Examples flash vaporization, hydrocarbon mixture

Example 8-7 Flash Vaporization of a Hydrocarbon Liquid Mixture... 

For example, the DuPont process is reported to operate at a temperature in excess of 150°C and a pressure of about 8 MPa (1160 psi). Residence time in the reactor is short, on the order of 5-10 min and polymer concentration relatively high, up to 35% for low molecular weight grades. The sensible heat of the reaction mixture is employed to flash concentrate the solution from which the product is recovered in a devolatilizing extruder. Terminating agents and stabilizers are added in the extruder. Vapor from the flash step is condensed, cooled, and returned to the reactor. Residual hydrocarbon is removed in the extrusion step and purified for recycle to the polymerization. 

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