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Canola Extraction Time – LM Type Desmet

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  • Autor
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    • junio 6, 2026 a las 12:19 am #5294

      RAJARAMESHPULI
      Participante

      Dear all,

      Could you please share the standard solvent extraction  time normally used for canola pre-pressed cake extraction, along with the calculation method used to estimate it?

      Your feedback or any standard reference would be highly appreciated.

      Thanks in advance for your cooperation.

      Kind regards,
      RajaRamesh P.

    • junio 6, 2026 a las 12:53 am #5295

      Hector Autino
      Participante

      Dear Colleague: The ideal residence time in the solvent extractor to achieve a low residual fat content in the Canola meal at the outlet is between 85 and 90 minutes.

      To do the residence calculation, you need to know how many tons of press cake enter the extractor per hour, the width of the extractor, the length of the solvent and miscela washing sections, and the height of the material. With this data, you can calculate the volume and, knowing the density of the material, the amount in tons, which will allow you to estimate the residence time of the cake inside the equipment.

      Please let me know if you have some doubts or additional questions.

       

      Best Regards Héctor

       

    • junio 6, 2026 a las 1:30 am #5296

      RAJARAMESHPULI
      Participante

      Dear Hector,

      Thanks for your reply.

      Our cake input to the extractor is approximately 21 T/hr. The bed width is 2.0 m and the average bed height is around 2.2 m. We have seven spray pumps, and the effective washing length is approximately 10 m( considered up to sprays – 7). The total extractor length, centre-to-centre between sprocket wheels, is 18.535 m. Fresh hexane addition is located around 1.1 m from the last, 7th spray section.

      Based on the effective washing area, the volume calculation is:

      Washing volume = 2.0 × 2.2 × 10 = 44 m³

      Considering a bulk density of 0.55 t/m³:

      Cake mass in washing zone = 44 × 0.55 = 24.20 tons

      Therefore, the estimated extraction residence time is:

      Residence time = 24.20 ÷ 21 × 60 = 69.14 minutes

      So, based on these assumptions, the extraction time is approximately 69 minutes.

      Could you please confirm whether this approach is correct, or if we should consider the full extractor length of 18.535 m instead of only the effective washing length? Also, please advise if any correction factor should be applied for cake bed porosity, chain/pocket filling, drainage zones, or non-uniform bed movement.

      Once again, many thanks for your support. I look forward to your reply.

      Regards,
      RajaRamesh P.

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