Kinetic investigation on liquid–liquid–solid phase transfer catalyzed synthesis of dibenzyl disulfide with H2S-laden monoethanolamine

Multivariate Analysis in Selective Nitroacetophenone Conversion by Hydrogen Sulfide under Phase Transfer Catalysis

“…The effect of stirring speed and reaction time on p -NAP conversion is insignificant as shown in the figure. Based on the preliminary studies, it can be concluded that increasing stirring speed more than 1000 rev/min does not help to enhance total conversion of the substrate . In order to eliminate mass transfer effect entirely, the stirring speed was maintained at 1500 rev/min.…”

“…The sulfide concentration of the solution was measured by iodometric titration. 43 A 150 mL glass full baffled batch reactor of 6.5 cm internal diameter was used to carry out all of the experiments. The agitation effect for proper mixing was provided with a six-bladed glass turbine stirrer of 2 cm diameter, and the stirring speed was regulated with a digital speed regulation system.…”

“…Based on the preliminary studies, it can be concluded that increasing stirring speed more than 1000 rev/min does not help to enhance total conversion of the substrate. 43 In order to eliminate mass transfer effect entirely, the stirring speed was maintained at 1500 rev/min. The reaction rate became slower after high initial conversion, and to achieve maximum conversion all experiments were carried out for the duration of 8 h. So, the most influencing parameters are temperature, catalyst conc., p-NAP/sulfide concentration ration and MDEA concentration.…”

“…For the preparation H 2 S-laden MDEA, H 2 S gas was bubbled through aqueous MDEA solution kept in an ice bucket, and the process was continued until the required sulfide concentration was achieved (Figure ). The sulfide concentration of the solution was measured by iodometric titration . A 150 mL glass full baffled batch reactor of 6.5 cm internal diameter was used to carry out all of the experiments.…”

Multi‐objective optimization superimposed model‐based process design of an enzymatic hydrolysis process

“…While there are many examples of LLS systems with industrially relevant products, e.g., alcohols, fatty acids, and biodiesel, there are fewer examples for enzymatic LLS systems. Examples can be found at Yadav and Manjula Devi, Shimizu et al, Xu et al, or Bhattacharya et al However, rigorous physical‐chemical modeling of such processes is still a rarity that can only be found in a few published works, for example at Leveneur et al, Pfeuffer et al, Iliuta et al, and Singh et al While the combination of rigorous modeling and optimization of multiphasic processes can be found in literature, for example for a process with extractive‐reactive production of 5‐hydroxymethylfurfural at Torres et al, it is also still a rarity, especially regarding industrially relevant enzymatic LLS systems and multi‐objective considerations.…”