Environmental Stewardship at Its Best

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Up to 80%

reduction in life cycle greenhouse gas emissions.

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2.3 Billion

pounds of rendered and recycled material converted each year.

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290 Million

gallons of renewable diesel produced each year.

The Making of Renewable Diesel

  • How is renewable diesel different from biodiesel?

    Renewable diesel has a different molecular structure from biodiesel, which is a methyl-ester primarily made from soybean oil. 

    Renewable diesel is a true hydrocarbon, just like diesel, and can be used anywhere diesel is used without modifications to engines or pipelines. 

    It has an energy density value equivalent to ultra-low sulfur diesel (ULSD), which is a cleaner burning, lower emission fuel.

    It performs well in both cold and warm climates.

  • How are inedible animal fats used to make renewable diesel?

    Inedible meat and fat are collected from supermarkets, butchers, meat processors and other food service establishments in North America and transported to rendering operations, such as Darling Ingredients’ network of plants. There, the by-products are ground and cooked to separate the fats from the protein material. These recycled fats are used to produce biofuels.

  • How is used cooking oil used to produce renewable diesel?

    The restaurant industry in the U.S. generates an estimated 2.3 billion pounds of used cooking oil annually. Companies like Darling Ingredients provide restaurants, grocers and other food service establishments with storage tanks or bins to store used fryer oil. During regularly scheduled visits, the service company pumps the oil into dedicated trucks and transports it to their processing plants, where it is cleaned of debris or solid matter and heated to evaporate any water.  The used cooking oil is transported to our Diamond Green Diesel facility, where Valero manufactures the renewable diesel.

  • How does Diamond Green Diesel turns fats into renewable diesel?

    The used cooking oil and inedible animal fats are pretreated to remove impurities. Next, these fats are processed into renewable diesel by:

    • Hydrotreating: Using high pressure hydrogen to remove the oxygen (which is converted to water).
    • Isomerization: A chemical process that changes the structure of the molecules without changing the number of atoms. This enables the fuel to be used in cold weather.
    • Fractionation: A chemical process to separate the liquid into finished products.
  • How is renewable diesel shipped?

    Because of its molecular similarity to traditional diesel, renewable diesel can be distributed using existing pipelines used to transport petroleum products, no changes are needed. 

  • Where is renewable diesel used?

    The fuel is sold primarily in California, Canada and Europe, which are markets that mandate low-carbon fuels. 

Low Carbon Fuel Standard (LCFS)

California enacted this regulation in 2007 by the California Air Resources Board (CARB) to help reduce the state’s greenhouse gas emissions. It is designed to encourage the use of lower-carbon fuels. Similar mandates have been adopted or are being considered in other states and countries.

It’s Good For Us

Renewable diesel is better for the environment. 

  • Cleaner exhaust
  • Has lower emissions
  • Keeps waste oils and inedible fats out of landfills.

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