The influence of branching on high-pressure vapor-liquid equilibria in systems of ethylene and polyethylene

Cloud-point curves and critical curves in fluid systems of ethylene + branched polyethylene were measured in an optical high-pressure autoclave equipped with sapphire windows and magnetic stirring in the temperature range 380-445 K and at pressures from 90 to 200 MPa. From the experimental results, it is concluded that the cloud-point curves of a system with a branched polyethylene are at significantly lower pressures (10-40 MPa) than the cloud-point curves of a system with a linear polyethylene with comparable molecular-weight distribution.