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Brine purification before a membrane cell removes

  • A.the dissolved chlorine in the feed
  • B.the greater part of the water
  • C.calcium and magnesium to a very low level
  • D.virtually all of the sodium chloride content

Answer: C

Correct answer: calcium and magnesium to a very low level

Hardness ions must be brought down to parts per billion before brine enters a membrane cell, which takes precipitation with soda ash and caustic followed by ion-exchange polishing. It is the most demanding purification in the plant, and the reason is given directly in the next item.

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