Provided herein are various embodiments of systems for casting thin metal plates and sheets. A dielectric layer thick enough to contain both interconnect and contact structures is formed on a substrate. The second value is greater than the first value. 8 in a molar ratio of SiO2Ln2O3 of the Si in terms of SiO2 to the oxide Ln2O3, and the sintered body has a relative density of 85 to 99. An aromatic-lean hydrocarbon stream, which is the retentate portion of the original hydrocarbon feed, remains on the retentate side of the supported ionic liquid membrane.