Preparation of isopentane solvent for polyolefins by separation technique

Separation process using one kind of method for preparing a polyolefin isopentane solvent or in a light hydrocarbon refinery byproduct ethylene plant cracking C5 fraction separated after the alkane as raw material, the raw material 1-pentene content isopentane content of less than 0.000425; light after removal column, separating off the rectification column and the weight of the final product column to obtain a polyolefin with isopentane solvent; number of theoretical plates of the column for removing the lighter 20 to 100, an operating pressure of 0.6-1.5 MPa, a top temperature of 20-60 deg.] C, a bottom temperature of 70-190 deg.] C; number of theoretical plates of the column is 30-110 weight off, the operating pressure of 0.1-1.0 MPa, a top temperature of 20-80 deg.] C, column bottom temperature of 80 -190 deg.] C; number of theoretical plates of the column of 40 to 140 products, the operating pressure of 0.1 to 0.6 MPa, a top temperature of 20-60 deg.] C, a bottom temperature of 30-150 ℃; olefin content lower than 30 ppm or isopentane, indicators have reached It means a polyolefin production requirements.