Abstract:
A method of forming a two-layered membrane by immersion precipitation including: depositing a first hydrophilic polymer solution with a formulation optimized to produce a high performance porous layer; depositing on top of the first hydrophilic polymer solution a second, different hydrophilic polymer solution optimized to produce a high performance dense layer; and forming the two-layer polymer solution into one of a forward osmosis membrane and a pressure retarded osmosis membrane by bringing the second, different hydrophilic polymer solution into contact with water to form the dense layer. A two-layered membrane formed by immersion precipitation includes: a porous layer formed from a first hydrophilic polymer solution with a formulation optimized to produce a high performance porous layer; and a dense layer on top of and supported by the porous layer, the dense layer formed from a second, different hydrophilic polymer solution optimized to produce a high performance dense layer.
Abstract:
The present invention relates to a preparation method of a hollow fiber membrane for water treatment, wherein the hollow fiber membrane is prepared by preparing a spinning composition comprising a cellulose-based resin, a poor solvent, a plasticizer and an organic solvent, and spinning the spinning composition to a non-solvent. The present invention makes up for shortcomings of conventional preparation methods of a hollow fiber membrane, that is, can easily increase the physical properties of a separator for water treatment, shows easy reproducibility, and can provide a nanofilter (NF) and a reverse osmosis (RO) hollow fiber membrane for water treatment capable of obtaining high efficiency with a low cost.
Abstract:
The present invention generally relates to the field of water treatment, and in particular to industrial processes which generate aqueous solutions containing thiocyanate (SCN). The invention particularly relates to processes for treating aqueous solutions containing SCN and more specifically treatment processes to extract and remove SCN from said aqueous solutions.
Abstract:
Die Erfindung betrifft eine poröse, nicht partikuläre, konvektiv permeable Polysaccharidmatrix, auf deren Oberfläche ein aufgepfropftes Polymer aus mindestens einer ethylenischen Monomerverbindung mit funktionellen Gruppen fixiert ist, wobei die Polysaccharidmatrix durch Pfropfen einer porösen, nicht partikulären, konvektiv permeablen Polysaccharid-Ausgangsmatrix mit der mindestens einen ethylenischen Monomerverbindung in Anwesenheit einer organischen Säure mit mindestens einer Carbonsäuregruppe und/oder mindestens einer aciden XH-Gruppe mit X = -O, -S, oder -N und einer Übergangsmetall- oder Lanthanoidverbindung hergestellt ist. Die erfindungsgemäße Polysaccharidmatrix zeichnet sich durch eine hohe Proteinbindungskapazität aus. Weiterhin betrifft die Erfindung Verfahren zur Herstellung der Polysaccharidmatrix und eine Verwendung der Polysaccharidmatrix zur Stofftrennung.
Abstract translation:本发明涉及一种多孔的,非颗粒,其表面的至少一种烯属单体的接枝聚合物是固定的官能团上对流渗透多糖基质,其中通过接枝的多孔的,非粒状多糖基质中,对流渗透多糖与至少一种起始矩阵 在具有至少一个羧酸基团的有机酸的存在下烯属单体和/或具有XH X = O,S,或N和过渡金属或镧系元素化合物,制备至少一个酸性基团。 根据本发明的多糖的特征在于具有高蛋白质结合能力。 此外,本发明提供了制备该多糖基质和用于材料分离使用多糖而言方法。
Abstract:
This invention involves a composition, a method of making, and an application of high plasticization-resistant chemically cross-linked polymeric membranes such as cross-linked cellulose acetate (CA) membrane. These cross-linked polymeric membranes with covalently interpolymer-chain-connected rigid networks showed no decrease in CO 2 /CH 4 ideal selectivity under 690 kPa (100 psig) pure CO 2 pressure and also no CO 2 plasticization up to 3447 kPa (500 psig) pure CO 2 pressure. By using the method of chemical cross-linking as described in this invention, the separation characteristics of the polymeric membranes can be decisively improved. These new cross-linked polymeric membranes can be used not only for gas separations such as CO 2 /CH 4 and CO 2 /N 2 separations, O 2 /N 2 separation, olefin/paraffin separations (e.g. propylene/propane separation), iso/normal paraffins separations, but also for liquid separations such as pervaporation and desalination.
Abstract:
A method is provided for producing a high flux, high salt rejection cellulose acetate desalination membrane. In this method, cellulose acetate polymer is dissolved in a first solvent such as methylene chloride or 2-methyltetrahydrofuran to produce a solution. Further steps involve stirring the solution, and thereafter permitting the solution to settle, for a time sufficient for a majority of the cellulose acetate to precipitate out of the solution to form a cellulose acetate precipitate. Next, the cellulose acetate precipitate is stirred into an excess methanol. Thereafter, the cellulose acetate is filtered out and used in making the desalination membrane.