Patent ID: 6974883
Filing Date: 2005-12-13
Classification: C07C

Abstract:
1. A triethanolamine-based mixture having high thermal stability over time for avoiding or reducing coloration thereof comprising from 99.2 to 99.9% by weight of triethanolamine, from 2000 to 50 ppm of a secondary dialkanolamine and optionally from 500 to 10 ppm of monoethanolamine, said triethanolamine-based mixture having: i) a sulphuric ash content of less than 300 ppm, measured according to the V.3.2.14 Standard of the European Pharmacopoeia (1994 Edition); and ii) a colour index of from 0 to 120 Hazens, measured according to the ASTM D 1209 Standard, after the said triethanolamine-based mixture has undergone a hot-ageing test at 140° C. in an inert atmosphere for a period of 4 hours.