- Method for preparing pentamethyldipropylene triamine
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The invention provides a method for preparing pentamethyldipropylene triamine. The method comprises the following steps: (1) performing a reaction on 3-dimethylaminopropylamine and acrylonitrile so asto form a 3-[[3-(dimethylamino)propyl]amino]propionitrile reaction solution, and performing separation so as to obtain a 3-[[3-((dimethylamino)propyl]amino]propionitrile pure product; (2) performinga hydrogenation reaction on 3-[[3-(dimethylamino)propyl]amino]propionitrile, hydrogen and a solvent under the action of a catalyst so as to obtain a N'-(3-aminopropyl)-N,N-dimethyl-1,3-propylene diamine reaction solution; and (3) performing a methylation reaction on the N'-(3-aminopropyl)-N,N-dimethyl-1,3-propylene diamine reaction solution obtained in the step (2), formaldehyde and hydrogen underthe action of a catalyst so as to obtain pentamethyldipropylene triamine. The method has the advantages of cheap and easily available starting materials, good selectivity to the product and high product yield, and the method is economical and effective, and has industrialization prospects.
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Paragraph 0065; 0068; 0070; 0072; 0075; 0077
(2019/11/20)
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