Table 2. Product Gas and Oil Yields (wt %) from the Supercritical Water Liquefaction of Different Plastics in Relation to Plastic:Water Ratios at Conditions of 450 °C and Final Pressure of 33 MPa with a Residence Time of 60 min.

	plastic:water ratio
	1:3 (wt %)	1:4 (wt %)	1:6 (wt %)	1:9 (wt %)
Polystyrene
gas yield	1.2	1.2	1.3	1.3
oil yield	97.6	98.2	98.2	98.2
solid	1.4	0.6	0.5	0.5
mass balance	100.2	100.0	100.0	100.0
Polypropylene
gas yield	2.2	2.2	2.3	2.6
oil yield	97.4	97.5	97.4	97.2
solid	0.5	0.3	0.3	0.2
mass balance	99.9	100.0	100.0	100.0
Low-Density Polyethylene
gas yield	2.0	2.2	2.3	2.7
oil yield	98.0	97.8	97.7	97.3
solid	<0.1	<0.1	<0.1	<0.1
mass balance	100.1	100.1	100.1	100.1