The Process  


        

Preparation of Seeds

The processing of seeds for oil extraction involves the following steps:

  • Seeds are passed through cleaners to remove all foreign matters like mud bolls, stem, pods etc.
  • Seeds are passed through Magnetic separators to remove metallic impurities
  • Pre-cleaned seeds are passed through de-stoner, where heavy stones are removed
  • Clean seeds are passed through 2 pairs of cracker rolls to crack the seeds into 6-8 pieces
  • Cracked seeds are stored in the Tempering bin after adding 1-3% moisture for tempering
  • Materials are cooked and conditioned with open steam at 80-90c to make it suitable for making flakes
  • Tempered seeds are passed through high speed rolls under 50 bar pressure to produce flakes
  • Flakes are passed through extruders under pressure with open steam to produce pellets. This operation makes most of the oil bearing cells rupture and makes oil extraction easier.Refining of Vegetable Crude Oil

Extraction of oil from seeds

The pellets are fed into the extractor at the solvent extraction plant for oil extraction along with solvent hexane, where extraction process takes place in several stages. At the end hexane and vegetable oil mixture, called miscella, is taken in the distillation section. Here solvent hexane is recovered from crude oil and recycled for further extraction process. Crude oil so obtained is stored in crude oil tanks for processing.

Treatment of Extracted

Meal The de-oiled spent meal is taken in DTDC vessel, where the material is desolventised, toasted, dried and cooled, in this process, maximum recovery of solvent, uniform toasting to achieve the desired urease activity level, optimum steam consumption, low power consumption design feature are taken care.

The Process

Refining of Vegetable Crude Oil

The following operations are carried out to convert vegetable crude oil into refining vegetable oil fit for human consumption:

  • Degumming of Vegetable Oil
    The crude oil is treated with hot water to remove hydratable phosphates which upon drying becomes food grade Lecithin
  • Removal of free fatty acids
    Measure excess caustic soda is added in the degummed oil along with phosphoric acid to remove unwanted free fatty acids and non hydratable phosphatites. The neutral oil so obtained is then washed with hot water to remove traces of soap and finally dried
  • Bleaching
    Neutral oil is treated with measured quantity of bleaching earths at bleacher under vacuum to remove all colouriferous matters and peroxides
  • Deodorization
    Bleached oil is deodourized at high temperatures and very low vacuum to remove odoureferous compounds including low molecular weight free fatty acids and thermo bleachable materials. The by product recovered at this stage is fatty acid which is rich in Vitamin E
  • Waste water treatment
    Process water generated during the refinery operation containing oil and grease being major objectionable components are sent to the water treatment plant where the water quality is brought to acceptable limits of BOD, COD, suspended solids and oil & grease.