Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Examınatıon Of The Lıquıd Phase Equılıbrıum Data Of Carboxylıc Acıd Extractıon From Aqueous Solutıons

Liquid-liquid extraction is a process used to separate carboxylic acids from their aqueous solutions. Equilibrium data relating to these systems are required to design an extraction process.

In this study, acetic acid, propionic acid, butyric acid and lactic acid were used as carboxylic acids; esters and alcohols in different chemical structures were used as solvents.

We investigated nineteen ternary systems under six different groups which were water - acetic acid – dibasic ester (diethyl succinate, diethyl glutarate, diethyl adipate), water - propionic acid – dibasic ester (diethyl succinate, diethyl glutarate, diethyl adipate), water - propionic acid - alcohol (octanol, nonanol, decanol, dodecanol), water - butyric acid - ester (ethyl propionate, dimethyl phthalate, dibutyl phthalate), water - butyric acid – dibasic ester (dimethyl succinate, dimethyl glutarate, dimethyl adipate), water - lactic acid - alcohol (octanol, nonanol, decanol). The solubility curves and the tie-lines of each ternary system were determined experimentally at 298.15 K. The distribution coefficients of acid and water were calculated. Separation factors and selectivity values were determined by means of these data. The reliability of the experimental data was tested by applying Othmer-Tobias correlation to the tie-lines. The results obtained from the experiments for the ternary systems are shown on tables and graphics.

When diethyl succinate, diethyl glutarate, diethyl adipate were used to extract acetic acid from aqueous solutions, the distribution coefficients were less than 1 and the performances of the solvents were similar to each other. These solvents can extract propionic acid easier than acetic acid from aqueous solutions. Dibasic esters (diethyl succinate, diethyl glutarate, diethyl adipate) and alcohols (octanol, nonanol, decanol, dodecanol) used to extract propionic acid from aqueous solutions indicated nearly the same extraction features. Ethyl propionate gave the highest distribution coefficient and the largest immiscibility region to extract butyric acid from aqueous solutions among the esters used in this study. Octanol used to extract lactic acid from aqueous solutions provided the highest distribution coefficient among the other alcohols.

BAHAR Hakan ,

Danışman : Doç. Dr. İsmail AYDIN

Anabilim Dalı : Kimya Mühendisliği

Programı (Varsa) : Proses ve Reaktör Tasarımı

Mezuniyet Yılı : Haziran 2006

Tez Savunma Jürisi : Doç. Dr. İsmail AYDIN (Danışman)

Prof. Dr. Mehmet Ali GÜRKAYNAK

Prof. Dr. Cemil İBİŞ

Prof. Dr. İsmail BOZ

Prof. Dr. Saadet PABUCCUOĞLU

Prof. Dr:İsmail BOZ