Sunflower oil processing process usually uses two processes: pressing and extraction. Pressing is a traditional physical processing process that squeezes out oil through external force to retain the nutrition and flavor of oil. The oil is green and healthy and is loved by consumers. The sunflower oil extraction process uses solvent extraction to extract oil, which is a chemical process. During sunflower oil extraction process, the sunflower oil in the oil seed can be fully extracted and the residual oil in the cake can be controlled within an extremely low range. It is one of the most widely used edible oil processing processes.

The sunflower oil extraction process project mainly covers the steps of pretreatment, extraction, wet meal desolventization, mixed oil evaporation and stripping, and solvent recovery of sunflower cake. The following is a detailed process description:

1) Pretreatment: Crush and screen the sunflower cake to remove impurities and adjust its particle size to adapt to the subsequent sunflower oil extraction process. If necessary, dry the sunflower cake to control the moisture content of the sunflower cake to improve the extraction efficiency.

2) Extraction: Use a specific organic solvent (such as hexane) to extract the oil from the sunflower cake. This is usually done in a closed extractor to ensure efficient use of the solvent and reduce volatility. The solvent is fully contacted with the sunflower seed cake by stirring or circulating flow, dissolving the oil from the cake to form a mixed oil.

3) Wet meal desolventization: The wet meal (sunflower seed cake containing solvent) after extraction is desolventized and heated by steam or hot air to evaporate the solvent from the wet meal. The desolventized meal can be used as feed or for other industrial purposes.

4) Mixed oil evaporation stripping: The mixed oil containing solvent is sent to the evaporator and the solvent is evaporated by heating. Subsequently, the residual solvent is further removed in the stripping tower to obtain crude oil that is almost free of solvent.

5) Solvent recovery: The solvent vapor generated from the wet meal desolventization and mixed oil evaporation stripping process is condensed into liquid solvent. The recovered solvent is purified and can be recycled in the sunflower oil extraction process to reduce production costs and environmental pollution.

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