88results about "Membrane purification/separation" patented technology

A gas separation system for producing a CH4-enriched gas from a feedstock gas containing CO2 and CH4, including a first gas separation membrane unit and a second gas separation membrane unit, in which the gas separation system includes a feedstock gas supply line connected to a gas inlet of the first gas separation membrane unit; a compression part disposed in the feedstock gas supply line; a first line connecting the retentate gas outlet of the first gas separation membrane unit and the gas inlet of the second gas separation membrane unit; a second line connecting the permeate gas outlet of the second gas separation membrane unit and the feedstock gas supply line; and a cooling part for lowering the operating temperature of the second gas separation membrane unit below the operating temperature of the first gas separation membrane unit.

A porous cylindrical support for use in supporting a zeolite membrane has a generally cylindrical inside surface having a central axis extending in the longitudinal direction and a generally cylindrical outside surface that surrounds the inside surface. A zeolite membrane is formed on the outside surface. A maximum value A and a minimum value B of a support thickness in a circumferential direction satisfy (A−B) / (A+B)≤0.3 in at least part of the support in the longitudinal direction, the support thickness being a radial distance between the inside surface and the outside surface. By reducing a variation in support thickness, it is possible to improve uniformity in the thickness of the zeolite membrane formed on the support.

The invention provides a method for recovering tail gas generated in production of carbon nanotubes. The method comprises the following steps: compression: introducing tail gas containing methane and hydrogen into a compressor for pressurization; first-stage separation: the pressurized tail gas is introduced into a first-stage membrane separator for separation, methane and first-stage tail gas are obtained, and the main component of the first-stage tail gas is hydrogen; and second-stage separation: introducing the first-stage tail gas into a second-stage membrane separator for separation to obtain hydrogen and second-stage tail gas containing hydrogen. Through two-stage membrane separation, methane and hydrogen are recovered, the methane separated in the first stage can return to the continuous furnace to be continuously used as a raw material for producing carbon nanotubes, and the hydrogen separated in the second stage can be used for producing trichlorosilane, so that the recovery and utilization of resources can be realized.

The invention relates to the technical field of aromatic hydrocarbon separation and purification, in particular to a system and process flow for removing C8 non-aromatic hydrocarbon in xylene through membrane separation, and the system comprises a membrane separation unit, a feeding unit, a permeation side system, an interception side system, an adsorption tower feeding buffer tank outlet line and a crossover line; the membrane separation unit is provided with a membrane feeding pipeline, one end of the membrane separation unit is connected to an outlet of the membrane separation feeding buffer tank, and the other end of the membrane separation unit is connected to an inlet side pipe orifice of the separation pipeline; a membrane feeding booster pump is arranged on the membrane feeding pipeline; a spiral-wound membrane assembly is arranged in the separation pipeline; the feeding unit is provided with a xylene redistillation tower top outlet line which is connected to an inlet of the membrane separation feeding buffer tank from the xylene redistillation tower top. According to the membrane separation process adopted by the method, the non-aromatic hydrocarbon removal rate can be more than 98% under the operation conditions that the feeding pressure is 1.68 MPa, the permeation side is 20 kPa and the interception side is 1.6 MPa, and the method has definite industrial feasibility and technical advantages.

Example gas recovery systems include a source gas conditioning assembly configured to condition and compress the inlet source gas to provide a conditioned source gas, a first membrane assembly configured to separate the conditioned source gas into a hydrocarbon enriched stream and a recovery stream, a second membrane assembly fluidly coupled to the hydrocarbon enriched stream, and configured to separate the hydrocarbon enriched stream into a hydrocarbon product stream and a recycle stream, a carbon dioxide (CO2) plant assembly fluidly coupled to the recovery stream configured to provide a carbon dioxide product stream and an enriched recycle stream, a standalone membrane assembly configured to separate the enriched recycle stream into a hydrocarbon enriched recycle stream and an effluent stream, and wherein the source gas conditioning assembly is fluidly coupled to the recycle stream and the hydrocarbon enriched recycle stream.

The invention provides a carbon molecular sieve gas separation membrane prepared based on Joule heating and a preparation method and application thereof. According to the preparation method, 6FDA-DAM polyimide is used as a precursor material, an aprotic polar solvent is used as a solvent, a compact precursor film is prepared through a solvent evaporation method, and carbonization treatment is carried out in a vacuum environment in a Joule heating mode. By controlling the carbonization duration, the microporous structure in the membrane, the formation of an ordered carbon skeleton and the removal degree of functional groups can be adjusted, the conversion from surface diffusion to a molecular sieve screening mechanism is realized, and the gas separation capacity is remarkably improved.

Provided is a method for upgrading a bio-based material, the method including the steps of pre-treating bio-renewable oil(s) and / or fat(s) to provide a bio-based fresh feed material, hydrotreating the bio-based fresh feed material, followed by separation, to provide a bio-propane composition.

This invention relates to a sealing structure and its preparation method for a high-pressure, corrosion-resistant acetylene purification membrane module, belonging to the field of gas separation technology. The sealing structure includes: a membrane element support cylinder; an end clamping assembly comprising a limiting step and a pressure equalizing gasket; a double-layer sealing ring consisting of a main sealing ring and an isolation sealing ring, forming an annular isolation cavity between them; and a leakage guide channel connecting the isolation cavity to an external safety collection port. When a micro-leakage occurs in the main seal, the medium enters the isolation cavity and is discharged to the safety collection end through the guide channel, preventing external leakage. The main sealing ring is made of a pressure-resistant, low-permeability material, and the isolation sealing ring is made of a chemically corrosion-resistant material. The preparation method includes precision machining of the sealing groove, sealing ring forming and secondary vulcanization, staged clamping assembly, and leakage testing. This invention transforms micro-leakage into a controllable state, employs a modular design to adapt to different membrane area configurations, and provides a safe and reliable sealing solution for acetylene membrane separation and purification.

The invention relates to a high-purity ethylene production method and system. The production method comprises the following steps: S1, gasifying: pressurizing an industrial ethylene raw material and gasifying; s2, primary adsorption and purification: feeding the gasified industrial ethylene raw material gas into a primary adsorber for primary purification, and removing H2O, C2H2, CO2 and hydrocarbon impurities above C3 from the raw material gas through the primary adsorber; s3, secondary adsorption and purification: introducing the primarily purified ethylene gas subjected to primary adsorption and purification into a secondary adsorber, and carrying out adsorption-expansion desorption to obtain quasi-high-purity ethylene; s4, entering a multi-stage membrane filtration unit: enabling the quasi-high-purity ethylene subjected to secondary adsorption purification to sequentially penetrate through a plurality of membranes loaded with metal ions, so as to obtain high-purity ethylene; the metal ions are one or a mixture of more of silver ions, cobalt ions, copper ions and titanium ions. Compared with the prior art, the method provided by the invention has the advantages of short flow, low energy consumption, good separation effect, strong process continuity, high product purity and low impurity content, and can meet the production of high-purity ethylene above G5 requirements.

The present invention relates to a method for recovering byproducts of substituted aromatics oxidation reactions, the method comprising cooling one or more of a gaseous stream directed to a high-pressure absorber (380), a solvent-rich wash stream (381) directed to the high-pressure absorber, and a water-rich liquid stream (383) directed to a solvent recovery zone by heat exchange with cooled waste wash liquid taken from a low-pressure scrubber (430).

In some embodiments, a system, and at least one method relating thereto, comprises a temperature swing adsorption (TSA) vessel comprising: an inlet and an outlet configured to provide a fluid flow through the TSA vessel; and a TSA media disposed within the TSA vessel, wherein the TSA media comprises: a first layer comprising a first material; a second layer comprising a second material configured to remove water from the fluid flow, wherein the second layer is downstream of the first layer with respect to the fluid flow; and a third layer comprising a third material configured to remove one or more hydrocarbons, volatile organic compounds (VOCs), or a combination thereof, from the fluid flow, wherein the third layer is downstream of the second layer with respect to the fluid flow.

The invention relates to a carbon dioxide separation membrane as well as a preparation method and application thereof. The carbon dioxide separation membrane is prepared from cucurbit [7] uril CB [7] and a dual-network hydrogel polymer matrix, the dual-network hydrogel polymer matrix is formed by carrying out ultraviolet polymerization on a first network monomer and a second network monomer; the first network monomer is 2-acrylamide-2-methyl propane sulfonic acid (AMPS); and the second network monomer is N, N-dimethylacrylamide DMAAm (N, N-dimethylacrylamide). The CB [7] inherent nanopore channel and an additional channel formed by the CB [7] and a polymer chain interface cooperatively construct an efficient CO2 transmission path, and meanwhile, the CO2 permeability and CO2 / CH4 selectivity of the membrane are improved; the separation membrane is simple in preparation method and stable in performance, and has a wide application prospect in the field of carbon dioxide separation such as biogas upgrading.

Methods and systems or devices for synthesis of valuable chemicals from carbon dioxide and hydrogen are provided. A high surface area hollow fiber catalytic membrane reactor such as with hollow fibers coated with a water permeable membrane material is used. The reactor also contains methanol synthesis component, and as needed, a dehydration catalyst component such that the two-step reaction takes place on the catalyst surface. Produced water permeates through the membrane, exiting the reactor immediately after it is formed. Unreacted reactants and products flow to the reactor exit. The valuable chemicals can be liquefied petroleum gas (LPG), dimethyl either (DME), methanol, ethanol, olefin, jet fuel or a combination thereof.

The invention discloses a method for synthesizing a hierarchical pore MFI molecular sieve membrane based on a sacrificial crystal seed layer, and belongs to the field of zeolite molecular sieve membrane synthesis. The hierarchical pore MFI molecular sieve membrane with a compact selective top layer and a macroporous transition layer with high porosity is successfully constructed on a porous carrier through a surface wet gel secondary growth technology of a sacrificial crystal seed layer. The film layer structure and the gas separation performance are optimized by regulating and controlling the composition, the aging time and the crystallization time of the synthetic gel. The prepared hierarchical pore MFI molecular sieve membrane shows high permeability and excellent selectivity in n-butane / iso-butane separation, and the preparation process is good in repeatability, high in stability and suitable for industrial gas separation application.

The application provides an ethylene device cracking gas separation system and a separation method. The separation system comprises a multistage cryogenic unit, a first separation tank, a heat exchanger, a first membrane separation unit, a first compressor, a second membrane separation unit, a second compressor, a multistage series separation tank, a third membrane separation unit and a cryogenic demethanizer. The application separates most of the hydrogen in the ethylene device cracking gas through the multistage membrane separation unit, thereby increasing the partial pressure of ethylene in the condensation process, and further reducing the refrigeration load in the ultra-low temperature zone.

The present disclosure is directed to 1,3-butadiene extraction and steam cracking recovery systems, more particularly, to systems and methods for removing tar from the solvent loop of such systems using a membrane.

In some embodiments, a system, and at least one method relating thereto, comprises a temperature swing adsorption (TSA) vessel comprising: an inlet and an outlet configured to provide a fluid flow through the TSA vessel; and a TSA media disposed within the TSA vessel, wherein the TSA media comprises: a first layer comprising a first material; a second layer comprising a second material configured to remove water from the fluid flow, wherein the second layer is downstream of the first layer with respect to the fluid flow; and a third layer comprising a third material configured to remove one or more hydrocarbons, volatile organic compounds (VOCs), or a combination thereof, from the fluid flow, wherein the third layer is downstream of the second layer with respect to the fluid flow.

A gas separation method including performing a gas separation operation that separates a source gas into a primary-side gas and a secondary-side gas with a membrane of a membrane module. The source gas contains a combustible component. The gas separation operation includes pressurizing the source gas and supplying the source gas to a primary side of the membrane module and depressurizing a secondary side of the membrane module to a pressure lower than an atmospheric pressure. The primary-side gas has a higher concentration of the combustible component than the secondary-side gas, and the gas separation method further includes detecting a composition of the secondary-side gas and stopping the gas separation operation in an instance in which the composition enters a specified range.

The invention discloses a silicon network cross-linked polyether block polyamide pervaporation membrane as well as preparation and application thereof. The preparation method comprises the following steps: firstly preparing an n-butyl alcohol solution of Pebax, then adding siloxane and an alkali solution, carrying out solution crosslinking to obtain a crosslinked Pebax membrane casting solution, spin-coating the surface of a dried polysulfone ultrafiltration membrane with the crosslinked Pebax membrane casting solution, and drying to obtain the silicon network crosslinked polyether block polyamide pervaporation membrane. The preparation method disclosed by the invention is simple, the Pebax membrane which performs silicon network crosslinking through a one-pot method has the characteristics of short operation flow and high controllability, and the prepared silicon network crosslinked polyether block polyamide pervaporation membrane has relatively high permeability and selectivity and has relatively high adaptability to different feed concentrations.

The invention discloses an inert solvent recovery method for a solid acid catalysis heat-sensitive spice esterification system, and belongs to the technical field of fine chemical engineering, and the method comprises the following steps: carrying out degassing and / or deoxidation pretreatment on a material containing heat-sensitive spice ester and an inert solvent, and removing phase-separable free water; feeding the pretreated material into a membrane evaporator to remove the inert solvent, and operating at a certain evaporation surface temperature to obtain an ester-containing concentrated solution and solvent steam; enabling the solvent steam to sequentially pass through a neutralization condensation section to remove acidic water vapor, and then condensing and collecting to obtain a recovered inert solvent; polishing and purifying the recovered inert solvent; when the recovered inert solvent reaches a preset re-feeding index, re-feeding the recovered inert solvent to the next batch of esterification reaction, continuously polishing the non-standard solvent, and re-checking the non-standard solvent; the ester-containing concentrate is cooled or added with an antioxidant inhibitor after exiting the evaporation surface to terminate the thermal / oxidation process. According to the method, efficient closed-loop recovery of the solvent is realized, and high-temperature degradation, impurity accumulation and energy waste are avoided.

The invention relates to a membrane material, in particular to a method for separating carbon dioxide / acetylene by using a modified CHA molecular sieve membrane. The invention provides a method for separating carbon dioxide / acetylene by using a modified CHA molecular sieve membrane, which comprises the following steps: introducing a mixed gas containing carbon dioxide and acetylene into a molecular sieve membrane assembly, thereby obtaining a carbon dioxide-rich gas on the permeation side of the molecular sieve membrane assembly, and obtaining an acetylene-rich gas on the retentate side of the molecular sieve membrane assembly, the molecular sieve membrane assembly is filled with a modified CHA molecular sieve membrane, the modified CHA molecular sieve membrane constructs an oriented screening confinement pore channel with positive electricity in a membrane layer, and separation of two molecules is realized by utilizing opposite electrostatic potentials of carbon dioxide and acetylene.

The invention belongs to the technical field of new materials, and particularly relates to a pyrazolyl framework material as well as a preparation method and application thereof. The ligand is 4, 4 '-(2, 2'-bis (trifluoromethyl)-[1, 1 '-biphenyl]-4, 4'-diyl)-bis (1H-pyrazole), the crystal structure of the ligand belongs to a P21 / c space group of a monoclinic system, and the cell parameters of the ligand are as follows: the axial length a is 9.0797 (2), the b is 19.7923 (4), the c is 90.0 (10), the axial angle alpha is equal to gamma and is 90 degrees, the beta is equal to 92.196 (2) degrees, the cell volume is 5695.9 (2) 3, and the Z is 12. Two zinc-based complexes are synthesized based on the ligand and the same series of ligands 4, 4 '-(2, 2'-dimethyl-[1, 1 '-biphenyl]-4, 4'-diyl)-di (1H-pyrazole), the structure of the zinc-based complexes 1 belongs to a tetragonal system and an I41 / a space group, and the cell parameters of the zinc-based complexes 1 are that the axial length a = b = 34.8953 (6), the c = 13.4293 (6), the axial angle alpha = beta = gamma = 90 degrees, the cell volume is 16352.6 (7) 3, and Z = 228. The series of zinc-based complexes can be applied to the field of butane isomer gas separation.

The invention relates to a functionalized polydopamine modified mixed matrix membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly immersing a mixed matrix membrane into a dopamine solution, then immersing the mixed matrix membrane into a modifier solution for improving hydrophobicity, performing ultrasonic reaction and vacuum drying during immersion, and coating the surface of the mixed matrix membrane with modified polydopamine; the modifying agent is selected from one or more of 1H, 1H, 2H, 2H-perfluorodecyl triethoxy silane, 1H, 1H, 2H, 2H-perfluorodecyl trichlorosilane and 1-dodecanethiol, and the modifying agent is selected from one or more of 1H, 1H, 2H, 2H-perfluorodecyl triethoxy silane, 1H, 1H, 2H, 2H-perfluorodecyl trichlorosilane and 1-dodecanethiol. Compared with the prior art, the selectivity and stability of the membrane are improved, and the problems of stability and treatment efficiency of the mixed matrix membrane in the separation process are effectively solved.

The present invention provides a method for separation and recovery of boron trifluoride and complexes thereof in an olefin polymerization reaction. The method for separation and recovery of boron trifluoride and complexes thereof in an olefin polymerization reaction, comprising: 1) subjecting a mixture obtained after an olefin polymerization reaction to flash distillation separation to separate part of gaseous boron trifluoride; 2) subjecting the liquid phase obtained from the flash distillation separation to membrane separation to obtain complexes of boron trifluoride and a crude product of the olefin polymerization reaction; and 3) subjecting the crude product of the olefin polymerization reaction obtained in step 2) to gas stripping separation to separate the remaining gaseous boron trifluoride, so as to obtain a pure product of the olefin polymerization reaction The present invention designs a matching process based on the polymorphic characteristics of boron trifluoride and complexes thereof to achieve efficient separation of boron trifluoride and complexes thereof from polymerization intermediates.

The present disclosure provides systems and methods for separating olefins from paraffins. The systems and methods may include enriching olefins from a feedstock comprising olefins and paraffins using a distillation column. The present disclosure also provides systems and methods for producing polyolefins, which may include separating unreacted olefins from a reactor discharge stream using a facilitated transport membrane. Among other advantages, the systems and methods described herein can also increase the overall polyolefin production of a plant, produce paraffin-rich products, reduce energy requirements and greenhouse gas emissions associated with a split-flow column, and convert the energy combination for separation to electrical energy.

The invention relates to a preparation method and application of a composite membrane based on a basalt-aluminum oxide ceramic supporting layer. The composite membrane is composed of a basalt-alumina supporting layer, a poly (3, 4-ethylenedioxythiophene): poly (styrene sulfonate) drainage ditch layer and a polyethersulfone-metal organic framework separation layer, and basalt powder and alumina powder are mixed, pressed, sintered and subjected to plasma treatment to prepare the supporting layer with micro-pore diameter and high mechanical strength. And sequentially depositing a drainage ditch layer and a separation layer on the support layer to prepare the basalt-alumina ceramic support layer composite membrane with high mechanical strength, high porosity and high selectivity. The basalt-alumina ceramic support layer composite membrane prepared by the method not only simplifies the membrane manufacturing process, but also expands the application of the ceramic support body in gas separation. The problems that a traditional supporting layer is complex in process, high in cost, limited in performance and the like are effectively solved, and new high-performance supporting layer material selection is provided for the gas separation technology.

Process for Valorizing Effluents from a CVI Process The invention relates to a process for recycling effluents (10) from a chemical vapor infiltration process comprising at least the following steps: - a step (E1) for separating the effluent gases from a chemical vapor infiltration process, allowing these effluents to be separated into a heavy portion (101) and a light portion (201); - a step (E2) for reforming the heavy portion (201) obtained at the end of the separation step, the reforming step being carried out under thermodynamically favorable conditions for obtaining unsaturated hydrocarbons comprising chains with two carbon atoms; - a step (E3) for hydrogenating the products obtained at the end of the reforming step; and then - a step for reintroducing the transformed effluents (104) into a vessel intended for carrying out a chemical vapor infiltration process (E5). Figure for the abstract: Fig. 1.

A method for recovering high-purity naphthalene from a Rerun Column bottom residue is disclosed. The process begins with collecting the residue and dividing it into two portions. One portion is maintained at room temperature, while the second is cooled to approximately 16° C. to initiate the selective solidification of naphthalene. Upon gradual warming of the cooled portion to ambient temperature over 3-4 hours, a clear separation between solid naphthalene and the liquid residue is achieved. The liquid layer is decanted, and the remaining solid fraction is filtered using Whatman-1 filter paper with tissue paper to absorb residual liquids. The recovered crystals are washed 3-4 times with water to eliminate impurities and dried in a hot air oven at 100±2° C. for 2 hours. Final settling at room temperature yields dry, white crystalline naphthalene with a melting point of 80.2° C., a purity of 97.27%, and a recovery efficiency of 77.7%.

The present disclosure provides systems and methods for separating an olefin from a paraffin. The systems and methods can include enriching an olefin from a feedstock comprising an olefin and a paraffin using a distillation column. The present disclosure also provides systems and methods for producing a polyolefin which can include separating un-reacted olefin from a reactor purge stream using a facilitated transport membrane. Among other advantages, the systems and methods described herein can increase overall polyolefin production from a factory, produce a paraffin-rich product, reduce energy demand and greenhouse gas emissions associated with a splitter column, and change the energy mixture for separation toward electrical energy.

A salt ion membrane may be paired with an absorption device to provide advantaged separation processes comprising: introducing a first aqueous salt stream and a mixed feed stream comprising at least one olefin and at least one paraffin to a salt ion membrane under conditions effective to form at least two phases; obtaining an olefin-rich permeate stream and an olefin-lean retentate stream from the salt ion membrane, in which the olefin-rich permeate stream and / or the olefin-lean retentate stream further comprises a salt ion membrane aqueous salt phase; introducing at least a portion of the olefin-lean retentate stream and a second aqueous salt stream to an absorption device under conditions effective to promote olefin extraction; obtaining an olefin-rich aqueous salt stream from the absorption device; and providing at least a portion of the olefin-rich aqueous salt stream as at least a portion of the first aqueous salt stream.