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CE 520: Cooling Crystallisation

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Cooling Crystallisation

Product Details

Technical Description
This experimental unit has been developed in conjunction with the Institute of Thermal Process Engineering at the Martin-Luther University, Halle-Wittenberg. A saturated solution is added to the storage tank and a pump delivers most of this solution into the main circuit. This circulating solution is heated above saturation temperature using a heat exchanger and a heating water circuit to prevent premature crystallisation. A valve is used to feed a small amount of the solution through the crystallisation cell. This part of the solution is cooled below saturation temperature to induce crystallisation. The crystallisation cell is a tube with screens at both the inlet and outlet. The cell can be opened to allow the addition of crystals as crystallisation nuclei. The mesh size of the screens is selected to prevent the crystals from escaping from the cell. The flow conditions create a fluidised bed in the cell, in which crystal growth occurs. The level of growth can be determined by weighing the crystals before and after the experiment. Potassium sulphate is recommended as the experimental material of choice. A screening machine and a microscope can be used for evaluation.

Learning Objectives / Experiments
- Investigation of crystal growth: with different solutions, at different temperatures, depending on tim

* Crystallisation from solutions
* Investigation of crystal growth in a fluidised bed
[1] Crystallisation from solutions in fluidised bed
[2] Removable and fillable acrylic glass crystallisation cell with screens
[3] Stored solution in glass tank and circulation with centrifugal pump
[4] Valve to devide solution into circulating flow and flow to crystallisation cell
[5] Heating of circulating flow above saturation temperature using heat exchanger and heating water circuit
[6] Cooling of solution to induce crystallisation using heat exchanger and cooling water circuit
[7] Heating water circuit with centrifugal pump, electric heater and thermostat

Technical Data
1 storage tank: volume: approx. 25L
2x heater with thermostat: power output: approx. 1kW
Temperature measuring range: 5x 0...60°C

Dimensions and Weight
l x w x h : approx. 2000 x 800 x 1800 mm
Weight : approx. 150 kg

230V, 50Hz, 1 phase

Scope of Delivery
1 experimental unit, 1 digital scale, 1 stopwatch, 1 set of instructional material

Order Details
083.52000  CE 520  Cooling Crystallisation

SELKA GmbH, Hamburg
Grindelallee 188, 20144 Hamburg / Germany
Tel.: + 49 (0) 40 343453 |  Fax: +49 (0) 40 63657075
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