Akademik Veri Yönetim Sistemi
ICESME'19, Girne, Kıbrıs (Kktc), 8 - 10 Kasım 2019, sa.15, ss.26
Comparison of the results of the developed experiments with current publication on the separation of acids from aqueous solutions
Hilal Mete Günaydına , Yavuz Selim Aşçıb , Barış Kirişc ,
a Department of Chemical Engineering, Faculty of Chemical and Metallurgical Engineering, Yıldız Technical University, 34210 Istanbul, Turkey
bDepartment of Chemical Engineering, Faculty of Engineering, Istanbul University - Cerrahpasa, 34320 Istanbul, Turkey
cDepartment of Material and Material Processing Technologies, Vocational School of Technical Science, Istanbul University- Cerrahpasa, 34500 Istanbul, Turkey
hilalm@yildiz.edu.tr, sasci@istanbul.edu.tr, kiris@istanbul.edu.tr
Abstract
Carboxylic acids are the most common organic acid species. Carboxylic acids are widely used in a wide variety of sectors such as food, polymers, cosmetics, and pharmaceuticals. Mandelic acid, also called hydroxyl (phenyl) acetic acid from the aromatic alpha hydroxy acid group. In 1831, it was discovered by Ferdinand Ludwig Winckler in a study of bitter almond oil. It is a white crystalline solid which has the molecular formula C6H5CH (OH) CO2H but is soluble in water and polar organic solvents. It is a useful pioneer in the structure that can be used in various drugs and cosmetic products. Despite the many methods of obtaining phenyl acetic acid, because of hydrolysis, which is a commonly used method, production takes place in the form of aqueous solutions. Acetic acid; is an important chemical reagent used in the production of polyvinyl acetate, cellulose acetate, acetic anhydride, and esters. It plays an important role in leather and silk printing, artificial silk production and the production of polymers such as rubber-plastic. Since most of the vinegar production is carried out on acetic acid, its fermentation process is encouraged in the food market, resulting in the need to separate it from its aqueous medium, such as phenylacetic acid. Nowadays, acid separation from aqueous solutions is carried out efficiently by reactive extraction. The reactive extraction comprises, in addition to the liquid-liquid extraction, which occurs only in the presence of a solvent, a reagent capable of forming complexes with the desired acid. Phosphorous based and aliphatic amines frequently use as reagents. Kiris and Ascı (Kiriş & Aşçı, 2019) explained that the separation of hydroxy acetic acid (phenylacetic acid) from aqueous solutions by secondary amine structure reactive, Amberlite LA-2. In this study, the results of the experiments using TPA in the form of the tertiary amine as reagents for the separation of acetic acid were compared with the results of (Kiriş & Aşçı, 2019) studies. Reactive extraction was carried out in the presence of organic solvents (dimethyl phthalate-DMP, methyl isobutyl ketone-MIBK, toluene), which are common in traditional use. The comparison was limited to solvents used in both studies. Attempts were made to separate the phenylacetic acid and acetic acid from the aqueous solution by reactive extraction in the presence of seconder - tertiary amine-reactive and organic solvents prepared at different concentrations. Important factors for determining the efficiency of reactive extraction are loading factor (Z), distribution coefficient (D), and extraction efficiency (E) was obtained, and the results were analyzed.
Keywords: carboxylic acid, comparison of results, reactive extraction, tertiary amine-reactive, secondary amine
reactive