After bleaching the oil is practically pure, but still
contains small quantities of original odoriferous matter.
The oil bleached by means physical bleaching is pumped in the
Deodorization Plant. The oil is distilled at 240-270°C by means of steam and, under
pressure and under vacuum for 30 - 60 minutes. Deodorization removes odorous
substances, free fatty acids, and molecules generated from previous processes
that give an unpleasant smell oil. During the Deodorization process, the
peroxide value of oil is reduced down as minimum as possible.
The obtained oil (or oil blend) is odorless, tasteless, colorless and is
ready for use in Soap Manufacturing to produce white soap.
After Refining, Bleaching and Deodorization, the crude oil is
transformed in RDB oil (Refined Bleached and Deodorized Oil). In Soap
Manufacturing this process is widely diffuse for Palm Oil and their by-product,
like Palm Olein and Palm Stearine.