Informative Environment Qualifying Index

Utasi, Anett; Sebestyén, Viktor; Rédey, Ákos

doi:10.33927/hjic-2020-24

Cited by 1 publication

(1 citation statement)

References 28 publications

(29 reference statements)

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“…Since the chemical industry and the waste streams generated during chemical production have a harmful effect on the environment, it is necessary to minimize their harmful impact before releasing them into the environment and comply with legal regulations, both locally and globally. Moreover, it is important to conduct environmental impact assessments and environmental management with regard to the practical implementation of environmental regulations [1], e.g. determining the Informative Environment Qualifying Index.…”

Section: Introductionmentioning

confidence: 99%

Separation of Fumaric and Maleic Acid Crystals from the Industrial Wastewater of Maleic Anhydride Production

Papraćanin¹,

Đozić²,

Mujkić³

et al. 2022

Hung. J. Ind. Chem.

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In this research, a physicochemical analysis of the industrial wastewater from a factory that produces maleic anhydride was performed. Based on the conducted analysis (pH, electrical conductivity, density of the liquid phase, boiling point of the waste suspension, chemical as well as biological oxygen demand, and dry matter), it can be concluded that the waste stream obtained at the outlet pipe from the plant resulting from the production of maleic anhydride requires appropriate treatments. Some of the parameters measured, e.g. pH (0.97±0.06), boiling point (106.8±1.3°C) and acidity, indicate the presence of organic acids such as fumaric and maleic acids, which are formed during the production of maleic anhydride. The possibility of extracting crystals by adding urea and thiourea followed by forced cooling in a heat exchanger was investigated. The most effective method was the addition of thiourea when the most significant amount of crystals was obtained, namely 17.29 wt%. The addition of thiourea in combination with forced cooling greatly facilitates the process of separating the solid and liquid phases of the waste suspension, which could later be adequately treated by physical, chemical or biological methods.

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Section: Introductionmentioning

confidence: 99%