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A plant loses \( 1.2 \) litres of hexane per tonne of seed processed. Handling \( 300 \) tonnes a day, the daily loss is

  • A.360 litres
  • B.250 litres
  • C.36 litres
  • D.3600 litres

Answer: A

Correct answer: 360 litres

The loss is a rate per tonne, so it scales with throughput:

\[ 1.2 \times 300 = 360\ \mathrm{litres\ per\ day} \]

The figure matters on three counts at once: hexane is bought and paid for, it is a fire and explosion hazard in the plant, and it is a regulated emission. Modern plants work to well under a litre per tonne, so 1.2 would prompt a survey of the desolventiser and the vent recovery system rather than being accepted as normal.

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