ion exchange resin testing
TRANSCRIPT
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John GreeneConsultant
Ion Exchange Resin Testing
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Introduction
• Power Industry Background (MUWTP and CPP)
• Consider the Life Cycle of Ion Exchange Resins
• From Manufacture through to eventual Disposal
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One Possible Approach
• Consider Ion Exchange Resin Testing as part of a
• RESIN MANAGEMENT PROGRAMME
• “Do you want to pay me now or pay later?”
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Content
• Introduction• When to Test• Why Test• How to Test• Routine Tests• Specialised Testing• Sampling• Test Results• Conclusions• Questions
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When to Test
• Manufacturing/Production
• Pre-delivery
• Before Loading into Service Vessel
• Periodically
• Troubleshooting
• Prior to Disposal
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Manufacturer and Production
• Sampling and Testing for :
• Quality Assurance
• Traceability etc
• Specification Compliance
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Resin Specification 1
• Resin Properties:
• Application e.g. Softening
• Polymer Structure
• Appearance
• Functional Groups
• Ionic Form
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Typical Resin Specification for Cation Resin
• Total Capacity, Na+ Form (min) 1.8eq/l
• Moisture Retention, Na+ form 48 – 53%
• Mean Diameter 725 ± 125 µm
• Uniformity Coefficient (max) 1.7
• Reversible Swelling, Na+ to H+ 4%(max)
• Temperature limit, H+ form 120 ºC
• Temperature Limit, Na+ form 140 ºC
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Pre Delivery Samples
• Special Applications
• Check for Compliance with Specification
• Procurement Contract
• Demonstrate Informed Client
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Prior to Loading into Service Vessel
• Last Chance !!
• ARCHIVE SAMPLES
• No of Batches
• No of bags
• Visual Inspection
• Visual Microscopy
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Periodically
• Expected Resin Life?
• 2 years ? 5years ? 10 Years ?
• Condition Monitoring Programme
• Helps to identify a potential problem before it becomes a performance issue
• Trending Analysis
• Forward Planning, Purchases and Budgets
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Troubleshooting and Problem Solving
• Plant Performance Problems
• Investigations
• Resin Sampling and Testing
• One part of the Process
• Caution
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Resin Testing
• Routine Tests
• More Specialised Testing
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Routine Tests
• Visual Inspection
• Microscopic Inspection
• Separating the Resin
• Cation Capacity (total, strong and weak)
• Anion Capacity (total, strong and weak)
• Particle Size Distribution
• % Moisture retention
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Visual Inspection
• % Perfect Beads
• % Cracked Beads
• % Broken Beads
• Surface Condition
• Gel or Macroporous
• Particle Size Distribution
• Supernatant Liquor
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Slide with portrait image – image at user’s discretion
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Capacity - Cation Resins
• Capacity
• Total
• Strong
• Weak (by difference)
• % Moisture Retention
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Cation Capacity - Strong
CH2 CH CH2
SO3-H+
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Cation Capacity - Weak
CH CH2 CH CH2 CH CH2
CH CH2 CH CH2 CH CH2
Crosslinked Acrylic Acid
CO2H CO2H
CO2H CO2H
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Cation Resin Degradation
40
50
60
0 1 2 3 4 5TIME
% R
etai
ned
Moi
stur
e
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Anion Resins
• Capacity
• Total
• Strong
• Weak (by difference)
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Anion Capacity - Strong
CH2 CH CH2
CH2
CH3
N CH3H3C
Cl-Type I
+
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Anion Capacity - WEAK
CH2 CH CH2
CH2
CH3
NH3C
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Degradation of Anion Resins
0
25
50
75
100
0 1 2 3 4 5 6TIME
% R
emai
ning
Cap
acity
TOTAL
STRONG
WEAK
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Particle Size
• Standard Mesh (wet or dry)
• Visible Light or Laser
• Optical Cell
• Parallel light
• Gel resins
• Macroporous resins
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Resin Bead Size Distribution
µm1200900300 600
Number of beads
Uniformity coeff 1.5 to 1.9
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Uniform Beads
Uniformity coeff.
µm450 600 750 900
1.2
No
of B
eads
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Particle Size
0
10
20
30
40
200
300
400
500
600
700
800
900
1000
Bead Size / microns
Num
ber o
f Bea
ds
0
0
0
0
0
1
1
1
1
1
1
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Particle Size
0
5
10
15
20
25
30
35
40
45
100
200
300
400
500
600
700
800
900
1000
Bead Size / microns
Num
ber o
f Bea
ds
0
10
20
30
40
50
60
70
80
90
100
Cum
ulat
ive
Perc
enta
ge
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Statistics of Measurement
640
650
660
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Har
mon
ic M
ean
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Anion Kinetics
• Condensate Polishing Plants (CPP)
• High Flow
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Anion Kinetics
• Chloride
• Sulphate
• Carbon Dioxide
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Exchange Kinetics
B Resin Bead
A
B
A B
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MTC = V ln(C/C0)SZA
• MTC = Mass Transfer Coefficient (m/s)
• C0 = inlet anion concentration (mg/l)
• C = outlet anion concentration (mg/l)
• V = volumetric flow rate (m3/s)
• S = specific surface area of anion resin (m2/m3)
• Z = depth of resin bed (m)
• A = cross section of resin bed (m2)
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Specific Surface Area
• S = 3.9dHMS
• dHMS = harmonic mean diameter (m)
MTC = Constant x dHMS ln(C/C0)
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Effect of pH on MTC
0
0.5
1
1.5
2
2.5
4 5 6 7 8 9 10Influent pH
MTC
(10-
4 ms-
1)Cl SO4
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Column Tests
• Various Sizes
• Small Scale Laboratory
• Pilot Plant
• Follower Rigs on Plant
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Hydrazine Breakthrough for Resin A
-10
10
30
50
70
90
110
0 100 200 300 400 500 600 700 800 900
Hyd
razi
ne C
once
ntra
tion
(ppm
)
Time (mins)
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Breakthrough Curve for Resin A
-10
0
10
20
30
40
50
60
70
80
90
0 500 1000 1500 2000 2500 3000 3500 4000 4500
Con
cent
ratio
n (p
pm)
Time (mins)
Hydrazine
Ammonia
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ORGANICS
• Organic Extractables
• Organic Fouling
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Organic Fouling Measurement(KMnO4 method)
• Principle• Oxidise with potassium permanganate• Boil in acidic conditions• Titrate excess KMnO4
• Procedure• 100ml water + 2 ml 5 N H2SO4• Add 20 ml of 0.0125 N KMnO4• Boil for 10 minutes• Add 20 ml of 0.0125 N Mohr’s salt {(NH4)2Fe(SO4)2•6H2O}• Titrate the excess of Mohr’s salt with 0.0125 N KMnO4• Read volume required for titration = y ml• Organic matter = 4 y in mg/L as KMnO4 or y in mg/L as O2
There is no direct relation between KMnO4 and TOC measurement
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Sampling
• Most Important left to the end!
• Should be Representative
• Representative of What?
• Whole Bed
• Top of the Bed
• Bottom of the Bed
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Conclusions 1
• See Resin Testing as one part of the bigger picture
• Condition Monitoring – proactive
• Trouble shooting – reactive
• Trending
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Conclusions 2
• Resin Testing is only one weapon in the armoury
• Best used in conjunction with other Plant Monitoring Tools
• Generally modern resins are strong and robust
• Causes of Plant Performance Problems frequently lie elsewhere
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• QUESTIONS
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