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Over
50 years experience in the field of the process
for phthalic anhydride production have led now
to the development of a new generation of 4 section
Switch Condenser able to guarantee excellent yields
with gas flows at high loads. The higher efficiency
leads to a regardable energy saving, a reduction
of the number and size of the necessary equipment
to reach the production goals and a better and
optimized operation of the plant.
The consolidated experience in this new type of
condenser lets to guarantee the condensation and
the discharge of phthalic anhydride in the pre-arranged
times. That is obtained with the number of units
tightly necessary, so reducing to the minimum
the pressure changes in the process lines at the
alternate switch of each condenser; avoiding,
in such a way, variations which could affect the
catalyst life-time.
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MAIN ADVANTAGES
higher efficiency
higher PA recover (>99.6%)
higher loads (=100 g/Nm3)
higher energy saving
lower pressure drops
lower installation costs
lower oil flow
better control of oil flows
better operating flexibility
longer life-time
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AVAILABLE STANDARD MODELS
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TYPE*
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CAPACITY
ton/year
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SW.COND. No.
|
DISCHARGE kg/h
|
OIL FLOW m3/h
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GR1
|
12,000
|
1,000
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4
|
1,500
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26
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GR2
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18,000
|
1,500
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4
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2,250
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38
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GR3
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24,000
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2,000
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4
|
3,000
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51
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GR4
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36,000
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3,000
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4
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4,500
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77
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GR5
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48,000
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4,000
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4
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6,000
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102
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* Rollechim is also able to supply
Switch Condensers with surfaces suitable for whatever
capacity requested by the customer.
| Basic
operating conditions suggested in the use of Rollechim
Switch Condensers: |
|
| Operating time |
8,200 h/year |
| O-x load |
85 g/Nm3 |
| Complete cycle
cond.+ melting |
180+60 min |
| Temperature in/out
gas |
160/70 °C |
| Temperature in/out
cold oil |
57/60 ÷
117 °C |
| Temperature hot
oil |
170 °C |
| SWC
GENERAL SPECIFICATIONS |
|
| Surface |
1,000 ÷
4,000 m2 |
| Gas flow |
-initial
|
8 m3/m2 |
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-final
|
4 m3/m2 |
| Pressure drop |
-initial
|
150 mm H2O |
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-final
|
450 mm H2O |
| Time of condensing
cycle |
180 min |
| Time of melting
- precooling cycle |
60 min |
| Specific PA load |
1.5 ÷ 1.7
kg/m2 |
| Separation efficiency |
99.6 ÷ 99.8
% |
Technological scheme:
The system of flows partitioning,
besides to reduce the cold oil circulation, guarantees
the optimisation in the load distribution of the crystallized
PA across the four sections. |
