Intensification of conversion of glucose to lactic acid: equilibria and kinetics for back extraction of lactic acid using trimethylamine

Abstract

Alamine 336 is an e ective extractant for the recovery of lactic acid from aqueous solutions. An approach for regeneration and product recovery from such extracts is to back extract lactic acid with a water soluble, volatile tertiary amine such as trimethyl amine. Equilibrium data are presented that show near stoichiometric recovery of lactic acid from amine extract. Kinetics of back extraction of lactic acid from Alamine 336 in octanol into aqueous trimethyl amine (TMA) has been presented. Back extraction reaction in a stirred cell falls in Regime 3, extraction accompanied by a fast chemical reaction. The reaction has been found to be zero order in TMA and ÿrst order in lactic acid with a rate constant equal to 16:67=s 1 . The data reported in this work will be useful in designing the lactic acid recovery system. In thermal regeneration of TMA, 99% of TMA was removed at 200 mmHg from trimethylammonium lactate aqueous solution. ?

Modeling of kinetics of a microfluidic reaction–extraction process for the preparation of KH 2 PO 4

“…Four regimes have been identified depending on the value of a dimensionless parameter, Hatta number [30,31], which is represented by for a reaction of mth-order in the solute A, and nth-order in the extractant B. There is no effect of mass transfer on the extraction rate when Ha number is less than 0.3 in Regime 1 (for a very slow reaction in the bulk phase) or larger than 3 in Regime 3 (for a fast reaction at the liquid-liquid interface).…”

Reactive Extraction of Caproic Acid using Tri-n- Butyl Phosphate (TBP) in Non Toxic Diluents

“…Lots of work on the reactive extraction of various carboxylic acids [11][12][13][14][15][16][17][18][19][20][21][22][23][24] using tertiaryamines(TOA) and quaternary amines(Aliquat) has been done but very little work using organophosphorus extractants for caproic acid extraction using natural diluents is hardly available in the literature. The distribution coefficient of caproic acid between water and TBP dissolved in diluents (vegetable oils) were studied at isothermal conditions, in the present work.…”

Enzymatic synthesis of hydrophobic compounds integrated with membrane separation

“…The delivery of the product to the organic phase is dependent on separating it from other reactants, including mixtures of enantiomers (Huang et al, 2004;Jin et al, 2003;Ma et al, 2006;Nomoto et al, 2003), shifting the reaction equilibrium to favour the products (Hossain et al, 2008, Vu et al, 2013Wasewar et al, 2004), and preventing the precipitation of a hydrophobic product in the reaction phase after the saturation concentration is exceeded (Jakubke et al, 1985). Extraction of the product to the organic phase was applied for both microbiological processes (Hossain et al, 2008;Huang et al, 2004, Ma et al, 2006 and enzymatic reactions (Penci et al, 2010;Villa et al, 2005;Vu et al 2013;Yankov et al, 2004).…”