scale-up devulcanizationup devulcanization of recycled
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SCALE UP DEVULCANIZATION OF RECYCLED TIRE RUBBER WITH SUPERCRITICAL COSCALE-UP DEVULCANIZATION OF RECYCLED TIRE RUBBER WITH SUPERCRITICAL CO2SCALE UP DEVULCANIZATION OF RECYCLED TIRE RUBBER WITH SUPERCRITICAL CO22
Costas Tzoganakis Mohammad Meysami and Shuihan ZhuCostas Tzoganakis, Mohammad Meysami and Shuihan ZhuCostas oga a s, o a ad eysa a d S u a uDepartment Of Chemical Engineering University of WaterlooDepartment Of Chemical Engineering, University of WaterlooDepartment Of Chemical Engineering, University of Waterloo
Waterloo Ontario CanadaWaterloo Ontario CanadaWaterloo, Ontario, Canada
S l f bb d l i i Background Scale up of rubber devulcanization processBackground Scale up of rubber devulcanization processg p f pD l i i f bb i h CO i d i i ll f i dl i 1 Specific energy consumption calculation Material Extruder/Screw Feeding rate Screw speed ScCo Rate Process•Devulcanization of waste rubber with scCO2 in an extruder is an environmentally friendly continuous process; 1. Specific energy consumption calculation Material Extruder/Screw Feeding rate Screw speed ScCo2 Rate Process evu ca at o o waste ubbe w t scCO2 a e t ude s a e v o e ta y e d y co t uous p ocess;M t i l i i f d l i d bb ff t f th l ti l i t (TPV)
p gy pfi ti (lb/h ) ( ) ( / i ) diti•Materials engineering of devulcanized rubbers offers new types of thermoplastic vulcanizates (TPV); configuration (lb/hr) (rpm) (gr/min) conditiong g yp p ( );
Lab scale de ulcani ation process of rubber crumbs usin a t in scre e truder has been established Kw (applied) = Kw(motor rating)×(%torque)×(rpm g ( ) ( p ) (g )
•Lab‐scale devulcanization process of rubber crumbs using a twin‐screw extruder has been established; Kw (applied) = Kw(motor rating)×(%torque)×(rpm p g•In scale up trial volatiles generated during devulcanization can blast out of the exit of extruder periodically
pp g q p10 h CR 50 / #2 50 111 N U t bl•In scale‐up trial, volatiles generated during devulcanization can blast out of the exit of extruder periodically.
running/max rpm) 0 97 10 mesh CR 50mm / #2 50 111 No gas Unstablerunning/max rpm)×0.97 / g
Objectivesg p ) 97
30 h C 0 / 3 0 0 S blObjectivesS ifi E ti K ( li d)/K 30 mesh CR 50mm / #3 10 40 5 StablejSpecific Energy consumption = Kw(applied)/Kg per 30 mesh CR 50mm / #3 0 40 5 StableSpecific Energy consumption Kw(applied)/Kg per
• To achieve a higher throughput of the devulcanized rubber for cost‐ reduction ; h 30 mesh CR 50mm / #3 10 50 5 StableTo achieve a higher throughput of the devulcanized rubber for cost‐ reduction ; hour 30 mesh CR 50mm / #3 10 50 5 Stable• To maintain the degree of devulcanization in the scale‐up devulcanization ; hourTo maintain the degree of devulcanization in the scale up devulcanization ;T i i h d fi d h i i d id h l il 2 Process variables and conditions 30 mesh CR 50mm / #3 20 50 5 Stable•To optimize the process and find out the processing window to avoid the volatile 2. Process variables and conditions 30 mesh CR 50mm / #3 20 50 5 StableTo optimize the process and find out the processing window to avoid the volatilebl ffblast‐off . 30 mesh CR 50mm / #3 20 100 No gas Unstable30 mesh CR 50mm / #3 20 100 No gas Unstable
S C fi ti S S d F di R tD l i i
Screw Configurations Screw Speed Feeding Rate 30 mesh CR 50mm / #4 50 200 10 StableDevulcanizationg p
( )g
(lb/h )30 mesh CR 50mm / #4 50 200 10 StableDevulcanization (rpm) (lb/hr)
1 T i i CO i j i d d i i i ( p ) ( / )
S #1 50 20 30 mesh CR 50mm / #4 20 50 5 Stable1. Twin screw extrusion, CO2 injection, and data acquisition Screw #1 50 20 30 mesh CR 50mm / #4 20 50 5 Stable1. Twin screw extrusion, CO2 injection, and data acquisition S #2 100 50Screw #2 100 50
30 h CR 50 / #4 50 200 10 St blS #3 200 100
30 mesh CR 50mm / #4 50 200 10 StableScrew #3 200 100
S C 2 i j iC l l S #4 220
Sc Co2 injection system30 h CR 50 / #4 60 200 5 St blVal e Val e
Control Panel Screw #4 220j y
30 mesh CR 50mm / #4 60 200 5 StableValve ValveS #5
/Feeder Screw #5
h / blCO S #6 30 mesh CR 50mm / #4 100 50 5 StableCO250 rpm200 C
Screw #6 30 mesh CR 50mm / #4 100 50 5 Stable
S i PCylinder200 C
S #7Syringe Pumph l
Screw #7 10 mesh CR 50mm / #4 50 100 5 StableThermocouples 10 mesh CR 50mm / #4 50 100 5 Stable
b l ( fl )3 Process Stability (Pressure fluctuations)3. Process Stability (Pressure fluctuations)Gear 2000
box 1400boxExtruder PressureExtruder Pressure
Transducers Die 1800Transducers1200
1600
1000 1400
si si
ps p
50 i d (L i i I Nj)2 C fi i f p,
p p,
120050 mm twin screw extruder (Leistritz Inc. Nj)2. Configurations of screw 800m
p mp( j)
2. Configurations of screw 800
Am Am
R bb b CO rpm
m, A m, A 1000 rpmRubber crumbs CO2
rpm
Ampm pm
rpm
Amp
600
Amp
PressureRp Rp Amp
Pressure
1 2 3 4 5 6 7 98 10600R R
8001 2 3 4 5 6 7 98 10
600400
400
2008* 8*
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GF 8 200*K *KFA FA FA FA FA FA FA FA
*KS
FA FA FA FA FA FA FAFA FA
GFAFA FA FA 8*S K
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S1- 1-21-2-45
-45
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-45-45-45-45-30-2--30-30-20
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5-65-35-35-30-6-7.50-30-30-6
0-6
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0-30-3
0-3
0-1
0-30-30-3 7.5 1 21 41 61 81 10
112
114
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128
130
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140
142
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156
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164
166
168
170
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174
176
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180
182
184
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190
192
194
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102
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1 1 32 63 94 125
156
187
218
249
280
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342
373
404
435
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621
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737.5 .5N20
60 60 60 30 30 30 60 5 30 30 60 60 60 60 3030 30 120
30 30 30L5 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 4 4 4 4 4 5 5 5 5 5 6 6 6 6 6 7 7 7 7 7 8 8 8 8 8 9 9 9 9 9 10 10 10 10 10 11 11 11 11 11 12
2 2 2 3 3 3 4 4 4 4 5 5 5 6 6 6 7 7 7 9 9 9 9 10 10 10 1 1 1 12 12 12 13 13 13 13 14 14 14 15 15 15 16 16 16 17 17N0 0L
Time (S) Time (S)Time (S) Time (S)
Stable Process U t bl PStable Process Unstable ProcessProcess condition:3 Devulcanization mechanism Process condition:Process condition:3. Devulcanization mechanism Process condition:Temperature: 220 oC Temperature: 220 oCpScrew Speed: 100 rpm
Temperature: 220 CS S d 100Screw Speed: 100 rpm Screw Speed: 100 rpm
Flow Rate: 50 lb/hr.p p
Flow Rate: 50 lb/hrFlow Rate: 50 lb/hr.S #6Crosslink
Flow Rate: 50 lb/hr.Screw #6Vulcanized rubber Crosslink Screw #4Screw #4
C l di R kS Concluding RemarksSYConcluding Remarks
Y
Devulcanization of ground tire rubber crumbs under stress in the twin screw extruder with supercritical CO is aDevulcanization of ground tire rubber crumbs under stress in the twin screw extruder with supercritical CO2 is a g p 2 continuous cost effective and environmentally friendly process;continuous, cost-effective, and environmentally friendly process;, , y y p ;A bl hi h th h t f d l i d bb h b bt i d i th l d l i ti i t iA reasonably high throughput of devulcanized rubber has been obtained in the scale-up devulcanization process in a twin y g g p p p
t d hi h i t blTypical devulcanized samples : screw extruder, which is stable;Typical devulcanized samples : , ;Th l til t d d i t i b t ll d d fi ti f di t d th da) Samples of de lcani ed r bber in strand shape The volatiles generated during extrusion can be controlled and screw configuration, feeding rate and the screw speed are CO a) Samples of devulcanized rubber in strand shape g g g , g pth k t t t l th t bilit
CO2the key parameters to control the process stability.SY
b) Devulcanized rubber ribbons exiting the die; the key parameters to control the process stability.SYb) Devulcanized rubber ribbons exiting the die;
ACKNOWLEDGEMENTSc) Samples of devulcanized rubber in ribbon shape ACKNOWLEDGEMENTSc) Samples of devulcanized rubber in ribbon shape
IPR 20
08