Synthesis of poly functional ion-exchangers loaded on glass fibers, bentonite, and as membranes.

number: 
607
إنجليزية
department: 
Degree: 
Imprint: 
Chemistry
Author: 
Hanan Abd El Latif Ebrahem
Supervisor: 
Dr. Ayad H. Jassim
Dr. Talal J. Mohammed
year: 
2001
Abstract:

The synthetic organic ion exchangers may be produced as powder, granular membranes or as ion exchange fibers or others. Synthetic organic ion exchanges which are synthetized as powder or granular are called "ion exchange resins". In this work , synthesis of ion exchange fibers by impregnation technique involved three steps:- Preparation of ion exchange polymer in a solution phase at certain viscosity, impregnation of glass fiber in the produced polymeric solution and then, drying of the impregnated fibers at 95-110 °C for different periodes of time depending on the type of the fiber and quantity of water. The polymers which were loaded on the above exchangers are of three types and were prepared in our laboratory as follow :- 1- Preparation of sulfonated phenol formaldehyde polymer which included sulfonation of phenol then polymerization with formaldehyde. 2- Preparation of sulfonation aniline formaldehyde which included aniline purification , sulfonation of aniline , purification of sulfonated aniline , polymerization of sulfonated aniline with formaldehyde in the presence of small amount of phenol. 3- -acetyl amino phenol formaldehyde were prepared by the reaction of para amino phenol with acetic anhydride to prepare para-acetyl amino phenol thus polymerized with formaldehyde in the presence of low concentration of phenol to produced P- acetyl amino phenol formaldehyde. All polymerization processes were carried by condensation polymerization at 100 °C , 95 °C, 90 °C respectively using reflux. Anovel exchanger was also prepared in this work, which was synthesized by first activation of bentonite using 2-6 M HCL , washing with distilled water, and drying at 110 °C , second impregnation of the activated bentonite with the solutions of the three polymers described above at certain viscosity separately followed by drying at 90- 110 °C until constant weight. Ion exchange resins were also synthesized in the form of membrane, in a process which involve dissolution of polyvinyl chloride powder in a mixture of 1:1 acetone and toluene, and heating the mixture to get a clear solution to which the fine powder of the polymeric or chelating exchangers were added with efficient stirring the resulting mixtures were spread on watch glasses, and the solvent was allowed to evaporate at room temperature. Inorganic exchanger loaded with poly-para amino phenol formaldehyde impeded with boron was prepared and characterized as heat resistance noval material.