Preparation method of diethyltoluenediamine

Abstract

The invention provides a preparation method of diethyltoluenediamine. According to the method, 2,4 / 2,6-diaminotoluene and triethylaluminium take complex reaction; the reaction conditions are mild; thesafety is high; an obtained complex material containing an aluminum complex does not need aftertreatment and directly performs subsequent alkylation reaction, wherein the aluminum complex in the complex material is used as a catalyst; excessive 2,4 / 2,6-diaminotoluene in the complex material is catalyzed to take subsequent alkylation reaction with ethylene; after the alkylation reaction is finished, the aluminum complex can be recovered and reutilized; compared with a traditional process, the preparation method has the advantages that about 50 percent of solid waste can be reduced when each ton of target product of diethyltoluenediamine is produced; the production cost can be effectively reduced. The yield of the product obtained by the preparation method provided by the invention is highand can reach 90 percent; the purity is high and reaches 98.5 percent or higher.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a preparation method of diethyltoluenediamine. Background technique [0002] Diethyltoluenediamine (DETDA) is an important chemical raw material, widely used in curing agent, chain extender, polyurethane raw material, amine catalyst, lubricant, antioxidant of industrial oil, etc. [0003] The existing production process of DETDA is to use m-toluenediamine and aluminum powder as raw materials, react at about 285°C and 3-3.55MPa for about 5 hours to form a catalyst; then control the reaction temperature at 305°C and pressure at 4.5MPa , into ethylene, continue the reaction for about 8h, generate DETDA. However, the post-treatment in this process is complicated, mainly because the catalyst prepared with aluminum powder as raw material cannot be reused, and it is necessary to add water to the product system obtained after the reaction for hydrolysis reaction to obtain cr...

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Problems solved by technology

However, the post-treatment in this process is complicated, mainly because the catalyst prepared with aluminum powder as raw material cannot be reused, and it is necessary to add water to the product system obtained after the reaction for hydrolysis reaction to obtain crude DETDA and aluminum hydroxide precipitation, which will be refined in the next step. The reaction yield is about 80-85%; if the subsequent rectification operation is carried out directly without hydrolysis reaction, the catalyst will block the rectification equipment

It can be seen that the reaction yield of this process is low, and hydrolysis steps are required, which increases equipment investment. At the same time, each ton of crude product in the hydrolysis process will produce 2 tons of waste water, and waste water treatment will also increase production costs.

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