A process that can: • Selectively remove H2S and COS in integrated gasification combined cycle…
Hydrogen (Polysep membrane) Process by UOP LLC
Hydrogen recovery and purification or rejection from various refining, petrochemical and chemical process gas streams. Other examples are: synthesis gas ratio adjustment and carbon monoxide (CO) recovery.
Feed: Refinery streams include: catalytic reformer offgas, hydrotreater and hydrocracker purge and
fluid catalytic cracking offgas. Chemical and petrochemical feed streams are: ethylene offgases, ammonia plant purges, methanol plant offgases, synthesis
gas streams from steam reforming, partial oxidation
or other gasification technologies.
Product: For typical hydrogen purification applications, recovery varies between 70% and 95+% and purity ranges from 70 to 99 mole%, depending on feed composition, pressure levels and product requirements. Polysep membrane systems are also designed to produce high-purity CO for petrochemical products such as polyurethanes and polycarbonates, and to ratio adjust synthesis gas streams in methanol and oxoalcohol plants. Also, a new application is hydrogen recovery from IGCC power generation systems.
The Polysep separation system is based on state-of-the-art, composite, hollow-fiber polymer membrane technology. The hollow fibers are packaged in a proprietary countercurrent-flow bundle configuration that maximizes the separation driving force and minimizes required membrane area.
The Polysep separation is a pressure-driven process. It requires a minimum of moving parts, utilities and operator attention. The systems are compact, shop-fabricated, modular units allowing reduced delivery schedules and simple inexpensive installation. Feed pretreatment equipment typically includes: a knockout drum for bulk liquid removal, a coalescing filter for particulate and entrained liquid removal, and a preheater to optimize the membranes’ performance.
Operation features include: automatic startup, capacity control, product-purity control, auto depressurization and turnup/turndown. Turndown capability is typically 30% using a patented control strategy. Membrane system control is typically via integration into the refinery’s control system. Once installed, a membrane system can reach steadystate operation from cold startup in a few hours with onstream factors over 99.8% relative to unplanned shutdowns.
Economics: Polysep membrane systems can be efficiently and economically scaled, from just a few modules
to over 100 modules, depending on the application. Membrane-separation systems have low capital costs and plot area, and offer a rapid return on investment.
Licensor: UOP LLC
Categories: Gas | Tags: Hydrogen | Comments Off on Hydrogen (Polysep membrane) Process by UOP LLC