Method of determining renewable carbon content while producing and blending biogenic-based fuels or blendstocks with fossil fuel in a refining or blending facility

A method of monitoring renewable carbon in fuel streams in a refinery, while co-processing a bio-feedstock with a fossil feedstock comprising:

• a. Blending bio-feedstocks comprising pyrolysis oil from pyrolysis and triglycerides and primary bio-feedstocks;
• b. Refining the blended bio-feedstocks using processes comprising (1) thermal cracking such as visbreaking and coking, (2) catalytic cracking, (3) hydrotreating, and (4) hydrocracking;
• c. Measuring renewable carbon content in the refinery streams and products selected from the group consisting of the following streams:
• Fluid Catalytic Cracking to fuel gas and Fluid Catalytic Cracking to gasoline;
• Fluid Catalytic Cracking to light bottom gasoline;
• LCO upgrading unit to fuel gas, diesel, Jet and gasoline;
• jet hydrotreater to fuel gas and jet;
• alky unit to gasoline;
• bio feedstock introduction to petroleum feedstock input to diesel hydrotreater;
• diesel hydrotreater output to off gas, naphtha and diesel blender;
• diesel blender to finished diesel;
• cetane improver stream to diesel blender;
• renewable diesel 99 to diesel blender;
• d. Determining the total renewable fuels produced,
• e. In situ adjustment of the renewable fuels produced in step d with renewable content to attain a desired percentage of total renewable content.