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Biodiesel acid pre-treatment

 
Posts: 122
Location: Sacramento
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I'm in a biodiesel class and the subject of acid pre-treating high-FFA oil with H2SO4 has come up.  However, neither the instructors nor any students know the why it works.  Can someone explain  the what and why to me?
 
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full time farm crew job w/ housing
https://permies.com/t/178213/jobs-offered/experiences/full-time-farm-crew-member
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