To make rapeseed oil fatty acid content is low, odourless, tasteless, colour and lustre is satisfied, transparent refined oil (i.e., salad oil), you must remove the contain small amounts of impurities.These impurities in the object itself is refined, some impurities such as free fatty acids, aldehydes, ketones, hydrocarbons, alcohols, sulfur compounds, palm oil refinery plantpigment, etc.;Some impurities in the refining process, such as high temperature oxidation and the role, can decompose to produce new pigment or stink substances, such as phospholipids, sugar, pigment and other colloid, etc.Increases the instability of refined oil, some impurities such as chlorophyll, trace metals, particularly copper and iron), etc.How to more fully to remove these impurities is rapeseed oil refining equipment to solve the main problem.
For easy to volatilize free fatty acids, aldehydes, ketones, hydrocarbons, drunk, sulphur compounds, such as colour line;Some impurities in the refining process, such as high temperature oxidation and the role, can decompose to produce a new color or odor material, such as phospholipids, sugar, pigment and other colloid, etc.Increases the instability of refined oil, some impurities such as chlorophyll, trace metals, particularly copper and iron), etc.So more fully to remove these impurities, is to solve the main problem of rapeseed oil refining.
Free of volatile fatty acids, aldehydes, ketones, drunk, hydrocarbons, and sulfur compounds, can borrow steam stripping to remove.This kind of deodorization or steam refining is the last step of oil refining.Before the oil itself must be harmful substances and in the process of refining processing decomposition of harm to remove oily substances, this is the former rapeseed oil processing.
The traditional chemical pretreatment of refined rapeseed oil, is made up of degumming, alkali refining and bleaching three-step implementation.Alkali refining, divided by alkali neutralization of free fatty acids...