Method for recovering hexane from production of high-density polyethylene

The invention relates to a method for recovering hexane from the production of high-density polyethylene, and mainly aiming to solve the problems on the loss of the hexane and the pollution of the discharged hexane to environment in the prior art. The method comprises the following steps: (a) feeding hexane flow 5 into a catalyst preparation tank 1, and mixing the hexane flow 5 with a catalyst, wherein a prepared catalyst 9 is obtained at the bottom of the catalyst preparation tank 1, and a hexane exhaust 6 is obtained on the top of the catalyst preparation tank 1; (b) feeding the hexane exhaust 6 into a suction tank 3 of a compressor to obtain a hexane exhaust 10 with pressure being stabilized; and (c) feeding the hexane exhaust 10 into a gas compressor 4, increasing the pressure to obtain a high-pressure hexane exhaust 11, and feeding the high-pressure hexane exhaust 11 into a subsequent drying gas system. Due to adoption of the technical scheme, the problems are well solved. The method disclosed by the invention can be applied to the industrial production on the recovery of the hexane from the production of the high-density polyethylene.