Renewable Fuels Processing Guide
Feedstock Guide
Chapter from the Renewable Fuels Processing Guide.
RENEWABLE FEEDSTOCK CHARACTERIZATION
Common Renewable Feedstocks
| Feedstock | Source | Typical FFA % | Typical Metals (ppm) | CI Score (gCO2e/MJ) | Availability | Processing Challenges |
|---|---|---|---|---|---|---|
| Soybean Oil | Agricultural crop | <0.5% | <1 | ~40-50 | High (US, Brazil) | Low CI benefit, food vs. fuel debate |
| Canola/Rapeseed Oil | Agricultural crop | <0.5% | <1 | ~35-45 | High (Canada, EU) | Similar to soy, moderate CI |
| Palm Oil | Tropical tree crop | 2-5% | 2-10 | 50-60 (w/o ILUC penalty) | Very high (SE Asia) | ILUC concerns, EU restrictions |
| Used Cooking Oil (UCO) | Waste collection | 5-15% | 5-50 | ~15-25 | Moderate, growing | FFA, metals, polymers, water |
| Animal Fats (Tallow) | Rendering plants | 5-20% | 10-100 | ~20-30 | Moderate | FFA, metals, sulfur, variability |
| PFAD (Palm Fatty Acid Distillate) | Palm refining byproduct | 80-90% | 5-30 | ~15-25 | Moderate (SE Asia) | Very high FFA, corrosion concerns |
| Tall Oil | Pulp/paper byproduct | 20-40% | 5-20 | ~20-30 | Limited | Resin acids, pitch, variability |
| Brown Grease (trap grease) | Waste collection | >50% | 50-200+ | ~5-15 | Limited | Very dirty, extensive pretreatment |
| Camelina Oil | Oilseed crop (non-food) | <2% | <5 | ~15-25 | Growing (US, Canada) | Low yield per acre, niche crop |
| Algae Oil | Cultivated algae | Variable | Variable | ~15-30 (target) | Very limited (R&D stage) | Economics, scale-up challenges |
Feedstock Quality Parameters
| Parameter | Method | Target for Processing | Impact if Out-of-Spec | Typical Pretreatment |
|---|---|---|---|---|
| Free Fatty Acid (FFA) | AOCS Ca 5a-40 | <5% (prefer <2%) | Corrosion, catalyst poisoning | Acid degumming, esterification |
| Phosphorus | ICP-OES | <5 ppm | Catalyst deactivation, fouling | Degumming (water, acid, enzymatic) |
| Alkali Metals (Na, K) | ICP-OES | <1 ppm | Catalyst poisoning (permanent) | Water wash, ion exchange, bleaching |
| Alkaline Earth (Ca, Mg) | ICP-OES | <1 ppm | Catalyst bed plugging | Same as alkali metals |
| Iron | ICP-OES | <1 ppm | Catalyst activity loss | Chelation, bleaching earth |
| Moisture | Karl Fischer | <500 ppm | Catalyst damage, corrosion, H2 consumption | Vacuum drying, dehydration |
| Chloride | ASTM D4929 | <1 ppm | HCl formation, corrosion in overhead | Water wash, adsorption |
| Polymerized Triglycerides | GPC | <5% | Exchanger fouling, high ΔP | Filtration, distillation |
Source: Renewable_Fuels_Processing_Guide_v1.xlsx · sheet “Feedstock Guide”
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