The biodiesel and biofuel industry is demonstrating a disturbing trend of unsafe operations. The biodiesel industry is experiencing one fire/explosion incident EVERY two-and-a-half months.
Last Friday, there was an explosion at a biodiesel plant in Chicago injuring two workers. The following video from NBC provides details of the incident.
http://tinyurl.com/lmpug7
According to the video, the explosion was caused by mixing of glycerin and sulfuric acid. Recognizing incompatibility between chemicals is often not intuitive. For the benefit of the readers of this blog and biodiesel manufactures, below is an incompatibility matrix for commonly used chemicals in biodiesel plants.

http://risk-safety.com/explosion-at-...ant-july-2009/