Abstract
The process features of producing alkali metal ferrates (VI) in the presence of chromium and its compounds, which are contained in the feedstock were investigated. It was found that during the ferrate synthesis, chromium impurities move from iron components to the alkaline solution and crystalline ferrates as oxoanion CrO 4 2 . It is shown that at long-term storage of crystalline ferrates and their solutions in the presence of chromates, their decomposition degree increases. The influence of chromium impurities on the synthesis effectiveness of ferrate solutions by various methods was determined. It was revealed that during transpassive electrochemical dissolution with increasing chromium content in the anode material > 0.8%, a decrease in the target product yield is observed. Technological solutions to minimize the accumulation of Cr (VI) compounds in the target product, which lie in a rational feedstock selection, as well as the obligatory inclusion of several crystallization and extraction stages in inorganic (KOH solutions) and organic (methanol) solvents to the production cycle were proposed.
Highlights
Вивчені процеси одержання фератів(VI) лужних металів у присутності Хрому та його сполук, що містяться у вихідній сировині
Studies of cellular plastics used for the production of car seats [Text] / P
Что и в случае классических химических способов примеси соединений Cr, контактирующие в процессе синтеза с такими сильными окислителями, как O3, ClO, Na2O2, FeO42, Cl2 и т. п. также будут окисляться до CrO42− в щелочной среде, что может вызвать загрязнение целевого продукта соединениями Cr(VI)
Summary
W. Impact of feed opening width and position on PVC extrusion process effectiveness [Text] / J. Studies of cellular plastics used for the production of car seats [Text] / P. The impact of selected granulometric properties of poly(vinyl chloride) on the effectiveness of the extrusion process [Text] / B. Встановлено, що часто протягом синтезу домішки Хрому із залізовмісних компонентів переходять як у лужний розчин, так і у кристалічні ферати у вигляді оксоаніону CrO42−. Ключові слова: синтез фератів(VI), домішки Хрому, забруднення хроматами, визначення Cr(VI), ступінь перетворення. Ключевые слова: синтез ферратов(VI), примеси хрома, загрязнение хроматами, определение Cr(VI), степень превращения
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