Hydrodynamic cavitation crystallization device and process
a technology of hydrodynamic cavitation and crystallization device, which is applied in the direction of vibration crystallization, crystallization auxiliary selection, separation process, etc., can solve the problems of low purity of materials, reduced stability, and high friability
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example 1
[0058] 30 grams of technical grade NaCl (sodium chloride-feed solution) was dissolved 100 ml of distilled water in a beaker. 200 ml of ethanol (antisolvent) (95% ethanol+5% methanol, Aldrick™) was added to the beaker with volumetric ratio of anti-solvent / feeding solution=2:1.
[0059] The solution was mixed until NaCl (sodium chloride) crystals appeared. Upon completion, the product was filtered, washed, and then dried. The crystal particle size (d 90) was 150 microns.
example 2
[0060] The crystallization process was carried out in cavitation device 400 as shown in FIG. 4 and described where device 400 is capable of operating up to 8,000 psi with a nominal flow rate of 800 ml / min. The orifice used was 0.010 inches diameter at 600 psi head pressure. Ethanol (anti-solvent) was fed, via a high pressure pump, through flow-through channel 415, while NaCl (feed solution) was introduced, via a high pressure pump, into flow-through channel 415 via port 455 upstream from orifice 450 at a 2:1 anti-solvent / feed solution ratio. The combined anti-solvent and feeding solution then passed through orifice 450 causing hydrodynamic cavitation to effect nucleation. NaCl was crystallized and discharged from cavitation device 400.
[0061] The crystal particle size (d 90) of the recovered crystalline NaCl was 30 microns.
example 3
[0062] The crystallization process of Example 2 was repeated in cavitation device 400, but at a higher hydrodynamic pressure of 3,000 psi.
[0063] The crystal particle size (d 90) was 20 microns.
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