10results about How to "Good crystal shape" patented technology

The invention provides a preparation method of high-purity molybdenum trioxide, which belongs to the technical field of molybdenum trioxide production and comprises the following steps: S1, crushing, grinding and roasting molybdenum ore sand to obtain crude molybdenum oxide, adding the crude molybdenum oxide into a sodium hydroxide solution, heating, stirring and filtering to obtain a crude sodium molybdate solution; s2, adjusting the pH value of the crude sodium molybdate solution to 5.5-7.0, introducing the crude sodium molybdate solution into an exchange column of macroporous cation exchange resin, then adjusting the pH value of the solution to 7.0-8.5, and introducing the crude sodium molybdate solution into an exchange column filled with anion exchange resin to obtain a high-purity sodium molybdate solution; s3, excessive ammonia water is added into the high-purity sodium molybdate solution, ammonium molybdate is separated out, washing and drying are conducted, and high-purity ammonium molybdate is obtained; and S4, the high-purity ammonium molybdate is put into a rotary calcining furnace, rare earth oxide is sprayed on the inner wall of a furnace tube, and the high-purity molybdenum trioxide is prepared by adopting a calcining mode of firstly heating, then cooling and then heating. According to the invention, the purpose of producing high-purity molybdenum trioxide is realized.

This invention relates to a method for improving protein crystallization efficiency using hydrogel regulation. The method includes the following steps: mixing monomers to obtain a prepolymer solution, adding water and a photoinitiator, stirring to obtain a hydrogel precursor solution; stabilizing the obtained hydrogel precursor solution, then irradiating it with ultraviolet light to obtain a rough hydrogel; immersing the rough hydrogel in water and then drying it to obtain a dried hydrogel; preparing a buffer solution and using the prepared buffer solution to prepare a precipitant; immersing the dried hydrogel obtained in the previous step in the prepared precipitant to swell the dried hydrogel, washing and drying it to obtain a target hydrogel; dissolving the protein in the prepared buffer solution to obtain a protein solution; and dropping the obtained protein solution onto the surface of the obtained target hydrogel to crystallize it to obtain protein crystals. Compared with existing technologies, this invention can effectively solve the problem of low efficiency in protein crystallization while ensuring the quality of protein crystals.

The present invention provides a low sodium salt and a preparation method thereof, the preparation method comprising the following steps: mixing primary brine with potassium-containing minerals, dissolving to obtain brine; clarifying the brine to obtain purified brine; evaporating and crystallizing the purified brine, controlling the brine temperature to 60°C to 100°C, and stirring intensity to 0.5m / s to 1.5m / s; when the evaporation water loss rate of the solution reaches 20% to 50%, stopping evaporation and crystallization, and separating the solid and liquid; heat-insulating and centrifuging the separated solid to obtain a wet solid phase; drying the wet solid phase to obtain the low sodium salt. The preparation method of the present invention has low production cost, controls the nucleation and growth of crystals through reasonable process conditions, and the potassium chloride content in the obtained low sodium salt is controllable, the product has good uniformity, the potassium chloride content in the product has a small fluctuation range, and the crystal size and shape are good.

The invention discloses a preparation method of abamectin wet powder, which comprises the following steps: dissolving an abamectin crude product by using methanol, carrying out concentration control, cooling and crystallizing, continuously dissolving and concentrating a secondary refined product by using methanol for further purification, slowly cooling at a low rotating speed to complete crystallization, carrying out filter pressing, and drying to obtain the abamectin wet powder. Continuously dissolving and concentrating a secondary refined product obtained after filter pressing by using methanol, purifying again, slowly cooling at a low rotating speed to complete crystallization, then carrying out filter pressing, continuously dissolving a secondary refined product obtained after filter pressing by using methanol, adding carbon, filtering and decolorizing, and slowly cooling at a low rotating speed to complete crystallization; and carrying out mother liquor filter pressing, stirring and washing and negative-pressure constant-temperature drying on the obtained filtered crystallization liquid to obtain an abamectin wet high-quality product with flowability. The production process provided by the invention effectively solves the problems of strong adhesiveness, small crystal and poor crystal form of the wet high-quality abamectin material, ensures that the flow velocity is stable, wall adhesion and caking are avoided when the wet high-quality abamectin material is used in subsequent automatic feeding and discharging equipment, and can effectively improve the production efficiency.

The application discloses a titanium gypsum solidification material and an environmental risk assessment method thereof. The titanium gypsum solidification material is obtained by mixing titanium gypsum produced in a titanium dioxide production process and red mud produced in an aluminum production process according to a weight ratio of 1:4-8 to form a titanium gypsum-red mud composite base material, and then performing reinforcing treatment on the titanium gypsum-red mud composite base material to obtain titanium gypsum-red mud composite granular material, and then mixing the titanium gypsum-red mud composite granular material with cement according to a weight ratio of 3:1-5. The titanium gypsum solidification material can realize waste resource utilization of the titanium gypsum and the red mud, realizes waste treatment by waste, and solves the problem of poor concrete compatibility of the titanium gypsum as cement ingredients, and provides a new high-strength material for roadbed material selection.

The invention discloses a preparation method of D-allose, and relates to the technical field of D-allose production, after a D-allose conversion solution is subjected to centrifugation, decoloration, desalination, concentration, chromatographic separation and re-concentration, ethanol is added in batches for segmented cooling crystallization, suction filtration and ethanol washing to obtain white crystals, and the white crystals are dried to obtain the D-allose. The production cost is reduced, the obtained product is good in crystal form, and the product quality is improved.

The invention discloses a method for producing IMP+GMP by anti-solvent cooling crystallization based on solvent spray concussion, raw materials IMP and GMP are added to the water of crystallization kettle, heated and stirred to completely dissolved, and pH is adjusted; Anti-solvent is added dropwise, crystal seeding is added, and the temperature is lowered; Solvent water forms a fan-shaped water mist through a shower head and sprays on the raw material liquid surface of crystallization kettle, and the solvent water consumption of a solvent spray concussion is 25% to 50% of the total solvent amount, and a spray time is controlled to be 1 to 2min, and the speed of stirring to heating and stirring is restored, and the temperature is lowered to form a solvent spray concussion; Repeat solvent spray concussion 2‑4 times; Cooling and filtering, washing, drying, and obtaining crystallized product. Product of the present invention has narrow particle size distribution, large particle diameter, and good crystal form, high yield, easy control of operating conditions, improved according to factory process, and strong operability.

The invention relates to the technical field of adhesive tapes, and particularly discloses a high-temperature-resistant polyamide adhesive tape and a preparation method thereof. The high-temperature-resistant polyamide adhesive tape is prepared from the following raw materials: 80 to 100 parts of dimer acid type polyamide; 10 to 15 parts of organic silicon resin; 3 to 6 parts of benzoyl peroxide; 8 to 15 parts of halogen doped ZnO2 powder; 5-10 parts of a filler; 2-5 parts of an antioxidant; and 2-5 parts of a defoaming agent. According to the polyamide adhesive tape, the halogen-doped ZnO2 powder is introduced as a key additive, the thermal stability of the polyamide adhesive tape is improved by changing the energy band structure of ZnO2, free radicals on a polyamide molecular chain are effectively captured, thermal oxidative degradation is delayed, and therefore the high-temperature resistance of the polyamide adhesive tape is remarkably improved.

The invention discloses a method for producing potassium sorbate by liquid-liquid neutralization reaction and continuous cooling crystallization, and belongs to the field of chemical industry. The present invention dissolves sorbic acid in a mixed solvent to obtain a sorbic acid solution, and pumps the sorbic acid solution and potassium hydroxide or potassium carbonate aqueous solution into a neutralization reactor for neutralization reaction to obtain a potassium sorbate solution, and then pumps the potassium sorbate solution into a two-stage crystallization reactor for continuous cooling crystallization, and finally the crystallized tide product potassium sorbate is dried to obtain a potassium sorbate finished product, wherein the mixed solvent is a mixed solvent composed of one or two of ethanol or acetone and water, and the concentration of ethanol or / and acetone is 10%-80%. The present invention dissolves sorbic acid in a solution and reacts liquid-liquid with a potassium hydroxide solution, and the mixing is more uniform and the reaction is easy to control, and the potassium sorbate crystals in the obtained potassium sorbate finished product are regular granular, with a content of ≥99.8% and a transmittance of ≥98.5%.

The present invention belongs to the technical field of industrial crystallization, and discloses a process for preparing D-tagatose crystals, which specifically includes the following steps: (1) under the assistance of ultrasound, after adding a seed solution to a saturated D-tagatose solution, the crystals are grown at 50-60°C; wherein, in the process of growing the crystals, materials are added while evaporating and concentrating; (2) after adding hydroxypropyl methylcellulose to the D-tagatose solution obtained in step (1), cooling and crystallizing are performed under infrared spectroscopy; (3) after filtering the D-tagatose solution obtained in step (2), a first filter residue and a filtrate are obtained, ethanol is added to the filtrate to continue crystallization, and then centrifuged to obtain a second filter residue, wherein the first filter residue and the second filter residue are D-tagatose crystals. The method of the present invention shortens the crystallization cycle, has a high yield, and the obtained product has high purity, good fluidity, stable quality, and is suitable for food industry production.