Use of residual soapstock from the refining of edible vegetable oils to make biodiesel

Authors

  • J. Pereda Marín Departamento de Ingeniería Química. Facultad de Química. Universidad de Sevilla
  • F. Barriga Mateos Departamento de Ingeniería Química. Facultad de Química. Universidad de Sevilla
  • P. Álvarez Mateos Departamento de Ingeniería Química. Facultad de Química. Universidad de Sevilla

DOI:

https://doi.org/10.3989/gya.2003.v54.i2.255

Keywords:

Acidulated soapstock, Biodiesel, Fatty acid methyl esters, Oleinas, Vegetable oils

Abstract


A procedure to obtain Biodiesel from “Oleinas” is studied. Biodiesel is a suitable product to replace diesel oil currently used to power the Diesel engines. It consists of a mixture of methyl esters of the fatty acids presents as triglycerides in vegetables oils (olive, sunflower, soya, rape oils). As a result of the refining of these oils for their use as food, a waste product is formed, the “oleinas” (acidulated soapstock). The oleinas consist of a mixture of triglycerides and free fatty acids, the latter amounting to 50% or more of the mixture and are subject to a fluctuating market, therefore it exist at times a problem for their disposal. In our research work we have tried to obtain biodiesel from oleinas. The process resulting from our experimental work is as follows:
1. Sterification of the free fatty acids with methanol, by acid catalysis, centrifuging the reaction product and removal of the acid-methanol phase. Drying of the latter. At this stage we have a product containing about 70% of methyl esters.
2. Transesterification of the triglycerides present in the sterified product with methanol by alkaline catalysis, washing the reaction product with a water methanol solution. Centrifuging and removal of the water-methanol phase. At this stage a biodiesel product is obtained containing about 90% of methyl esters.
3. Fractional vacuum distillation of the 90% biodiesel gives a final product with a methyl esters content higher than 98%.

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Published

2003-06-30

How to Cite

1.
Pereda Marín J, Barriga Mateos F, Álvarez Mateos P. Use of residual soapstock from the refining of edible vegetable oils to make biodiesel. Grasas aceites [Internet]. 2003Jun.30 [cited 2024May25];54(2):130-7. Available from: https://grasasyaceites.revistas.csic.es/index.php/grasasyaceites/article/view/255

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Section

Research

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