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PERFORMANCE TABLE
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Absorbent purification (dry washing) of mono-alkyl esters with MAGNESOL, a synthetic magnesium silicate from The Dallas Group, was compared to the traditional water wash purification method followed by drying.
Purification with MAGNESOL proved very competitive to the troublesome water wash method. Methyl esters were derived from feedstocks of degummed soybean, yellow grease and rapeseed using methanol. The methyl esters were then separated from the glycerin and the excess methanol removed. One portion of each ester was water washed and dried, while another portion was treated and filtered with MAGNESOL. The resulting biodiesel from both the water wash and adsorbent treatment methods were evaluated for the parameters outlined by ASTM D6751 and EN 14214.
Parameter |
Specification |
Unwashed, |
1.5% MAGNESOL® R60 |
Washed |
untreated |
treated |
and dried |
| ASTM 6751 |
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| Free Glycerin, % |
0.020 max |
0.134 |
0.005 |
0.000 |
| Total Glycerin, % |
0.240 max |
0.297 |
0.162 |
0.162 |
| Carbon Residue, % |
0.050 max |
0.02 |
<0.010 |
<0.010 |
| Sulfated Ash, mass % |
0.020 max |
0.033 |
0.000 |
0.002 |
| EN 14214 |
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| Oxidation stability |
6.0 min |
0.61 |
2.25 |
0.49 |
| at 110°C, hours |
| Metals I Na + K, mg/kg |
5.0 max |
161 |
4 |
3.0 |
| Metals II Mg + Ca, mg/kg |
5.0 max |
6.0 |
0 |
5.0 |
| Soap, mg/kg |
None |
1593 |
12 |
30 |
| Parameter |
Specification |
Unwashed, |
1% MAGNESOL |
Washed and |
Unwashed, |
2% MAGNESOL |
Washed And |
| untreated |
(77°C/20 min.) |
dried |
untreated |
(77°C/20 min.) |
dried |
| ASTM 6751 |
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| Free Glycerin, % |
0.020 max |
0.033 |
0.005 |
0.002 |
0.063 |
0.004 |
0.037 |
| Total Glycerin, % |
0.240 max |
0.209 |
0.191 |
0.196 |
0.220 |
0.147 |
0.185 |
| Flash Point, °C |
130 min |
>190 |
200 |
163 |
179 |
168 |
>190 |
| Water and Sediment, vol. % |
0.050 max |
0.1 |
0.04 |
0.00 |
0.70 |
0.005 |
0.06 |
| Carbon Residue, % |
0.050 max |
<0.010 |
<0.010 |
0.050 |
0.060 |
0.000 |
0.013 |
| Sulfated Ash, mass % |
0.020 max |
0.000 |
0.000 |
0.005 |
0.007 |
0.002 |
0.004 |
| Kinematic Viscosity, cSt@40°C |
1.9 - 6.0 |
4.127 |
4.097 |
4.207 |
5.095 |
5.060 |
5.107 |
| Total Sulfur, mass % |
0.05 max |
0.00006 |
0.00002 |
0.00007 |
0.00146 |
0.00133 |
0.00139 |
| Cetane Number |
47 min |
51.0 |
51.3 |
55.9 |
57.8 |
57.4 |
60.3 |
| Cloud Point, °C |
Report |
0.0 |
0.0 |
0.0 |
10.0 |
9.0 |
9.0 |
| Copper Corrosion |
No. 3 max |
1a |
1a |
1a |
1a |
1a |
1a |
| Acid Number, mg KOH/gram |
0.80 max |
0.32 |
0.27 |
0.31 |
0.21 |
0.32 |
0.27 |
| Phosphorus, mass % |
0.001 max |
0.0007 |
0.0005 |
0.0006 |
0.0009 |
0.0008 |
0.0008 |
| EN 14214 |
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| Viscosity at 40°C, mm2/sec |
3.5 min - 5.0 max |
4.1 |
4.1 |
4.2 |
5 |
4.9 |
5.1 |
| Oxidation stability at 110°C, hours |
6.0 min |
0.5 |
3.7 |
0.2 |
0.5 |
4.3 |
0.2 |
| Methanol content, % |
0.2 max |
0.113 |
0.011 |
<0.001 |
0.116 |
0.002 |
<0.001 |
| Metals I Na + K, mg/kg |
5.0 max |
3 |
<1 |
5 |
16 |
<1 |
3 |
| Metals II Ca + Mg, mg/kg |
5.0 max |
0 |
0 |
0 |
0 |
<1 |
0 |
| Phosphorus content, mg/kg |
10.0 max |
<1 |
<1 |
<1 |
<1 |
<1 |
1 |
| Soap, mg/kg |
None |
651 |
4 |
13 |
2458 |
4 |
9 |
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