Chinese researchers have unveiled a potentially transformative oil refining technology that could dramatically reduce the energy required to separate crude oil into useful components. Scientists from the Dalian Institute of Chemical Physics have developed a “molecular refining” method that, in laboratory tests, consumed approximately 91% less energy than conventional distillation, the cornerstone of the global petroleum industry for over a century. The breakthrough, published in the journal National Science Review, offers a glimpse of a future where refineries operate at or near room temperature, slashing both operational costs and carbon emissions while extracting higher value from every barrel of crude.
The fundamental problem with traditional refining is its reliance on heat. Crude oil is a complex mixture of thousands of different hydrocarbon molecules. To turn it into usable products like gasoline, plastics, and chemical feedstocks, refineries must first separate this mixture into distinct fractions. The conventional method, distillation, exploits the fact that different molecules have different boiling points. By heating crude oil repeatedly—vaporizing it and then condensing the vapors at various temperatures—refiners can isolate specific cuts of the mixture. This process, however, is extraordinarily energy-intensive. Heating massive volumes of crude oil to hundreds of degrees Celsius and then cooling them back down accounts for a substantial portion of a refinery’s total energy consumption and operating costs. Furthermore, distillation is relatively imprecise; it cannot cleanly separate molecules that have very similar boiling points, meaning some valuable components end up in lower-value streams.
The new approach abandons heat-driven separation in favor of molecular sieving. The researchers, led by a team at the Dalian Institute of Chemical Physics, have designed a system that separates crude oil components at the molecular level using metal-organic framework (MOF) membranes. These membranes function as incredibly precise molecular sieves, with pores and surface properties engineered to allow certain molecules to pass through while blocking others. The process is described as “cascade membrane separation,” because it uses multiple membranes in sequence, each performing a progressively finer sorting task.
The separation begins with a size-based sorting stage. In the first membrane, the system screens molecules according to their physical dimensions. The differences in size between molecules can be extraordinarily small—on the order of one-tenth of a nanometer. This membrane is designed to separate straight-chain and single-branched alkanes, which are valuable precursors for producing ethylene, from the rest of the mixture. Ethylene is one of the most important building blocks in the petrochemical industry, used to make everything from plastics to antifreeze.
The second stage tackles a far more challenging separation. The remaining molecules are even closer in size, with differences of less than one-hundredth of a nanometer. Here, the membrane relies not on size alone but on surface chemistry to recognize and sort molecules. This second membrane distinguishes between aromatic compounds—which are crucial intermediates for manufacturing plastics, resins, and synthetic fibers—and multi-branched alkanes and cycloalkanes, which are better suited for use in gasoline production. To achieve this level of precision, the researchers used a technique called tannic acid micro-etching to continuously fine-tune the membranes’ pore sizes and chemical properties.
The laboratory results were striking. When the two membranes were used in series to process a simulated light naphtha mixture containing 15 different components, the system successfully separated the mixture into three distinct groups of high-value products. The recovery rate for these valuable components was between 85% and 90%, indicating that the process was not only energy-efficient but also effective at capturing the desired molecules. Most importantly, because the process eliminated the need for repeated heating, vaporization, and condensation, it consumed approximately 91% less energy than traditional distillation under the tested conditions.
The implications of this energy reduction are enormous. Oil refining is one of the world’s most energy-intensive industries. Global refining operations are estimated to emit roughly 1.3 gigatons of carbon dioxide annually. A technology that could cut the energy required for the separation stage by more than 90% would represent a massive step toward decarbonizing the sector. Beyond emissions, lower energy consumption translates directly into lower production costs, which could improve the economic viability of refineries and potentially lower prices for fuels and petrochemical products. The increased precision of membrane separation also means that refineries could extract more value from each barrel of crude, directing molecules to their highest and best use rather than lumping them into broader distillation cuts.
However, significant challenges remain before this technology can be deployed at industrial scale. The researchers are careful to note that their results come from laboratory testing on a simulated mixture. Real crude oil is a far more complex and “dirty” feedstock, containing sulfur, nitrogen, metals, and other impurities that could foul or degrade the delicate membranes over time. The critical unanswered question is whether these MOF membranes can be manufactured at sufficient scale and durability to handle the immense volumes processed by commercial refineries. A typical large refinery processes hundreds of thousands of barrels of crude oil per day; scaling membrane technology to that throughput would require vast surface areas and robust engineering solutions.
The research team acknowledges these hurdles but sees a clear path forward. They describe their graded molecular sorting approach as a “potential platform for petrochemical refining” that could maximize value extraction while dramatically improving energy efficiency. The next steps would involve testing the membranes with real crude oil fractions, assessing their long-term stability, and engineering modular systems that could be integrated into existing refinery configurations. If these challenges can be overcome, the technology could offer a dual benefit: reducing the environmental footprint of one of the world’s most carbon-intensive industries while simultaneously improving its economic efficiency. For an industry facing mounting pressure to decarbonize, the promise of refining oil with 91% less energy is a compelling vision—one that, for now, remains on the lab bench but could one day transform the refinery floor.
