Состав и относительная устойчивость продуктов взаимодействия оксида серы (IV) c водными растворами морфолина и N-алкилированных производных моноэтаноламина
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Дата
2015
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E-ISSN
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Анотація
Методами pH-, редокс- и кондуктометрического титрования изучено взаимодействие оксида серы (IV) с водными 0,1 M растворами N, N-диэтилмоноэтаноламина, N-(аминоэтил)моноэтаноламина и морфолина при 293 K. Установлен состав образующихся соединений. Показано, что образованию "ониевых"сульфитов отвечают положения первых максимумов на дифференциальных pH-метрических кривых титрования, а гидро- и пиросульфитов - вторых минимумов на дифференциальных редоксметрических кривых.
The results of pH, redox and conductivity studies of sulfur dioxide chemisorption by aqueous solutions containing some N-alkylated derivatives of monoethanolamine (MEA) (N,N-dimethyl- (DMMEA), N,N-diethyl- (DEMEA) and N-aminoethylmono- etanolamine (AEMEA)) and morpholine (MP) are described. The measurements are conducted at 293 К in order to determine the composition and relative stability of the interaction products. This reaction is accompanied by a formation of a sulfite, bisulfite and pyrosulfite of monoethanolammonium and morpholinium cations. The observed deviation of the position of the extreme in the differential pH-metric titration curves (as well as the mid jump in integral ones) from the expected strict stoichiometry is due to the simultaneous formation of a few products as a result of hydrolytic transformations and changes in an ionic strength caused by reaching an equilibrium «hydrosulfite—pyrosulphite». The N,N-dialkylation of MEA or its insertion into a cyclic compound (MP) are shown to reduce the absorbency of the prepared compounds in respect to SO2. «Опіит» sulfites stability correlates with the ligand (i.e. MEA derivatives) basicity. The relative stability of ethanolammonium sulphites in aqueous solutions may be ranged as follows: DEMEA>AEMEA> >DMMEA>MP. This range is transformed into MP>DMMEA> >DEMEA for hydrosulftes. The use of pH, redox and conductivity measurements data, which are mutually complementary, allows obtaining consistent and objective information on the «опіит» compounds formed in the systems «S02—Am—H20». The results obtained can be used in the development of methods for sanitary air cleaning from SO2.
The results of pH, redox and conductivity studies of sulfur dioxide chemisorption by aqueous solutions containing some N-alkylated derivatives of monoethanolamine (MEA) (N,N-dimethyl- (DMMEA), N,N-diethyl- (DEMEA) and N-aminoethylmono- etanolamine (AEMEA)) and morpholine (MP) are described. The measurements are conducted at 293 К in order to determine the composition and relative stability of the interaction products. This reaction is accompanied by a formation of a sulfite, bisulfite and pyrosulfite of monoethanolammonium and morpholinium cations. The observed deviation of the position of the extreme in the differential pH-metric titration curves (as well as the mid jump in integral ones) from the expected strict stoichiometry is due to the simultaneous formation of a few products as a result of hydrolytic transformations and changes in an ionic strength caused by reaching an equilibrium «hydrosulfite—pyrosulphite». The N,N-dialkylation of MEA or its insertion into a cyclic compound (MP) are shown to reduce the absorbency of the prepared compounds in respect to SO2. «Опіит» sulfites stability correlates with the ligand (i.e. MEA derivatives) basicity. The relative stability of ethanolammonium sulphites in aqueous solutions may be ranged as follows: DEMEA>AEMEA> >DMMEA>MP. This range is transformed into MP>DMMEA> >DEMEA for hydrosulftes. The use of pH, redox and conductivity measurements data, which are mutually complementary, allows obtaining consistent and objective information on the «опіит» compounds formed in the systems «S02—Am—H20». The results obtained can be used in the development of methods for sanitary air cleaning from SO2.
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Ключові слова
Оксид серы (IV), этаноламины, морфолин, водные растворы, взаимодействие, sulfur dioxide, etanolamines, morpholine, aqueous solutions, interaction, sulfur dioxide, ethanolamines, morpholine, aqueous solutions, interaction
Бібліографічний опис
Вопросы химии и химической технологии