Use of isopropyl acetate as leaching solvent in leaching vegetable oil and method for leaching oil using it

Abstract

The invention discloses use of isopropyl acetate as a leaching solvent in plant oil and fat leaching and an oil and fat leaching method using the isopropyl acetate. The method is as follows: 1) crushing a plant oil and fat raw material to obtain a crushed matter or pre treating the plant oil and fat raw material to obtain a blank sheet or pre pressing the plant oil and fat raw material to obtain a pressed cake; 2) using the isopropyl acetate to leach the crushed matter or the pressed cake obtained by the step 1), then performing solid-liquid separation to obtain mixed oil and wet meal; 3) separating the mixed oil leached by the step 2) to obtain plant oil and fat. The method uses the isopropyl acetate which can be used as an edible spice as a solvent, the leached oil and fat is free of sulfur and benzene, the high concentration and high quality oil and fat is obtained, and the process can improve the leaching efficiency and reduce energy consumption.

Description

Technical field [0001] The invention belongs to the technical field of vegetable oil extraction, and specifically relates to the use of isopropyl acetate as a leaching solvent for leaching vegetable oils and a method for extracting oils using the same. Background technique [0002] In the production process of vegetable fats and oils, the leaching method is a more advanced oil-making method. It applies the principle of solid-liquid extraction, selects an organic solvent that can dissolve the fat, and contacts the oil (soaking or spraying) , A method of extracting the fat in the oil, mostly using pre-pressed cake and then leaching. The leaching method has the advantages of high oil yield, low residual oil rate in meal, low labor intensity, high production efficiency, low protein denaturation in meal, good quality, and easy realization of large-scale production and production automation. [0003] In my country, the use of direct leaching or pre-pressing leaching process of vegetable...

AI Technical Summary

Problems solved by technology

However, the vegetable oil extraction solvent has the following defects: 1) The flash point of the vegetable oil extraction solvent is low (the flash point of n-hexane is below -23°C, the flash point of cyclohexane is -17°C, and the flash point of other C6 alkanes is -6 below ℃), it is more dangerous during storage and use

2) Vegetable oil extraction solvents are highly volatile and highly fat-soluble. In particular, n-hexane can accumulate in the human body and is highly toxic to the nervous system. Due to lack of protection, insufficient attention or lack of understanding of its toxicity, n-hexane has appeared in many places Poisoning tragedies (such as the poisoning of Apple supplier workers)

In particular, aromatic solvents such as benzene remain in the vegetable oil extraction solvent, which is more toxic

3) Vegetable oil extraction solvent contains corrosive impurities such as sulfur, which is highly corrosive to the system

4) The composition of the vegetable oil extraction solvent is unstable, and each factory and batch has a great influence, which makes the extraction process change greatly

Although supercritical fluid extraction of vegetable oil has obvious advantages, it is difficult to apply it on a large scale because of its high requirements for equipment.

Ethanol, oilseed meal has a strong adsorption effect on ethanol, the loss of ethanol solvent is relatively large, the industrialization cost is too high, and the leaching of water-containing ethanol will make the leached oil contain more sugars, proteins and other colloids, which will cause harm to the process operation

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