Oil solvent extraction technology is to use n-hexane or other organic solvents to extract oil from the oilseed flakes, expanded materials or oil cake. And using a series of evaporating and stripping method to remove and recover the solvent in the miscella and wet meal to get crude oil. This technology can get more oil from oilseeds effectively.
Oil solvent extraction technology is very safe and scientific. For high oil yield oilseeds, we use pre-press and solvent extraction technology, like sunflower seed; For low oil yield oilseeds, we use direct solvent extraction technology, like rice bran. There are three kinds of extractors: rotocel extractor, loop extractor and towline extractor.
2. Oil Solvent Extraction Process:
Oil solvent extraction mainly includes extractor, desolventizer, evaporator, stripping tower, condenser,exhaust gas recovery machine.
Oilseed flakes or cake are conveyed into extractor, for solvent spraying, steeping and extracting. Then miscella will be pumped to evaporation system and stripping tower to get crude oil from miscella and wet meal will be desolventized at DTDC.
Miscella will be pumped to evaporation system after removing impurities twice. The evaporation system consists of first evaporator, second evaporator and stripping tower. The solvent evaporated from miscella will be recycled.
Wet meal from extractor contains a certain amount of solvent will be conveyed to D.T.D.C for desolventizing, toasting, drying and cooling.
The solvent vapor evaporated from each section is recycled to solvent tank through the condenser. The uncondensed solvent vapor enters into the tail gas condenser and most of uncondensed solvent vapor will be condensed. A small amount of solvent vapor enters into the paraffin oil recycling system in which solvent vapor is recollected by paraffin oil. Other incondensable gas is exhausted through the exhaust fan.
3. Advantages of solvent extraction:
Negative extraction, high oil yield, low residual oil rate in meal, good quality meal
Big volume extractor design, high process capacity, high benefit and low cost.
The solvent extracting system can be designed according to different oilseeds and capacity, which is easy and reliable.
Special solvent vapor recycling system, keep clean production environment and high efficiency.
Sufficient energy saving design, energy reusing and low energy consumption.
Processing capacity: 20-5000T/D
Solvent extraction technology is applied in all kinds of oilseeds, such as soybean, peanut, sunflower, cottonseed, rapeseed, canola, linseed, castor, copra, rice bran, corn germm, mustard seed and so on.