Crude oil turns cheap porous membrane into a sieve to refine itself without heat

A new porous polymer membrane can separate raw crude oil without requiring heat or a selective coating, as reported in Nature on June 24, 2026. This innovation leverages the self-assembly properties of heavy hydrocarbons within the membrane's pores. These hydrocarbons form channels, estimated to be less than 2 nanometers wide, which effectively enrich the permeate mixture with lighter, naphtha-range hydrocarbons. This process achieves a 30% reduction in energy costs and carbon dioxide emissions compared to traditional distillation methods. The development offers a more sustainable and cost-effective approach to crude oil refining, potentially impacting the petrochemical industry by lowering operational expenses and environmental footprint. The research highlights a novel application of material science in addressing energy efficiency challenges within the oil and gas sector.