produce ethylenediamine. At that time, most of the products were ethylenediamine aqueous solution (about 70%). In the mid-1980s, China began to produce high-concentration ethylenediamine products after introducing technology? .
In 2008, Dalian Institute of Chemical Physics of Chinese Academy of Sciences began to develop MEA technology. In 2009, the catalyst screening was completed, and the scale-up model test and side line scale-up test of catalyst filling trickle plate tube were upgraded. 20 10 On March 24th, the proprietary technology of catalyst patent passed the technical appraisal organized by Liaoning Science and Technology Department and Shenyang Branch of Chinese Academy of Sciences.
20 10 may, the process software package for producing ethylenediamine by MEA was completed. August 20 10, the basic engineering design of the first industrial plant for producing ethylenediamine by MEA method in China was completed. On June 20 1 1 year, the basic construction of the plant was completed. 20111kloc-0/On October 20th, the first industrial plant for producing ethylenediamine by MEA in China was successfully started.