食用油抽出設備メーカー
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Solvent extraction in vegetable oil production
Solvent extraction is used in large-scale vegetable oil production to achieve higher oil recovery than mechanical pressing alone. The process uses food-grade hexane (a petroleum-derived solvent) to extract residual oil from pre-pressed cake or directly from conditioned and flaked oilseeds. In a pre-press plus solvent extraction system: conditioned, flaked oilseeds are first pressed in a screw expeller to extract the bulk of the oil (leaving approximately 12–18% oil in the press cake); the press cake (expeller cake) is then fed to the solvent extractor where hexane is used to wash out the remaining oil, reducing residual oil in the spent meal to typically 1% or below. The miscella (hexane + oil mixture) is separated from the extracted meal by distillation, recovering both the solvent (recycled) and the crude oil. The extracted meal is treated in a desolventiser-toaster to remove residual hexane and to toast the meal (important for soybean meal quality). The use of hexane requires ATEX-rated equipment, appropriate containment and ventilation, and fire and explosion prevention systems throughout the extraction facility.
Frequently asked questions
What is the minimum viable scale for a solvent extraction plant?
Solvent extraction plants require significant capital investment in extraction equipment, solvent storage and recovery systems, ATEX-compliant electrical systems, and fire protection. The minimum economically practical scale for a continuous solvent extraction plant is generally 200–300 tonnes of oilseed per day — below this scale, the capital and operating costs per tonne of oil recovered are typically higher than the value of the marginal oil recovery over mechanical pressing. For smaller-scale operations, mechanical pressing with pre-press followed by expeller finishing (reducing residual oil to 5–8%) is a more practical choice. The decision should be based on a full economic analysis of the marginal oil recovery, capital cost, and operating cost at the intended scale.