The type of vegetable oil refinery plant can be divided into two type in general：Batch type vegetable oil refinery plant and Continuous oil vegetable oil refinery，the follwing article is mainly introduce these types of vegetable oil refinery plant.
Vegetable oil refinery plant
1,Batch type vegetable oil refinery plant
In batch oil refinery process or cooking oil refinery process, a measured quantity of oils is processed in sequence of neutralizing, bleaching & deodorizing.
For plants capacity from 5 to 25 tons per day, batch process is recommended being low cost and easy to operate.
Crude oil obtained from expellers or solvent extraction plant contains foreign impurities such as mucilage, gums, coloured & unfiltered matter from the seed. Also Free Fatty Acids (F.F.A.) which tend to deteriorate the oil on storage, thus making it unfit for edible purpose. The batch refining process consists of following section:
Neutralizing / Degumming
Batch refinery plant
First Stage of Refining is to Remove Free Fatty Acids(F.F.A.) wih caustic Soda Treatment called Neutralizing Process Thereafter further processed in the bleaching section under vacuum and treated with bleaching earth and activated carbon for removing colour .Finally it will be Deodorized under high vacuum and high temperature to remove the odour from the oil. The Edible obtained in a batch refinery is of good quality meeting all requirement of International Standard. However in case of sunflower and rice bran oil, there is one more process of Dewaxing after bleaching Process.
The equipment involved are Neutralizer, Bleacher, Deodorizer, Heat Exchanger, High &low vacuum equipment & Filters. Shreeji plant with batch process have been operating at number of places, processing variety of vegetable oils.
Batch refinery plant
2,Continuous oil vegetable oil refinery plant
Basic process of refining is same in both batch & continuous refinery. Only difference is instead of a measured batch, crude oil is processed continuously with constant stream of flow. In between required utilities & chemicals are added continuously in measured quantity. Crude oil from obtained from expellers, solvent extraction plant contains foreign impurities such as mucilage, gums and unfiltered proteinous matter from the seed. It also contains gums which making it unfit for edible purpose. Basic stages of the process are as below:
Dewaxing & Deodorizing
Vegetable oil refinery plant
2.1 Degumming and neutralization section
The crude oil is pumped to Neutraliser from oil mill or storage tank & first it is treated with weak solution of phosphoric acid or other suitable degumming agent for removing gums.
Thereafter oil is further treated with measured quantity of alkali (NaoH)depending upon free fatty acid (F.F.A.) in crude oil. In this process soap will be separated.
Next process is hot water wash to the oil to remove traces of soap particle & free alkali.
The oil obtained will be light in colour, free from soap stock & called as washed
2.2 Bleaching section
In this process excess colour from the oil is removed. The neutralized washed oil is pumped into the Bleacher vessel operating under vacuum.
The oil is first heated to remove excess moisture and thereafter it will be treated with predetermined quantity of bleaching earth & activated carbon.
Thereafter the oil will pass through a filter media (Pressure leaf / Filter press) to separate spent bleach earth and bleached oil.
The oil will pass obtained after bleaching process is light in colour & appearance of oil will be clear golden in colour.
Winterization machine in vegetable oil refinery plant
2.3 Dewaxing and winterization (fractionation)
A very simple requirement of this process is to produce Clear, Brilliant refined oil and to meet certain specifications of Cloud Point.
Sunflower and Rice Bran oil normally contain waxes compared to other oil. Thereforethese oils are subjected to dewaxing process called winterisation plant, to remove waxes from oil and to produce sparkling good quality edible oils.
To remove the wax, the oil is first processed in Crystaliser where it is cooled by chilled water circulation. Where the wax is converted into crystal form and there after this will be pass through the filteration process. Now, the wax is separated and the dewaxed oil is collected
Henan Doing Mechancial Equipment Co., Ltd is one leading producer of oil equipment in China. We are specialized in edible oil making machine for 40 years. Our company have special engineers for palm oil processing machine and palm oil mill machine. They are reseaching and developing the technology.
2.4 Deodorizing section
This process removes odour from the oil to improve the quality and self-life of oil.
The bleached oil is charged to deodorizer directly or through heat exchanger and is heated at high temperature and also under high vacuum in deodorizer vessel to obtain odourless clear oil.
Once the process cycle is complete the oil obtained will be odourless & light in colour.
After cooling it will pass through polishing filter to obtained sparkling light colour & odourless oil for packing, which will be used as edible oil.
2.5 Dry fractionation
The separation of Stearin and Olien is continuously done on rotary vacuum drum filter and its principle is simple, whereas crystallization process involves a perfect technique to develop and grow the particles size for easy smooth separation of
Stearin and Olien.
Hydrogenation which is also called Fat Modification is unique 3 phase process system:Solid (Nickel Catalyst), Liquid (Oil) and Gas (Hydrogen). Further a selective reaction, by bringing gas—hydrogen, liquid—oil to the solid—Ni Catalyst and this technological concept formalised an Engineering Design.
Henan Doing Mechancial Equipment Co., Ltd is one leading producer of oil equipment in China. We are specialized in edible oil making machine for 40 years. Our company have special engineers for cooking oil processing machine and palm oil mill machine. They are reseaching and developing the technology.If you have any problems about the cooking oil machine,please feel free to contact us, and our engineer will give you a professional suggestion.