Figs 4 and 5 show that within the pressure range, pure PSU membrane presented a decreasing trend of permeance with increasing feed pressure
. Here in the Fig, the CO2 and CH4 permeance decreased from 7.40+-0.12 to 3.87+-0.2 GPU and 1.05+-0.05 to 0.34+-0.1 GPU with an increase in the pressure from 2 to 10 bar for pure PSU membrane.
Process data via DuPont's innovative, proprietary software, Wave, shows how the pre-treatment stage in the system minimizes membrane fouling, which in turn lowers required system feed pressure
and the need for frequent membrane cleanings.
Variable feed pressure
is applied through a motor/gearbox/chain combination providing 30,000-lb.
* Up to four units can share the same manifold and pneumatic connections, such as a common feed pressure
This company has introduced a robust new series of ID grippers with an 8-85mm diameter range and high holding force that can be adjusted to individual workpieces via feed pressure
. Color-coded to correspond with clamping positions for pushed and drawn parts and featuring strong elastomer bellows made of EPDM or silicone, the latter of which is FDA approved for direct contact with food, the new single-acting, pneumatically operated expansion grippers gently grip the inner contours of workpieces without leaving any marks, providing an effective alternative to suction cups and sprue grippers for parts with holes or recesses.
The system requires a minimum feed pressure
of 110 psi and can operate at pressures up to 140 psi.
Interestingly, PSf/Ti[O.sub.2] 3 wt% did not have C[H.sub.4] permeability at 1 bar feed pressure
. While, the amount of C[O.sub.2] permeance at same pressure for mentioned membrane was 0.26 GPU.
The reason to cool the screw this way is to prevent polymer from sticking to its surface until some feed pressure
is developed to "clean" the screw by conveying material forward.
The feed pressure
as well as other parameters such as operational temperature and properties of the membrane has significant effect on the performance of SWRO process.