Traditional cooking oil refining process, usually including degumming, deacidification, dissolution, decolorization, dewaxing, deodorization, decolorization process etc.
How to get a clear and transparent palm oil?
Traditional cooking oil refining process, usually including degumming, deacidification, dissolution, decolorization, dewaxing, deodorization, decolorization process is an essential link of oil refining, decolorization is not all pigment, but to improve oil color, improve oil quality, into-step refining to provide qualified raw material oil.
Palm oil is rich in carotene (0.05% -0.2%) and is dark orange. This pigment cannot be effectively removed by alkalization, and can remove the oil to generally light yellow by oxidation. Palm oil is also gradually decolormented by sunlight and air.
So crude palm oil is color deep, poor clarity, through decolorization processing, after refining to get close to colorless transparent, in solid state nearly white texture, at the same time, decolorization can also reduce the phospholipid content, peroxide value, soap content and metal ion content, to improve oil color and flavor and improve oxidation stability, for oil further refined hydrogenation, deodorization provides a good condition.
New decolor refining process
At present, the most common method of oil decolorization in modern process is the active clay adsorption decolorization method, that is, the use of clay with strong selective adsorption effect, under certain conditions to remove the pigment dissolved in oil or the pigment dispersed by colloidal particles and other impurities.
Due to the traditional edible oil refining process, oil decolorization process is usually set in the middle section of the refining process, because the oil palm fruit contains more lipase, difficult to process in the process of processing or remove completely, in the process of palm wool oil in the process, lipase easily hydrolysis and generate more free fatty acids, resulting in processed palm oleic acid value increased, affect the improvement of the quality of palm oil products.
Therefore, the optimized decolorization treatment method of palm oil has subsequently emerged, the method is to desolvate the oil material to be decolorized and then dried, after drying, add decolorization agent for predecolorization treatment, and use clay filter cake for decolorization and pressure filtration;
Then conduct the pre-deodorization treatment, use the filler-type deodorization tower as a container, and add L-ascorbic acid permitate, flavonoids and phosphoic acid to the pressurized filtration treatment of the oil for vacuum deodorization treatment;
After the vacuum deodorization treatment, the oil is quickly cooled to 3~5 C for impurity treatment. After the impurity removal, the oil is mixed in the premixed tank and mixed evenly and put into the decolorization tower for three-stage refined treatment, so as to get the palm oil.
Effectively improve the decolorization quality of palm oil, and reduce the despidase retained by palm oil in the decolorization process, and reduce the amount of free fatty acids produced in the subsequent process.
Specific operation steps:
S1 Dry the decolorized oil, send it to the decolorization tank after drying, add ring-dextrin and aluminum magnesium silicate as the decolorization agent, heat it to 60~65 ” C, process it for 3~5min, and then use the white earth filter cake for decolorization and pressure filtration;
S2 Pre-deodorization treatment is carried out on the oil treated in step S1. In the pre-deodorization treatment, a packed deodorization tower is used as the container, and L-ascorbyl palmitate 1.2~1.8% of the total weight of the oil, flavonoids 0.08~0.12% of the total weight of the oil and phosphoric acid 70~80% of the total weight of the oil are added to the oil treated in step S1. The temperature of deodorization treatment was 210-230°C and the vacuum level was 0.07-0.08 MPa for vacuum deodorization;
S3 The oil treated in step S2 is quickly cooled to 3~5°C for decontamination, and the decontaminated oil is mixed with white clay in the pre-mixing tank, stirred and mixed well – and put into the decolorization tower for fine decolorization, and three stages of fine decolorization are used for fine decolorization:
First heat up to 80~90 C, normal pressure decolor 10~ 15min;
Then pump into the oversaturated steam, and heat up to 105~110 C, decoloring treatment for 5~8min;
Finally, vacuum the decolization tower to the vessel pressure of 0.05~0.06MPa and perform vacuum decolor for 10~15min; the palm oil is finished.
1.Decolorized oil to be used as raw material is palm oil obtained by cold temperature and cold pressing as raw material and made after degluming, deacidification and desoluization treatment. 2.In step S1, the mass ratio of cyclodextrin to aluminum magnesium silicate in the decoloring agent is 3:5 to 6:7, and the addition amount is 4 to 5% of the mass of the oil to be decolorized.
3.In step S1, when decolorization is performed in the tank, stirring is performed at 60-70 r / min. 4.In step S3,10-30 μ m wound filter is used under pressure under 0.13~0.15MPa.
5.In step S3, the control amount of clay when mixed in the premixing tank is 0.3~0.5% of the total oil weight.