Patent ID: 7427358

Claim:
A process to treat the oil mill wastewaters (OMW) and especially for the preparation of Tyrosol and/or Hydroxytyrosol, which consists of: a) Rough Filtration (RF), Microfiltration (MF), Ultrafiltration (UF), Nanofiltration (NF) and Reverse Osmosis (RO) of the OMW; b) Chromatographic separation of Tyrosol, Hydroxytyrosol and other phenolic compounds from the concentrated RO; c) Oxidation of the so obtained Tyrosol to Hydroxytyrosol in the presence of methylrhenium trioxide and of hydrogen peroxide in a protic solvent; d) Concentration and pulverization of the high molecular weight portion with the recovery of water and compounds with a high added value.