Abstract:
The present invention the manufacture of a membrane for gas and liquid separations in which a polymer layer is applied directly to a tricot fabric instead of the conventional cloth or glass or metal substrate.
Abstract:
A plant watering device (10) is disclosed. The device (10) has a preferentially water permeable membrane (12) arranged to separate a supply of water (22) from a root system (24) of a plant. The membrane is arranged to allow water (22) to permeate to water the roots (24).
Abstract:
The present invention proposes a new formulation for the making of a cellulose acetate hollow fiber membrane for ultrafiltration with high water permeability, capable of oil and water separation with minimal energy consumption and low fouling tendencies.
Abstract:
A process of making medical devices (10) from cellulose acetate semipermeable membranes. The medical device (10) includes a first blood port (12), a second blood port (14), a first dialysate port (16) and a second dialysate port (18).
Abstract:
A cellulosic ultrafiltration membrane is provided having a microporous base resistant substrate and an ultrafiltration layer form of a cellulose ester or cellulose.
Abstract:
Semipermeable membranes are disclosed for purifying aqueous biological fluids. The membranes are particularly suitable for purifying extracorporeal blood via hemodialysis. The membranes, preferably configured as hollow fibers, are made from a hydrophilic polymeric material, preferably cellulose acetate. Features of the membranes include an ultrafiltration coefficient (KuF) of about 15 to about 55 mL/hr/mmHg/m (thus termed "high-flux" type membranes), a urea mass transfer coefficient (KoV (urea)) of at least 38 x 10 cm/min, and a ratio of KoV(urea)/KuF of at least 2.5 x 10 . Hollow fibers of such membranes suitable for hemodialysis have a lumen diameter of about 175 to about 210 mu m and a wall thickness of about 10 to about 35 mu m. According to disclosed methods for making the membranes, a melt comprising about 32 to about 40 % w/w cellulose acetate, about 5 to about 10 % w/w glycerine, and about 50 to about 65 % w/w polyethylene glycol is extruded to make hollow fibers; the fibers are cooled, cold-stretched, water-leached, and replasticized using a glycerine solution.
Abstract:
A membrane permeation system and process accommodates varying acid gas inlet concentrations over time while utilizing only the initially installed equipment and still maintaining the non-permeate gas specification. The system and process provide flexibility to operate efficiently over a wide range of inlet CO 2 concentrations by adjustments to primary permeate, secondary permeate, and recycle gas operations. The glassy polymer membrane devices used in the system and process are selected so removal duty efficiency increases as acid gas concentration increase. Designing the system and process to handle about a 15% increase in acid gas concentrations over initial conditions effectively treats acid gas concentrations well above that 15% increase, thereby eliminating the need for additional equipment or for additional downstream amines and physical solvents.
Abstract:
A method for conditioning natural gas into fuel gas, where the method includes the step of: delivering a natural gas stream including both CO 2 and C2+ hydrocarbons to a membrane separation assembly; and separating the natural gas stream into the following streams: (i) a first permeate stream, (ii) a second permeate stream, and (iii) a residual stream. The first permeate stream includes CO 2 removed from the natural gas stream. The second permeate stream includes methane at a greater concentration than a concentration of methane in the natural gas stream. The residual stream contains C2+ hydrocarbons at a greater concentration than a concentration of C2+ hydrocarbons in the natural gas stream.