Rapeseed Oil Production Line

1. Rapeseed Pretreatment and Prepressing Workshop

2. Rapeseed Cake Solvent Extraction Workshop

3. Crude Rapeseed Oil Refining Workshop



products description

The most common rapeseed oil production line includes followings three workshops:

(There are also other different production craft, our engineers can design the plant according to your requests)

1. Rapeseed Pretreatment and Prepressing Workshop

2. Rapeseed Cake Solvent Extraction Workshop

3. Crude Rapeseed Oil Refining Workshop

products detail

Section 1:  Rapeseed Pretreatment And Prepressing Workshop

—Flow Chart:



Rapeseed→ Cleaning and Stone Removing →Magnetic Separation→Flaking →Cooking →Prepressing→Oil Filtration →Crude Pressed Rapeseed Oil


                           Rapeseed Cake →To Extraction Workshop

—Quality Index of Prepressed Rapeseed Cake:
Oil residue in cake: 10-18%
Water content in cake: 2-3.5%


—Index of Main Consumption:
(Different capacity has different consumption, the greater levels of automation, the less consumption index. For example of 100TPD rapeseed pretreatment and prepressing workshop)

Electricity consumption: ≤50 kwh/t 
Steam consumption: ≤550 kwh/t

Water consumption:  ≤60kg

—Process Description of Rapeseed Oil Production Line:

This production line adopts mechanical and continuous production craft.

1). Cleaning and Stone Removing 

Adopts high efficiency cleaning screen, high strength flexible screen, so it has long using life, also it has features of impurities removing ratio.

The stone removing process adopts specific-gravity stoner, the working principle is taking advantage of the different materials' specific gravity to grade the rapeseed and remove the stones, avoid damaging the equipments.

2). Flaking Process:

The purpose of flaking is to destroy the rapeseed’s cell tissue which can make the oil separated smoothly. Also the flaking machine assembles alloy roller which using life is 1 time longer than common roller and also assembles automatic hydraulic roller tightening system to ensure the average thickness of flakes(≤0.3mm), the whole machine is sealed well.

3). Cooking Process:
The rapeseed oil production line dopts layer type cooking pot, the max distance between mixing wing and bottom of pot is 5mm for each layer, which avoid the nonuniform of raw materials. The whole pot is wholly sealed to keep the max humidity of the space of raw materials, to reach the best flaking effect and reduce the powder degree.

4). Prepressing Process

The machine adopts domestic mature ZY series pre-presser which specialized for rapeseed, the oil residue in cake after pre-pressing is about 10-18%, the rapeseed cake can adopt solvent extraction method to get more oil. The most features of this machine is low energy consumption, less occupied area, etc which is the first choice for rapeseed pre-pressing.

—Technical Highlight 

1). All the driving equipment adopts oil equipments special configuration, which has long using life and reliable working.
2). Higher mechanization and serialization, which can reduce labour working to reduce the labor cost,canola oil press machine.
3). More advanced dust removal system to ensure the tidy and clean of workshop, meanwhile reduce the discharge of powder.

Rapeseed Oil Production Line

Secontion 2:  Rapeseed Cake Solvent Extraction Workshop

—Flow Chart:


                                       Evaporation and Steam Stripping


        Rapeseed  Cake→Oil extraction→Mixed oil processing→Crude oil


      Solvent collection←Wet cake desolventizing→Finished cake

—Requests of Extraction Rapeseed Cake:
Water content: 5% more or less
Temperature for extraction: 50-55℃

Solvent ratio: 1: 0.5-1

—Main Consumption Index and Quality Index of Rapeseed Meal:
(Different capacity has different consumption, the greater levels of automation, the less consumption index. For example of 80TPD rapeseed cake solvent extraction workshop)
Electricity: ≤14KWH/t 
Steam: ≤350 Kg/t (environment temperature:20℃, 1Mpa saturated vapor)
Solvent: ≤3.5KG/t (vegetable oil extraction solvent(GB 16629-2008))

Water content of meal: 12-13%(adjustable)
Solvent residue in rapeseed meal: ≤500PPM
Oil residue in rapeseed meal:  ≤1%

—Process Description of Rapeseed Oil Production Line:
1). Solvent Extraction Procedure
The rapeseed cake gets into the extractor through feeding scraper, the materials run a circle from the feed inlet to discharge outlet in the extractor. Spraying the extruded canola with the concentrate diminishing miscella between the feed inlet to discharge outlet. Then before getting into the drain off section, spraying again with fresh solvent, the drained wet meal discharges into the wet meal scraper from the extractor’s discharge grid through kick-out device. The concentrated miscella gets into the two-stage hydrocyclone from the pump, to remove the powder impurities, finally get into the miscella tank. 

2). Desolventizing Procedure
The solvent contain wet meal that from the extractor are sent to the DTDC desolventizer’s pre-desolventizing layer by scraper through air locker, the bottom is heated by indirect steam to remove part of solvent; then the pre-desolventized wet meal get into the desolventizing layer, there are automatic control on the desolventizing layer to keep certain thickness of materials, then the bottom gets into the direct steam to remove all the solvent, at same time some steam condense in the meal, the moisture content of meal will sectional rise.

The desolventized meal of rapeseed oil production line falls onto the drying layer quantitative through rotary valve, the drying layer keeps certain materials level, then process the drying procedure, after drying get into the cooling layer to lower down the temperature, finally discharge the finished meal through automatic flow controlling gate, then though the scraper to transport the meal to warehouse. 

3). Evaporation Procedure
The miscella gets into the first long tube evaporation pass from the miscella tank, the evaporated solvent gets into the evaporation condenser through separation chamber, there are liquid level controlling device on the separation chamber’s outlet pipeline to keep the liquid seal, the miscella that after first evaporation concentration gets into the second long tube evaporator for evaporating process. The shell pas is heated by indirect steam, the evaporated solvent vapor gets into evaporation condenser through separation chamber, there are liquid level controlling device on the separation chamber’s outlet pipeline to keep the liquid seal. The miscella gets into the stripping tower’s disks from the top of the tower, then fall down layer by layer, meanwhile jet direct steam from the bottom of tower to remove the residue solvent.


The top exit of rapeseed oil production line connects evaporation condenser, the high vacuum jet pump keep the stripping tower working at negative pressure condition, also there are liquid level controlling device in the bottom of stripping tower to keep the liquid seal and steady flow quantity of product oil, the crude oil are extracted out from the bottom of tower through extraction pump, after cooling then get into crude oil, the of soybean oil making machine can collect the solvent of soybean oil extraction machine.

4). Solvent Condensation and Water Separation Procedure
The liquor condensate that from evaporation condenser, energy saver condenser and steam stripping condenser is collected together then through recovery pump to inject them into water segregator. The end condensed steam enter into the energy saver condenser, the energy saver’s liquor condensate and first evaporation shell pass’s liquor condensate get into the water segregator directly. The free gas of energy saver condenser,tripping condenser, water segregator and solvent library together enter into the final condenser, the end steam from final condenser is absorbed by paraffin recovery device. 

The solvent phase of water segregator flows into solvent library for partial recycling, the water phase discharged into steam tank, the direct steam gets into the steam tank from the bottom to evaporate residue solvent, after this the water phase discharged into water seal tank for of rapeseed oil production line.

4). Tail Gas Absorption Procedure 
The non condensed vapor from extraction evaporator, DT evaporator, oil stripper, cooking pot, water segregator and underground solvent tank, get into the final condenser for recovering the solvent, the non condensed vapor from the final condenser gets into the mineral oil recovery device, the free gas are discharged into air through fire barrier.

—Technology Highlights:
—Adopting micro negative pressure process, save steam and reduce energy consumption. 
—The secondary steam in the condensed water tank can be used for waste water preheating, reduce the steam consumption.

—Mixed oil adopts two levels process in removing impurity, dense mixed oil firstly into primary rotary liquid separator to remove larger particles, and then enter the secondary rotary liquid separator to remove impurity. After rotating liquid separation, the mixed oil nearly without solid impurities. After separation, the cleanermixed oil into the mixture oil staging tank for further precipitation, the bottom sediment of the mixing tank back into the extractor regularly by slag pump. Two process filter of the mixed oil and the use of negative pressure evaporation process, greatly reduce fouling in evaporation system, and evaporation system cleaning cycle can be extended. 
—Collection all the steam in the extraction workshop and pump into the boiler room for secondary use, effective utilize the waste heat, saving workshop production water.

Rapeseed Oil Production Line

Section 3: Crude Rapeseed Oil Refining Workshop

—Flow Chart:




                            Phosphoric acid, Lye and Hot Water                              Vacuum               

                             ↓                                                                 ↑ 

Crude oil→Dephosphorization, Degumming, Washing→Drying and Bleaching→Filtration 

                                        ↓                                               ↑                           ↓  

                                     Soapstock                            Bleaching Clay         Waste Clay


→ Deodorization→Refined oil


—Technology Description:
1). Degumming Section

The solid impurities in crude rapeseed oil will be removed by bag filter, and measured accurately by mass flowmeter, and then enter the degumming workshop to remove the colloidal, the crude palm oil heated will be ex-changed the heated, it will be fully mixed with phosphoric acid, the mixture will react in the acid tank. After the reaction and canola oil extraction machine, the alkali liquid will be added in, the partial neutralization reaction will be done here, and then the colloidal, starch and other impurities contains in oil will be separated out of rapeseed oil production line.
All temperature in the whole degumming process is automatic control and adjustable, and all operations can completely achieve in control room. 

2). Decoloring Section 
The decoloring section adopt 50 tons/day device. The degummed oil will be pre-heated by the deodorization refined oil, then it will be heated and enter pre-mixing tank. Meanwhile, the clay which is measured by metering device directly in clay tank, and then the measured clay will be added to the pre-mixing tank. After a fully mixing, the mixture of clay and oil will be sent into the decoloring tower, the color will be removed here. The decolorization reaction in decoloring tower of soybean oil extraction machine will last about 30-60 minutes.


Then the mixture of rapeseed oil production line will be pumped out and filtered by Armagh filter, the waste clay will be separated from the oil. The residue clay particle will be firstly filtered by the precision filter and then go into the gassing evolution tank to remove the moisture and volatile matter. The whole decolorization process temperature is self-control and adjustable. The filtration system has achieved the feeding oil automatically, circulation, filtration, baked cakes, slag and other operations by manual implementation . 

3). Deodorization Section
Gas substances from the decolored oil from the decolorization section will enter the deodorization section to remove the free fatty acids and unpleasant gas. All of this will be removed under the high vacuum circumsatnces by the deodorization tower. Using the to remove these substances by steam under high vacuum conditions. The removed fatty acid will be collected by the fatty acid trap and pumped into the receiving tank, this later will be used as vice products. 


Products images

Rapeseed Oil Production Line

Rapeseed Oil Production Line

Rapeseed Oil Production Line