Open AccessTHE IMPREGNATED FIBROUS CHEMISORBENTS FOR COLORIMETRIC DETECTION OF THE SULFUR DIOXIDE
Author(s) -
Р. Е. Хома,
А. А. Еннан,
T. S. Bіenkovska,
Р. М. Длубовский,
С. В. Водзинский,
Tetiana Mykhailova
Publication year - 2022
Publication title -
ukraïnsʹkij hìmìčnij žurnal
Language(s) - English
Resource type - Journals
eISSN - 2708-129X
pISSN - 2708-1281
DOI - 10.33609/2708-129x.88.01.2022.35-48
Subject(s) - hexamethylenetetramine , chemistry , aqueous solution , ethylenediaminetetraacetic acid , sulfite , tannic acid , sulfur dioxide , amine gas treating , absorption (acoustics) , colorimetry , inorganic chemistry , chromatography , organic chemistry , chelation , materials science , composite material
The paper presents the research results on the colorimetric behavior of impregnated fibrous chemisorbents (IFCS-I) of acid gases with visual identification of the dynamic absorption capacity “response” moment during the absorption of sulfur dioxide. Chemisorbents were obtained by impregnation of fibrous carriers by N-containing organic bases aqueous solutions with adding acid-base indicators (Ind). IFCS-I based on hexamethylenetetramine (IFCS-HMTA-I) and polyethylenepolyamine (IFCS-PEPA-I), as well as IFCS-MEA-EDTA-I based on monoethanolamine (MEA) and the disodium salt of ethylenediaminetetraacetic acid (EDTA) were used. The change specificity of colorimetric functions of indicator impregnated fibrous chemisorbents during their absorption of SO2 is revealed. IFCS-I original samples color significantly depends not only on the structure of Ind, but also the nature of amines (MEA, HMTA and PEPA), which are part of them. The color of the “response” samples of IFCS-MEA-EDTA-I, IFCS-PEPA-I and IFCS-HMTA-I, differ from the same properties of Bronsted acids aqueous solutions. The color change of azo-indicators occurs due to redox reactions with sulfite compounds. PEPA molecules and their ammonium cations in the composition of IFCS-I stabilize azo-indicators to these redox transformations.