Hydrogen Separations in Syngas Processes
Syngas Ratio Adjustment
Syngas (H2 + CO) is required to make a variety of products.
Each of these syngas derivatives has a specific ratio of H2
to CO in the feed syngas that is optimal for its production. However,
the H2:CO ratio produced is a function of the syngas process
and the hydrocarbon feed. This ratio will not necessarily be optimal
for downstream products. Therefore, some method for reducing the amount
of hydrogen in the syngas is needed.
Syngas ratio adjustment using membranes
VaporSep-H2™ offers a simple method for separating H2
from syngas to adjust the H2:CO ratio. In a typical system,
the feed gas is first cooled to remove condensable hydrocarbons, and
then heated before entering the membrane. Hydrogen preferentially permeates
through the membrane, producing a purified hydrogen "permeate" stream
and a hydrogen-depleted "ratio-adjusted syngas" stream. This ratio adjustment
can even produce high-purity CO for processes requiring it as a feed.
This VaporSep-H2™ unit adjusts the syngas ratio in a GTL demonstration plant
- Efficient syngas and hydrogen recovery: membrane systems typically
recover 90% to 98% of feed CO and produce a hydrogen product at
85 to 95 vol% purity.
- Proven performance: many references for H2 /CO adjustment,
including pressures as high as 130 bar and operating lifetimes of
more than 10 years.
- Long membrane life
- Simple, reliable, and flexible unit; easy to install and operate:
- Integrates into existing operations with minimal modification
- Simple installation and operation with compact skid-mounted
- Requires no chemicals, contains no moving parts
- Minimal utility usage: low pressure steam, instrument air,
instrument power, N2
- H2 purification
- CO purification
- Syngas ratio adjustment for the following:
- Methanol, oxo alcohols
- Gas-to-liquids (GTL), power turbine
- H2 recovery from ammonia