The difference between oil and oil pressure leaching

A processing technique, 1, physical pressing process (rapeseed as an example) will be broken rapeseed water(water to prevent Chaojiao), and then fried, reentry expeller pressing, hair oil (semi refined oil), crude oilprecipitation, crude oil refining, most made of edible oil process of 2 chemical leaching (rapeseed oil, for example)to rapeseed pressed into flakes, six light gasoline soaked, make the oil dissolved in a light gasoline is mixed oil,then the mixed oil heating distillation to remove light gasoline, made of semi-finished oil and vegetable seed oilrefining chemical degumming, bleaching temperature, deodorization (refined; with 15 Baume alkali bleaching withbentonite clay, and the appropriate adding activated carbon) and finally made of edible oil. Oil extraction process from semi refined oil to the oil refining, the whole process of the use of chemical agents, and some even userefined sulfuric acid process.

Two, both pros and cons

1, nutrition pressing: do not destroy the linoleic acid and other unsaturated fatty acids, retained the originalnutrition oil crops (vitamins, minerals, trace elements and so on), also retains the original natural fragrant plant.Oil extraction: due to high temperature, chemical processing, destruction of linoleic acid and other unsaturatedfatty acids, nutrients (vitamins, minerals, trace elements and other damage, loss). Because the reading memberAlameda 7 membership privileges immediately Changxian main component extracted oil is the fatty acid, can provide energy for the body, basically no nutrition. Leaching oil usually colorless and tasteless, don't smell plantoriginal scent.

2, chemical residue pressed oil: basically no chemical residues. Oil extraction: chemicals using process No. 6 gasoline, have residues, these substances are beneficial to human body, or even poisonous.

3, the carcinogen benzo pyrene pressing: processing temperature, physical process, does not produce carcinogenic benzopyrene. Oil extraction: the high-temperature processing process generating benzopyrene(barbecue, fried, smoking will produce), is a strong carcinogen.

4, artificial antioxidants pressing: originally in vegetable oil with natural antioxidant, can be with or without addition of synthetic antioxidants. Leaching oil: high temperature processing destroyed antioxidative original material, and the lack of protection of antioxidants in edible oil can easily be oxidized and rancid, destroy the nutritional value,the harm to human body, and affect the taste. Therefore, the leaching of edible oil must be added to the synthetic antioxidant BHA (Ding Ji hydroxy anisole), BHT (two Ding Ji hydroxy toluene), TBHQ (uncle Ding Ji hydroquinone),these antioxidants are potentially toxic or carcinogenic effects, will bring the problem of food security, many countries have banned the use of. The following methods: leaching production using the leaching oil conceptleaching oil makes use of the principle of extraction, the choice of a can dissolve in organic solvent oil, make it --soak or spray contact with the pretreated oil, to a method for producing oil oil oil was dissolved. This method issolvent and it dissolved out of the lipid composition of a solution, this solution is called the mixed oil. Boiling point solvent and oil was selected by different, evaporation, stripping of mixed oil, solvent oil steam, leave, get the hairoil. Be steamed out of the solvent steam condensate recovery, recycling use.

Characteristics of two, leaching oil

(a) the advantages of leaching oil is a kind of advanced oil extraction methods in the world, to sum up,

It mainly has the following advantages:

1 residual oil pressure pressing oil preparation, as the pretreatment process could not make fuel cells were completely destroyed, protein denaturation may not be very thoroughly; pressing chamber temperature is not very high, the press bore pressure can not be great. Therefore, the press law will not be oil squeeze net residual oilcake, the rate is also higher. ZX 18 press press of various oil get cake, the residual oil rate of 5% - 8%. In contrast, the leaching oil leaching, either directly, or pre pressing extraction, can be under the control of the 1%residual oil leaching after meal.

The quality of 2 meal and oil pressing method is compared, in leaching oil production, because the relevantoperation temperature is low, the denaturation of protein in solid materials are less, the quality is good and somecorresponding meal. The meal or meal feeding value from the plant protein extraction are very favorable.

3, low production cost and squeezing method compared with oil, leaching oil processing production line iscomplete, high degree of mechanization, and easy to realize the automation of production. Secondly, the leachingplant operators, low labor intensity.

Furthermore, leaching oil process corresponding to lower energy consumption. Therefore, leaching oil, lower production cost.

There are 1 (two) damage may be caused by the solvent stage leaching method selection of solvent is mainlyhydrocarbon compounds. The leaching process of domestic light gasoline, using hexane as main component.This kind of solvents flammable and explosive, and the human nervous system has a strong stimulating effect. For example, when the vapor concentration in air light gasoline reached 1.20% - 7.50%, a fire will explode; when its concentration reached 30 40mg/l, direct contact with the human slightly is lethal. For these shortcomings of the solvent, as long as we strictly carry out the "safety regulations" oil production factory fire leaching, strictly abide by the rules, to maintain a high degree of vigilance, is generally not an accident.