Здійснено рН-, редокс та кондуктометричне дослідження хемосорбції оксиду сірки (IV) водними 0,1 моль/л розчинами таурату калію (TauK) і моноетаноламонію (TauMEA) в області температур 293 ÷ 313 К. Виявлено склад утворених при цьому сполук. Розраховано йон-молекулярний склад системи SO2 – TauK – H2O, концентраційні та термодинамічні константи утворення сульфітних та гідросульфітних асоціатів. Запропоновано склади просочуючих розчинів на основі MEA та TauK для отримання хемосорбентів пролонгованої дії респіраторного призначення.
Much research attention has been paid to amino acids as an alternative to amino alcohols for
capture of sulfur dioxide. Taurine (Tau) occupies a special place among amino acids. This
study was stimulated by the limited literature data on the nature of the interaction of SO2
with Tau salts aqueous solutions, the composition and relative stability of the corresponding
reaction products.
Chrono-pH-, chrono-redox- and chrono- conductometric studies of SO2 chemisorption with
potassium taurate (TauK) and monoethanolammonium (TauMEA) aqueous 0.1 M solutions
were carried out in the temperature range 293–313 K to study these processes.
The maxima on the differential pH-metric titration curves positions coincide with the positions
of the jumps on the integral and maxima on the redox-metric titration differential curves, as
well as with breaks on the conductometric curves position. Dk negative values indicate the
formation of weakly dissociated particles or less mobile ions in the solutions under study that
is confirmed by the data of mathematical calculations.
Using a mathematical model that takes into account the law of mass action, material balance
and electrical neutrality principle, SO2 – TauK – H2O solutions ion-molecular composition
and ionic strength were calculated. With an increase in the chemisotption SO2 amount, the
taurate anions concentration decreases due to the hydrolytic transformation into zwitter ions
+N
H
3CH2CH2SO2O- and the sequential transformation of hydrotaurate-sulfite (4:1 and 2:1;
I and II), taurate-sulfite (2:1; III), hydrotaurate- hydrosulfite
(1:1; V) associates. The concentration and thermodynamic constants for the formation ionic
associates I–V were calculated.
TauK input into impregnated fibrous chemisorbents (IFCS) composition obtained
by impregnating viscose fibers with monoethanolamine aqueous 0.25 M solutions
(IFCS-0.25MEA) leads to a synergistic increase in quantity of adsorbed SO2. IFCS-0.25MEATauK are long-acting sulfur dioxide chemisorbents, and TauK itself serves as a promotermodifier towards IFCS-0.25MEA preventing the MEA removal from IFCS surface by the GPS
flow due to the ionic associates formation and promoting deeper HOCH2CH2NH2 «response».
