Vegetable Oil as a Fuel Source
Transesterification of vegetable oil was pioneered as early as 1853 by esteemed scientists E. Duffy and J. Patrick, well before the operational debut of the first diesel engine. Rudolf Diesel's inaugural prototype, a solitary 10 ft (3 m) iron cylinder accompanied by a base-mounted flywheel, achieved autonomous power for the first time on August 10, 1893, in Augsburg, Germany. This momentous occasion led to the establishment of "International Biodiesel Day" in commemoration. Diesel later showcased his groundbreaking engine, earning the prestigious Grand Prix award at the 1900 World Fair in Paris, France.
This engine served as a testament to Diesel's foresight as it ran on peanut oil, a biofuel that, although not transesterified into biodiesel, showcased his belief in the future potential of biomass fuel. In a 1912 speech, Diesel proclaimed, "the use of vegetable oils for engine fuels may seem insignificant today but such oils may become, in the course of time, as important as petroleum and the coal-tar products of the present time."
During the 1920s, diesel engine manufacturers made modifications to accommodate the lower viscosity of petrodiesel, a fossil fuel, instead of vegetable oil, a biomass fuel. The petroleum industry's ability to produce fuel at a significantly lower cost led to their dominance in the fuel markets, resulting in the near eradication of the biomass fuel production infrastructure for many years. It is only recently, with the growing concerns over environmental impact and the narrowing cost gap, that biomass fuels such as biodiesel have emerged as a viable alternative.
In 1977, Brazilian scientist Expedito Parente developed an early patented process for producing biodiesel through transesterification. His work became part of a broader international effort to turn vegetable oils and animal fats into fuels with repeatable properties suitable for compression-ignition engines.
Research into the utilization of transesterified sunflower oil and its refinement to meet diesel fuel standards was initiated in South Africa in 1979. By 1983, the process for producing high-quality, engine-tested biodiesel was completed and shared worldwide. Gaskoks, an Austrian company, acquired the technology from South African Agricultural Engineers, and in November 1987, they established the first biodiesel pilot plant, followed by the first industrial-scale plant in April 1989, boasting a capacity of 30,000 tons of rapeseed per annum.
Throughout the 1990s, commercial biodiesel plants appeared across Europe, including facilities in the Czech Republic, Germany, Sweden, and France. Rapeseed-based biodiesel was introduced in low-level blends and in higher blends for selected captive fleets. By 1998, the Austrian Biofuels Institute had identified commercial biodiesel projects in 21 countries, demonstrating that biodiesel was moving from research and pilot production into a global fuel industry.
In September 2005, Minnesota became the first U.S. state to put a statewide B2 biodiesel requirement into effect. The program later expanded: current state requirements generally call for B20 from mid-April through September and B5 during the rest of the year, with seasonal transition provisions.