22results about "Fractional crystallization" patented technology

This application relates to the field of functional crystalline material preparation and microfluidic application technology, specifically disclosing a method and product for preparing formate crystals using core-shell microcapsules, including the following steps: (1) dissolving a solid alkaline raw material in a formic acid solution to prepare reaction solution a; (2) separately conveying polymer solution A and polymer solution B with phase separation characteristics, and reaction solution a, so that they are mixed at the intersection of microchannels to prepare dispersed phase b, which is then introduced into the assembly zone for phase separation assembly to form core-shell microcapsules; (3) the core-shell microcapsules are crystallized in a continuous temperature-changing crystallization zone to form formate solid; (4) the formate solid is collected, washed and dried sequentially to obtain the target product; (5) the oil layer is continuously extracted and returned to the assembly zone for recycling. The formate crystals prepared in this application not only have a large particle size, but also exhibit good size uniformity and morphological repeatability, and have the advantages of high throughput, green environmental protection, and simple operation.

A method and system for separating sublimable compounds from hydrocarbons are disclosed. A feed fluid stream consisting of hydrocarbons and sublimable compounds is introduced into the upper chamber of a vessel. The feed fluid stream is cooled in the upper chamber, causing a portion of the sublimable compounds in the feed liquid stream to sublimate to form a product gas stream and a sublimable compound snow-like substance, the latter of which is collected in the lower chamber of the vessel. The lower portion of the sublimable compound snow-like substance is melted to form a liquid sublimable compound stream, such that the upper portion of the solid sublimable compound snow-like substance remains as an insulating barrier between the upper chamber and the liquid sublimable compound stream. The sublimable compound stream is removed from the ore liquid at a rate matching the rate of formation of the solid sublimable compound snow-like substance, thereby maintaining the insulating barrier.

The invention relates to the technical field of lithium compound purification and crystallization, in particular to a lithium hydroxide solution multi-stage cooling crystallization device and a working method thereof.The lithium hydroxide solution multi-stage cooling crystallization device comprises a raw material liquid storage tank, a concentrator, a filter, a first-stage crystallizer, a second-stage crystallizer, a third-stage crystallizer, a centrifugal separator and a drying machine; the first-stage crystallizer, the second-stage crystallizer and the third-stage crystallizer are connected in series through a delivery pump, the third-stage crystallizer comprises a kettle body, a jacket is arranged in the kettle body, a feeding hole is formed in the top of the kettle body, and a discharging hole is formed in the bottom of the kettle body; by means of the unique design of the sealing cover, the discharging inner cavity and the built-in discharging channel, fine crystals scraped on the inner wall are collected and guided out of the kettle at the moment of generation. The problem of secondary pollution caused by a traditional wall scraping mechanism is thoroughly solved, secondary nucleation induced by fine grains is avoided from the source, and the method is the key for obtaining products with narrow particle size distribution.

The present invention relates to a brine valorisation system for recovering at least one mineral salt and / or at least one metal from a monovalent brine (MVB) stream and / or a polyvalent brine (PVB) stream, the brine valorisation system comprising: I. (a) an ultra-high pressure reverse osmosis (UHPRO) system (402) for processing the MVB stream (104a) into a UHPRO retentate and desalinated water; (b) either (I) an osmotically assisted reverse osmosis (OARO) system (404) comprising one or more OARO stage or (ii) a thermal evaporation unit, for concentrating the UHPRO retentate to produce a concentrated UHPRO retentate; and (c) a crystallizer system (406) for processing at least a portion of the concentrated UHPRO retentate to produce distilled water, a monovalent purge stream and a mineral salt, wherein the mineral salt comprises sodium chloride crystals; and / or II. two or more clarifiers for processing the PVB stream, wherein the two or more clarifiers comprise a calcium clarifier and a magnesium clarifier, and wherein the calcium clarifier produces a calcium rich sludge comprising a calcium salt and / or metal, and a low calcium supernatant, and the magnesium clarifier produces a magnesium rich sludge comprising a magnesium salt and / or metal, and a low magnesium supernatant. Also provided is a system for recovering at least one mineral salt and / or at least one metal from seawater and / or another high salinity solution using the brine valorisation system of the invention; as well as methods for recovering at least one mineral salt and / or at least one metal from a monovalent brine (MVB) stream and / or a polyvalent brine (PVB) stream.

The present disclosure relates to a method for separating lithium from a lithium mixture, the method comprising the steps of providing a first mixture (104) comprising at least a first compound of lithium, lithium hydride, and lithium deuterium and lithium tritide and at a first temperature, a first stirring step (108) adapted to stir the first mixture, a first cooling step (110) adapted to cool the first mixture, preferably uniformly, to a second temperature lower than the first temperature, the first stirring step and the first cooling step adapted to deposit at least a portion of the first compounds, and a first separation step (116) adapted to separate at least the deposited first compounds from the first mixture and form a second mixture (118) comprising at least lithium and lithium hydride.

Disclosed herein are electro-dialytic crystallizers and methods of use thereof. For example, described herein are electro-dialytic crystallizer systems comprising an electro-dialysis module and a crystallizer module in liquid communication with the electrodialysis module. The electrodialysis module is configured to receive an aqueous feedwater solution and form a diluate stream and a brine stream, the aqueous feedwater solution comprising an ionic component, the diluate stream having a lower concentration of the ionic component relative to the aqueous feedwater solution, and the brine stream having a higher concentration of the ionic component relative to the aqueous feedwater solution. The crystallizer module is configured to receive the brine stream and form crystals comprising the ionic component and a supernatant. Also disclosed herein are methods of use of any of the systems disclosed herein, for example using the system to treat the aqueous feedwater solution.WO

In the BHET crystallization process, the BHET solution is introduced into a crystallizer located at the bottom of the crystallizer and equipped with agitator blades arranged coaxially with the draft tube. The draft tube is arranged coaxially with the inner wall of the tank, and multiple heat exchange plates, through which a cooling fluid circulates, are placed in the gap formed between the inner wall of the tank and the draft tube. The thrust of the agitator blades drives the solution through the gap, and the large heat exchange area with the heat exchange plates allows for efficient cooling without excessive agitation of the liquid. The resulting suspension is rich in BHET crystals and low in fines, and is discharged from the crystallizer and sent to the subsequent BHET processing step.

A process for dry fractionation of a soft palm oil mid fraction (SPMF) into a final hard palm oil mid fraction (fHPMF-A)is disclosed. The process comprises: providing the soft palm oil mid fraction (SPMF), using the soft palm oil mid fraction (SPMF) as an input (IN1) to a first dry fractionation (FDF) to obtain an intermediate olein fraction (SPMF-O) and an intermediate stearin fraction (SPMF-S), using the intermediate olein fraction (SPMF-O) as an input (IN2) to an ultrasound assisted second dry fractionation (SDF) to obtain the final hard palm oil mid fraction (fHPMF-A) and a palm oil olein fraction (POO), wherein the ultrasound assisted second dry fractionation (SDF) comprises subjecting at least a part of the input (IN2) to ultrasonic treatment (US2). Also disclosed is afinal hard palm oil mid fraction (fHPMF-A), a second hard palm oil mid fraction (sHPMF-B), a hard palm oil mid fraction mixture, and uses of these.

The invention provides a device and a method for controlling gradient crystallization by a gas-liquid microreactor with a flow field structure, which are characterized in that the device comprises a gas storage bottle and is characterized in that the gas storage bottle is connected with a preheater through a gas outlet pipe, the preheater is connected with a microreactor through a gas conveying pipe, the top of the microreactor is connected with a gas-liquid separator through a pipeline, and the gas-liquid separator is connected with the gas-liquid separator through a pipeline. The bottom of the gas-liquid separator is connected with a crystal separation tank through a pipeline, the crystal separation tank is connected with a raw material liquid storage tank through a pipeline, a stirring mechanism is mounted in the raw material liquid storage tank, and the bottom of the raw material liquid storage tank is connected to the bottom of the microreactor through a pipeline; the gas-liquid micro-reactor is a vertical segmented micro-channel and is divided into three functional areas, namely a preheating section, a crystallization section and a curing section, and the sections are hermetically connected through flanges, so that the gas-liquid micro-reactor is convenient to clean and replace; the flow guide plates are spirally and obliquely arranged in the crystallization section, so that a bubble rising path can be disturbed, the gas-liquid contact time is prolonged, and the coupling effect of a flow field and a temperature gradient is enhanced.

The present invention relates to a method for treating salt-containing dusts which accumulate during operation of industrial plants, e.g. in waste incineration plants, or during operation of rotary kilns, e.g. in cement production plants or clinker production plants. The method comprises a step a) of forming an aqueous solution by bringing salt-containing dusts into contact with an aqueous phase; a step b) of removing heavy metals from the aqueous solution; and a step c) of separating alkali metal chlorides from the aqueous solution; and the bringing of salt-containing dusts into contact with an aqueous phase in step a) is achieved by means of a multi-stage arrangement through which the salt-containing dusts and the aqueous phase pass in opposite directions.

Provided is a method for purifying a compound capable of providing a high purity compound in high yield and at low cost. The present invention relates to the method for purifying a compound using a purification apparatus, the purification apparatus including: a crystallizing unit including a crystal forming section; and a wash column including a mechanism that forcibly transfers crystals. The crystallizing unit includes N tanks connected in series, wherein N is 2 or greater, a 1st tank is a most downstream tank, a (N)th tank is a most upstream tank, at least the 1st tank is a crystallization tank including a cooling mechanism, and a 2nd and subsequent tanks are each a crystallization tank or a ripening tank. The purification apparatus includes a line that feeds a compound-containing liquid to be purified to at least one of the N tanks. The wash column includes a line that sends a product out; and a line that returns a mother liquor to the crystallizing unit, with the line that returns a mother liquor to the crystallizing unit being connected to at least the (N)th tank. The crystallizing unit includes a line that feeds a slurry from the (N)th tank to the wash column; a line that sends a slurry from a tank among the 1st to (N - 1)th tanks to the next upstream tank; and a line that is provided to each of the 1st to (N - 1)th tanks and that sends thereto a mother liquor withdrawn from an upstream tank, wherein at least one of the lines that send a slurry from a tank among the 1st to (N - 1)th tanks to the next upstream tank is a line that sends a slurry from a tank to the next upstream tank via a solid-liquid separator and that has a line that returns a mother liquor from which crystals are removed in the solid-liquid separator to the tank where the slurry came from, and wherein the line that is provided to each of the 1st to (N - 1)th tanks and that sends thereto a mother liquor withdrawn from an upstream tank is a line that directly sends a mother liquor withdrawn from a tank one upstream or a line that sends a mother liquor withdrawn from a tank one upstream via a solid-liquid separator. The purification method includes forming crystals of the compound in the crystallizing unit; discharging at least a portion of a mother liquor to the outside of the purification apparatus; separating a slurry containing the formed crystals into a mother liquor and a slurry having an increased crystal concentration; returning at least a portion of the separated mother liquor to the tank where the slurry came from; mixing a compound-containing liquid to be purified fed to the crystallizing unit with a slurry in the crystallizing unit; sending a slurry in order from any one of the 1st to (N - 1)th tanks to the next upstream tank among the N tanks in the crystallizing unit; and feeding at least a portion of a slurry from the crystallizing unit to the wash column; wherein the compound-containing liquid to be purified has a higher purity than the mother liquor discharged to the outside of the purification apparatus, the slurry fed to the wash column contains a mother liquor having a purity A1 of 80 mol% or higher, and a difference between the purity A1 and a purity A2 of the mother liquor discharged, A1 - A2, is 5 mol% or more.

The present invention relates to a method for separating enantiomer crystals by enantioselective crystal flotation, and to a method in which preferential crystallization is combined with enantioselective crystal flotation.

The present invention relates to a method for treating salt-containing dusts which accumulate during operation of industrial plants, e.g. in waste incineration plants, or during operation of rotary kilns, e.g. in cement production plants or clinker production plants. The method comprises: a step a) of forming an aqueous solution by bringing salt-containing dusts into contact with an aqueous phase; a step b) of removing heavy metals from the aqueous solution; and a step c) of separating alkali metal chlorides from the aqueous solution; and salt-containing dusts are brought into contact with an aqueous solution in step a) by means of a multi-stage arrangement through which the salt-containing dusts and the aqueous phase pass in opposite directions.

The present invention relates to a process for the separation of enantiomeric crystals by enantioselective crystal floatation and to a process in which preferential crystallization is combined with enantioselective crystal floatation.

The application discloses a system for recovering high-purity fluorite from fluorine-containing wastewater, comprising a fluidized bed, wherein a water distribution area, an induced crystallization area and a precipitation area are sequentially arranged in the fluidized bed; the system further comprises a pretreatment device, a crystallization agent storage tank and a collection tank; the water distribution area is located at the bottom of the fluidized bed; a water distributor connected with a water inlet of the fluidized bed is arranged in the water distribution area, and a polytetrafluoroethylene ball layer is stacked on the water distributor; at least three layers of medicine distributors are arranged in the induced crystallization area at equal intervals, and the at least three layers of medicine distributors are arranged above the polytetrafluoroethylene ball layer and connected with medicine inlets in the side wall of the fluidized bed respectively; a crystallization separation device is arranged above the uppermost medicine distributor. The system can treat the fluorine-containing wastewater with a fluorine content of 200-800 mg / L commonly seen in the electronic industry, and simultaneously generate high-purity fluorite crystals, so that the fluorine can be recycled and reused.

Producing high purity lithium solution from a source brine containing at least 1 mg Li / kg brine, preferably 10 mg / kg, more preferably 25 mg Li / kg brine; treating the source brine, if necessary in pretreatment steps; processing the treated brine in a lithium adsorption step; after the adsorption step, desorbing the adsorbed lithium in a desorption step; after the desorption step, treating the desorption effluent in an enrichment step. Specified optional steps and new features can be used to increase lithium concentrations and purity.

The invention discloses a preparation process of electronic-grade ATMP, and belongs to the technical field of water treatment. The process aims at solving the problems that the content of impurities such as Cl <-> and Fe in an existing ATMP product is high, and the electronic-grade application requirement is difficult to meet. The process combining ion exchange treatment and recrystallization purification is adopted, firstly, metal ions of an industrial-grade ATMP raw material are preliminarily removed through ion exchange resin, then concentration crystallization and recrystallization are sequentially conducted, and finally the high-purity ATMP product is obtained through blending. By means of the process, the electronic-grade ATMP with the key indexes that the Cl <-> content is smaller than or equal to 100 ppm and the Fe content is smaller than or equal to 1 ppm can be stably produced, the product purity is high, the process operation is simple, the cost is low, and the process is suitable for industrial production.

The invention relates to the technical field of separation and purification, in particular to a method for separating and purifying an aminocaprolactam crude product and application of an aminocaprolactam crystal product prepared by the method. The method comprises the following steps: (1) cooling an aminocaprolactam crude product to T1 for the first time to form a crystal nucleus, heating to T1 'for the first time, dissolving part of the crystal nucleus, and taking the rest of the crystal nucleus as a seed crystal; (2) secondarily cooling the material obtained in the step (1) to T2, crystallizing, and separating mother liquor; (3) the coarse crystal obtained in the step (2) is heated to T2'for sweating, sweat is separated, and an aminocaprolactam crystal product is obtained.According to the method, the aminocaprolactam coarse product serves as a raw material, and the aminocaprolactam crystal product with high purity and high recovery rate is obtained through the technical means of one-step crystallization and sweating.

The present disclosure relates to a method for isotope separation of lithium, comprising the steps of providing a first mixture (104) comprising at least lithium, lithium hydride, and optionally lithium deuteride and / or lithium tritide and at a first temperature, a first cooling step (110), preferably a uniform cooling step, adapted to cool the first mixture to a second temperature lower than the first temperature, the first cooling step adapted to precipitate a first portion of lithium hydride having a first lithium isotope, and a first separation step (124) adapted to separate the precipitated first portion of lithium hydride from the first mixture to form a second mixture (122).

The invention discloses a method for preparing 5N ammonium rhenate. The method comprises the following steps: S1, preparing feed liquid; s2, oxidizing hydrogen peroxide to convert low-valence cations; s3, carrying out ion exchange on the chelate resin to remove high-valence cations; s4, deeply separating positive ions through electrophoresis; s5, removing low-valence cations through ionic membrane separation; s6, evaporation and concentration; and S7, performing segmented crystallization. By constructing a four-stage quality-grading impurity removal system and matching with a segmented crystallization and mother liquor circulation process, metal impurities can be comprehensively and efficiently removed, the product purity stably reaches the 5N grade, the chromaticity is excellent, the rhenium recovery rate is high, the process conditions are mild, operation is stable, and the method is suitable for industrial large-scale production and can meet the requirement of the high-end field for high-purity ammonium rhenate.

The present invention describes a method to produce high purity hydrocarbon materials from renewable sources. The produced materials are chemically indistinguishable from highly refined mineral oils and / or synthetic hydrocarbons. These renewable hydrocarbon materials can be used as a drop-in replacement for mineral and synthetic hydrocarbon base oils, process fluids, white oils in products such as lubricants, rubber, personal care, pharma.