Product specifications after revamp to DWC
iC rich to premium gasoline pool
C 5 sidecut
Bottoms
Stream description
Feed
IC 5 product 18,887
mix
petrochemical naphtha
Light naphtha
H S
NC rich with CS
194,000
49,952
125,162
Total flow, kg/hr Composition, mass% C 4 and lighter IC 5 NC 5 Others CS 2, ppm
Full range naphtha
Naphtha splitter
NH unit
4.60 90.00
0.45 13.97 15.59 69.99 70
0.01
0.00 0.13 1.21
19.88 55.56 24.54
5.24 0.11 100
98.66
NS bottoms
200
<1
PCN with CS <1ppm
content remained between 1 and 2 ppm. The NHT unit was debottlenecked so that after the revamp only the midcut, which carried most of the CS2, was routed to the NHT unit, as shown in Figure 5 . The facility also had additional revenue for obtaining iC 5 rich stream as the top product, which is sold as premium gasoline. The successful performance test for the revamp was completed at the end of 2021. Figure 5 shows the configuration of the facility after the revamp. The product specifications after the revamp to DWC is summarised in Table 3 . Conclusion In one of the many and varied applications of divided wall column technology, its use to obtain PCN with stringent CS 2 specifications is less tedious and an economically viable route than other conventional methods. As DWCs are robust operationally and the revamps are easy to take up, this technology has seen a resurgence over Figure 5 Flow diagram after revamp of depentaniser into divided wall column.
Table 3
the last decade. Not only has it paved the way to find areas in facilities where optimisation in terms of lowering CAPEX and OPEX is required, but it has also helped to obtain desired product specifications compared to other conven - tional ways employed in the facility. Manish Bhargava is Director, DWC Innovations in Houston, Texas. He has over 17 years’ experience in process optimisation solutions and distillation, and holds a MS degree in chemical engineering from Illinois Institute of Technology, Chicago and a Bachelor’s degree in chemical engineering from MNIT, Jaipur. Anju Patil is Head of India Operations for DWC Innovations. She has over 17 years’ experience in process simulators, distillation, and refin - ery processes . She graduated in chemical engineering from Malviya National Institute of Technology, India. Niyaz Ahmad is a Senior Process Manager at DWC Innovations. He has 14 years of experience in process design, simulation, and energy optimisation using dividing wall column technologies. He holds a BS degree in chemical engineering from Aligarh Muslim University.
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