brown grease biodiesel plant
When a feedstock carries less than 3% or 4% free fatty acids, most people just add more catalytic agent, let the free fatty acids turn to soap, and then change the soap. From 3% or 4%, up to 10% or 15% free fatty acids, a usual procedure is to use vacuum distillation to separate the free fatty acids from the oil. Then the brown grease biodiesel plant can be processed generally, and the free fatty acids can be sold as animal feed or esterified separately.
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