2017, Vol. 4, No. 2. - go to content...

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DOI: 10.15862/07RRO217 (https://doi.org/10.15862/07RRO217)

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Solonikova Y.S., Podolina E.A. Purification of benzoic acid in order to reduce the load on sewage of chemical laboratories. Russian journal of resources, conservation and recycling. 2017; 4(2). Available at: https://resources.today/PDF/07RRO217.pdf (in Russian). DOI: 10.15862/07RRO217

Purification of benzoic acid in order to reduce the load on sewage of chemical laboratories

Solonikova Yana Sergeevna
The national university of science and technology MISiS, Russia, Moscow
E-mail: Solonikova13@yandex.ru

Podolina Elena Alekseevna
The national university of science and technology MISiS, Russia, Moscow
E-mail: podolina70@mail.ru

Abstract. In this article the question of cleaning chemicals to minimize toxic waste into the waste water, chemical laboratories, and the possibility of using reagents with expired shelf life laboratory workshops in universities after their preliminary cleaning. The researches were carried out on the basis of purification of benzoic acid manufactured by the Rubezhansky Order of Lenin chemical plant in 1978 synthesized according to the state standard 10521-63. Purification of benzoic acid was carried out in two ways: by recrystallization and sublimation. Quality control of the initial and purified reagent was carried out based on the melting point and the quantitative content of the main substance in the reagent. Experimentally, it was found that benzoic acid after purification has the classification of a chemically pure reagent, which allows its further secondary use in laboratory practice and in calorimetry. The cleaning methods used in this study make it possible to clean chemical reagents with an expired shelf life of up to 99%, which subsequently significantly reduces the environmental burden on sewage. The proposed methods of cleaning can be carried out with the help of a laboratory assistant in the laboratory without the involvement of outside experts.

Keywords: wastes from chemical laboratories; benzoic acid; purification; sewage; recrystallization; sublimation; potentiometric titration method

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