39results about How to "Improve selective separation performance" patented technology

The invention discloses a method for separating ginkgolide B from a ginkgolide mixture. The method comprises the following steps: by using an ionic liquid or a binary mixed solvent composed of ionic liquid and water as the extracting agent, and efficiently separating ginkgolide B from a mixture, which contains ginkgolide A, ginkgolide B, ginkgolide C and other ginkgolide homologues, through a fractional extraction process. The method has the advantages that the method has high separation efficiency, low solvent consumption, high safety, environmental protection and the like and is suitable for industrial production, etc.

The invention provides a PEBA (Polyether block amide) composite film as well as a preparation method and application thereof. The PEBA composite film comprises a base film, a PEBA separation layer and a transition layer, wherein the transition layer is used for connecting the base film and the PEBA separation layer, and comprises hydrophilic silicone oil. The invention further discloses the preparation method for the PEBA composite film. The method comprises the step of sequentially coating a transition layer solution and a PEBA solution on the base film. The PEBA composite film provided by the invention has relatively high permeability and relatively high selectivity. The preparation method of the PEBA composite film is simple and easy to control, can be used for the gas separation and pervaporation process, and has wide application prospect.

The invention discloses a method for preparing an oxidizing carbon nitride two-dimensional material composite film. The method comprises the following steps of (1) oxidizing the carbon nitride to obtain oxidizing carbon nitride, dispersing the oxidizing carbon nitride into a solvent, stripping into a flaky shape by ultrasonic waves, and forming oxidizing carbon nitride dispersion liquid; (2) mixing the oxidizing carbon nitride dispersion liquid and macromolecular film forming liquid to form composite film liquid; (3) forming the oxidizing carbon nitride two-dimensional material composite film at the surface of a porous carrier by an impregnating-drying method. The method for preparing the oxidizing carbon nitride two-dimensional material composite film has the advantages that the composite film with adjustable thickness and high mechanical strength can be prepared, and the good selection and separation effects are realized in the field of gas separation.

A composite hollow fibre membrane based on the composite resistance Henis membrane model (silica rubber/polysulfone membrane) for separating H2 or N2 with high effect is composed of basic membrane, water-soluble high-molecular layer in rubber state at ordinary temp and silica rubber layer. It can be used for the ammonia synthesizing plant or oil refinary to recover N2 or H2. Its preparing process is also disclosed.

The invention discloses a method for separating vitamin D3 from tachysterol T3. According to the method, high-purity vitamin D3 and tachysterol T3 are efficiently separated from a mixture containing the vitamin D3 and the tachysterol T3 by a fractional extraction method, wherein a medium polar to polar organic solvent, ionic liquid or a binary mixed solvent consisting of the ionic liquid and the medium polar to polar organic solvent serves as an extracting agent. The method has the advantages of high separation efficiency, low solvent consumption, high yield, safety, environmental friendliness, easiness in industrialized production and the like.

The invention discloses a method for preparing a modified anion exchange membrane with both monovalent selectivity and antibacterial properties. The method comprises the following steps: (1) sequentially carrying out acid washing, alkali washing and water washing on a commercial anion exchange membrane, and removing surface impurities to obtain a pretreated base membrane; (2) forming a uniform poly-dopamine layer on the surface of one side of the pretreated base membrane to obtain an anion exchange membrane with the poly-dopamine layer; (3) carrying out in-situ reduction on silver ions on theanion exchange membrane with the poly-dopamine layer to obtain an anion exchange membrane with nano silver granules and the poly-dopamine layer; (4) dissolving 2,5-diaminobenzene sulfonic acid into aTris buffer solution of which the pH value is 8.5-8.8; (5) soaking the anion exchange membrane with the nano silver granules and the poly-dopamine layer in the 2,5-diaminobenzene sulfonic acid Tris mixed solution, and exposing the nano silver granules and the poly-dopamine layer in ultraviolet lighting to react for 12-24 hours, and grafting the membrane surface with the 2,5-diaminobenzene sulfonicacid to obtain the modified anion exchange membrane.

The invention discloses a multi-purpose separation medium and a preparation method thereof, wherein, tetrazole is the functional group of the medium. More particularly, a separation medium with novel structure is prepared by linking the tetrazole on the surface of silica gel, dextran and agarose gel separation group. The invention has dual purposes of being applied to ion-exchange chromatography and metal chelate chromatography. When the medium is applied to the ion-exchange separation of proteins, the separation of proteins is highly selective, easy to regenerate and quick to separate and both the quality and recovery rate of the activity of the proteins are high. When the medium is applied to the metal chelate chromatography of proteins, the separation of proteins is highly selective, small in metal ion loss and quick to separate and both the quality and recovery rate of activity of the proteins are high. The invention can be applied to the quick separation and purification of genetic engineering products and plasma proteins.

The invention discloses a method for separating cholesteryl ester from lanolin. The method comprises the following steps of: (1) taking lanolin as a raw material, and preparing a raw material liquid from the lanolin and a hydrophobic organic solvent; carrying out fractional extraction by taking one or more than two mixed solvents from moderate polar or polar organic solvents as extracting agents and a solvent which is the same as the raw material liquid solvent as a washing agent to obtain extraction liquid; and (2) carrying out vacuum concentration, washing with water and drying to obtain the cholesteryl ester. In the method, the organic solvents which are frequently-used in the industry are adopted, and the cholesteryl ester with a higher content can be efficiently separated from the lanolin, so the method has the advantages of high separation efficiency, less solvent consumption, high productivity, low cost, safety, environmental protection, easy industrial production, and the like.

The invention provides a preparation method of a sandwich-shaped heterostructured MOF crystal material having multiple amino functional groups and application of the sandwich-shaped heterostructuredMOF crystal material having multiple amino functional groups to separation of C2H2/CH4 mixed gas. The preparation method of the MOF crystal material is characterized by comprises the following steps:firstly, synthesizing an MOF crystal A through a hydrothermal method; and removing high-boiling-point solvent molecules in the pores of the crystal A through solvent exchange and vacuumizing; with thecrystal A as a seed crystal, growing a heterostructure MOF crystal B having a sandwich shape and multiple amino functional groups on the surface of the seed crystal A through a hydrothermal synthesismethod; and conducting separation through penetration experiments, and performing vacuum activation at 30 DEG C so as to obtain the sandwich-shaped heterostructured MOF crystal material having multiple amino functional group. The separation factor of the sandwich-shaped heterostructure MOF crystal material having multiple amino functional groups on C2H2/CH4/He (wherein a v/v/v ratio is 15: 15: 70, and the total flow of mixed gas is 6 ml/min) reaches 6.54, so the material is a solid adsorption material for efficiently separating C2H2 and CH4.

The invention discloses a preparation method of a self-supporting composite nanofiltration membrane, which comprises the following steps: by taking aminated graphene quantum dots as a main body, preparing a porous graphene-based two-dimensional sheet material through interfacial polymerization reaction between the aminated graphene quantum dots and multi-element acyl chloride; and then in-situ packaging the porous graphene-based two-dimensional sheet material by using polyamide through an in-situ packaging technology to prepare the self-supporting porous graphene/polyamide separation layer with excellent permeability and high selectivity. The self-supporting composite nanofiltration membrane prepared by the method overcomes the Trade-off effect of a traditional polymer membrane material, shows excellent permeation flux, separation performance and dye desalting capacity, has excellent strong alkali resistance and long-term operation stability, obviously prolongs the service life of the membrane, and is suitable for industrial production. The method has good practical value in the fields of industrial wastewater treatment, dye desalination, chemical separation and the like.