Method for preparing low-pour point, high-aromatic, and environmental-friendly rubber oil by combining extraction and dewaxing

A method for preparing an environmental-friendly rubber oil by combining extraction and dewaxing,

• comprising the following steps:
• (1) conducting the extraction in an extraction tower, wherein a primary extraction solvent is introduced into an upper section of the extraction tower, a raw oil is introduced into a middle-lower section of the extraction tower, and a secondary extraction solvent is introduced into a lower section of the extraction tower, wherein the primary extraction solvent is N-methylpyrrolidone (NMP), the raw oil is an extract oil, and the secondary extraction solvent is a C7-C12 alkane;
• (2) subjecting a material at a bottom of the extraction tower to a first solvent recovery to obtain a secondary extract oil;
• (3) mixing a substance flowing out from a top of the extraction tower, a solubilizer and a part of the primary extraction solvent sent by a pump in a static mixer, subjecting a resulting mixture to cooling to a temperature of −15° C. to 10° C. in a cooler, and then filtering in a filter to obtain a wax paste and a filtrate, wherein the solubilizer is at least one selected from the group consisting of benzene, toluene, and xylene;
• (4) subjecting the wax paste to a second solvent recovery by a first heating evaporation to obtain a wax;
• and
• (5) subjecting the filtrate to a third solvent recovery by a second heating evaporation to obtain a dewaxed oil, namely the low-pour point, environmental-friendly rubber oil.