Friday, December 18, 2009

How do you make your own vegetable oil from scratch?

This is a very serious question that I would like to know the answer to. Hopefully someone out there has the answer.How do you make your own vegetable oil from scratch?
How to make vegetable oils?





Oil refining means improving the quality and value of the product. The main properties important for fats and oils are taste, smell, colour, shelf life and consistency. Refining may involve over ten steps depending on the type and quality of the feedstocks and the desired products.





CRUDE OIL PROCESS


Purification:


Reduction of free water and removal of solid impurities through centrifugal separation.





Water degumming:


Removal of phosphatides in seed oils through centrifugal separation after precipitation with water.





Special (acid) degumming:


Removal of gums and other impurities in seed oils through centrifugal separation after precipitation with acid and water.





Cold degumming:


In some cases the degumming process is carried out at lower temperatures to also achieve crystallization and reduction of waxes in sunflower oil.











REFINING PROCESSES





Chemical refining:


Neutralization, bleaching and deodorization.





Physical refining:


Degumming or acid conditioning, bleaching and deacidification/deodorization.





Acid conditioning:


Precipitation of gums and trace metals by acid preceding neutralization or bleaching.





Neutralization:


Removal of free fatty acids, gums, colour pigments and oxidizing bodies through centrifugal separation after reaction with lye followed by water washing and separation of residual soap.





Bleaching:


Removal of colour pigments, oxidizing bodies and residual gums through adsorption in bleaching clay followed by separation of the spent clay.





Deodorization:


Removal and recovery of fatty acids and other volatile impurities through vacuum steam distillation as well as bleaching through heat treatment. The specific removal of fatty acids is referred to as deacidification.











MODIFICATION PROCESSES





Hydrogenation:


Selective saturation of double bonds through pressurization and reaction with hydrogen, which gives a higher melting point altered melting characteristics and a better oxidation stability.





Fractionation:


Production of high and low melting fractions from one feed stock through chilling and crystallization followed by filtration or centrifugal separation. The specific removal of waxes from sunflower oil is referred to as dewaxing.





Margarine production:


Chilling and crystallization of a mixture of fats, oils and water/milk solutions to create various solid fats and spreads.











BY-PRODUCT PROCESSES





Lecithin drying:


Drying of phosphatides recovered from water degumming in scraped surface heater under vacuum followed by bleaching with hydrogen peroxide.





Soapstock splitting:


Splitting of soap from neutralization to recover crude fatty acids (acid oil) through reaction with mineral acid followed by decantation.





Earth deoiling:


Recovery of low grade oil from spent bleaching earth through extraction with hot water followed by decantation or separation.How do you make your own vegetable oil from scratch?
poor wee scratch
Best, go surf the web, dunno.
I don't know ... .but I'll bet it's pretty labor and equipment intensive.
Vegetable oil is a factory made product, so you can't make it from scratch.





Let's have your recipe that you put together in an hour!
You can extract the oil from seeds (sunflower, rape, grape etc) in a similar manner to the process used for olive oil. The only snag is that it has to be pressed and the machinery needs to be able to be capable of exerting immense pressure. You also need a lot of raw materials.
Did you bollocks!
It's cheaper and more energy efficient to buy it from the store than to make it yourself.

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