Obiettivo The possibility of using colloidal silicas of small size in the leathermaking process has been demonstrated. A new ecological white stabilized intermediate (WSI) for tanneries has been developed, obtained through new types of colloidal silicas with very small diameter (between 6 and 10 nm). Four molecules have given good results. The main achievement at the end of the project was production at the industrial level of 4 stable colloidal silicas adapted to the WSI specifications. The WSIs obtained with these molecules through the different processes developed in this research have allowed: the selection of the mechanical operations before tanning, allowing the choice in quality and thickness and the best adapted tanning process; one year preservation for the WSI; development of 3 new direct tanning processes: direct velvet, direct white and direct chromium, based on WSI; great quality improvements in the final leather produced; drastic reduction of the chrome pollution to comply with new European regulations; reduction of around 25% of the chemicals used; reduction of the labour cost of around 30%; the recycling of the wastes (nontoxic, since the colloidal silicas are food authorized) for the production of collagen hydrolysates for the food, pharmaceutical and cosmetics industries; a general saving for the tannery fixed at a conservative 30% compared with the classic wet blue process. Campo scientifico engineering and technologyenvironmental engineeringwaste managementwaste treatment processesrecyclingnatural scienceschemical sciencesinorganic chemistrytransition metalsnatural sciencesearth and related environmental sciencesenvironmental sciencespollution Programma(i) FP2-BRITE/EURAM 1 - Specific research and technological development programme (EEC) in the fields of industrial manufacturing technologies and advanced materials applications (BRITE/EURAM), 1989-1992 Argomento(i) Data not available Invito a presentare proposte Data not available Meccanismo di finanziamento Data not available Coordinatore Société Française Hoechst Contributo UE Nessun dato Indirizzo Tour Roussel Hoechst 92080 Paris la Défense Francia Mostra sulla mappa Costo totale Nessun dato Partecipanti (2) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Deutsche Gelatine-Fabriken Stoss AG Germania Contributo UE Nessun dato Indirizzo Gammelsbacher Straße 2 6930 EBERBACH Mostra sulla mappa Costo totale Nessun dato Società per Azioni Lavorazione Pelli Italia Contributo UE Nessun dato Indirizzo Corso Torino 155 10086 Rivarolo Canavese Torino Mostra sulla mappa Costo totale Nessun dato