Effects of TiO2/Bentonite on the Pyrolysis Process of Oily Sludge

Abstract

Oil sludge is one of the major industrial solid wastes from petroleum production and refining. Implementing the harmless and resource treatment of oily sludge is an urgent problem to be solved. In this paper, TiO2/bentonite was prepared by sol-gel method, which was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy (FT-IR), and then used in the pyrolysis process of oily sludge. The addition of TiO2/bentonite give the best quality of pyrolysis oil; maximum oil recovery was achieved when setting the pyrolysis condition at 420°C for final pyrolysis temperature, 3 h for reaction time, 10°C/min for heating rate, 100 mL/min for nitrogen flow rate and 1% for catalyst dosage. Compared with the non-catalyst, oil recovery rate can be increased from 76.06% to 84.16%, the oil content of the residue decreased from 2.23% to 1.36%. The pyrolysis recovery oil was analysed by GC-MC, and the fractions of pyrolysis oil C6-C15 were increased by 27.84%. This shows that the addition of TiO2/bentonite decreased the carbon residue, increased oil recovery and improved product quality.

Keywords

• oily sludge, catalyst, tio2/bentonite, catalytic pyrolysis