Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Investigation of the Use of Various Synthetic Membrane for Separation

of Carboxylic Acids from Its Aqueous Solutions
Numerous biotechnological products are produced in chemical industry. In the production processes, it is very important removing these products from the fermentation broth and purification as well as obtaining. Carboxylic acids are one of the most common used biotechnological products in chemical industry which are used as raw material or additives in food, pharmaceutical, cosmetics, detergents, polymer, and metal industries and in agriculture.
The most common production method of the carboxylic acids is the fermentation method. Natural raw material used fermentation method has many advantages, however, products can be obtained only as diluted solutions. For this reason, removing products from aqueous solution is required after the production. There are many studies about removing carboxylic acids from aqueous solution using conventional separation processes such as distillation, crystallization and extraction.
Separation of carboxylic acids from aqueous solutions using synthetic membranes has been investigated within the context of this study. Aqueous formic, acetic, propionic, glycolic, malic, and sitric acid solutions were prepared in the experiments as mixtures to be separated. Nanofiltration (NF) and reverse osmosis (RO) membranes were used for the separation of acid solutions. Experiments were performed in high pressure membrane systems which allows to use synthetic membranes with an active surface area of 140 cm². Experiments were performed by using different initial acid concentrations (2.5-15 % w.) at 10, 20, 30 bar and 20 ⁰C. Thus, the effects of pressure, the type of membrane and the type of acids were analysed on the separation performance by using single acid solutions. Model equations were formed with the help of response surface methodolgy (RSM). Furthermore, in order to examine the separation perforance of membrane processes to separate the carboxylic acid mixtures, experiments were also performed with aqueous solutions of acetic and propionic acid mixtures in different proportion (2.5-7.5 %, 5-5 %, 7.5-2.5 %).
As a result of these studies, it has been understood that there is no way to recommend only one membrane type for the separation of various carboxylic acids from aqueous solutions. It has been also observed that synthetic membranes can be used successfully for the separation of large molecule carboxylic acids from water or mixtures of acids composed of very different molecule sizes.

  

ACAT Pınar

Tez Adı :İlaç Taşımaya Uygun Nanopartiküllerin Hazırlanması ve İncelenmesi

Danışman :Doç.Dr. Serkan Naci KOÇ

Anabilim Dalı :Kimya Mühendisliği

Programı :Proses Ve Reaktör Tasarımı

Mezuniyet Yılı :2013

Tez Savunma Jürisi :Doç.Dr. Serkan Naci KOÇ

Prof. Dr. İrfan KIZILCIKLI

Doç.Dr. M. Faruk ÖKSÜZÖMER

Yrd. Doç.Dr. Ali DURMUŞ

Yrd. Doç. Dr. Tuğba GÜRKAYNAK ALTINÇEKİÇ