|
ASTM D-6751 standards
for
bio-diesel
|
1>2>3>4>5 |
| Flash point (closed cup) |
130°C min. (150°C average) |
| Water and sediment |
0.050% by vol., max. |
| Kinematic viscosity at 40°C |
1.9-6.0 mm2/s |
| Ramsbottom carbon residue, % mass
|
0.10 |
| Sulfated ash |
0.020% by mass, max. |
| Sulfur |
0.05% by mass, max. |
| Copper strip corrosion |
No. 3 max |
| Cetane |
47 min. |
| Carbon residue |
0.050% by mass, max. |
| Acid number -- mg KOH/g |
0.80 max. |
| Free glycerin |
0.020 % mass |
| Total glycerine (free glycerine
and unconverted glycerides combined) |
0.240% by mass, max. |
| Phosphorus content |
0.001 max. % mass |
| Distillation |
90% @ 360°C |
Flash Point and
Safety
Bio-diesel, with a
flash point of 150
°C, is not as
readily ignited as
petroleum diesel (64
°C) and far less so
than the explosively
combustible gasoline
(-45 °C).
Indeed, it
is classified as a
non-flammable liquid
by the OSHA,
although it will of
course burn if
heated to a high
enough temperature.
This property makes
a vehicle fueled by
pure biodiesel far
safer in an
accident.
Disadvantage
Traditional bio-diesel gels at
higher temperatures
(around 0 °C) than
petroleum diesel,
which limits its use
in pure form in cold
climates. New
technology has been introduce to allow use of bio-diesel in
low temperature environment.
Bio-degradable
and Renewable in a variety of by-products
Unlike petrodiesel,
biodiesel is
biodegradable and
non-toxic, and it
significantly
reduces toxic and
other emissions when
burned as a fuel.
The most common form
uses methanol to
produce methyl
esters, though
ethanol can be used
to produce an ethyl
ester biodiesel. A
byproduct of the
transesterification
process is the
production of
glycerol.
1>2>3>4>5
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