84 results about "Simulated moving bed" patented technology

The invention discloses a method for continuously and efficiently adsorbing and separating hydrogen isotopes. The hydrogen isotopes are separated by adopting a multi-tower variable-temperature variable-pressure device operated in a simulated moving bed operation mode. When the device runs, each adsorption tower needs to sequentially execute the following steps: 1, adsorption; 2, replacement; 3, heating; 4, vacuumizing and desorbing; 5, carrying out vacuum purging; 6, pressurizing and cooling; the operation mode of the simulated moving bed is that an adsorption tower is frequently, sequentially and synchronously moved along the gas flowing direction in the tower through all gas input and output ports, so that an adsorbent phase and a gas flowing phase in the tower form countercurrent flow, and the hydrogen isotope adsorption separation efficiency is enhanced. The invention relates to a technological process of cyclic adsorption, replacement, heating, vacuum desorption, pressurization and cooling, continuous and efficient hydrogen and isotope adsorption separation is realized, multi-tower serial adsorption and replacement are adopted in the process, and separation of hydrogen isotopes (such as H2 / D2) is enhanced; and the desorption efficiency of heavy components is improved by adopting a heating and vacuumizing depressurization coupling mode.

The invention provides a method for separating and purifying galactose and glucose by using a simulated moving bed chromatography system, and relates to the technical field of saccharide separation and purification. According to the method, the simulated moving bed chromatography system is used for separating and purifying the galactose, operation can be carried out under the set temperature condition, the separation and purification efficiency of the galactose is remarkably improved, continuous large-scale efficient separation and purification of the galactose can be achieved, the separation and purification effect is good, the yield is high, and the product quality is good. According to the method, pure water is used as an eluent, and analyzed and purified compounds are free of damage, low in toxicity, rich in source and low in cost.

A method for separating and purifying 4MP1 from a mixture containing 4MTP2 and 1-Hexene comprises the following steps: continuously introducing a solution in which 4MTP2, 1-Hexene and 4MP1 with any concentration are dissolved into a simulated moving bed chromatography system as a raw material solution, collecting a high-purity 4MP1 solution from raffinate of the simulated moving bed chromatography system by adopting a metal organic framework material as a stationary phase, and separating the high-purity 4MP1 solution from the raffinate of the simulated moving bed chromatography system. The extraction liquid is a solution containing impurities 4MTP2 and 1-Hexene. The invention provides a brand new method for separating 4MP1 from 4MTP2 and 1-Hexene, and a complete separation scheme is provided for the prior art; in the separation of high-concentration 4MP1, the relative purity of the separated and purified 4MP1 can reach gt; the recovery rate is gt; and in the separation of low-concentration 4MP1, the rectification level is also exceeded, and the method is more suitable for 4MP1 thermosensitive substances.

This invention relates to a method for the liquid-phase adsorption separation and purification of 2,3-dichloronitrobenzene and 3,4-dichloronitrobenzene, belonging to the field of chemical separation. This method for the simultaneous separation and purification of 2,3-dichloronitrobenzene and 3,4-dichloronitrobenzene involves preparing small spherical molecular sieve adsorbents from USY molecular sieves, silicon coupling agent-modified illite, and biomass polysaccharides, which are then loaded into a countercurrent simulated moving bed for separation and purification. This method can simultaneously obtain 2,3-dichloronitrobenzene and 3,4-dichloronitrobenzene with a purity ≥99%. The separation and purification method adopted in this invention is not only energy-efficient and highly effective, but also enables continuous production of two high-purity dichloronitrobenzenes, possessing significant industrial application value.

Systems and methods for recycling polymers. A method for recycling synthetic polymers by combining the polymers with a solid depolymerizing catalyst in a vessel, mechanically shearing the combined polymers and the solid depolymerizing catalyst against each other to produce monomers from the polymers; and collecting the monomers. The solid depolymerizing catalyst can be solid sodium hydroxide. Collecting the monomers can be achieved by contacting the sheared polymer and catalyst with a recyclable volatile solvent to dissolve the monomers. The method can include purifying the collected monomers for repolymerization. Purifying the monomers can be achieved using nanofiltration membrane technology, cyclic fixed bed adsorption, simulated moving-bed adsorption or a combination thereof.

The invention discloses equipment and a method for dry flue gas desulfurization based on a simulated moving bed, an adsorption tower and a regeneration double-tower process of traditional dry flue gas desulfurization are combined into a single module unit adsorption regeneration tower process, the tower is composed of a plurality of module units with the same function, and the module units are similar in structure, are arranged in parallel and are mutually independent. And a program control valve group is adopted for orderly switching the working process, so that efficient coupling among the multi-module units, the heating medium circulating system, the refrigerant circulating system and the carrier gas injection system in the tower is realized, and a continuously matched adsorption regeneration process among the multi-module units is realized. The process trend of a gas phase is periodically changed through a program control valve group, meanwhile, an adsorbent is kept still in situ, the effect of simulating a moving bed by a fixed bed is achieved, the solid adsorbent in the whole process is free of dynamic transfer and abrasion, the fixed bed can keep a good filling state, the gas phase is uniformly distributed in a bed layer, and the product quality is stable; and large handling capacity and automatic operation can be conveniently realized.

Process and device for simulated moving bed extraction of lithium by adsorption, in which at least one column (Ci) is supplied with a feed (F) comprising lithium and a desorbent (D), and an extract (E) and a raffinate (R) are withdrawn from the column. The column comprises an adsorbent solid (Ai) and is configured to operate in a closed loop. The supply and withdrawal points of the column are shifted over time by a value corresponding to a predetermined quantity of adsorbent solid with a permutation period and determine a plurality of operating zones of the column, in particular the following main zones: a lithium desorption zone I; a desorption zone II of compounds other than lithium; and a lithium adsorption zone III. According to the invention, a portion of the extract is recycled to the feed.

The application discloses a method for separating spirodiphenol by using an analog moving bed chromatography. The method for separating spirodiphenol specifically disclosed comprises the following steps: separating left-handed spirodiphenol and right-handed spirodiphenol from a spirodiphenol racemate by using an analog moving bed chromatography system; and the analog moving bed chromatography system has the following conditions: a stationary phase: silica gel coated with chiral polymer; and a mobile phase: a mixed solution of n-hexane and ethanol. The application can realize complete separation of two single enantiomers, obtain high purity and high recovery rate, and is more suitable for industrial production while being continuously operated. The process has strong stability, constant product quality, high automation degree, higher yield and lower cost than batch chromatography. The method also has the advantages of high yield, low cost, recyclable elution phase, green environmental protection, automatic and continuous production, stable product quality and the like.

The utility model provides a nitrile compound refining system and an amine compound preparation system, and relates to the technical field of nitrile compound separation and refining. The system comprises a separation tower which is provided with a first feeding hole, a tower top outlet and a tower kettle outlet; the simulated moving bed is provided with a second feeding hole, a first outlet, a second outlet and a solvent inlet, the second feeding hole is communicated with the tower top outlet, and the second outlet is communicated with the separation tower; the recovery tower is provided with a third feeding hole, a third outlet and a fourth outlet, the third feeding hole is communicated with the first outlet of the simulated moving bed, and the third outlet is communicated with the solvent inlet of the simulated moving bed; the rectifying tower is provided with a fourth feeding hole and a fifth outlet, and the fourth feeding hole is communicated with the tower kettle outlet of the separating tower. Through cooperation of the separating tower, the simulated moving bed and the rectifying tower, and through material circulation and solvent recovery, efficient separation of isomer impurities with approximate boiling points is realized, and energy consumption is reduced.

The invention relates to the field of petrochemical industry adsorption separation, and discloses fluid collection-mixing-uniform distribution equipment, application thereof and a simulated moving bed device. The fluid collection-mixing-uniform distribution equipment comprises a fluid injection and extraction pipeline, a fluid collection chamber, a fluid collection plate and a fluid uniform distribution plate which are sequentially arranged along the flowing trend of fluid; the fluid collection chamber is used for changing the flowing direction of fluid injected through the fluid injection and extraction pipeline; a fluid flowing channel is formed in the fluid collecting plate and is used for distributing fluid from the fluid collecting chamber for the first time; the fluid uniform distribution plate is used for carrying out secondary distribution on the fluid from the fluid collection plate and comprises a first area located under the fluid circulation channel and a second area outside the first area, and the circulation capacity of the second area is larger than that of the first area. The fluid collected by the equipment disclosed by the invention can obtain uniform speed distribution and component distribution.

The invention provides a method for separating lactulose and lactose by using a sequential simulated moving bed chromatography system, and relates to the technical field of saccharide separation and purification. According to the invention, the sequential simulated moving bed chromatography system is used for separating and purifying lactulose, and the analysis area, the refining area, the adsorption area and the isolation area can be operated at the same time under the set temperature condition, so that the separation and purification efficiency of lactulose is remarkably improved, continuous large-scale separation and purification of lactulose can be realized, the separation and purification effect is good, the yield is high, and the product quality is good. According to the method, pure water is used as an eluent, so that analyzed and purified compounds are free of damage and toxicity, rich in source and low in cost.

The application discloses a modeling method and device for a diesel aromatic hydrocarbon simulated moving bed adsorption separation device, and the method comprises the following steps: based on material balance principle and mass transfer mechanism, a bed layer flowing phase dynamic mechanism model and a bed layer fixed phase dynamic mechanism model of different components are respectively constructed; based on finite element method and orthogonal configuration method, discretization processing is performed to obtain a bed layer flowing phase dynamic mechanism discrete model and a bed layer fixed phase dynamic mechanism discrete model; based on material balance principle, a node model of different components is respectively constructed; and then, a bed layer dynamic mechanism discrete model of different components and a full-component bed layer dynamic mechanism discrete model are constructed, so that model parameters are optimized based on the full-component bed layer dynamic mechanism discrete model. The method can comprehensively, systematically and accurately reveal the quantitative relationship between a large number of parameters of the diesel aromatic hydrocarbon simulated moving bed adsorption separation device and device performance indexes, thereby realizing optimized design and optimized operation of the device, and having important industrial application value.

The present invention relates to a method for recovering a stream of purified PVC polymer, comprising: a) a dissolution step in which a plastic feedstock is contacted with a dissolution solvent; b) an extraction step by size exclusion in which fixed beds of size-exclusion solids are arranged in series, the crude polymer solution obtained in step a) is fed at injection point F, the eluate is fed at injection point S, the extract is withdrawn at withdrawal point E, and a raffinate comprising the purified polymer solution is withdrawn at withdrawal point R, the injection and withdrawal points shifting by one bed over time with a frequency determined by a predetermined changeover period; and c) a step in which the solvent and the polymer are separated to obtain a stream of purified PVC polymer. The present invention also relates to a device for the treatment of step b) and to a device for treating the recovery method.

This invention relates to the field of corn soaking water treatment technology, and particularly to a process for producing expanded compound fertilizer using corn soaking water, comprising the following steps: (1) passing the supernatant of corn soaking water after static sedimentation through an anion exchange resin column; (2) replacing the residual corn soaking water in the anion exchange resin column with compressed air, eluting with potassium sulfate solution, and collecting the first and second eluents respectively; (3) taking the first eluent, adjusting the pH, and then concentrating and hydrolyzing it, the resulting hydrolysate is flash-cooled and filtered, and the collected filtrate is used for later use; (4) taking the filtrate and processing it using a simulated moving bed chromatography separation system to obtain inositol product and phosphate phase; (5) taking the phosphate phase, concentrating and filtering it, adding a decolorizing agent to the collected filtrate, and after decolorization treatment, granulating and drying the decolorized liquid to obtain expanded compound fertilizer. The above process can produce expanded compound fertilizer.

A simulated moving-bed lithium adsorption process and apparatus in which a column (Ci) comprising a solid adsorbent is fed with a feed (F) comprising lithium and a desorbent (D) and is withdrawn of a raffinate (R) and an extract (E2), the column being divided into several predetermined quantities of solid adsorbent according to a permutation period defining the following zones: a zone I between the injection of the desorbent and the withdrawal of an eluate (E1) and the extract, a zone II between the withdrawal of the raffinate and the injection of the desorbent, and a zone III between the injection of the feed and the withdrawal of the raffinate, in which each permutation period comprises two steps: a step A of eluate withdrawal from zone I and a step B of extract withdrawal from zone I. Figure 3 to be published

A simulated moving bed (SMB) separation method and apparatus suitable for determining the water content of a compound stream circulating in an SMB unit (e.g., comprising xylene) by recording a near infrared (NIR) spectrum of a set of samples selected such that the water content of the sample at least partially covers a water content interval of the compound stream; measuring the water content of the sample group by a reference measurement method; developing a multiple regression correlation model between the NIR spectrum of the sample set and the water content of the sample set; recording the NIR spectrum of the compound stream; and applying the multivariate regression correlation model to the NIR spectrum of the compound stream to determine the water content of the compound stream.

This invention relates to a method for separating cresol using agglomerated zeolite adsorbent solids in a simulated moving bed, and to an optimized desorbent selected from 2-pentanol or 3-pentanol.

A simulated moving-bed lithium adsorption extraction method and apparatus using / comprising an extraction column (7) fed with a charge (6) comprising lithium and a desorbent (9) to withdraw an extract (10) and a raffinate (8), the column comprising a solid adsorbent (Ai) and being configured to operate in a closed loop, the column's feed and withdrawal points being offset over time by a value corresponding to a predetermined quantity of solid adsorbent with a permutation period and determining a plurality of column operating zones, in which the extract is sent directly to an evaporation section (17) adapted to separate water (18) and produce a concentrate (19). Figure 2 to be published

The invention relates to a method and device for extracting lithium by adsorption in a simulated moving bed in which a column (Ci) comprising an adsorbent solid is fed with a feedstock (F) comprising lithium and a desorbent (D), and a raffinate (R) and an extract (E2) are drawn off from the column, the column being divided into a plurality of predetermined quantities of adsorbent solid according to a switching period defining the following zones: a zone I between the injection of the desorbent and the drawing off of an eluate (E1) and the extract; a zone II between the drawing off of the raffinate and the injection of the desorbent; and a zone III between the injection of the feedstock and the drawing off of the raffinate, wherein each switching period comprises two steps: a step A of drawing off eluate from zone I and a step B of drawing off extract from zone I.

The invention relates to a method for separating alpha-olefin and alkane by using a sequential simulated moving bed, which comprises the following steps of: conveying Fischer-Tropsch light oil into the sequential simulated moving bed, and separating in the sequential simulated moving bed by using a desorption agent; wherein the desorption agent is a mixed solution of cyclohexene and normal hexane, or a mixed solution of cyclohexene and cyclohexane. The method disclosed by the invention is suitable for separating long-chain alpha-olefin and alkane, and an alpha-olefin product with high purity and high yield can be obtained.

Provided herein is a method of direct lithium extraction in which lithium ions are removed from a lithium-containing brine by adsorption onto a lithium-selective adsorbent, followed by eluting the adsorbed lithium. The process described herein is a discontinuous simulated moving bed process, in which brines or eluants are routed through a plurality of zones or columns, in turn, to reproduce the effect of lithium extraction via a simulated moving bed system. The discontinuous moving bed system, however, is based on a more efficient design that provides significant economies in resource use as well as construction and operation costs.

The invention relates to the technical field of corn soaking water treatment, in particular to a process method for comprehensively treating corn soaking water and obtaining inositol and potassium struvite, which comprises the following steps: treating corn soaking water supernatant as a raw material by first cation and first anion resin columns; the collected desorption solution is subjected to concentration, ultrasonic enzymolysis, decoloration and simulated moving bed chromatographic separation, an obtained inositol phase enters a second cation resin column and a second anion resin column, and an inositol product is obtained through concentration crystallization and drying; adding magnesium chloride hexahydrate into the collected salt phase, adjusting the pH value, filtering, respectively collecting precipitate (potassium struvite) and filtrate, concentrating and crystallizing the filtrate, filtering, and carrying out bipolar membrane electrodialysis treatment on the collected crystallization mother liquor; according to the process method, inositol and potassium struvite products can be obtained, phosphorus and potassium in the corn soaking water are recycled, resource waste is avoided, consumption of a resolving agent (potassium chloride) is reduced, and cost is saved.

A method for purifying active polysaccharides from *Fodium argentea* based on simulated moving bed chromatography is disclosed, relating to the food industry. The method includes the following steps: (1) extracting *Fodium argentea* to obtain a polysaccharide extract, and removing small-molecule sugars using membrane filtration; (2) fractionating and purifying the polysaccharide extract using simulated moving bed chromatography to obtain a purified solution; (3) concentrating and freeze-drying the purified solution after purification and impurity removal to obtain the purified active polysaccharides from *Fodium argentea*. The active polysaccharides from *Fodium argentea* obtained using this method exhibit a purity of 80-90% and a recovery rate of 70-80%, respectively, and possess high activity. This method provides high product activity, high yield, high separation efficiency, and large throughput, significantly improving raw material utilization, enabling continuous operation, and reducing production costs.

This invention provides a method for separating and purifying Bosein from an enzyme reaction solution. The method involves first ultrafiltration of the Bosein enzyme-catalyzed reaction solution through a ceramic membrane to remove proteins, followed by decolorization with activated carbon, and then impurity removal via a simulated moving bed continuous chromatography system. Afterwards, high-purity concentration, high-temperature reconstitution, and crystallization are performed. This invention utilizes a continuous chromatography separation system for desalting and impurity removal to improve product purity, and a separation and purification process based on ethanol recovery and recycling for cooling crystallization, which helps reduce production costs. This separation and purification process offers low purification cost, high yield, and high extraction purity. Therefore, this invention provides a novel, continuously producible, low-pollution, low-cost, high-yield, and high-purity crystalline Bosein purification method, which is beneficial for promoting the industrial production of Bosein.

The invention discloses a production process of high-purity camphorsulfonic acid, which comprises the following steps of: isomerizing alpha-pinene serving as a raw material into camphene under the catalysis of zirconium dioxide modified composite carbon-based solid acid, esterifying the camphene with anhydrous oxalic acid to generate oxalic acid dibornyl ester, and converting the oxalic acid dibornyl ester into isoborneol through alcoholysis. Carrying out hydrodeoxygenation on the isoborneol under the action of a Pd / C catalyst to generate camphor, and sulfonating the camphor to obtain a crude product; and continuously splitting through a simulated moving bed chromatography technology to obtain high-purity L-camphorsulfonic acid and D-camphorsulfonic acid finished products. According to the invention, waste eucalyptus powder and bamboo sawdust powder are taken as raw materials, alkali treatment and microwave activation are carried out to prepare a composite carbon carrier with a high specific surface area, zirconium dioxide nanoparticles are loaded, a solid acid catalyst with bifunctional catalytic sites is constructed, and efficient catalysis and cyclic utilization are realized. The continuous and high-purity separation of the chiral enantiomers is realized by utilizing the simulated moving bed chromatography technology, and the production efficiency and the product quality are remarkably improved.

The invention discloses a high-purity medium-chain and long-chain inulin separation method based on sequential simulated moving bed chromatography, and belongs to the technical field of food processing. According to the method, monosaccharide / disaccharide, short-chain inulin and medium-and-long-chain inulin in the chicory extract are successfully separated by using a three-component nine-column sequential simulated moving bed chromatographic separation system, and byproducts such as high-purity medium-and-long-chain inulin and short-chain inulin can be obtained. The high-purity medium-long-chain inulin separation method provided by the invention is high in separation efficiency, three product fractions can be simultaneously obtained in one separation process, and the process is simple and efficient. The high-purity medium-long-chain inulin separation method based on the sequential simulated moving bed chromatography provided by the invention can be continuously operated and is high in automation degree.

Systems and methods for recycling polymers are provided. One embodiment provides a method for recycling synthetic polymers by combining the polymers with a solid depolymerizing catalyst in a vessel, mechanically shearing the combined polymers and the solid depolymerizing catalyst against each other to produce monomers from the polymers; and collecting the monomers. In some embodiments the solid depolymerizing catalyst is solid sodium hydroxide. In some embodiments collecting the monomers is achieved by contacting the sheared polymer and catalyst with a recyclable volatile solvent to dissolve the monomers. In some embodiments, the method includes purifying the collected monomers for repolymerization. In some embodiments purifying the monomers is achieved using nanofiltration membrane technology, cyclic fixed bed adsorption, simulated moving-bed adsorption or a combination thereof.

The invention relates to a method for separating and purifying 4MP1 from a mixture containing 4MTP2 and 4MCP2, which comprises the following steps: continuously introducing a solution in which 4MTP2, 4MCP2 and 4MP1 with any concentration are dissolved into a simulated moving bed chromatography system as a raw material solution, collecting a high-purity 4MP1 solution from an extract liquor of the simulated moving bed chromatography system by taking a molecular sieve as a stationary phase, the raffinate is a solution containing impurities 4MTP2 and 4MCP2. The invention provides a brand new method for separating 4MP1 from 4MTP2 and 4MCP2, and provides a complete separation scheme for the prior art; in the separation of 4MP1 with the concentration not lower than 95%, the relative purity of the separated and purified 4MP1 basically reaches 99 wt% or above, and the recovery rate is gt; and in the separation of low-concentration 4MP1, the method has a higher level than rectification.

Provided is a method for preparing lactulose using immobilized β-galactosidase. The method comprises the following steps: pretreating a macroporous weakly basic styrene-based anion exchange resin; mixing the pretreated resin with a β-galactosidase solution and adding same to a buffer, adsorbing same using a shaker, and leaving same to stand after adsorption; then adding a glutaraldehyde solution for cross-linking, and discarding the supernatant to obtain an immobilized enzyme column; adding a magnesium ion solution to a mixed solution of lactose and fructose, and then converting same by means of the immobilized enzyme column to obtain a lactulose conversion solution; and sequentially performing decolorization, ion exchange, vacuum concentration, and sequential simulated moving bed chromatography separation on the lactulose conversion solution to obtain a lactulose solution.

The application provides a method for regulating and strengthening hydrogen isotope simulated moving bed separation by pore structure, and belongs to the technical field of hydrogen isotope separation and purification. The method comprises the following steps: immersing an adsorption column filled with pre-activated adsorbent and corresponding gas pipelines into a solvent; introducing hydrogen isotope raw gas into at least two adsorption columns for adsorption, introducing displacement gas into at least two adsorption columns for displacement, and performing regeneration on at least two adsorption columns for regeneration; every 4-20 min, switching valves to make the adsorption columns perform different operations to simulate the reverse movement of the adsorbent relative to the gas; the hydrogen isotope raw gas comprises H2 / D2 or H2O / D2O, and the displacement gas comprises D2 or D2O; the adsorbent is a microporous material with adjustable pore structure, and the pore size ranges from 0.4 nm to 5 nm. The application has excellent separation performance, the purity of D2 reaches 98%, the recovery rate of H2 and D2 is 95%, and the desorption can be completely regenerated in 20 min; the purity of D2O reaches 90%, and the desorption can be completely regenerated in 30 min, thereby greatly improving the selectivity and separation efficiency between hydrogen and deuterium.