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Negative pressure evaporation process in the vegetable oil extraction machine The miscella from the vegetable oil extraction machine is contained fat and oil, the miscella can be separated according their different vaporization temperatures. Zhengzhou Dayang Oil Chemical Equipment Co., Ltd mainly use vacuum evaporation technology, and it can reduce solvent leakage and consumption. The separated solvent vapour will be cooled and reused back to the vegetable oil extraction machine, it will improve the solvent efficiency and reduce consumption.