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Subcritical low temperature leaching extraction refers to countercurrent extraction of oil with liquid propane and butane solvents.Since the extraction temperature is above the boiling point temperature of the solvent and below the critical temperature,it is defined as subcritical low temperature leaching(extraction).The extraction principle is similar phase solution principle,the extraction process is countercurrent extraction,the extraction pressure is between 0.3MPa and 1.0MPa,the extraction and desolution temperature is the ambient temperature.The extraction solvent is compressed and recycled.
The sub-critical extraction equipment(liquefied butane)has lower processing temperature than conventional pressing equipment and does not destroy the heat sensitive substances.
Technical advantages:
(1)The leaching,extraction and desolution of the materials are completed at room temperature,and the heat sensitive components in the oil and meal are basically not thermal denaturation,and the extraction and separation of protein,pigment,medicinal materials and volatile essential oils are realized.
?、赥he solvent consumption is small,the solvent consumption is less than 8Kg for each processing 1 ton of raw materials;
(3)the loss of water is only in the consumption of circulating cooling water;
?、躎he production cost is about 300 yuan/ton material.The production scale can realize the daily processing of raw materials 5 tons-200 tons.