Neste MY Renewable Diesel (formerly NExBTL) is a vegetable oil refining fuel production process commercialized by the Finnish oil and refining company Neste. Whether as an admixture or in its pure form, Neste MY Renewable Diesel is able to supplement or partially replace diesel fuel without problems. Neste MY Renewable Diesel guarantees that every gallon sold meets ASTM D975 and EN 15940 specifications in compliance with OEM standards.
Despite the former name BTL, the feedstock is vegetable oil and waste animal fats, not whole plants. However, fuel quality is equal to the synthetic Fischer-Tropsch BTL and GTL diesel fuels.
Process
Neste Renewable Diesel is produced in a patented vegetable oil refining process. Chemically, it entails direct catalytic hydrodeoxygenation (hydrogenolysis) of plant oils, which are triglycerides, into the corresponding alkanes and propane. The glycerol chain of the triglyceride is hydrogenated to the corresponding C3 alkane, propane — there is no glycerol sidestream. This process removes oxygen from the oil; the diesel is not an oxygenate like traditional transesterified FAME biodiesel. Catalytic isomerization into branched alkanes is then done to adjust the cloud point in order to meet winter operability requirements. As it is chemically identical to ideal conventional diesel, it requires no modification or special precautions for the engine.
Production
Two refineries in Porvoo, Finland were brought on stream in 2007 and 2009, each with a capacity of 0.2 million tons per year. Two larger refineries, with annual production of 0.8 million tons both, were brought on stream in Singapore and Rotterdam in 2010 and 2011, respectively.
Emissions
Neste has estimated that the use of NExBTL diesel cuts greenhouse gas emissions by 40 to 90 percent in comparison to fossil based diesel.
Due to the chemistry of the process, the renewable diesel is pure alkane and contains no aromatics, oxygen (although oxygen would have promoted cleaner combustion) or sulfur.
Cloud point
The cloud point (or gel point) can be adjusted down to −40 °C (−40 °F) during the manufacturing process, compared to petrodiesel's cloud point of −30 °C (−22 °F), which could improve the cloud point of diesel when blended. The cloud point is the temperature when the wax precipitates out of the fuel in the form of small wax crystals, making the fuel cloudy and more difficult to move within the fuel lines and systems of vehicles. The lower the cloud point of a particular fuel is, the more suitable it is in colder environments.
Feedstocks
A mix of palm oil, rapeseed oil, and waste fat from the food industry can be used. Initially, palm oil was the principal (90%) feedstock, although its share was reduced to 53% by 2013 and to less than 20% by 2017.
However, the EU biofuels industry has increased its use of palm oil by 365% during the years 2006–2012, from 0.4 to 1.9 million tonnes per year, and the trend is increasing. Also note that categorising Palm Fatty Acid Distillate, PFAD, as waste is controversial since it can be used to make e.g. soap, candles and animal fodder. In the UK PFAD is classified as a bi-product). PFAD is also omitted from sustainability requirements regarding biodiversity and high carbon stock areas (HCV).
Palm oil may endanger the carbon neutrality of the fuel if forest is cleared and swamps drained to make way for palm plantations. In response to this concern, Neste has joined the Round Table on Sustainable Palm Oil (RSPO) to certify that the palm oil is produced in a carbon-neutral, environmentally responsible manner. Neste purchases most of its palm oil from IOI, but requires a separate production chain for the RSPO-certified palm oil, in order not to create demand for rainforest destruction.