What is the leaching refining process?

The oil produced by leaching method is also called leaching oil, which is to leach oil with organic solvents (such as gasoline and ethanol). Leaching method is an oil-making process in which solvent oil (No.6 light gasoline) is used to soak the oil raw materials and leach at high temperature, so as to extract the oil. The first extracted "oil" is a mixture of organic solvent and grease, which is inedible. It can only be eaten after a series of refining processes (dewaxing, degumming, dehydration, deodorization, deacidification, decoloration, etc.). ). This kind of oil is generally light in color, and the original natural smell of the seed is light or no obvious smell. Leaching process can extract almost all oils from oils and fats, which has very high economic benefits and is the most popular processing method in modern oil industry.

According to the extraction principle, the oil extraction process is to use the mutual solubility of oil and solvent to extract and dissolve the oil by contacting the solvent with the oil in the treated solid oil. Compared with pressing method, leaching method has many advantages, such as less residual oil, high oil yield, good quality of meal, continuous production, low labor intensity, good production conditions and so on, and it is easy to realize large-scale automatic production. Leaching method has become the most commonly used method in large oil plants at present.

Characteristics of leaching method

Advantages: high oil yield, low cost and high economic benefit. The most popular processing method in modern petroleum industry.

Disadvantages: almost all nutrients are destroyed and a small amount of organic solvent remains.