Grease producing method and grease leacher

Abstract

The invention relates to a grease producing method and a grease leacher. The method takes a preprocessed oil material as the raw material, the oil content of the oil material is alpha, and the method comprises the steps of (1) leaching more than 80% of grease in the oil material in an soaking method in a first leaching unit in which the volume of soaking agent is 6-8 times as large as that of theoil material; (2) adopting a multi-stage gradient spraying method to leach the grease in a second leaching unit, controlling the concentration of output mixed oil to be alpha plus 2% to alpha plus 8%, and finally separating the mixed oil to obtain the grease. The grease leacher is in a cylinder shape and is divided into an upper layer and a lower layer, wherein the upper layer is provided with the first leaching unit, the lower layer is provided with the second leaching unit and an oil mixing hopper, and the leacher also comprises a driving mechanism which drives the first leaching unit and the second leaching unit to rotate horizontally. The materials in the first leaching unit can be unloaded into the second leaching unit when being rotated to a specific position. The grease produced according to the producing method and device of the invention has small energy consumption, low cost and low rate of residual oil in meal.

Description

technical field [0001] The invention relates to a method and a device for extracting oil from oil plants. Background technique [0002] At present, the production of edible oils and fats generally adopts the two-step extraction method of pre-pressing and leaching. Among them, there are mainly three types of oil leaching: [0003] 1. Intermittent leaching in an intermittent leaching tank: This method is mainly to soak the incoming oil with fresh solvent. After a period of leaching, a part of the oil is transferred into the solvent to form a mixed oil, and the leached material is used again. Solvent immersion, and repeat until almost all the oil is extracted. The disadvantage of this method is: for a long time, using fresh solvent for many times for leaching, the concentration of the obtained mixed oil is relatively thin, and the amount of mixed oil is too large. Industrial production is very unfavorable. [0004] 2. Soak the oil in a countercurrent solvent for extraction. I...

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Problems solved by technology

[0003] 1. Intermittent leaching in an intermittent leaching tank: This method is mainly to soak the incoming oil with fresh solvent. After a period of leaching, a part of the oil is transferred into the solvent to form a mixed oil, and the leached material is used again. Solvent immersion, and repeat until almost all the oil is extracted. The disadvantage of this method is: for a long time, using fresh solvent for many times for leaching, the concentration of the obtained mixed oil is relatively thin, and the amount of mixed oil is too large. Industrial production is very unfavorable

[0004] 2. Soak the oil in a countercurrent solvent for extraction. In this method, the extraction of oil is carried out steplessly under absolute countercurrent conditions. There is a long leaching route, and the concentration of the mixed oil obtained at last is low (15% ~20%), the structure of the oil is destroyed when the material moves (thereby making the mixed oil turbid, the mixed oil contains more meal powder, which increases the difficulty of filtration, and the height of the extractor is larger), And when the density of the oil is lower than the density of the thick mixed oil, the meal powder leached from the oil is easy to float and be taken away with the mixed oil

[0005] 3. Multi-stage countercurrent spraying for leaching and extraction: This method uses the most widely used horizontal leaching device at present, and the oil is leached in a relatively countercurrent condition. Here, only the solvent flows, and the oil is placed in the leaching cell. The method has very high requirements on the permeability of the raw material. For oil materials with large powder degree and poor permeability, such as rice bran and pre-pressed cake with a lot of powder, the effect of spraying and leaching is poor, because the solvent is easy to form a short circuit when it penetrates in the oil material, thus As a result, a part of the oil has not been leached by the solvent or has not been fully leached, and the oil content in this part of the oil is relatively high, resulting in a high residual oil rate in all the oil.

Moreover, in the horizontal rotary extractor, the material is compacted after the oil is loaded into the extractor, which reduces the penetration ability of the solvent or mixed oil to a certain extent, and also reduces the leaching effect.

The leaching effect is easily affected by the oil pretreatment and oil structure, the leaching effect is generally not good, and the residual oil rate of the meal is high

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