The depropanizer bottoms probably will be exported as an untreated C4 coproduct stream.
Depending on specific needs, it may be further fractionated into a C4 fraction (with high butadiene content) and a C5+ fraction.
Conclusion. The S&W ethane propane cracking/recovery scheme offers many technical, operational,and investment advantages.
It embodies several generations of process design evolution and the latest equipment and catalyst developments, integrated to achieve an optimal overall result.
Many of the features described are demonstrated in the Nova/Dow E-3 cracker, the world’s largest and most efficient ethane cracker.
This design results in a safe, reliable, and economic plant, achieving the lowest life-cycle costs.