Decolorization and dehydration section of peanut oil refining equipment
Decolorization and dehydration section
[Company Brand] : Henan Zhongxing
[Production capacity] : 50-100t /D
[Application] : Edible oil processing
[Applicable materials] : Peanut, soybean, cottonseed, sunflower seed, rice bran, corn germ, rapeseed, etc
Decolorization, dewatering part: Decolorization pot also known as pot dewatering heating under vacuum in the pot decolorization to remove water in the oil.It is sucked into the clay decolorization pot through a vacuum and then stirred under the influence of a vibrating filter to filter out the clay in order to achieve a change in the color of the oil.
The main function of the decolorization step is to remove traces of oil pigments, remaining soap particles and metal ions.The bleaching effect is more obvious in the combination of negative pressure steam stirring under mechanical agitation.
The degummed oil enters the heater to the appropriate temperature (110 ° C) and is mixed into the clay tank.From airlift to staging clay POTS in low clay boxes, clay addition is automatically measured, controlled and implemented with interlocking oil feed.
The oil mixes with clay and overflows into a continuous decolorizer.Decolorization is stirred by unpowered steam.The bleached leaves can be used interchangeably after infiltration into the two filters.After the oil filter, it passes through the filter into the bleached oil, which is fitted with a nozzle box designed with a vacuum tank to avoid contact with the value of the air bleached peroxide oil and affect its reversal.
The decolorization earth platform for filtering gutter oil has the advantages of more effective vertical blade filtration, convenient operation, continuous operation, low labor intensity, good environmental conditions and less waste white soil residual oil.
First of all, sorbent species:
1. The bleaching earth
Bentonite is a kind of adsorbent.They are mostly white or gray.Decolorization coefficient bleaching soil is low, less chlorophyll decolorization ability, oil absorption is better.
2. Active clay
Based on bentonite as raw material, the treatment of artificial chemical adsorbents with high activity in a wide range of industrial applications was carried out.Used for pigment and colloid material adsorption capacity, especially for some basic groups or polar groups has a stronger adsorption capacity.
3. Activated Carbon
Made from wood chips, bagasse, rice hulls, husks and other hard substances through chemical or physical treatment from activation.Featuring a loose, large specific surface area, bleaching factor, and hydrophobic pores that can adsorb polymer materials, blue and green pigment removal is particularly effective for gas, pesticide residues, and also has a strong adsorption capacity.But it is expensive, high oil absorption, and is usually mixed with bleached or active clay.
4. Attapulgite
It is a fibrous magnesium-rich soil composed mainly of silica.Simple and delicate, with good color removal, low oil absorption rate, good filtration performance.
Secondly, the influence of absorption factors
1. Adsorbent
Different adsorbents have different characteristics and should be selected according to the actual needs of the adsorbents.Oil decolorization is a general choice for more high activity, low oil absorption and clay filtration speed.
2. Work pressure
And adsorption decolorization adsorption process, often accompanied by thermal oxidation side reaction, the beneficial side effect of the bleaching of this oil is: some dyes fade due to oxidation, negative side: leave the pigment due to oxidation or fixed to produce new pigments and affect the stability of the finished product.Negative decolorization due to low operating pressure, thermal oxidation of the by-reaction is weak, general vacuum bleaching, vacuum degree 0.096 MPa.
3. Operating temperature
Adsorption operation temperature depends on oil type, operating pressure and species and other characteristics of the adsorbent.Red ratio removal yellow high temperature removal;Decolorization and active low pressure adsorbents require higher operating temperatures;Adsorbent decompression operation and suitable for high activity bleaching at low temperatures.The usual bleaching temperature is about 105ºC.
4. Operation time
Decolorized oil operation and adsorption contact time high temperature is determined by the adsorption balance between the adsorbent and pigment, as long as the stirring effect, adsorption balance does not need a very long time, in the continuation of time, or even make color reduction.Usually the bleaching temperature is controlled for 20-30 minutes on the industry.
5, stirring
In the decolorization process, the adsorbed pigment is on the surface of the adsorbent, which belongs to the isomeric physical and chemical reaction.The lipids have a good agitation under which to make a even contact with the adsorbent.The mixing is used directly in the production of steam.
6. Crude oil quality and pretreatment.
Crude oil, pigment removal is easier, while oil, grease or in processing or storage due to oxidation of new dyes and fixed new pigments, generally more difficult to remove.Decolorization treatment is also very important, when the bleached oil and suspended solids and residual gum or oil-soluble soap some of the impurities will occupy a part of the active surface, thereby reducing the efficiency of decolorization.Generally, the quality of decolorization pretreatment oil should meet the following conditions: P≤10ppm, residual soap ≤100PPM.
Three, decolorization loss
The main damage caused by waste clay adsorption decolorization adsorption, waste clay oil content should be reduced as far as possible.
Decolorization loss = waste clay × dry clay oil content
Fourth, the continuous decolorization process has the following characteristics:
1, the oil and in contact with the full motion, high decolorization efficiency bleach, reduce the amount of bleach;
2, the material uniform and continuous offset, so that the adsorption time, to avoid oxidation and oil acid recovery;
3, the bleaching tower special structure, in order to make the material does not stir, in order to avoid dead corners and tube blockage precipitate adsorbent;
4, Continuous closed filter device realizes the automation of cake unloading and reduces the labor intensity;
5, Advanced drying technology to reduce the oil content in the filter cake.
Five, decolorization process parameters
Main economic and technical indicators
