Under normal temperature and pressure (0.3 MPa to 0.8 MPa), uses butane as the solvent to extract active components from marigold granule through counter current extraction, and then the vacuum evaporation of solvent extract and meal will start, the solvent gas after evaporation will go through compression and condensation for recycling use. A part of the heat for solvent evaporation comes from the system itself. Another part of the heat is supplied by the heating system.
Extraction process
First, the marigold flower granule are transported to the storage tank, and then the conveyor enters the extraction tank. A counter-current extraction process is formed in the extraction tank between the marigold flower granules and solvent. The newly entered marigold flowers is soaked in a high concentration of extracts, then the concentration of the extracted liquid is reduced in turn, and uses the fresh solvent in the last counter current extraction process. The extraction frequency was 4 ~ 6 times. Extraction time of 120-180 minutes, extraction temperature is 45 ℃, the lutein residual within the meal is less than below 0.5%, extract concentration is 20 ~ 25%. (Read more about grape seed oil extraction process.
Wet meal desolventizing process
When the wet meal is in extractor, uses indirect steam to steam solvent. First, uses compressor to remove solvent by decompression desolventizing, then uses vacuum negative pressure to remove solvent when the temperature arrived at certain pressure, finally, the solvent is steamed out of the meal. After desolventizing treatment, residual solvent within the meal is about 700 parts per million, the moisture content in the meal is less than 12%, the temperature of meal desolventizing is 40 ℃around. Then, the meal can be conveyed to the meal storehouse for measurement, package and storage.
Extract treatment process
The extract from the extraction tank goes through extract filter and extract tank to remove pulp foam, and then the solvent is removed from it through decompression. The residual solvent of extract removed solvent s less than 500 parts per million, and the temperature is 55 ℃. The extraction liquid concentration system is operated under negative pressure to ensure that the solvent is dissolvent at lower temperature.
The solvent coming from extraction tank, evaporator is condensed by their own compressor. After being compressed and liquefied, the solvent comes to condenser. Condensed solvent is recycled into the recycle tank, and the non-condensable solvent gas is discharged periodically through the fixed channel.
Article Source:http://www.bestextractionmachine.com/biological-pigment-extraction/lutein-extraction-plant-from-marigold-flower.html
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