Dry hydration of vegetable oil

 
The process is designed to increase the grade of vegetable oils with minimal energy costs and without separating hydration into a separate technological line.
 
This useful model relates to the hydration and winterization methods for vegetable oils and can be used in the oil and fat industry or in other food industries that involve the usage of vegetable oils.
 
The existing hydration and winterization approaches are associated with higher energy costs and the use of several types of equipment comparing to the dry hydration approach.
 
The standard hydration of vegetable oils is based on the processes of separation of phospholipids, dissolved in crude oils, by adding the water to the oil at a temperature of 45 - 50°C, followed by subsequent coagulation of phospholipids, sedimentation, centrifugation, filtration and drying of the resulting oil.
 
Winterization of vegetable oils involves the separation of wax-like substances contained in oils at a temperature of 10 - 12°C, with the subsequent filtration.
 
The dry hydration approach allows combining two technological processes into one process, provided that a Reagent-Coagulant 1 is used.
This process is a part of the overall vegetable oil extraction technology and is introduced as a separate link in the process chain before the filtering stage.
 
Unlike the standard hydration process, dry hydration does not require the removal of hydrofuse with its further disposal, because with the use of a Reagent-Coagulant 1 all the supplied liquid is absorbed by phosphatides, that can easily be filtered by any type of filter.
 

The process requires:

 
1.Equipment:
 
- Coagulator;
- Container for the dosed supply of water and reagent-coagulant.
 
2.Reagent-Coagulant 1 (RC1):
 
- Water: 0-1% of the total amount of oil;
- Water: 0-1% of the total amount of oil;
 

Description of the dry hydration process

 
After pressing or extraction, a vegetable oil enters the general container of unfiltered oil, where the part of the oil is used for the formation of a wash layer on the filter, while the other part goes to the coagulator. Then the oil is mixed with reagent-coagulant, coming from the dosing tank in quantity, determined by the quality indicators of the original oil. The oil should be being mixed with reagent-coagulant during 30-40 minutes. As a result of dry hydration, all remaining moisture is absorbed by phosphatides, which precipitate in the form of flakes. Next, the oil is fed to the pre-washed filter to start a filtering process.
 

Advantages of dry hydration

 
1. The dry hydration process is built into the technological process of oil production without changing the technological chain.
 
2. No hydrofuse is formed after carrying out the process, so no additional expenses required for its further processing or utilization.
 
3. No loss of raw materials during the process, since the filtered phosphatides return in the technological process and the entrainment of oil with hydrofuse does not occur.
 
4. Possibility to reach the content of phosphatides in the final product of 0.2 - 0.6%.
 
5. The process allows combining the hydration and winterization processes in one dry hydration process, withstanding temperature conditions in the range of 14 - 17°C.
 
6. Dry hydration does not depend on the temperature of the processed oil.
 
7. As a result of using a minimum amount of water, the oil does not lose its oxidation stability, therefore its term of preservation does not decrease, unlike after the standard hydration process.
 
8. The residual moisture of the resulting oil is minimal - not more than 0.1%.
 
9. Minimal energy consumption.
 
10. No need for additional equipment related to heating or cooling the oil, drying it and separating hydrofuse with its further processing, which means that the amount of equipment necessary for carrying out the dry hydration process is minimized.