The processing of vegetable oil in industrial purposes is frequently completed by chemical extraction, employing solvent extracts, which produces increased yields and is quicker and significantly less pricey. The most common solvent is petroleum-derived hexane. This technique is utilised for most of the “newer” industrial oils these kinds of as soybean and corn oils
Solvent Extraction Circulation Chart
A Continuous extraction
Substance enters the buffer bin on the extractor to begin with,the buffer bin is equipped with automatic materials degree management program, use variable frequency feeding screw conveyor to feed components into extractor quantitatively .The materials run a circle from feed inlet to outlet in extractor, and spray with miscella with descending concentration among inlet and outlet, before moving into drain part, spray with new solvent again, at very last the soaked meal discharges from the base of extractor, enters soaked meal scraper. Concentrated miscella is pumped to cyclone hydraulic separator by pump to eliminate meal powder, then enter the miscella tank to further remove the impurities.
B .DTC desolventizing DTC
The damp meal discharged from the base of extractor is conveyed into upper part of the pre-desolventizing layer of DTC with scraper, heating with oblique steam, make portion of solvent evaporate, meal temperature rises pre-desolventized meal falls into desolventizing layer, make use of CZPTary steam from desolventizing layer to eliminate the solvent from the meal, afterwards meal falls into desolventizing layer, feed immediate steam, the steam is injected into meal from small holes at the bottom for steam distillation of solvent in meal,to take away the solvent,element of steam condenses in the food, play a function in destroying active enzyme in the mealthe desolventized meal falls to the bottom of drying layer by discharge valve for drying,the dried meal is cooled in the cold air layer and then discharged by scraper and sent to the meal warehouse by the horizontal scraper.,
C.Evaporation, steam stripping
The miscella by way of the cyclone hydraulic separator go into the No. 1 evaporator, the DT vent can be used as the heating supply of the NO. 1 evaporator. The evaporated solvent discharge into the evaporator condenser by means of the prime of No. one evaporator separator, the vacuum of evaporator condenserkeep by the steam ejector. The concentrated miscella discharge from the No. one evaporator separator at the base, heated by the miscella heat exchanger and entered into the No. two evaporator. The No.two evaporator use the indirect steam heating. The evaporated solvent gasoline go into the evaporation condenser with the solvent gas evaporated by the No.1 evaporator. The No.one and No.2 evaporator are in the same vacuum. The CZPT concentrated miscella flow out from the No.2 evaporator separator, pumped into the upper of oil stripper. The steam go into the oil stripper from bottom, eliminate the residue solvent in the miscella. The vents go into the stripper condenser,the vacuum in the oil stripping condenser maintained by higher vacuum jet pump. At the bottom of the steam stripping tower, there is alevel control equipment, which can assure the regular flow of the liquid seal and finished oil. The crude oil attract out by the stripper pump,after cooling, the crude oil pump into the oil storage tank.
.D.Solvent cooling and drinking water separation segment
Uncondensed vapor of the stripping condenser is pumped into the shell pass of No.1
evaporator by vacuum jet pump, uncondensed vapor of the evaporation condenser is pumped
into the shell pass of No.1 evaporator by vacuum jet pump, uncondensed vapor of shell move
of No.one evaporator enters the bottom of power saver, heat trade with refreshing solvent, the vapor that has not been condensed enters the atmospheric condenser for further condensate. Condensate of evaporation condenser and steam-stripping condenser is pumped to h2o separation tank.The condensate of the very first evaporator, the economizer shell condensate and other condensers flows into the drinking water separator, and right after the water is divided, the solvent enters the solvent turnover library.The fresh solvent pumped to the economizer to warmth exchange and enter the extractor for recycling. The wastewater divided by the h2o separator enters the steaming drinking water tank,after evaporated the residual solvent and discharged into the h2o sealing tank.
2.two.five Tail gas absorption
Uncondensed vapor out from vent condenser enters from the bottom of absorber, lean
oil sprays down from the upside of the absorber, counter at present speak to vent by means of packing
layer to take up solvent, absorbed vent discharges into environment by vent fan through flame
arrester from the prime of absorber .
Rich oil which absorbs solvent is pumped into the heat exchanger between lean oil and wealthy oil, then heated by abundant oil heater, and enters tower from the upside of desorber, inject immediate steam from the bottom of oil stripper to desorber, desorpted fuel enters evaporator condenser, lean oil enters absorber to recycle following heat exchanging and cooling.
two.3 Process attributes
1.Adopt loop extractor and large capability recycle pump, with positive aspects of great permeation impact and lower solvent price in the meal, make confident the residual oil in meal not a lot more than
one.% under the circumstance of smaller material-solvent ratio. It can improve theconcentration
of the miscella, reduce the solvent in the food,and reduced solvent evaporation greatly.
2.Adopt adverse stress evaporation, reduce evaporation temperature, use DT vent from DTDC and the steam from steam-jet pump to heat No. 1 evaporator,saved heating
steam of No. one evaporator.
three.Use warmth exchanger in paraffin recovery process, exchange heat amongst higher temperature paraffin lean oil and low temperature paraffin rich oil, which saves part of heating.
four.Adopt exceptional steam entice to reduce steam consumption in workshop, at the exact same time, accumulate all the steam condensate and pump into it to the boiler place for recycling, economize soft water and thermal strength.
Crude extraction oil CZPT:
|Humidity and volatile subject ≤
|Residue solvent in crude oil ≤
Usage index :
|CZPTtricity consumption ≤
|≤17.5kwh/t (like forbidden area facility)
|Steam consumption ≤
|CZPT water consumption
|The one%-three% of circulating water quantity
- CZPTtric usage , not contain the exterior products of extraction plant (this sort of as the
cooling h2o tower, cooling drinking water recycle pumps).
- steam intake is based on steam gauge strain eight-10bar(G), and environment
- Solvent consumption is based on commercial n-hexane, and boiling level assortment sixty six-69ºC