46results about "Product crystals bed crystallization" patented technology

The invention discloses a use method of 2, 4-dihydroxybenzoic acid dissolving and recrystallizing equipment, the 2, 4-dihydroxybenzoic acid dissolving and recrystallizing equipment comprises a closed dissolving kettle, a crystallization kettle and a mother liquor storage tank, the closed dissolving kettle, a first separator, a first filtrate storage tank and the crystallization kettle are connected in sequence, and the mother liquor storage tank is connected with a second separator. A discharge port of the crystallization kettle is connected with a feed port of a second separator, a filtrate discharge port of the second separator is connected with a liquid inlet of a second filtrate storage tank, and a liquid outlet of the second filtrate storage tank is communicated with a liquid inlet of the mother liquid storage tank through a third pipeline; the second pipeline between the first separation column and the second pump body is communicated with a liquid outlet of the mother liquid storage tank through a fourth pipeline; the second pipeline between the second pump body and the fourth pipeline is communicated with one end of a backflow pipeline, and the other end of the backflow pipeline is communicated with the first pipeline. The 2, 4-dihydroxy benzoic acid dissolving and recrystallizing equipment disclosed by the invention can be used for preparing 2, 4-dihydroxy benzoic acid with the purity of 99.68%, and the content of metal ions is reduced to 0.15 ppm.

A liquid separation method (10) for separating mono ammonium phosphate ("MAP") (20) in aqueous solution, includes: • a receiving step in which a process liquid which comprises water and MAP is received; • a cooling step in which a controlled cooling process is applied to the process liquid to induce the crystallization (14) of MAP; • a separating step (16) in which the crystallised MAP is separated from the remaining process liquid.

The invention discloses a processing method for fractionation and rapid crystallization of palm oil, which comprises the following steps: (1) heating and controlling a palm oil raw material to be fractionated to 55-65 DEG C (crystal breaking), pumping the palm oil raw material into a crystallizing tank, and then cooling the palm oil raw material to about 25 DEG C under the action of rapid cooling of cooling water (or chilled water) and stirring; (2) continuously reducing the temperature of the palm oil raw material in the crystallizing tank by using chilled water, adding a certain proportion of palm oil (solid-liquid mixture) which is completely crystallized and is in an unseparated state into the crystallizing tank at the interval of 25.0-18.0 DEG C as a seed crystal, and controlling the stirring speed of the crystallizing tank at 15-30r / min until the palm oil raw material is completely cooled and crystallized; (3) after crystallization is completed, if seed crystals need to be added into the crystallizing tank which is cooling and crystallizing, pumping the seed crystals into the crystallizing tank which needs to be added with the seed crystals through a pump; otherwise, immediately pumping into a membrane filter for filtering and separating (preventing the tank from being burnt) to obtain liquid oil and stearin. The palm oil seed crystal is added, so that the crystallization time can be shortened; and through seed crystal induction, the formation of stable-form crystals is accelerated, excessive crystallization is avoided, and the interception loss of filtration is reduced, so that the liquid oil yield is improved.

The present disclosure provides a preparation system and a preparation method for xylitol crystals. In the preparation system, outlets of a first centrifuge are connected with an inlet of a hot air drying tank and an inlet of a primary mother liquor storage tank through pipelines, respectively. Outlets of a second centrifuge are connected with an inlet of a second fluidized bed dryer and an inlet of a secondary mother liquor storage tank through pipelines, respectively. An outlet of a dicrystalline sugar dissolution tank is connected with an inlet of a blending tank through a pipeline. An outlet of a tricrystalline sugar dissolution tank is connected with the inlet of the primary mother liquor storage tank. The blending tank is provided with an inlet for a raw material of xylitol hydrogenation solution. An output of an outlet of a first fluidized bed dryer is prepared xylitol crystals.

This invention provides a production process for manufacturing metallic magnesium and industrial silicon by decomposing serpentine using the hydrochloric acid method. [Solution] The present invention provides a method for processing serpentine ore as a raw material using a two-stage countercurrent hydrochloric acid leaching process. The wet process steps include storage and filtration of the slurry after ore dressing, two-stage hydrochloric acid leaching under atmospheric pressure, washing and filtration of the silicon slag after leaching, removal of iron and nickel precipitation from the leaching solution, separation, washing and filtration of the obtained iron hydroxide and nickel hydroxide, crystallization and evaporation of the magnesium chloride solution, and production of hydrochloric acid using the gas generated after the thermal decomposition of magnesium chloride. The present invention has developed a serpentine decomposition technology using hydrochloric acid, a metallic magnesium production process using a drying-electrolytic method, and a process for producing industrial silicon by smelting silicon slag in an electric furnace.

This invention belongs to the technical field of anthracene oil processing and production, and discloses a production method for increasing the anthracene and carbide content in crude anthracene products using crystal nucleus seeds. The method mainly involves cooling the heated raw anthracene oil to 75°C, then adding high-quality crystal nucleus seeds (70% anthracene content, 17% carbide content, and ≤1% mechanical impurities) to a crystallization tank at a mass ratio of 1:75. At this point, the high-quality crystal nucleus seeds promote the formation of new crystal nuclei in the anthracene oil liquid. As the temperature decreases, the newly formed crystal nuclei gradually grow. Simultaneously, the temperature is naturally lowered to below 65°C through stirring, and the cooling system in the crystallization tank is activated to further cool the temperature to 35-40°C. The mixture is then repeatedly fed and dried in a centrifuge to produce high-quality crude anthracene. This invention utilizes unique high-quality crystal nucleus seeds to achieve an anthracene content of over 40% and a carbide content of over 14% in crude anthracene even when the anthracene and carbide content in the raw anthracene oil is low or unstable, resulting in a superior-grade crude anthracene product.

A process for treating fluids for the removal of sulphate therefrom, the process comprising passing a fluid containing a sulphate and carbonate through a fluidized bed reactor; and, loading sulphate to said fluidized bed reactor at a rate that is greater than 1 kg of sulphate per square metre of said fluidized bed reactor per hour (kg SO4 / m2 / hr); thereby co-precipitating the sulphate and carbonate. The process must maintain the supersaturation levels of calcium sulphate within a predefined range of 100-450% and provides a loading rate of sulphate in the reactor that is greater than 1 kg of sulphate per square metre of reactor per hour (kg SO4 / m2 / hr).

The invention relates to a method for initiating the crystallization of a solute present in a solution (S) at a concentration that makes it metastable, comprising the application of one or more plasma pulses to the solution (S).

Systems and methods for preparing compound crystals of erythritol and high-intensity sweeteners are provided. The systems may comprise a fermentation liquid storage tank (1), a ceramic membrane filtration system (2), a nanofiltration system (3), a first evaporator (4), a first crystallization kettle (5), a first centrifuge (6), a sugar dissolution tank (7), a decolorization tank (8), an ion exchange column (9), a blending tank (10), a second evaporator (11), a second crystallization kettle (12), a second centrifuge (13), a hot-air drying tank (14), a fluidized drying bed (15), and a finished product tank (16) sequentially connected through pipelines. The systems may further comprise a high-intensity sweetener storage tank (17), a primary mother liquor tank (18), and a secondary mother liquor tank (19). The finished product tank (16) may store a prepared compound crystallization product of the erythritol and the high-intensity sweetener.

Compositions and methods are provided for producing crystalline forms of organic acids or salts or lactones thereof from an aqueous solution. More specifically, methods are provided for producing a crystalline form of a salt of mevalonic acid (also referred to as X-MVA) from an aqueous solution, comprising subjecting the aqueous solution comprising said X-MVA to a purification step to produce a purified solution and crystallizing said X-MVA from said purified solution by water solvent crystallization. Methods are also provided for producing mevalonolactone from an aqueous solution comprising X-MVA, comprising subjecting the aqueous solution comprising said X-MVA to cation exchange thereby converting said aqueous solution comprising X-MVA to an aqueous solution comprising mevalonolactone (MVL). Methods are also provided for producing mevalonolactone monohydrate crystals.

The present application relates to a kind of large particle size sodium nitrate multistage flash cooling crystallization production systems, it includes feed unit, evaporation unit, seed unit, flash crystallization unit, condensation unit, thickening unit, centrifugal drying unit and mother liquor reflux unit, seed unit includes material pump and seed tank, the discharge port of separator is connected to seed tank by material pump;Flash crystallization unit includes first flash crystallization ware, first material pump, second flash crystallization ware, second material pump, third flash crystallization ware and third material pump, the discharge port of seed tank is connected to the feed port of first flash crystallization ware, first flash crystallization ware, second flash crystallization ware, third flash crystallization ware are sequentially connected.The sodium nitrate solution of the present application is distributed uniformly by multistage flash, crystal growth time, and crystal size is adjusted by controlling fine crystal elimination amount, crystal size is large, particle size distribution is uniform, crystal size D90≥0.9mm, variation coefficient CV≤25.

The present technology relates to processes useful for making crystalline S)-1, 1-bis(4-fluorophenyl)propan-2-yl (3-acetoxy-4-methoxypicolinoyl)-Lalaninate Compound (I) comprising: distilling a mixture comprising: an aprotic organic solvent, a protic organic solvent, Compound (I) and seed Compound (I), or comprising: distilling a mixture comprising: an aprotic organic solvent and Compound (I), and crystallizing Compound (I) by creating a second mixture comprising: a protic organic solvent, Compound (I) and seed Compound (I). Processes disclosed herein describe more stable, storage compatible preparations of Compound (I). Also disclosed are preparations of Compound (I) which have fewer (trace) impurities.

The application belongs to the technical field of biological medicine, and specifically provides a cefotaxime acid and a continuous preparation method thereof. The method comprises the following steps: firstly, mixing 7-ACA suspension liquid with triethylamine solution; then, condensing the mixture with AE-active ester solution; then, extracting and separating the condensate liquid twice through an extraction separation device and methylene chloride back extraction to obtain an aqueous phase; reacting the aqueous phase with hydrochloric acid to obtain cefotaxime acid crystallization liquid; finally, taking part of the cefotaxime acid crystallization liquid to prepare seed crystal mixture liquid, adding the remaining cefotaxime acid crystallization liquid and crystallization solvent into the seed crystal mixture liquid at a specific speed to obtain cefotaxime acid. The method realizes continuous preparation of cefotaxime acid, significantly shortens the preparation period, improves the production efficiency, reduces the side reaction and product degradation, lays a foundation for preparing high-quality cefotaxime acid, and is beneficial to industrial production.

A method of manufacturing a particulate precursor material, comprising providing a suspension of seed particles in a liquid vehicle. A precipitation reaction involving one or more transition metal sou

The invention relates to the technical field of melamine, and discloses a production method and system of melamine. The generation method comprises the following steps: taking urea as a raw material to react to obtain melamine, and collecting mixed gas containing the melamine; the method comprises the following steps: sequentially carrying out cooling filtration, fluidization crystallization and gas-solid separation on the mixed gas containing melamine, and collecting solids to obtain a melamine product; the fluidized crystallization comprises the following steps: the cooled and filtered mixed gas and medium particles enter a fluidized bed crystallizer for fluidized crystallization to obtain mixed gas containing melamine crystals, and the mixed gas containing the melamine crystals is discharged from the top of the fluidized bed crystallizer.

A method for preparing metallic magnesium and industrial silicon by decomposing serpentine with hydrochloric acid is provided. Serpentine is used as a raw material, and is processed by a two-stage countercurrent leaching process in a hydrochloric acid system. A hydrometallurgical process is adopted, including beneficiation, wet grinding, slurry storage, filtration, two-stage atmospheric pressure hydrochloric acid leaching, washing and filtration of leached silica slag, iron removal and nickel precipitation from a leachate, separation, washing and filtration of a ferric hydroxide precipitate and a nickel hydroxide precipitate, crystallization and evaporation of a magnesium chloride solution, and hydrochloric acid preparation from a flue gas generated after thermal decomposition of magnesium chloride. The present disclosure develops a process of decomposing serpentine with hydrochloric acid and producing metallic magnesium by a drying-electrolysis method, and a process of producing industrial silicon by smelting silica slag in an electric furnace.

The present technology relates to a process useful for preparing the crystalline (S)-1,1-bis(4-fluorophenyl)propan-2-yl (3-acetoxy-4-methoxypicolinoate)-L-alaninate compound (I), which comprises distilling a mixture, which comprises distilling a mixture containing an aprotic organic solvent, a protic organic solvent, the compound (I), and a seed crystal of the compound (I), or which comprises distilling a mixture containing an aprotic organic solvent and the compound (I) and crystallizing the compound (I) by preparing a second mixture containing a protic organic solvent, the compound (I), and a seed crystal of the compound (I). The process disclosed herein describes a more stable and storage-compatible preparation of the compound (I). Preparations of the compound (I) having fewer (trace) impurities are also disclosed.

The invention belongs to the technical field of ardealite resource utilization, and particularly relates to a pretreatment and resource recovery method of ardealite leacheate. The pretreatment method comprises the following steps: carrying out rough filtration and flocculating settling treatment on the ardealite leacheate, then adding an alkaline precipitant to adjust the pH value to 9.5-11.5, stirring to carry out precipitation reaction, then adding a reducing agent and / or a vulcanizing agent, stirring to carry out reduction and / or vulcanization reaction, and filtering to remove precipitated floc and colloid after the reaction is completed; and carrying out adsorption and fine removal on the obtained filtrate to remove residual dissolved heavy metals so as to obtain the pretreated phosphogypsum leacheate. According to the method, traditional precipitation, vulcanization, adsorption and other methods are organically integrated, various metal impurities and interference ions easy to co-precipitate in the ardealite leacheate are efficiently and selectively removed, and subsequent recycling (F / P recovery) coupling is facilitated.

A method of manufacturing a particulate precursor material, comprising providing a suspension of seed particles in a liquid vehicle. A precipitation reaction involving one or more transition metal sou

Payload systems for processing chemical substances under various gravity levels, such as hypergravity and / or microgravity. The payload systems may include a hypergravity thermal payload system configured to enable melt or cooling of a sample under hypergravity. Alternatively, or in addition, the payload systems may include a gravity-independent thermal payload system for enabling melt or cooling of a sample under various gravity levels, such as microgravity. Alternatively, or in addition, the payload systems may include a hypergravity crystallization payload system configured to enable crystallization of a chemical substance under hypergravity. Alternatively, or in addition, the payload systems may include a gravity-independent crystallization system configured to enable crystallization of a chemical substance in various gravity levels, such as microgravity.

A method for preparing metallic magnesium and industrial silicon by decomposing serpentine with hydrochloric acid is provided. Serpentine is used as a raw material, and is processed by a two-stage countercurrent leaching process in a hydrochloric acid system. A hydrometallurgical process is adopted, including beneficiation, wet grinding, slurry storage, filtration, two-stage atmospheric pressure hydrochloric acid leaching, washing and filtration of leached silica slag, iron removal and nickel precipitation from a leachate, separation, washing and filtration of a ferric hydroxide precipitate and a nickel hydroxide precipitate, crystallization and evaporation of a magnesium chloride solution, and hydrochloric acid preparation from a flue gas generated after thermal decomposition of magnesium chloride. The present disclosure develops a process of decomposing serpentine with hydrochloric acid and producing metallic magnesium by a drying-electrolysis method, and a process of producing industrial silicon by smelting silica slag in an electric furnace.

The present disclosure relates to a preparation system and a preparation method for high-quality xylitol crystals. The preparation system comprises a blending tank, a heat exchanger, a decolorization tank, an ion exchange system, a micropore filter, a first evaporator, a first crystallization kettle, a first centrifuge, a fluidization drying bed, a xylitol dissolution tank, a second evaporator, a second crystallization kettle, a second centrifuge, a hot air drying tank, and a cold air fluidization bed which are sequentially connected through pipelines. The first centrifuge is also connected with the blending tank through a pipeline. The second centrifuge is also connected with the xylitol dissolution tank through a pipeline. The blending tank is provided with an inlet for a xylitol hydrogenation solution. The xylitol dissolution tank is provided with a water inlet for purified water. A material output from the cold air fluidization bed is a xylitol crystal product. The first prepared xylitol crystals are dissolved by adding water in a certain proportion to obtain a xylitol solution with a higher purity, which is recrystallized to prepare xylitol crystals with higher pH and better flavor.

A method of manufacturing a particulate transition metal carbonate material. A transition metal precursor salt in a liquid vehicle is mixed with a carbonate salt and / or a bicarbonate salt, and a preci

The invention discloses 2, 4-dihydroxybenzoic acid dissolving and recrystallizing equipment which comprises a closed dissolving kettle, a crystallization kettle and a mother liquor storage tank, the closed dissolving kettle, a first separator, a first filtrate storage tank and the crystallization kettle are sequentially connected, and a discharge port of the crystallization kettle is connected with a feed port of a second separator; a filtrate outlet of the second separator is connected with a liquid inlet of a second filtrate storage tank, a liquid outlet of the second filtrate storage tank is communicated with a liquid inlet of the mother liquor storage tank through a third pipeline, and a second pipeline between the first separation column and the second pump body is communicated with a liquid outlet of the mother liquor storage tank through a fourth pipeline; the second pipeline between the second pump body and the fourth pipeline is communicated with one end of a backflow pipeline, and the other end of the backflow pipeline is communicated with the first pipeline. The 2, 4-dihydroxy benzoic acid dissolving and recrystallizing equipment disclosed by the invention can be used for preparing 2, 4-dihydroxy benzoic acid with the purity of 99.68%, and the content of metal ions is reduced to 0.15 ppm.

The invention relates to a method of forming a co-crystal, the method comprising forming a droplet comprising a first liquid and a second liquid; wherein the first liquid comprises a chemical molecule, or a salt thereof, and a co-former, or a salt thereof, and the second liquid is an oil. The invention also relates to a method of screening for co-crystals of a chemical molecule, or salt thereof, the method comprising said method of forming a co-crystal.

Compositions and methods are provided for producing crystalline forms of organic acids or salts or lactones thereof from an aqueous solution. More specifically, methods are provided for producing a crystalline form of a salt of mevalonic acid (also referred to as X-MVA) from an aqueous solution, comprising subjecting the aqueous solution comprising said X-MVA to a purification step to produce a purified solution and crystallizing said X-MVA from said purified solution by water solvent crystallization. Methods are also provided for producing mevalonolactone from an aqueous solution comprising X-MVA, comprising subjecting the aqueous solution comprising said X-MVA to cation exchange thereby converting said aqueous solution comprising X-MVA to an aqueous solution comprising mevalonolactone (MVL). Methods are also provided for producing mevalonolactone monohydrate crystals.

It is an object of the present disclosure to provide a method for producing a reduced coenzyme Q 10 Form II crystal or a crystalline solid thereof, which is capable of stably producing a reduced coenzyme Q10 Form II crystal or a crystalline solid thereof. The present embodiment is a method for producing a reduced coenzyme Q10 Form II crystal or a crystalline solid thereof, the method using a crystallizer provided with a crystallization unit, a turbidity detection unit capable of detecting a turbidity in the crystallization unit, and a temperature adjustment unit capable of adjusting a temperature in the crystallization unit, and the method including: accommodating a mixed solution containing an alcohol and a reduced coenzyme Q10 in the crystallization unit; adding a reduced coenzyme Q10 Form II crystal as a seed crystal to the mixed solution; and precipitating a reduced coenzyme Q10 Form II crystal in the mixed solution after adding the seed crystal, wherein the precipitation includes controlling a temperature with the temperature adjustment unit based on a turbidity change rate obtained by the turbidity detection unit.

The invention relates to a continuous method for obtaining a crystalline monosaccharide, comprising: continuous crystallization of the monosaccharide in a main crystallizer (10), wherein crystallization by evaporation and / or crystallization by cooling is carried out continuously on a crystal suspension in the main crystallizer in order to allow crystals of the monosaccharide to grow in the crystal suspension; separation of crystals of the monosaccharide out of the crystal suspension to obtain crystalline monosaccharide; continuous formation of a mass of crystallization magma for the main crystallizer (10) in a cascade, wherein the cascade comprises at least one first stage (13) and a final stage (15) connected in series and each stage comprises at least one pre-crystallizer (13A, 15A), wherein, in the at least one pre-crystallizer (13A) of the first stage (13), a solution is seeded with monosaccharide by means of monosaccharide seed crystals in order to obtain a pre-crystallization magma, and a mass of crystallization magma for the downstream stage (14, 15) is formed from the pre-crystallization magma by means of crystallization by cooling and / or crystallization by evaporation, and wherein a solution containing monosaccharide and a mass of crystallization magma from the upstream stage is supplied to the at least one pre-crystallizer (15A, 15B, 15C) of the final stage (15) to obtain a pre-crystallization magma, and in the at least one pre-crystallizer (15A, 15B, 15C) of the final stage (15) a mass of crystallization magma for the main crystallizer (10) is formed from the pre-crystallisation magma by means of crystallization by cooling and / or crystallization by evaporation; the continuous supply of a solution containing the monosaccharide and a mass of crystallization magma from the at least one pre-crystallizer (15A, 15B, 15C) of the final stage (15) of the cascade to the main crystallizer (10) to provide the crystal suspension.

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.

To provide methods for producing crystalline forms of mevalonolactone from an aqueous solution comprising a salt of mevalonic acid, and compositions comprising the mevalonolactone produced.SOLUTION: Methods for producing mevalonolactone from an aqueous solution comprising a salt of mevalonic acid (X-MVA) comprise subjecting the aqueous solution comprising the X-MVA to cation exchange thereby converting the aqueous solution comprising the X-MVA to an aqueous solution comprising mevalonolactone (MVL). Methods are also provided for producing mevalonolactone monohydrate crystals.SELECTED DRAWING: Figure 1B