The invention discloses a method for removing
solid impurities of catalytic
slurry oil by low-temperature coalescence, which comprises the steps of heating, dehydrating, adding a liquid assistant, mixing, heating a
solid assistant, mixing, and carrying out
solid-liquid separation, thereby obtaining the purified catalytic
slurry oil with low ash content in which solid impurities are removed. According to the invention, through the combined action of the liquid auxiliary agent and the solid auxiliary agent, tiny catalyst solid particles are aggregated into large particles, so that impurities areeasy to remove; the solid impurities in the catalytic
slurry oil are separated out in a solid form, the process technology is novel, the operation is easy, and continuous separation can be achieved;the separated solid
slag is in a loose
solid state in appearance, is convenient to mix and burn with fire
coal, and is environment-friendly; no concentrated solution or other liquid
hazardous waste isgenerated, and no environmental
pollution risk is caused; and the method has the advantages of mild
process conditions, simple equipment, easy operation,
continuous production, thorough solid-liquidseparation and high finished product yield, and the yield of the purified catalytic slurry oil obtained after separation reaches 99% or above.