Abstract: The technological process and characteristics of clay treatment to refine paraffin wax are introduced. The effects of different clays are compared. The optimal clay for the treatment of deoiled wax is selected, and its most suitable reaction conditions are studied. The experimental results show that: when the clay addition amount is 2.0%（w）, the contact temperature is 110 ℃, and the contact time is 50 min, the clay produced by Manufacturer A achieves the best effect. For the No.66 wax feedstock produced by a refinery, under the conditions of a clay addition of 4.0%,a contact temperature of 110 ℃ and a contact time of 50 min , the Saybolt color of product can reach ＋2, and clay treatment significantly improves the color of the wax feedstock.Using the clay-treated wax as the feedstock for hydrofining, under the process conditions of a reaction pressure of 8.0 MPa, a reaction temperature of 260 °C, a liquid hourly space velocity of 0.9 h^-1 and a hydrogen-to-wax volume ratio of 300, the Saybolt color of the hydrofined product can reach above +25, and the photo-stability (color number per SH/T 0403) can reach 7, meeting the specification requirements for semi-refined wax.

Key words: clay treating, paraffin wax, hydrofining