This higher-alloy and graphite constructed hydrochloric acid (HCl) recovery system was designed by Sabic. It can handle up to 24 m3/hr of liquid feed and separate out the organics, water, and HCl in aqueous form. The system includes a main distillation column for HCl removal, four HCl absorbers, an HCl regeneration column, and an HCl water removal column.
The previous service was for the recovery of 3% HCl in a wet phenol stream.
Subsystem from a Complete Bisphenol-A (BPA) Plant Stock #600363
HCl Recovery System Process Flow Diagram
In this design, the product feed enters the top of the acid removal column which operates at 133°C bottoms temperature and 0.17 bar of pressure. The column overheads leaves at 60°C and is partially condensed. The liquid from the condenser goes to an acid-organic separator where the organics float out the top and the aqueous HCl goes out the bottom. The vapors from the condenser proceed to four HCl vacuum absorbers.
The HCl streams from the acid-organic separator and the vacuum absorbers combine in an accumulator to feed the HCl regeneration column. This column operates at 130°C and 2.0 bar of pressure. The bottoms stream from this column feeds the water removal column which operates at 60°C and 0.17 bar of pressure. The aqueous HCl is concentrated to 23% in this particular operation, but this is adjustable.
This HCl recovery system includes the following major components:
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