Abstract:
The invention relates to a paste, which can undergo screen printing, for producing a porous polymer membrane. Said paste contains at least one polymer, one or more solvents for the polymer having a boiling point of > 100 DEG C, one or more non-solvents for the polymers (pore-forming agents) having a higher boiling point than that of the solvent(s), and contains a hydrophilic viscosity modifier.
Abstract:
A method for controlling the permeability of a substance to be separated through an organic membrane for separation, in a process of separating substances by the organic membrane, characterized in that it comprises irradiating the organic membrane with a high frequency wave, thereby causing vibration/rotation of a molecule or a domain of molecules constituting the membrane and thus changing the molecular structure and/or polarity of the membrane, to change the permeability of the substance to be separated through the membrane; and a method for producing an organic membrane for separation, characterized in that the permeability of the organic membrane is controlled through irradiating the membrane with a high frequency wave in a process of forming the membrane.
Abstract:
Semi-permeable membranes made from synthetic polymers are treated with a non-leaching antimicrobial agent to prevent bio-fouling and bacterial breakthrough. The semi-permeable membranes include a polymeric material and a non-leaching antimicrobial agent that is incorporated into and homogeneously distributed throughout the polymeric material. In one embodiment, the polymeric material is cellulose acetate. In another embodiment, which utilizes thin film composite polyamide membranes (10), the antimicrobial agent is incorporated in a microporous polysulfone layer (14) that is sandwiched between a reinforcing fabric (16) and an ultrathin polyamide material (12). The invention also includes a treatment of flat and hollow fiber semi-permeable membranes made with polysulfones and polyvinylidene fluoride. The membranes may be used in reverse osmosis, ultrafiltration, and microfiltration applications.
Abstract:
A cellulose acetate semipermeable membrane which exhibits a high filtration velocity, has a high mechanical strength and is unsusceptible to degradation by a microorganism, characterized in that it comprises a cellulose acetate having an alpha -cellulose content of 99 wt.% or more, a 6 wt/vol % viscosity at 25 +/- 1 DEG C of 20 to 220 mPa.s and an acetylation degree of 58 to 62 %. This cellulose acetate semipermeable membrane is particularly suitable for a hollow yarn membrane.
Abstract:
An absorbent article comprising a cellulosic membrane about 5 to 50 $(g)mm thick prepared by casting a film from solution of a cellulose derivative in a suitable solution and these formed into a packet which encapsulates an osmotic promoter, particularly sodium chloride, sugar or other suitable compound, peferably having a molecular weight below about 500. The packet is capable of tacking up at least 0.001 g/cm2/min of water and retaining it against an external pressure of at least 0.689 kPa.
Abstract:
Embodiments of the present disclosure describe a method of making a membrane comprising contacting one or more membrane materials, a solvent, and a non-solvent at a first temperature sufficient to form a homogenous solution; casting the homogenous solution at about the first temperature; and adjusting the temperature to a second temperature sufficient to induce phase separation of the solvent and non-solvent and form a porous membrane. Embodiments of the present disclosure also describe a mask for removing particulate matters.
Abstract:
The present invention relates to a brine mining process. The process incorporates a forward osmosis step wherein at least a portion of at least one process stream is provided to at least one forward osmosis unit. The process thus allows for the use of multiple sources, and qualities, of water, which, in turn, can reduce the reliance on natural water sources. Longevity of the mining, and any downstream, process equipment may be enhanced. At least a portion of the production stream may also be fed to a downstream process, such as a chlor-alkali process.