11 results about "Crystal size distribution" patented technology

The invention discloses a crystal size distribution soft measurement method integrated with mechanism constraints. The method comprises the following steps: 1) data acquisition and integration; 2) modeling training and model testing: constructing a crystal size distribution soft measurement model integrated with mechanism constraint, training a training data set, injecting crystallization process dynamics knowledge into the Kolmogorov-Arnod network in a loss function form, improving the nonlinear modeling capability and credibility of the model, and performing model testing on the Kolmogorov-Arnod network; and verifying test set data by using the trained model. According to the method, the knowledge of the crystallization dynamic process is injected into the Kolmogorov-Arnod network in the form of the loss function, so that the prediction capability of the model on the crystal size distribution in the crystallization process and the credibility of the model are effectively improved.

The invention discloses strip-shaped flaky crystal form trans-4-(4-alkyl cyclohexyl) phenol as well as a preparation method and equipment thereof, and relates to the technical fields of an organic compound crystallization process and liquid crystal material preparation. According to the preparation method, the grain size uniformity is remarkably improved through an original eddy current enhanced crystallization and pulse type supersaturation degree regulation and control technology, and the crystal form has the characteristics of large size and high purity. According to the preparation method, integrated equipment is adopted, an eddy field and solvent pulse supplementing technology is utilized in a spiral reducing pipeline, the crystallization process is accurately controlled, the crystal size distribution is uniform, the equipment integrates temperature, centrifugation and a liquid supplementing automatic adjusting system, and ultrasonic real-time monitoring is matched, so that the high-stability strip-shaped flaky crystal can be produced; the method effectively improves the problems of low efficiency and non-uniform crystal form of the traditional process, and is especially suitable for large-scale preparation of high-precision liquid crystal display material intermediates.

This application relates to a method for preparing crystalline D-psicose. In this application, crystalline D-psicose is prepared by combining an evaporation crystallization method with a cooling crystallization method, which simplifies the preparation process, facilitates operation, and reduces crystallization time. In this application, a seed crystal is added when the solids content is relatively low (70-75%) during the evaporation crystallization process. This facilitates crystallization, uniformizes the crystal growth rate in each direction, shortens the overall crystallization time, and reduces energy consumption. After evaporation crystallization is complete, crystal shaping is carried out to achieve uniform crystal size, a smooth crystal surface, and a refined crystal form.After crystal regulation, crystallization by cooling is carried out, and the cooling frequency at specific intervals is designed based on the metastable region curve of D-psicose. Once crystallization is completed using the preparation method described in this application, the resulting crystal exhibits high yield, a narrow crystal size distribution, a smooth surface, a mirror-like surface, good reflectivity, and a regular crystal form.

The application provides a cooling and purifying device and system for isocyanate carbonylation intermediates, the cooling and purifying device comprises a cylinder body, the bottom of the cylinder body is a conical structure, a liquid outlet is arranged close to the tip of the conical structure, the cylinder body is sequentially divided into a spray granulation zone and a liquid phase washing zone along the material flow direction; the spray granulation zone comprises a granulation system and a cooling system which are sequentially arranged along the material flow direction; the liquid phase washing zone comprises a stirring system and a ventilation member which are sequentially arranged along the material flow direction, and the ventilation member is arranged in the conical structure and close to the liquid outlet. Through the specific design of the spray granulation zone and the liquid phase washing zone, the method of combining spray granulation, spray cooling and liquid phase washing of suspended particles is used, the stable control and purification of the particle size of the carbonylation molten intermediate are realized, the problems of caking and wide crystal size distribution in the rapid cooling and crystallization process are solved, and the continuous and efficient production is facilitated and the engineering scale-up is easy.

A dried, solid composition comprising a compound of the structural formula (I) is provided: wherein R2 is an alkyl group having 1 to 6 carbon atoms, and wherein the composition has a particle / crystal size distribution of 20 to 500 microns; wherein the dried solid composition has a specific cake resistance of 5×109 m / kg or less, or 4.3×109 m / kg or less; wherein the particle size ranges from 20 to 500 microns. A process for making the composition is also provided.

The present invention belongs to the technical field of battery electrolytes and relates to a continuous dynamic crystallization device for lithium hexafluorophosphate and a crystallization method thereof. The crystallization device mainly adopts a cylindrical coil crystallization device. A crystallization coil is arranged inside a crystallization cylinder so that lithium hexafluorophosphate material flows in a spiral inside the crystallization coil. Eddy currents are generated at the cross section of the crystallization coil. The formation of the eddy currents enhances radial mixing of the fluid and can reduce residence time distribution. Therefore, the particle size distribution of the generated crystals is narrower, and dynamic continuous crystallization production of lithium hexafluorophosphate can be realized, thereby obtaining high-purity lithium hexafluorophosphate crystals with uniform crystal size distribution and stable output.

The invention discloses a multi-stage temperature control rock sugar boiling device and technology for sugar preparation. The device is formed by interconnection of module processes such as dissolution and pretreatment, multi-section temperature-control boiling / concentration, vacuum collaboration, online quality sensing, seed crystal interface, crystallization interface, defoaming and degassing, energy recovery and central control and the like. According to the process, temperature-time-vacuum segmented combined control is carried out, and in-segment closed loop and inter-segment switching are realized by taking online Brix and temperature as main criteria, so that syrup is ensured to be in a target window before crystallization. According to the scheme, while the transparency, color value and crystal size distribution consistency of rock candy are improved, flavor loss and energy consumption are reduced, the method is suitable for smooth butt joint with an existing vacuum crystallization tank or crystallization tank, and formulated and traceable industrial production is achieved.

The invention discloses strip-shaped flaky crystal form alkyl cyclohexylphenol as well as a preparation method and equipment thereof, and relates to the technical fields of an organic compound crystallization process and liquid crystal material preparation. According to the invention, through the original eddy current enhanced crystallization and pulse type supersaturation degree regulation and control technology, the leapfrogging progress of grain size uniformity is realized, and the crystal form has the characteristics of large size and high purity. According to the preparation method, integrated equipment is adopted, an eddy field and solvent pulse supplementing technology is utilized in a spiral reducing pipeline, the crystallization process is accurately controlled, the crystal size distribution is uniform, the equipment integrates temperature, centrifugation and a liquid supplementing automatic adjusting system, and ultrasonic real-time monitoring is matched, so that the high-stability strip-shaped flaky crystal can be produced; the method solves the problems of low efficiency and non-uniform crystal form of the traditional process, and is particularly suitable for large-scale preparation of high-precision liquid crystal display material intermediates.

The present invention concerns a zeolitic adsorbent agglomerate comprising at least one zeolite of faujasite type comprising barium and / or potassium, of porosity between 25% and 45%, and having a standard deviation σ of crystal size distribution in said agglomerate of less than 0.30 μm.The invention also concerns the use of the zeolitic adsorbent agglomerate for the separation of hydrocarbon mixtures, and the process for separating hydrocarbon mixtures using said zeolitic adsorbent agglomerate.

The present invention relates to the technical field of perovskite film preparation, and discloses a method for crystallizing a perovskite film assisted by a controllable vapor atmosphere, comprising the following steps: (1) introducing solvent volatile gas and antisolvent volatile gas into a closed processing chamber via a carrier gas to form a mixed atmosphere in the closed processing chamber; (2) placing the spin-coated perovskite film in the closed processing chamber and allowing it to stand in the mixed atmosphere for pre-crystallization; and (3) removing the pre-crystallized perovskite film for annealing. The present invention pre-crystallizes the perovskite film in a mixed atmosphere of solvent and antisolvent, thereby regulating crystal growth kinetics, improving crystal size distribution and crystal integrity, and effectively reducing defects and impurities.

The invention provides a polyaryletherketone blend, a preparation method thereof and a thermoplastic composite material, and belongs to the technical field of high-performance thermoplastic resin. According to the invention, more than two polyaryletherketone with different melt indexes are blended to obtain the polyaryletherketone blend with wide crystal distribution and wide crystal size distribution, so that the thermoplastic composite material with good impact resistance can be subsequently prepared; by controlling the melt index range of the polyaryletherketone, the polyaryletherketone blend with low crystallization rate is obtained, and the thermoplastic composite material with small warping deformation can be obtained through subsequent preparation. The result of the embodiment shows that the crystallinity of the polyaryletherketone blend prepared by the invention is 10-40%; the crystallization rate is 1 * 10 <-4 >-1.1 min; the compression strength of the prepared thermoplastic composite material after impact is 330 MPa.