What is the reason for the high sulfur content in acidic water double-column stripping?

2016-08-07View Original

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What is the reason for the high sulfur content in the acidic water after double-tower stripping? Our plant’s acidic water stripping unit uses a double-tower system: Tower 1 is used for hydrogen sulfide stripping, while Tower 2 is used for ammonia removal. Tower 1 receives feedstock via both hot and cold streams, with the level of the hot feed being slightly lower than that of the cold feed. The reflux stream at the top of Tower 1 consists of purified water from the outlet of Tower 2. There is no direct steam injection at the bottom of the tower; instead, a reboiler is used there to heat the fluid inside the tower using steam as a heat source. What temperature should be maintained at the top of the tower, and what are the key parameters that need to be controlled?

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What is the reason for the high sulfur content in acidic water double-column stripping?

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