Abstract
In this paper, the study of synthesis and stability in aqueous solutions of new coordination compounds of Ti(IV) and Zr(IV) with ligand N-hydroxy-succinimide is presented. The salts: TiOSO₄¡2H₂O and ZrOCl₂¡8H₂O used for obtaining the studied coordination complexes, can derive from recycling metallic residues resulted in mechanical technologies applied for titanium and zirconium in S.C. ZIROM S.A. Giurgiu.
In strong acidic or alkaline media, the complex compounds are instable. The optimal stability of the studied compounds is between the values of pH: 1?ˇ5.5; these are identical with the acidity of the tanning bathes for natural leathers. This fact is favorable for the use of these compounds as a desirable alternative in ecological tanning processes. The importance of this paper consists in studying and obtaining of new soluble and stable in aqueous solution products that can be used in ecological tanning technologies for natural leather as a replacement for the toxic chrome compounds. In adding, a way of using the residues of titanium and zirconium derived from mechanical industrial processes of these metals is also of economical importance. From these residues, sulfates, chlorides or complex compounds can be obtained determining the necessary quantities of these metals for our country.