Patent ID: 7169191
Filing Date: 2007-01-30
Classification: C07F,C14C

Abstract:
1. A process for the preparation of a novel synthetic aluminium tanning agent, the process consisting of: i) sulfonating an aromatic compound having up to 14 carbon atoms followed by the addition of an aqueous mixture of organic ligands and polyfunctional polymer, ii) adding trivalent aluminium salt along with water to the reaction mixture formed in step (i) and mixing the reaction mass to form a complex, iii) adding sulfosalicylic acid to the reaction mixture formed in step (ii) to form a slurry, iv) adjusting pH of the slurry formed in step (iii), in the range of 2.5–3.0 by an alkalinizing agent, and optionally, subsequently aerating the slurry for a period of 30–60 minutes, v) drying the slurry to obtain the tanning agent in powder form and wherein the use of a polymeric matrix consisting of sulfonated aromatic hydrocarbon, organic ligands, polyfunctional polymer and sulfosalicylic acid anchors the aluminium by charge transfer of 3 s, 3 p and 3 d orbitals.