110results about How to "Improve gas separation performance" patented technology

The invention belongs to the technical field of membranes and in particular relates to a porous material-polymer gas separation composite membrane. The composite membrane comprises a separation layer and a supporting layer, wherein a porous material-polymer hybrid membrane is adopted as the separation layer; one of a porous flat plate and a tubular or hollow fiber membrane is adopted as the supporting layer; the porous material of the separation layer is metal-organic frame materials (MOFs) with large specific surface area and high gas adsorption. The MOFs are added into the separation layer so that the gas permeation and selectivity of the membrane are obviously improved; the separation layer and the supporting layer are compounded so that the membrane keeps good mechanical property, and the separation layer is allowed to exist in a compact or asymmetric structure. The composite membrane provided by the invention has high gas separation property, good mechanical property and wide industrial application prospect.

The present invention relates to a method and apparatus for removing and recovering metal such as copper from various kinds of waste water containing copper. A method for treating waste water includes treating waste water in a copper treatment step (10) comprising a combination of electrodialysis operation and electrolytic deposition operation to produce treated water (107) having a lowered copper concentration, and recovering copper from the waste water.

Provided is an acidic gas separation module 10 which contains: a permeated gas collection tube 12 having through-hole 12As formed on the wall thereof; a layered body 14 in which a feed gas flow path member 30 through which an acidic gas-containing source gas is fed, an acidic gas separation layer 32 that contains a carrier reacting with the acidic gas and a hydrophilic compound supporting the carrier, and a permeated gas flow path member 36 through which the acid gas that has reacted with the carrier and permeated through the acidic gas separation layer 32 flows toward the through-hole 12As are layered; and heat/moisture-resistant adhesive parts 34 and 40 which adhere the both side edges of the acidic gas separation layer 32 and the permeated gas flow path member 36 along the circumferential direction in a state where the layered body 14 is wound in layers on the permeated gas collection tube 12, the adhesive parts 34 and 40 also adhering the circumferential direction edges of the acidic gas separation layer 32 and the permeated gas flow path member 36.

The invention discloses a supported composite carbon molecular sieve membrane. The supported composite carbon molecular sieve membrane is prepared by the following method: a. preparing a membrane-forming raw material: uniformly mixing a microporous material, a polymer material and a solvent; b. coating the surface of a carrier with the membrane-forming raw material prepared in the step a, and drying; and c. performing high-temperature carbonizing treatment. A certain metal element and a nitrogen-containing substance are introduced into the carbon molecular sieve membrane in a high-temperature pyrolysis process, so that permeability of the membrane is improved to a certain extent. The supported composite carbon molecular sieve membrane is high in preparation repeatability, and the prepared supported composite carbon molecular sieve membrane has excellent gas separation performance and has a wide application prospect in the field of gas separation.

Disclosed herein is a composite hollow fiber polymer membrane including a porous core layer and a selective sheath layer. The porous core layer includes a polyamide-imide polymer, or a polyetherimide polymer, and the selective sheath layer includes a polyimide polymer, which is prepared from monomers A, B, and C. The monomer A is a dianhydride of the formula

wherein X₁ and X₂ are independently halogenated alkyl group, phenyl or halogen and R₁, R₂, R₃, R₄, R₅, and R₆ are independently H, alkyl, or halogen. The monomer B is a diamino cyclic compound without a carboxylic acid functionality and the monomer C is a diamino cyclic compound with a carboxylic acid functionality. The polyimide polymer further includes covalent ester crosslinks. Also disclosed herein is a method of making the composite polymer membrane and a process for purifying natural gas utilizing the composite polymer membrane.

The present invention provides an asymmetric modified CMS hollow fiber membrane having improved gas separation performance properties and a process for preparing an asymmetric modified CMS hollow fiber membrane having improved gas separation performance properties. The process comprises treating a polymeric precursor fiber with a solution containing a modifying agent prior to pyrolysis. The concentration of the modifying agent in the solution may be selected in order to obtain an asymmetric modified CMS hollow fiber membrane having a desired combination of gas permeance and selectivity properties. The treated precursor fiber is then pyrolyzed to form an asymmetric modified CMS hollow fiber membrane having improved gas permeance.

The invention discloses a sulfonated poly(ether ether ketone)-sulfonated silicon dioxide microsphere hybrid membrane which consists of sulfonated poly(ether ether ketone)-sulfonated silicon dioxide microspheres. The preparation process comprises the following steps of performing reaction on silicon dioxide microspheres synthesized by a Stober method and 3-(methacryloyl) trimethoxypropylsilane to obtain double-key modified silicon dioxide microspheres; then preparing sulfonated silicon dioxide microspheres from the double-key modified silicon dioxide microspheres and vinyl benzene sulfonic acid sodium salt under the action of an initiator; co-blending the sulfonated silicon dioxide microspheres and a sulfonated poly(ether ether ketone) solution to obtain membrane casting liquid; and preparing the hybrid membrane by a casting method. The sulfonated poly(ether ether ketone)-sulfonated silicon dioxide microsphere hybrid membrane has the advantages that the raw materials are readily available; the preparation process is simple and controllable; the prepared sulfonated poly(ether ether ketone)-sulfonated silicon dioxide microsphere hybrid membrane applied to CO2/CH4 gas separation is relatively high in selectivity and permeability.

The invention relates to a macromolecule separation membrane technology, in particular to a method for preparing a CO2 separation membrane material and a composite membrane, comprising the following steps of: adding DM and PEGA to a tetrahydrofuran dissolvant, and then adding an initiator, wherein the total mass percent of the DM and the PEGA is 5-90 percent, and the mass percent of the initiator is 0.07-1 percent; then heating a 50-90 DEG C of oil bath for reflux; reacting for 10-30h; after the reaction, pouring into a stirring nonpolar dissolvant after the solution is cooled to the room temperature for settlement to obtain a white viscous polymer; and then baking for 20-30h in a vacuum baking oven at the temperature of 70-120 DEG C to obtain a light yellow transparent polymer PDM-PEGA. A composite plate prepared by the invention has good separating performance on CO1/CH4, CO2/Na and CO2/H2.

The invention discloses copolymers of intrinsic microporosity; the copolymers of intrinsic microporosity have the structure represented by the following formula described in the specification, wherein R is at least from substances represented by the following structural formulas, m and n are integers greater than or equal to 0 but are not 0 at the same time, and the ratio of n to m is (0-1) to (0-1). The copolymers are synthesized by a way of polycondensation with a Hitler alkali structure unit as a functional group. The copolymers have the characteristics of high specific surface area, high gas permeability rate, processable solvent and the like, and can be used for forming a test membrane material for a gas permeability rate test device; the membrane material has excellent gas separation performance, especially the separation performance of the oxygen/nitrogen gas pair is close to or beyond the Robeson upper limit updated in 2008, and the membrane material has wide prospect in industrial gas separation application.

The invention discloses an ultrathin zeolite imidazate skeleton hybrid membrane, a preparation method and application thereof. The hybrid membrane adopts ultrathin zeolite imidazate skeleton nanosheets to be dispersed into an organic solvent, a membrane is firstly formed on the surface of a carrier, and then a polymer membrane is formed on the membrane, so that the hybrid membrane is formed after 1 to 10 times of membrane formation. The ultrathin zeolite imidazate skeleton nanosheets in the zeolite imidazate skeleton hybrid membrane prepared in the invention and an organic polymer are of good interfacial compatibility, so that the hybrid membrane has extremely high gas separation performance. The hybrid membrane disclosed by the invention is simple in synthetic method and high in repeatability, and can be applied to various complex carriers.

The present invention is for crosslinked membranes and in particular for crosslinked poly(ethylene oxide)-cellulose acetate-silsesquioxane (PEO-CA-Si) organic-inorganic hybrid membranes and their use in gas separation. These crosslinked PEO-CA-Si membranes were prepared by in-situ sol-gel co-condensation of crosslinkable PEO-organotrialkoxysilane and CA-organotrialkoxysilane polymers in the presence of acetic acid catalyst during the formation of membranes. The crosslinkable PEO- and CA-organotrialkoxysilane polymers were synthesized via the reaction between the hydroxyl groups on PEO (or on CA) and the isocyanate on organotrialkoxysilane to form urethane linkages under mild conditions. The crosslinked PEO-CA-Si membranes exhibited both increased selectivity of CO₂/N₂ and CO₂ permeability as compared to a CA membrane, suggesting that these membranes are very promising for gas separations such as CO₂/N₂ separation.

[Problem] To provide a gas separation membrane which dissolves in an organic solvent, exhibits excellent formability, and exhibits excellent gas-separation performance when used as a gas separation membrane. [Solution] A gas separation membrane having a polyimide structure containing a repeating unit represented by general formula (1) (In the formula, R1 represents a bivalent organic group, and R2 represents a tetravalent organic group.), wherein R1 is a bivalent organic group represented by general formula (2) (In the formula, Raa represents a single bond, a sulfur atom, -SO2-, -CH2-, -C(=O)-, -C(CH3)2-, -C(CH3)(CH2CH3)- or -C(CF3)2-, or a bivalent organic group obtained by separating two arbitrary hydrogen atoms from a C3-12 alicyclic hydrocarbon compound or from a C6-25 aromatic hydrocarbon compound. Rab is a C1-6 alkyl group. ac and ad each independently represent an integer of 0-2. 1≤ac+ad≤4. HFIP represents a -C(CF3)2OH group. The line segments intersecting the wavy lines represent the locations of bonds.)

The invention relates to polymer separation membrane technology, in particular to a method for preparing a polyoxyethylene-introduced cross-linked modified polyimide gas separation membrane. The method comprises the steps of: 1) performing a cross-linking reaction, namely dissolving polyimide and a cross-linking agent, namely polyether amine into a solvent respectively until a polymer and the cross-linking agent are completely dissolved, mixing two solutions, and then stirring the obtained solution for 5 to 30h to react; and 2) preparing a homogeneous membrane, namely dumping the solution on a polyethylene plate after a complete mixed reaction of the solution, performing drying and film formation at the temperature of between 25 and 60 DEG C, placing the obtained homogeneous membrane into water for 1 to 5 days to remove the unreacted cross-linking agent in the homogeneous membrane, and then placing the membrane into a vacuum baking oven to bake at the temperature of between 50 and 120 DEG C for 5 to 24h, wherein the obtained membrane thickness is between 50 and 150mu m. The method uses the special cross-linking agent, namely the polyether amine to perform comprehensive cross-linking modification on the polyimide, and obtains the homogeneous membrane with excellent CO2 gas separation performance.

The invention discloses a facilitated transport membrane based on amino acid ionic liquid and a preparation method and application of the facilitated transport membrane. The facilitated transport membrane based on the amino acid ionic liquid is characterized by adopting a polyether-polyamide block copolymer as a membrane substrate, and 1-hexyl-3-methylimidazole glycinate is added into the membranesubstrate. The facilitated transport membrane has a simple preparation process, and due to 1-hexyl-3-methylimidazole glycinate which is contained in the facilitated transport membrane and provided with an amino group and a carboxyl functional group, the gas separation performance of the facilitated transport membrane can be improved.

The present invention relates to a polymeric hollow fiber membrane and a carbon molecular sieve hollow fiber membrane, both of which have excellent gas separation performance, and processes for preparing the same. Specifically, the present invention relates to a hybrid polymeric hollow fiber membrane that comprises a glassy polymer containing fluorine and a ladder-structured polysilsesquioxane, a hybrid carbon molecular sieve hollow fiber membrane prepared by pyrolysis thereof, and processes for preparing the same. The hybrid polymeric hollow fiber membrane and the hybrid carbon molecular sieve hollow fiber membrane according to the embodiments of the present invention are excellent in gas flux and selectivity and can have a large surface area per unit volume. Thus, they can be advantageously used for separating gases with a high energy efficiency on a large scale.

The method for producing a gas separation composite membrane includes applying a mixed liquid containing compounds (a) and (b) below onto a porous support to form a coating film and curing the coating film to form a crosslinked polysiloxane compound layer:

• • (a) a particular crosslinkable polysiloxane compound having a structural unit (a1), a structural unit (a2), and a structural unit (a3) or (a4), and
  • (b) a particular crosslinkable polysiloxane compound having a structural unit (b1), a structural unit (b2), and a structural unit (b3) or (b4),

where R^1a to R^1f and R^2a to R^2f represent a particular group and * represents a particular linking site.

The invention relates to a mixed matrix gas separation membrane material and a preparation method thereof. The mixed matrix gas separation membrane is composed of a metal-organic framework composite material and a polymer matrix, wherein a filler is an MOF-801\IL composite material with a three-dimensional structure, the polymer matrix is a microporous polymer PIM-1 with high permeability, and themass percent of the MOF-801\IL composite material with the microporous structure in the mixed matrix gas separation membrane material is 1-7%. The MOF-801\IL composite material has good affinity to CO2, and the three-dimensional porous structure of the MOF-801\IL composite material provides a selective rapid transportation channel for the passage of CO2. Meanwhile, the self-microporous polymer PIM-1 also has relatively good air permeability, and the two components are mixed to synergistically adjust gas permeability and selectivity, so the prepared novel PIM-1 mixed matrix gas separation membrane containing the MOF-801\IL composite material has relatively good gas permeability and separation performance, has good thermal stability and physical aging resistance, and has a wide applicationprospect.

The invention discloses a metal organic framework film with a polymer as a ligand. A reaction is carried out on film-forming raw materials obtained by mixing metal ions, polymer ligands and a solvent,and then the formed film is dried to obtain the metal organic framework film, wherein the film-forming raw material is a uniform mixture of the metal ions, the polymer ligands and the solvent. According to the metal organic framework film with the polymer as the ligand, the advantages of a conventional organic metal framework material and a polymer material are sufficiently combined. The metal organic framework film provided by the invention has high preparation repeatability, and the prepared product film has excellent gas separation performance, and has a wide application prospect in the field of gas separation.

A hollow fiber carbon membrane is produced by preparing a membrane-forming dope for carbon membranes by dissolving polyphenylene oxide in an amount giving a concentration of 15 to 40 wt. % in the membrane-forming dope, and sulfur in an amount giving a ratio of 0.2 to 3.0 wt. % based on the polyphenylene oxide, in a solvent capable of dissolving these components; preparing the membrane-forming dope for carbon membranes into a hollow shape by means of a spinning method in accordance with a non-solvent induced separation method using a double annular nozzle; performing a crosslinking treatment at 200 to 240° C. in the air; then performing an infusibilization treatment by heating at 250 to 350° C.; and further performing a carbonization treatment by heating at 450 to 850° C. in an inert atmosphere or under vacuum.