Discage Reactor spray vacuum final Polyester reactor Polymer PET
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Uhde Inventa-Fischer
UIF lesson:
Polyester Process
®
Part 4: DISCAGE
& VACUUM SYSTEM
January 2011
Martin Hittorff
Uhde Inventa-Fischer's PET Technology
Contents
what is PET
... Raw materials
... UIF's PET processes
Additives
... 2R - PET Technology
... Paste mixing
®
Tower Reactor (2R)
... ESPREE
®
Finisher
... DISCAGE
(Polycondensation)
... Vacuum system
... Melt filtration & distribution
... Chip production storage & transp.
... PET direct applications
®
® ,
DFC)
(MTP
, MTR
... Melt Conditioning (MC)
... PET Recycling (PETryc)
... Plant heating
Uhde Inventa-Fischer's PET Technology
®
... DISCAGE
Reactor
(Polycondensation)
Uhde Inventa-Fischer's PET Technology
NEW PROCESSES DEFINITION
PTA, IPA
EG
Ester 1
Ester 2
Prepoly
Finisher
Storage
SSP
PET resin
iV=0.72-0.82
Precursor
i V = 0.62 0.65
PTA, IPA
EG
®
ESPREE
®-
DISCAGE
MV
PET resin
AA Cond.
iV=0.65-0.85
Option FTR
PET resin
iV=0.62 0.68
BOPET Line
PTA, EG
®
ESPREE
®-
LV
DISCAGE
BOPET Line
BOPET Film
iV=0.62-0.65
PET resin
AA Cond.
PTA, IPA
EG
iV=0.65-0.85
Calendering Line
®
ESPREE
®-
DISCAGE
MV
Calendering Line
PET Sheet
iV=0.65-0.85
MTR® - Technology
Main Process Parameters
PET
50 80° C
atm.
Temperature
Pressure
120 min
Hold-up
1.3
1.5
Mole ratio
30
40 rpm
252
265 ° C
1.1
1.8 barg
60 80 min
88 92 %
265
275 ° C
500
1000 mbar
50 60 min
98 %
4,9
Stirrer
Temperature
Pressure
Hold-up
conversion
Temperature
Pressure
Hold-up
Conversion
DP
272
278 ° C
Temperature
60 / 10 mbar
Pressure
25 / 30 min.
Hold-up
20 40
275
285 ° C
DP
Temperature
0.6 2 mbar
Pressure
70 90 min
Hold-up
90
108
0.6 3.0 rpm
DP
Cage agitator
Uhde Inventa-Fischer's PET Technology
PFD; POLYCONDESATION
Uhde Inventa-Fischer's PET Technology
DESIGN REVIEW POLYCONDESATION
Uhde Inventa-Fischer's PET Technology
DESIGN REVIEW POLYCONDESATION
Uhde Inventa-Fischer's PET Technology
®
LV Reactor
DISCAGE
Requirements
High vacuum to force degasing
High surface renewal rate to force degasing
No dead spots & "Plug Flow"
Viscosity up to 250 Pa s
Residence time 90 120 min
2
/ (kg/h)
Surface renewal ~ 5 m
Product on discs ~ 45 50 %
Uhde Inventa-Fischer's PET Technology
®
LV Reactor
DISCAGE
Design
Cage type agitator
Design of the discs changes with increasing
viscosity, bucketwheel discs
> spoke discs
-> pipe-ring discs rombus type
Overflow weir in low viscosity section
Product temperature 282° C ... 286° C
Pressure < 1.0 mbar
Uhde Inventa-Fischer's PET Technology
®
MV Reactor
Marriage DISCAGE
400 mt/d
Uhde Inventa-Fischer's PET Technology
®
Reactor 500 mt/d
DISCAGE
®
LV
DISCAGE
PV-Tex (500 mt/d)
DIAMETER SHELL
®
MV
DISCAGE
Tango (600 mt/d)
4200 mm
4200 mm
10.5 m
12 m
0.6 - 3.0 rpm
1.8 rpm
~ 240'000 Nm
~ 600'000 Nm
NO
YES
< 285 ° C
< 286 ° C
IV / PN
0.64 / 110
0.84 / 165
VISCOSITY
~250 Pa s
~ 700 Pa s
@ 285 ° C
@ 286 ° C
92 t
134 t
LENGTH CAGE & DRUM
AGITATOR SPEED
AGITATOR TORQUE
HEATED DRUM
DISCHARGE TEMP.
EMPTY WEIGHT
Uhde Inventa-Fischer's PET Technology
Model Fluid Trials
PIPERING (G) ROMBUS + TRIANGLE
BEST PERFORMANCE IN
CO-OPERATION WITH
THE STRIPPER RODS
LOADING AND
EXCHANGE OF MATERIAL
IS ON THE PIPERINGS IS
OPTIMUM
Uhde Inventa-Fischer's PET Technology
Model Fluid Trials
PIPE-RING (G) ROMBUS + TRIANGLE
VERY GOOD LOADING OF
POLYMER ON THE DISC AND
FORMATION OF THIN FILM UP
TO HIGH VISCOSITY
AFTER CROSSING THE
HIGHEST POINT, NEW FILM IS
FORMED INDUCED BY THE
OUTER RING
Sense of rotation
anticlockwise
Uhde Inventa-Fischer's PET Technology
CFD Simulation
Model of DAK Reactor, simplification: ring-discs instead of MTR discs
Uhde Inventa-Fischer's PET Technology
Model Fluid Trials
STANDARD CAGE WITH RECTANGULAR HOLES
AT MEDIUM VISCISITY
UP TO 500 ... 600 Pas
THE MATERIAL EXCHANGE INSIDE THE CAGE STILL IS ACCEPTABLE,
POLYMER IS WHIPED-OFF BY DROPPING MATERIAL FROM TOP
Uhde Inventa-Fischer's PET Technology
STRIPPER RODS
Uhde Inventa-Fischer's PET Technology
STRIPPER RODS MEDIUM IV
Uhde Inventa-Fischer's PET Technology
®
LV
500 mt/d
DISCAGE
Uhde Inventa-Fischer's PET Technology
®
Shaft sealing (DISCAGE
)
Uhde Inventa-Fischer's PET Technology
®
LV Reactor
DISCAGE
600 mt/d in workshop
Uhde Inventa-Fischer's PET Technology
... EG Spray system
Uhde Inventa-Fischer's PET Technology
EG-Spray System
Requirements
Condensation of vapours from reactors
Prevention of entrainment
Removal of big size oligomer lumps / particles
Recycling of "good" oligomers
Uhde Inventa-Fischer's PET Technology
EG-Spray System
Design up to 600 tpd
1 stage for PE, 2 stage for PP & Discage
Piston type scraper (for Discage only)
Size increases with vacuum => low gas velocity
Temperature of spray EG decreases with
vacuum
Feed of fresh EG to hotwell Discage then
overflow backwards
Uhde Inventa-Fischer's PET Technology
EG-Spray System Design 500 t/d
Diameter
Gas velocity [m/s]
[mm]
in
top
bottom
out
20E23 PE
1200
8
0.3
0.01
1.3
20E33 PP
1250
85
35
15
75
20E36 Demister PP
1600
75
2.5
0.07
12
22E43
1250
90
47
16
60
22E46
3000
60
4.6
0.2
80
Demister Discage
