Dependable pure hydrogen
UOP offers the most reliable processes to produce high purity hydrogen to help you meet new clean fuel regulations and realize more product per barrel of crude oil.
For downstream processing, the high purity hydrogen from UOP Polybed™ PSA and Polysep™ Membrane Systems simply provide superior performance and a better bottom line.
Within the refinery, Polybed PSA and Polysep Membrane systems are typically used to recover and purify hydrogen from the following sources:
- Steam Reforming (Hydrogen Plants)
- Catalytic Reforming Net Gas
- Hydrocracker and Hydrotreater Purge Gases
- Hydrocracker Flash Gas
Polybed PSA and Polysep Membranes are typically found in multiple locations within the refinery flowscheme.
Which technology is the best fit for my hydrogen purification and recovery application? The specifics of your hydrogen application (flow rate, pressure, product purity, etc.) are used to select the optimum technology solution.
The UOP Polybed PSA System is a cyclical process in which the impurities in a hydrogen containing steam are adsorbed at high pressure and subsequently rejected at low pressure. The hydrogen produced is at just slightly below the feed pressure and is typically upgraded to 99.9+% purity with hydrogen recoveries of 60 to >90%. UOP has provided more than 1000 Polybed PSA Systems in more than 70 countries. The vast majority of the Polybed PSA Systems have been in hydrogen service. View the standard PolyBed PSA System flow scheme
The economic justification for a PSA unit will depend on the H2 content of the feed stream and the how the customer values chemical hydrogen versus hydrogen as fuel. Generally the following rules apply:
- Hydrogen feed concentrations > 55% are easily economically justified.
- Between 40 and 50% H2 can be economically upgraded dependent on site specific requirements
- Below 40% H2, economics become more difficult to justify.
The UOP Polysep Membrane System separates a gas mixture by the differences in permeation rates of various gases through the polymeric membrane. The more permeable gas (hydrogen) is enriched on the permeate side of the membrane, while the less permeable gas enriches on the feed side of the membrane. The membrane separation of these gases is a pressure driven process and requires a high feed pressure. The hydrogen product stream is produced at a lower pressure by taking a pressure drop across the membrane. The non-permeate stream is available at essentially feed pressure. The membrane process is continuous, and produces permeate and non-permeate streams at constant flow, pressure and purity.
The membrane process is the most economical process for high pressure purge gas upgrading. The membrane system is normally designed to produce hydrogen at 300-600 psig, 92-98 vol-% purity, and 85-95% hydrogen recovery. The product delivery pressure is chosen to allow the product to enter one of the stages of the make-up hydrogen compressors. Since the Polysep Membrane system was commercialized in 1985, UOP has provided more than 80 Polysep Membrane systems. View the standard PolySep Membrane System flow scheme.
Available UOP Services provide you with the pre-commissioning, commissioning, debottlenecking, troubleshooting, upgrades, revamps and optimization services for flawless start-up, smooth operation and optimal performance.
Contact us for more information.