SU396116A1 - METHOD OF ISOHYDRICH CRYSTALLIZATION OF SOLUTIONS - Google Patents

Description

The invention relates to chemical physical technology. A known method of isohydric crystallization with forced circulation of the suspension and the classification of crystals. However, by a known method of singing | You can get a high-purity product, so: as a crystal, grow from highly supersaturated solutions. The purpose of the invention is to create such crystal growth conditions so that the capture of impurities from the solution is minimized. This is achieved by the fact that the crustaceans from the area of the highest supersaturation of the solution are crushed and fed to the zone of Minimal supersaturation of the solution. The drawing schematically illustrates a technical installation for carrying out the proposed method. nozzle 1 is drawn into qi of LIN-con-conic and the crystallizer enters “eoreriioo ts) 1 the circulatory mother-sucker with a pump 2 selected from the top of the crystallizer and cooled down in a high-speed refrigerator 5. The supersaturation created as a result of the splitter does not match in the equipped in the lower part of the classifying coius 4 of the mold on the na.More larger legal structures, which are in a suspended state due to the hydrolymedic conditions of the distribution of the flows in the device. As the crystals grow, the hard particles are collected: Irai in the lower 1; 1st part of the apparatus, from which they are sent to the disintegrating device 3, in which they are crushed, after which they are introduced into the middle part of the classical cone in the zone of maximum supersaturation of the solution with the help of the distributor 6. The speed of the upward flow is such that the crushed crystals continue to remain in this zone of the crystallizer, where) i there is a process of their recrystallization and deeper purification from other impurities. Due to the fact that supersaturated in the core is removed on large crystals obtained in the lower part of the classifying cone, only slight supersaturation is created in the upper zone, which allows recrystallization in a mode that provides the possibility of obtaining a cleaner product. Depending on the properties of the products being crystallized (the ability to form supersaturated solutions), the fresh solution is introduced either into the suction line of the circulation iHacoca 2 (for products capable of creating highly supersaturated solutions) or through fitting 7 (for products that create poorly permeable solutions) .

Target crystals are taken from the middle zone of the classifier into collection 8.

Subject invention

A method of isohydric crystallization of solutions with forced circulation of suspension and classification of crystals, characterized in that, in order to obtain high-purity crystals, large crystals selected from the zone of maximum supersaturation of the solution are crushed and iodine them in the minimum degree of solution.

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Threat sZE eHarastapdora. .

year

a ± 1