Provided is a method for preparing
fuel oil with high
alkane content by co-
cracking non-edible
grease and waste plastic. The method comprises the steps that 1, the waste plastic is
cut and broken into fragments of which the area is smaller than 100 cm<2>; 2, the waste plastic and the non-edible
grease are mixed according to the
mass ratio of 1:1-1:10; 3, the mixture is fed into a
cracking reactor, air in the reactor is replace by
nitrogen, heating is conducted, the heating rate is 5-300 DEG C / min, when the temperature of reactant is increased to 150 DEG C, a stirring device is started, heating is conducted continuously, the temperature of the
cracking reaction is controlled to range from 350 DEG C to 600 DEG C, the reaction time is 2-90 min, and after gas-
solid separation is conducted on a
cracking reaction product, condensation is conducted on the gas, and the
fuel oil with the high
alkane content is obtained. By means of the method for preparing the
fuel oil with the high
alkane content by co-cracking the non-edible
grease and the waste plastic, according to the problems that the plastic structure is compact and coking is serious in the cracking process, the swelling effect of the grease on the plastic and the characteristic that glycerin residues in the grease release
free state hydrogen atoms under specific cracking conditions are fully utilized. The stable and high-quality
liquid fuel oil of which the oil productivity is over 85% and the alkane content reaches up to 74% is obtained.