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water > Strongly Basic Anion (SBA) > Flashcards

Strongly Basic Anion (SBA) Flashcards

1
Q

What functional groups do SBA resins contain?

A

Quaternary ammonium compounds

SBA resins can be used with chloride or hydroxyl as exchange ions.

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2
Q

What ions do SBA resins remove when using hydroxyl as the exchange ion?

A

All anions

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3
Q

What ions do SBA resins remove when using chloride as the exchange ion?

A

Nitrate, sulphate, and several other ions

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4
Q

What is the operation reaction for chloride ion exchange?

A

2 Resin-Cl + SO42- → (Resin)2-SO4 + 2Cl

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5
Q

What is the regeneration reaction for chloride ion exchange?

A

Resin2-SO4 + 2NaCl → 2 Resin-Cl + Na2SO4

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6
Q

What is the operation reaction for hydroxyl ion exchange?

A

Resin-OH + NO3 → Resin-NO3 + OH-

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7
Q

What is the regeneration reaction for hydroxyl ion exchange?

A

Resin-NO3 + OH- → Resin-OH + NO3

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8
Q

What is used as the regeneration solution for hydroxyl ions?

A

Sodium hydroxide

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9
Q

What is used as the regeneration solution for chloride exchange ions?

A

Sodium chloride

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10
Q

Why are SBA resins with chloride exchange ions seldom used for brewing applications?

A

They have lower efficiency in removing alkalinity from feed water.

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11
Q

What are the three types of SBA resins?

A

Type I, Type II, and acrylic

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12
Q

Which type of SBA resin is more effective in removing silica?

A

Type I

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13
Q

What undesirable byproduct does Type I SBA resin produce?

A

Amine with a strong fishy smell

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14
Q

What happens to the pH of treated water when using hydroxyl ions?

A

Remains unchanged

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15
Q

What happens to the pH of treated water when using chloride ions?

A

Slight drop

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16
Q

What is the main function of WAC ion-exchange units?

A

Removes Ca²+ and Mg²+ associated with bicarbonate ions in alkaline conditions.

17
Q

What is the regeneration chemical for SAC ion-exchange units?

A

NaCl, KCl, or strong acids (H2SO4 or HCl)

18
Q

What is produced by WAC ion-exchange units?

19
Q

In a serial ion-exchange system, what can be achieved by using SAC and WBA in series?

A

Full de-mineralisation (de-ionised water)

20
Q

What is the benefit of using a mixed bed system?

A

Delivers excellent treated water quality

21
Q

What is a drawback of mixed bed systems?

A

Difficult to regenerate

22
Q

What water quality parameters can negatively affect ion exchange resins?

A
  • High levels of free chlorine
  • High salinity
  • High or low temperatures
  • High turbidity
  • Excessively high or low pH
23
Q

What factors determine the best resin for a particular application?

A
  • Composition of incoming feed water quality
  • Desired product water quality
  • Availability and price of regenerant chemicals
  • Existing water treatment system infrastructure
  • Price of resins
  • Nature of effluent produced by the resins

water (29 decks)

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