Shitanshu Pandey

Bio: Shitanshu Pandey is an academic researcher from Motilal Nehru National Institute of Technology Allahabad. The author has contributed to research in topics: Extraction (chemistry) & Aqueous solution. The author has an hindex of 4, co-authored 5 publications receiving 34 citations.

Reactive Extraction as an Intensifying Approach for the Recovery of Organic Acids from Aqueous Solution: A Comprehensive Review on Experimental and Theoretical Studies

Abstract: Organic acids are important targeted chemicals worldwide due to their variety of functionalities in various fields. Organic acids can be produced through chemical processes of fossil raw materials ...

Reactive Extraction of Gallic Acid Using Aminic and Phosphoric Extractants Dissolved in Different Diluents: Effect of Solvent’s Polarity and Column Design

Abstract: The current study is focused on the reactive extraction of gallic acid from aqueous solution using tri-n-octylamine (TOA) and tri-n-butyl phosphate (TBP) as extractants dissolved in four different diluents (4-methylpentan-2-one, kerosene, octane-1-ol, and decane) at 298 ± 1 K and 101.325 ± 1 kPa. A mathematical model for mass action law is used for estimation of equilibrium parameters and stoichiometric coefficients. The extraction results were interpreted as distribution coefficient (KD) and degree of extraction (E). The solvent’s ability to extract acid is observed as MIBK > octane-1-ol > n-decane > kerosene and MIBK > n-decane ≥ kerosene > octane-1-ol with TOA and TBP, respectively. On basis of extraction capabilities, TOA with active diluents and TBP with inactive diluents are found suitable for recovery of gallic acid from aqueous solution/fermentation broth. The feasibility of the extraction process for a counter current reactive liquid extraction column is assessed by calculating design parameters ...

Reactive extraction of gallic acid using trioctylamine and tributyl phosphate with natural oils

Abstract: Experimental and theoretical perspectives of reactive extraction of gallic acid (GA) from aqueous solutions using tri-n-butyl phosphate (TBP) and tri-n-octylamine (TOA) as extractant dissolved in three nontoxic natural oils, namely, rice bran oil, sunflower oil, and soybean oil, are investigated. The solvent's extractability is observed in an order of sunflower oil > rice bran oil > soybean oil and rice bran oil > sunflower oil > soybean oil with TOA and TBP, respectively. The theoretical insights of reaction mechanisms for the extraction of GA are estimated in the form of overall equilibrium constants (KE), stoichiometric coefficients (m), individual equilibrium constants (K11, K12, K21), and concentrations (C11, C12, and C21) of various complexes formed between extractant and acid.

Reactive Extraction as an Intensifying Approach for the Recovery of Organic Acids from Aqueous Solution: A Comprehensive Review on Experimental and Theoretical Studies

Abstract: Organic acids are important targeted chemicals worldwide due to their variety of functionalities in various fields. Organic acids can be produced through chemical processes of fossil raw materials ...

Kinetics of the extraction of succinic acid with Tri-n-octylamine in 1-Octanol solutions

Abstract: Kinetic studies for the extraction of succinic acid from aqueous solution with 1‐octanol solutions of tri‐n‐octylamine (TOA) were carried out using a stirred cell with a microporous hydrophobic membrane. The interfacial concentrations of species were correlated and thus the intrinsic kinetics was obtained. The overall extraction process was controlled by the chemical reaction at or near the interface between the aqueous and organic phases. The formation reaction of succinic acid‐TOA complex was found to be first order with respect to the concentration of succinic acid in the aqueous phase and the order of 0.5 with respect to that of TOA in the organic phase with a rate constant of (3.14 ± 0.6) × 10−8 m2.5·mol−0.5·s−1. The dissociation reaction of succinic acid‐TOA complex was found to be the second‐order with respect to that of succinic acid‐TOA complex in the organic phase and the order of –2 with respect to that of TOA in the organic phase with a rate constant of (1.44 ± 1.4) × 10−4 mol·m−2·s−1.

Solvent Polarity of Cyclic Ketone (Cyclopentanone, Cyclohexanone): Alcohol (Methanol, Ethanol) Renewable Mixed-Solvent Systems for Applications in Pharmaceutical and Chemical Processing

Abstract: Kamlet–Taft (KT) parameters were measured for four nonaqueous hydrogen bond donor (HBD)–hydrogen bond acceptor (HBA) solvent-pair mixtures: methanol–cyclopentanone, methanol–cyclohexanone, ethanol–cyclopentanone, and ethanol–cyclohexanone to define their solvent polarity as a function of composition. KT mixed-solvent polarities differed greatly from molar average property values. The preferential solvation (PS) model was used to correlate solvent polarity and showed that local compositions of 1:1 (HBD–HBA) complex molecules were highly asymmetric. Trends of KT parameters of both cyclohexanone and cyclopentanone mixtures were similar, although the specific hydrogen bonding interactions of HBD–HBA complex molecules in cyclohexanone mixtures were stronger than those of cyclopentanone mixtures according to density functional theory calculations, infrared spectroscopy, and solution macroscopic properties. Application of the PS model to pharmaceuticals showed that the solvent-pair mixtures have wide-working com...