Authors: M.M. Arinushkina, V.Y. Krylov, T.S. Kotelnikova, S.V. Gerasimov

Title of the article: Synthesis of 6-aminohexanoic acid by sulfuric acid hydrolysis of caprolactam

Year: 2020, Issue: 1, Pages: 61-67

Branch of knowledge: 05.17.04 Technology of organic substances

Index UDK: 54.057, 547.466.3

DOI: 10.26730/1999-4125-2020-1-61-67

Abstract: In this research work synthesis of 6-aminohexanoic acid was implemented with the method of acid hydrolysis of caprolactam – a trade product produced by JSC “AZOT”. The effect of hydrolysis conditions on the yield of the product was studied; the optimal parameters of the process for producing 6-aminohexanoic acid salt were selected. It was shown that hydrolysis is advisable to carry out in concentrations of sulfuric acid at a temperature of about 160ºC using 1.7 mol of water and 2.8 mol of sulfuric acid per 1 mol of caprolactam. Under these conditions, the hydrolysis time is 2.5 hours. The content of 6-aminohexanoic acid in the synthesized product was determined by the method of formol titration. After treatment with a suspension of calcium hydroxide, crystalline free form of aminoacid was isolated from crystalline sulfate of 6-aminohexanoic acid; in this case, 1.2 mol of hydroxide and 70 mol of water per 1 mol of salt are needed. The yield of technical 6-aminohexanoic acid was 98.1% of the theoretical one.

Key words: caprolactam hydrolysis 6-aminohexan acid synthesis analysis product yield filtration crystallizing calcium hydroxide heating sedimentation formol titration

Receiving date: 25.02.2020

Publication date: 11.06.2020

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