Oxidation Of Licorice Root Waste With Nitric Acid To Increase The Productivity Of Extractive Substances

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A. A. Orakbaev, R. K. Kurbaniyazov, Sh. S. Namazov, N. Kh. Usanbaev, A.M.Reymov

Abstract

The results of studying the processes of oxidation of licorice root waste with nitric acid depending on the acid concentration, temperature, duration and weight ratio of waste: acid are  presented in the article. It was shown that the amount of extracted substances in the waste in 1% sodium hydroxide solution can be increased from 5.87% to 49.68%, if the oxidation of 20% HNO3 is carried out at 40°C for one hour with the weight ratio of the organic part of the waste to nitric acid monohydrate equal to 1: 1.6. Losses of nitrogen oxides into the gas phase during the oxidation process have been determined. The elemental composition of the ash of the original waste, the chemical composition of the original and oxidized waste, extractive substances and insoluble organic matter of the waste, the content of functional groups in them were determined.


 

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