Solvent extraction plant process

• May 20, 2020 14:10
• Oil solvent extraction process
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Cooking oil machine in solvent extraction plant workshop

Solvent extraction plant process：
Preparatory Section
Extraction unit
Distillation unit
Meal Toasting
Recuperation unit
Meal Finishing Section
DTDC for large capacity plant

Workshop of solvent extraction plant

Exaporation process
The pre-pressed cake or flake, firstly enter into the sealed scraper blade to avoid the solvent gas escaping because of the section without screw blade in the sealed auger. Sunflower seeds enter into the box-chained loop type extractor counter-currenting with the solvent, the grease is extracted. Miscella condensity increase from 2% to more than 25%. Miscella discharged from extractor and into miscella filter, then the leached meal in the miscella tank enter into evaporation system through 1st evaporation feed pump and finally drop-in DTDC out from wet meal drag conveyor.

Evaporation process
Using the secondary steam desolventized from solvent extraction plant process and produced by steam-jet pump to heat and evaporate micella in the first long-tube evaporator. Export temperature reaches to 58-62℃ and condensity reaches to more than 65%. Then, micella enters into the second long-tube evaporator in which the temperature is heated to 105-110℃ by indirect steam and the condensity reaches to more than 95%. Then miscella enters into stripper in which residual solvent in oil will be removed, the export temperature reaches to about 105℃ and the general volatile of the extracted crude oil in solvent extraction plant process is less than 0.30%.

Desolventizing process:                                                    
Wet meals discharged from the bottom of extractor enter the top of DTDC and land on the predesolventizing trayers where thery are heated by the indirect steam, thus, some solvent in meal is evaporated and meal temperature is risen; Predesolventized meals land on predesolventizing trayers where they use the second steam in desolventizing trayers to predesolventize solvent from meal, then, meals enter desolventizing layers in which direct steam is injected.Direct steam is sprayed into the meals through the bottom holes, and distill the solvent from meal by using steam in order to remove all solvent; Desolventizing process is the main process in solvent extraction plant process.Desolventized meals land on the following drying and cooling layer to dry and cool meals,cooled meals land on meal scraper blade from automatic material controlling gate on the bottom of cooling layer, and then they are entered into meal storehouse.

Condensation recovery process：
Extractor is equiped with a seperate condenser, Condensation recovery process is the final process in solvent extraction plant process,1st and 2nd evaporation share one condenser. Low and high temperature of solvent gas both from 1st and 2nd evaporation enter into the condenser after its neutralization, which greatly reduces the load of condenser and improves the efficiency of condensing. Stripping and analyzing share one condenser, the non-condensable gases from extractor and other condensers enter into the vent gas recovery system through the final condenser.
In the recycling system, the cold paraffin will absorb the solvent gas and the final nonsolvent gas will be discharged through fire resistance valve.Paraffin absorbed the solvent gas can be also called rich oil, after heating by oil-oil heat exchanger and steam, the rich oil will enter into desorber for desorption, and into condenser after changing solvent into gas, the final cooled paraffin can be recycled.