Polyethylene solid-liquid separation device and method using pentane as solvent

Abstract

The application provides a pentane solvent polyethylene solid-liquid separation device and method, relates to the polyethylene separation field, and comprises a rotary pressure filter, a filter area, a washing area, a drying area and a discharge area are arranged in the rotary pressure filter, the filter area is provided with a polyethylene slurry input port, the washing area is connected with a pentane heat exchanger, the filter area and the washing area are both connected with a solvent buffer tank, the drying area is connected with a pentane vaporizer and a dry pentane collecting tank, a discharge valve is arranged at a discharge port of the discharge area, the discharge valve is connected with a filter cake buffer isolation bin, and the filter cake buffer isolation bin is connected with a discharge conveyor.Compared with the prior art, the polyethylene solid-liquid separation device adopts pentane as a solvent, which can be used as a washing liquid and a drying gas, the purity of the polyethylene product is improved, the separation cost of nitrogen and the solvent after drying is reduced, the rotary pressure filter is adopted, the occupied area is small, the rotating speed is low, the energy consumption is low, the failure rate is low, the degree of automation is high, and the production cost is reduced.

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