Researchers have developed a new method to transform agricultural and forestry waste into a key ingredient used in nylon manufacturing, offering a potential alternative to the fossil fuel based processes that currently dominate the industry.
A study published in the journal Nature describes how scientists successfully converted lignin, a tough plant material often treated as industrial waste, into adipic acid, one of the essential building blocks of nylon. The breakthrough could help reduce both waste and carbon emissions associated with plastic production.
Lignin is a natural polymer that gives plants their strength and rigidity. It is produced in massive quantities by the paper and biofuel industries, but most of it is burned as a low-value energy source. Despite being one of the most abundant organic materials on Earth, lignin has remained largely underutilized because of the difficulty of processing its complex structure.
The research team developed a hybrid system that combines chemical refining techniques with specially engineered microbes. The process begins by extracting lignin from wood chips and breaking it down into an oil rich in aromatic compounds. The oil then undergoes chemical treatment to remove unwanted oxygen containing groups before being converted into water soluble aromatic acids.
Engineered bacteria known as Pseudomonas putida are then used to convert these compounds into muconolactone, an intermediate chemical that can be transformed into adipic acid. According to the researchers, the method delivers significantly higher yields than previous lignin-based approaches.
In laboratory tests, the process achieved an adipic acid yield of about 26 percent by weight. Scientists believe further improvements could increase yields to as much as 57 percent. The technique also proved effective when applied to lignin obtained from different types of wood, including poplar, pine and birch.
The researchers say the discovery could pave the way for a more sustainable nylon industry by replacing petroleum derived raw materials with renewable biomass. If successfully scaled up, the technology could help turn millions of tons of plant waste into valuable industrial chemicals while lowering the environmental footprint of synthetic materials.
Nylon is widely used in clothing, automotive parts, packaging and industrial products. Developing greener methods to manufacture its key ingredients is considered an important step toward reducing dependence on fossil fuels and advancing a more circular economy.