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FT66 Neutraliser/Washer/Bleacher

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Modes of operation


Crude oil, freshly extracted from seed contains undesirable impurities, which must be removed. These include free fatty acids, phosphatides, colour pigments and fine particles.

Using the FT66, the crude oil can be refined by operation in the following modes:-

Neutralisation/Washing:
Free fatty acids are removed by neutralising them with a strong base such as caustic soda, which forms a water- soluble soap. The soap is then removed by a combination of thorough washing, gravity settling and draining.
Phosphatides are also removed by washing, settling and draining after the addition of phosphoric acid to form water-soluble gums. Any water remaining in the oil is dried by heating the oil under vacuum.

Bleaching:
Colour pigments are removed or reduced by the addition of an adsorbent such as Fullers Earth.
The desired colour of the oil can be obtained by adjusting the amount and type of earth used and the physical conditions under which the bleaching operation is carried out.

Filtration:
After bleaching, an efficient filtering process ensures that the earth and other particulates are removed leaving a clean, refined oil ready for further processing such as hardening and deodorising.

The filter used for this is a pressure leaf type, which is commonly used in the edible oil industry for the removal of adsorbent.


Technical specifications

Reactor vessel

Material

stainless steel

Total volume

45 litres

Working volume

25 litres

Diameter

0.30m

Height

0.65m

Heating element

3.0kW

Cooling coil area

0.12m²

Agitator speed

250-1800rpm

Reagent vessel

Material

stainless steel

Working volume

3 litres

Diameter

0.165m

Height

0.20m

Heating element

1kW

Earth hopper

Material

stainless steel

Volume

0.3 litre

Pressure leaf filter

Material

stainless steel

Filter volume

3.8 litres

Filter cake capacity

1 litre

Filtering area

0.09m²

Filter screen

110 mesh (0.3mm wire)

Maximum pressure

3.0 bar

Vacuum pump

Type

liquid-ring

Sealant

water

Working vacuum

75mm Hg (ABS)

Sealant flow rate

8 l/m

Performance

Independent tests carried out by Manchester Metropolitan University, Hollings Faculty using crude Rapeseed oil gave the following analytical results

 

Crude Oil

Neutralised

Bleached

Iodine value

117

117

117

Free fatty acid

1.5%

0.12%

0.1%

 

Colour

70 Yellow

50 Yellow

20 Yellow

 

7 Red

3.3 Red

0.5 Red

 

3.2 Blue

 

 

 

Soap in oil

—

<100ppm

nil

Peroxide

0.4 meguiv/kg

nil

nil



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FT66,Neutraliser/Washer/Bleacher

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