1. Processing process

1. Physical pressing process (take rapeseed as an example)

Crush rapeseed with water (the purpose of adding water is to prevent scorching) → then stir -fry → then put into the spiral oil press →Oil oil (semi -finished oil) → precipitate the coat oil → refine the hair oil → After the 蕞 蕞

2. The chemical leaching oil process (take rapeseed as an example)

First press the rapeseed into a broken thin piece →Soak with light gasoline No. 6 to dissolve the oil to form a mixed oil in light gasoline → then remove the light gasoline for heating and distillation of the hybrid oil to make semi -pong -made oil → rapeseed coat chemical high -temperature refinement, decolorizing, deodorizingMido's alkaline fluid refine; use pussy white soil for discoloration, and add activated carbon properly) → After the 蕞, make edible oil.From semi -refined oil to hair oil refining, the whole process is using chemical agents.

2. The advantages and disadvantages of the two

1. Nutrition

Pressor: Do not destroy unsaturated fatty acids such as linoleic acid, and retain the original nutrients (vitamins, minerals, trace elements, etc.) of oil crops, alsoThe original natural fragrance of the plant is retained.Immersion oil: Due to the processing of high temperature and chemistry, unsaturated fatty acids such as linoleic acid are destroyed, nutrients (vitamins, minerals, trace elements, etc.) are damaged and lost.The main component of the 7 major members of the 7 major members of the 7th major members of the reading member is a variety of fatty acids, which can only provide energy for the human body. Basically, there is no nutritional at all.Oils are usually colorless and tasteless, and they cannot smell the original fragrance of the plant.

2. Chemical residues

Press oil: Basically no chemical residues.

Soaking oil: Various chemicals used during processing of No. 6 gasoline are residial, and these substances are not beneficial to the human body or even toxic.

3, carcinogen benzene pyrine

: low temperature, physical processing process, no carcinogen benzene is not produced.

Soaked oil: The high temperature processing process produces benzene (barbecue, fried, smoking will produce), which is a strong carcinogen.

4. Artificial antioxidant

Pressor: There are natural antioxidant substances in vegetable oils, which can not be added or adding artificially synthetic antioxidants.

Immerse oil: During the high temperature processing process, the original antioxidant substance was destroyed, and the protection oil that lacked antioxidant substances was very easy to be oxidized and produced. It destroyed nutritional value, produced harmful ingredients to the human body, and affected the taste.Therefore, immersion edible oils must be added with artificially synthetic antioxidants BHA (butyl hydroxyl fennel ether),

BHT (di butanopenene), TBHQ (ol -orbenphenylphenol), etc. These antioxidants have potential toxicityEven carcinogenic effects will bring food safety problems, and many countries have prohibited use.

The method of production of immersion method is as follows:

immersion the concept of legal oil -made oil is the principle of applying the extraction. Choose some organic solvents that can dissolve oil to make it contact with pre -processed oil -soaking or sprayingDripping, a method of oil -making method dissolved in the oil in the oil.This method consists of a solution with the oil it dissolved, which is called a hybrid oil.Use the selected solvent to the boiling point of the oil, evaporate, steam the mixed oil, steam the solvent, leave oil, and get hair oil.The steamed solvent steam is recycled by condensation and recycled. 2. The characteristics of immersion legal oil (1) Advantages Emailing legal oil is a well -recognized method of squeeze oil squeeze. It is summarized.During the legal oil, because the pre -processing sequence cannot completely damage the oil cells, and the protein degeneration cannot be very thorough; the temperature of the squeezing can not be very high, and the pressure of the squeezing bore is not very large.Therefore, it is impossible to squeeze the oil to squeeze the oil, and the residual oil rate of the squeezing cake is still higher.For example, the squeezing cake obtained by the ZX · 18 oil press squeezed a variety of oils, and its residual oil rate was 5%-8%.In contrast, the use of immersion legal oil, whether it is directly immersed or pre -squeezed, can control the residual oil rate of the post -immersed meal below 1%. 2. The quality of the meal is good compared with the squeezing legal oil. In the production of legal oil production, the operating temperature of the relevant process is relatively low, so that the degree of degeneration of protein in solid materials is small, and the quality of the meal is correspondingly good.Some.This is very beneficial to the feed value of meal or extract plant protein from the meal. 3. Compared with the low production cost and pressing legal oil, the production lines used by the immersion legal oil process are generally relatively complete, the degree of mechanization is high, and it is easy to achieve automation.Secondly, there are fewer operators and low labor intensity.Furthermore, the energy consumption of leaching the legal oil process should be lower.Therefore, the production cost of immersion legal oil is relatively low. (2) There are problems 1. The harm that can be caused by the solvent may be caused by the solvents selected at this stage.The light gasoline used in the current leaching process in China is based on hexane.Such solvents are flammable and explosive, and have a strong stimulus effect on human nervous system.For example, when the steam concentration of light gasoline in the air reaches 1.20% - 7.50%, it will explode as soon as it encounters fire; when its concentration reaches 30-40mg/L, it will be killed when it is directly in contact with people.For these disadvantages of solvents, as long as we strictly implement the \"Fire Safety Standards for Soaking Oil Make\", strictly abide by the operating procedures, and maintain high vigilance, generally there will be no accidents. 2. The quality of the soaked hair oil is slightly worse The ability to dissolve the organic solvents is very strong. It can not only dissolve the oil, but also dissolve some pigments and lipid -like in the oil., Increase impurities.In this way, the quality of the soaked hair oil is worse than pressing hair oil, and the refinement is lower, and the work burden on the refined process will be increased accordingly. 3. Investment needs to be increased Due to the flammable and explosive solvents used in the production process, and harmful to the human body, the fire risk category of the building fire in the production workshop should be Class A, and the low refractory level should reach the second level.The workshop equipment should be processed on the ground. The electrical appliances need to be explosion -proof type, and the workshop should be set up for lightning off the workshop.In addition, the equipment and pipelines of the workshop need to be strictly sealed, and so on.In this way, the construction of the entire leaching workshop will increase the total investment.