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    Extraction of Propionic Acid from Aqueous Solutions Using Tri-n-octylphosphine Oxide and Dioctylamine in Different Solvents
    (Amer Chemical Soc, 2019) Uslu, Hasan; Hasret, Erdem; Kirbaslar, Sah Ismail
    This work examines the reactive extraction of propionic acid, a promising liquid-liquid extraction technique, using tri-n-octylphosphine oxide (TOPO) or dioctylamine (DOA) diluted with eight different solvents (n-octane, methyl isobutyl ketone (MIBK), 1-octanol, ethyl methyl ketone, diisobutyl ketone, n-decane, diethyl sabecate, 1-decanol) at 298.15 K to determine the most efficient mixture for the extraction processes. A phosphorous-based extractant, TOPO, has been chosen for the extraction tests since it has low water solvency and is more ecologically agreeable than the amine-type extractants. Among the other amine extractants reported in reactive extraction studies, there is no study on propionic acid extraction using DOA in the literature. Physical extraction experiments with pure solvents were also performed to analyze the effect of TOPO and DOA on the extraction process. Distribution coefficients, loading factors, and extraction yields of the processes were determined for the explanation of the results. It was concluded that the addition of TOPO or DOA to the organic phase significantly improves the extraction of propionic acid from its aqueous media. The extraction of propionic acid, using the binary solutions of TOPO/diluent or DOA/diluent, improves with an increase in the initial TOPO or DOA concentration. The highest extraction yield, E % = 98.01, was achieved with the DOA + methyl isobutyl ketone (MIBK) extractant system (1.652 mol kg(-1)), with a distribution coefficient of K-D = 49.352; thus, the use of the DOA/methyl isobutyl ketone system in the organic phase is suggested for the propionic acid extraction methods.
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    Reactive extraction of cis,cis-muconic acid from aqueous solution using phosphorus-bonded extractants, tri-n-octylphosphineoxide and tri-n-butyl phosphate: Equilibrium and thermodynamic study
    (Elsevier, 2021) Demir, Ozge; Gok, Asli; Uslu, Hasan; Kirbaslar, Sah Ismail
    cis,cis-Muconic acid falls under the category of carboxylic acids and finds application mostly in biodegradable polymers, agrochemicals, and the food industry. Owing to the high thermal reactivity based upon the twoterminal carboxylic groups present in their structure, the chemical industry has widely used carboxylic acids. The major obstacle encountered during the production of carboxylic acids is their recovery from aqueous solutions and fermentation media. Therefore, the recovery of HccMA by reactive extraction as a particular product capture method, using tri-n-octylphosphine oxide (TOPO) and tri-n-butyl phosphate (TBP) in organic diluents such as 1-butanol, isoamyl alcohol, methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), diisobutyl ketone, isobutanol, n-hexane, dimethyl glutarate, ethyl propionate, and diethyl carbonate (DEC) was executed in this study. This method was experimentally conducted to explore the most proper extractant and diluent combination. Extraction experiments were also conducted with pure diluents alone to examine the extractant effect on the extraction system. The important extraction parameters like distribution coefficient (KD), extraction efficiency (E %), loading ratio (Z), dimerization constant (D), partition coefficient (P), and complexation constant (KE11) were determined. Mass action law model interpreted the obtained results. For HccMA/TOPO extraction system, the maximum extraction efficiency was found 93.19% in the presence of n-hexane as a diluent. For HccMA/TBP extraction system, the maximum extraction efficiency was found 90.37% in the presence of ethyl propionate as a diluent. Thermodynamic studies at variable temperatures were also carried out to estimate Delta H, Delta S, and Delta G of the process. To investigate the feasibility of designing a counter-current liquid-liquid extraction column, the number of theoretical stages (NTS) were assessed by theodified Kremser equation and found between 3 and 5 to et the desired extraction efficiency.
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    Study on Oxalic Acid Extraction by Tripropylamine: Equilibrium and Computational COSMO-SAC Analysis
    (Amer Chemical Soc, 2020) Uslu, Hasan; Baykal, Esma; Gok, Asli; Kirbaslar, Sah Ismail; Santos, Dheiver
    Oxalic acid was extracted from aqueous solution using tripropylamine (TPA) in different organic solvents. Ten organic solvents such as 1-butanol, isoamyl alcohol, methyl ethyl ketone (MEK), methyl isobutyl ketone, diisobutyl ketone (DIBK), isobutanol, n-hexane, dimethyl glutarate, ethyl propionate, and diethyl carbonate (DEC) were used to prepare an organic phase with TPA. From the experimental data, some thermodynamic coefficients were calculated such as the distribution coefficient (K-D), loading factor (Z), and the extraction yield (E %). It is discovered upon examination that the physical extraction analyses performed with pure solvents for oxalic acid extraction from aqueous media can be improved essentially by adding TPA. As per the results obtained, the most effective oxalic acid extraction is achieved with an extraction productivity (efficiency) of 99.86% and a K-D of 716.948 if 2.608 mol kg(-1) of TPA diluted in MEK is utilized as the extractant mixture. The COSMO-SAC model has been used to analyze the experimental data for the first time. This model provides insight into the interactions between substances with good results.