Kinetics of phase transfer catalyzed reduction of nitrochlorobenzenes by aqueous ammonium sulfide: Utilization of hydrotreater off-gas for the production of value-added chemicals

Advances in hydrogen sulphide utilisation: phase transfer catalysed selective reduction of nitronaphthalene

“…Various MDEA concentrations (sulphide concentration kept constant) were prepared by taking 20 cm 3 of H 2 S-laden aqueous MDEA (with known sulphide and MDEA concentrations) solution and adding into it various proportions of pure MDEA and distilled water in such a way that the total volume was made up to 30 cm 3 . During the course of the reaction colour of the aqueous solution changes from greenish yellow to orange and then to reddish brown, that is useful in indicating the extent of reaction.…”

“…1,2 H 2 S is a poisonous gas for the environment and a corrosive gas for technological processes if it is present at more than 3 ppm. [3][4][5] H 2 S content of little more than 1 ppm is sufficient to poison catalyst used in fuel processing unit (FPUs) and electrolytes of fuel cells (FCs). 6,7 In recent years, petroleum reneries are compelled to process heavy crude oil that contains a higher amount of sulphur and nitrogen, due to the unavailability of light crude oil.…”

“…22 Several researchers have worked with tetra-n-butylammonium bromide (TBAB) as PTC for reducing CNBs and they got high conversions. 3,28 In our studies, reduction of 1-nitronaphthalene (1-NN) to 1-napthylamine (1-NA) was carried out using H 2 S-laden MDEA under L-L PTC.…”

Reduction of Chloronitrobenzenes by Aqueous Ammonium Sulphide: Triphase Catalysis by Anion Exchange Resin

“…The reduction of CNBs has been performed using ammonium sulphide as a reducing agent over liquid-liquid phase transfer catalysts (PTC) [4]. However, it is difficult to recover the catalyst and reuse it as it is soluble in the liquid phases.…”

Novelties of triphasic phase transfer catalysed Zinin reduction of nitrochlorobenzene by H2S-laden monoethanolamine

“…Petroleum reneries have always been the largest route to H 2 S. H 2 S gas in the environment, when exceeds more than 3 ppm, becomes poisonous for all living beings and corrosive for all technological processes. [1][2][3] A very low presence of H 2 S such as 1 ppm is enough to deactivate catalysts used in fuel processing units (FPUs) and is responsible for poisoning electrolytes of fuel cells (FCs). 4,5 In the present day, petroleum reneries around the world are forced to process sulphur-and nitrogen-containing heavy crude oil due to the unavailability of light crude oil.…”