Course: BFM 202 Biodiesel Production

Lecture

Standards regulating diesel fuel CN
Credits
BFM 202 Biodiesel Production Unit 1 Reading has been adapted from "ENGY 131 Unit 1 Commentary: What is biodiesel?" by Southeastern Illinois College.

ENGY 131 Biodiesel Production course content by Southeastern Illinois College is licensed under a Creative Commons Attribution 3.0 Unported License. Except where indicated otherwise.

Standards regulating diesel fuel CN

Although biodiesel has a relatively high CN, NO_x exhaust emissions are known to increase with some biodiesel. The CN is improved through the use of additives called "cetane improvers". The relation between the CN and engine emissions rely upon many factors including the technology level of the engine. Older engines have lower fuel injection pressure causing increased CN. Diesel and biodiesel fuels must meet American Society of Testing and Materials (ASTM) specifications for CN, designated as ASTM D613 and ISO 5165, respectively. ASTM D975 requires a minimum CN of 40 for petrodiesel while ASTM D6751 specifications for biodiesel require a minimum of 47.