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Switch Condensers: download brochure
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Switch Condensers Over 50 years experience in the field of the process for phthalic anhydride production led to the development of the present generation of 4-bundles Switch Condenser able to guarantee excellent yields with gas flows at high loads. Such higher efficiency ensures a valuable energy saving, a reduction of the necessary size to reach the requested production, and a better and optimized operation of the plant.

The consolidated experience in this type of Switch 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 Switch Condenser; avoiding, in such a way, back pressure phenomena that could affect the catalyst life-time in the long run.
 
Switch Condensers
 
Switch Condensers
 
 

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 consumption
better control of oil flows
better operating flexibility
longer life-time
Switch Condensers


AVAILABLE STANDARD MODELS
TYPE*
CAPACITY
ton/year

SURFACE m2

SW.COND. No.
DISCHARGE kg/h
OIL FLOW m3/h
GR1
12,000
1,000
4
1,500
26
GR2
18,000
1,500
4
2,250
38
GR3
24,000
2,000
4
3,000
51
GR4
36,000
3,000
4
4,500
77
GR5
48,000
4,000
4
6,000
102
* 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 8,500 h/year
O-x load 95 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 180 °C



SWC GENERAL SPECIFICATIONS
Surface 1,000 ÷ 4,500 m2
Gas flow
-initial
8 m3/m2
                                           
-final
4 m3/m2
Pressure drop                         
-initial
150 mm H2O
                                            
-final
450 mm H2O
Time of condensing cycle (4 SWC's) 180 min
Time of melting - precooling cycle (4 SWC's) 60 min
Specific PA load 1.4÷ 1.7 kg/m2
Separation efficiency 99.6 ÷ 99.8 %


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 bundles.
                         ROLLECHIM S.r.l. Sovizzo - Vicenza - Italy Phone +39 0444551955 Fax +39 0444536278 info@rollechim.com