By Pira International Ltd
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Extra info for Advances in Biodiesel
Biodiesel, as used in compression-ignition engines, is defined as the mono alkyl esters of long-chain fatty acids derived from vegetable oils or animal fats. 1 below is for pure (100%) biodiesel, before being used or blended with petrodiesel. 1 Specification for biodiesel (B100) – ASTM D6751-07a Property ASTM method Limits Units Calcium and magnesium, combined Flash point (closed cup) Alcohol control (one of the following must be met): 1. Methanol content 2. Flash point Water and sediment Kinematic viscosity, 40C Sulphated ash Sulphur S 15 grade S 500 grade EN 14538 D 93 5 max.
As biodiesel has a low sulphur content, NOx emissions can be reduced through the use of catalytic converters to less than the NOx emissions from conventional diesel engines. Nonetheless, the NOx tailpipe emissions of biodiesel after the use of a catalytic converter will remain greater than the equivalent emissions from petrodiesel. As biodiesel contains no nitrogen, the increase in NOx emissions may be due to the higher cetane rating of biodiesel and higher oxygen content, which allows it to convert nitrogen from the atmosphere into NOx more rapidly.
Consumer co-ops work with dealers in the towns of Dedham, Acton and Newton, which buy a biodiesel blend from World Energy. 34 a gallon. Most customers on the South Shore using biodiesel to heat their homes are buying it from Mass Biofuel, a division of Fisher-Churchill, an oil dealer in Dedham. The company started delivering a blend of 10% biodiesel with low-sulphur diesel – a cleaner form of home heating oil – in October 2004. It now has about 330 customers using either the low-sulphur B10 or the B20 blend it introduced in 2006.
Advances in Biodiesel by Pira International Ltd