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Subcritical fluid extraction technology for Walnut oil The equipment can be used for projects of subcritical extraction such as oil refining project, plant protein powder, natural pigment, functional oils and fats, and Chinese medicine raw materials. The main solvent is butane - we call it No.4 solvent, boiling point -0.5℃, the extraction process is under a certain low pressure ( 0.3Mpa~1.0 Mpa status to liquid ) and room temperature, comparing with the oil extraction technology hexane - No.6 solvent, the technology by No.4 solvent has some benefites such as little toxic, low energy consumption and less residual. We can also provide the subcritical lab test eqiupment CBE 0.5L to 200L.