Interaction of Sulfur Dioxide with Aqueous Solutions of Amides

Abstract

The interactions in the systems H 2 O3Am3SO 2 (Am is formamide, dimethylformamide, acetamide, urea, tetramethylurea, tert-butylurea) at 278 and 293 K were studied pH-metrically. The results suggest formation of intermolecular and ion3molecule associates. The composition and stability of the compounds formed strongly depend on the structure and concentration of the solution components and on temperature.The possible reactions of SO 2 with compounds of various classes are very diverse, and studies of the behavior of SO 2 in aqueous solutions are of not only theoretical but also practical importance [1].

Removal of Nitrogen Dioxide and Sulfur Dioxide from Air Streams by Absorption in Urea Solution

“…When the urea concentration increased, the absorption rate increases, this agrees with the findings in the cases of using dimethylaniline as an absorbent as reported by Basu et al [27]. The activity of urea solution towards the removal of sulfur dioxide may be due to the possible bonding of two SO 2 molecules to each urea molecule [21]. The results of NO 2 absorption at various concentrations (100 -1000 ppm) and fixed absorbent temperature (25˚C) showed a clear increase in the absorption rate as the urea solution increases.…”

Solubility and thermodynamic properties of SO 2 in three low volatile urea derivatives

“…Moreover, they demonstrated strong dissolution ability for many substances. Although the SO 2 absorption kinetics with DMPU in a laminar falling film reactor [18] and its SO 2 solubility at 298 K [19], as well as the interaction in the system H 2 O-TMU-SO 2 at 278 K and 293 K [28] have been studied, a systematic work in SO 2 absorption with DMPU and TMU in a wide range of temperature and pressure can't be found in the open resources. Therefore, in this study the solubility of SO 2 in the selected organic solvents were determined at the temperature ranging from 293.15 K to 323.15 K with 10 K intervals under a pressure of 0 to 120 kPa.…”

Complex formation of sulfur(IV) oxide with ethylenediamine and its derivatives in water

“…Procedures of potentiometric and chronoconductometric titrations have been described elsewhere [6,21]. Potentiometric measurements were performed using a рН-121 pH-meter.…”