Method of using ultrasound to promote crystallization of solid s

Details Method of using ultrasound to promote crystallization of solid s Method of using ultrasound to promote crystallization of solid s

1996-07-15

1998-11-03

Garrett, Felisa

Chemical apparatus and process disinfecting, deodorizing, preser

Physical type apparatus

Crystallizer

117914, 422251, 422254, B01D 900

Patent

active

058304185

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates generally to the crystallization, is the solidification and/or separation, of solid substances that are contained in a melt or present in the form of a supersaturated solution.
Devices and methods for cooling and solidifying melts or supersaturated solutions have been known for a long time. The melt or supersaturated solution is dispensed in this case onto a take-up drum, which should be cooled if possible, or onto a receiving conveyor belt in a manner such that the solidified substances become deposited on the take-up drum or the conveyor belt in the form of a web of suitable thickness, which web of can then be broken into pieces of suitable size, if desired. Alternatively, the delivery onto the take-up drum or the conveyor belt could be effected in portions i.e., intermittently, which results in the formation of pellets that are easier to handle. Similarly, dispensing onto the take-up drum of the conveyor belt may be effected in strips, in which case the solidified substances will be available in the form of strips that can be cut easily to the desired lengths. Examples of methods of this kind, and of devices used for this purpose, are described in commonly owned U.S. Pat. No. 4,279,579, No. 4,610,615 and No. 5,013,498 by the assignee of record.
Further, it has been known from Skrebowski et al. U.S. Pat. No. 3,513,212 and European Publication No. 0 054 328 to employ ultrasound for the initiation and /or acceleration of crystallization processes in melts or solutions.
In the case of the known procedures for crystallizing and/or solidifying supercooled melts or supersaturated solutions it has, however, been found to be a problem to achieve such crystallization or solidification on the take-up drum or the receiving conveyor belt at exactly the desired and required point in time, or to achieve a sufficiently progressed or complete crystallization or solidification of the dispensed melt or solution on the take-up drum or the receiving conveyor belt within short periods of time.
It is, therefore, an object of the present invention to overcome the before-mentioned disadvantages and to enable the different melts or solutions to be crystallized or solidified under exactly adjusted conditions in terms of time and quantity.


SUMMARY OF THE INVENTION

This object is achieved by a procedure according to the invention, wherein the method for initiating and/or accelerating and/or directing the crystallization or separation of solid substances in supercooled melts or supersaturated solutions of solid substances comprises exposing the supercooled melt or supersaturated solution to ultrasound either prior to the melt or solution being dispensed onto a take-up member such as a drum or a conveyor belt of a conveyor system, or after being dispensed onto the take-up member.
Examples of melts or solutions, to which the invention may be applied, are solutions of CaCl.sub.2, MgCl.sub.2 and Al.sub.2 (SO.sub.4).sub.3 and melts of wax or sulfur. The melts or solutions may additionally contain suspended substances. The melts or solutions may also be multi-component systems. The maximum temperature of such melts or solutions is, preferably, 500.degree. Centigrade, in particular 350.degree. Centigrade.
The statement "prior to being dispensed onto the" as used herein means that the melt or solution is exposed to the action of ultrasound before the supercooled melt or the supersaturated solution emerges from the dispensing device always present in such conveyor systems or drum systems, i.e. normally a short time before it emerges into the air gap between the dispensing device and the conveyor belt or take-up drum.
The statement "after being dispensed onto a take-up member" as used herein means that ultrasound is caused to act upon the conveyor belt or the take-up drum. This may be achieved, for example, by suitably coupling known or commercially available ultrasound sources with the conveyor belt or the take-up drum. Further, it is also a matter of course that the power of such

REFERENCES:
patent: 3513212 (1970-05-01), Skrebowski et al.
patent: 4249826 (1981-02-01), Studievic et al.
patent: 4279579 (1981-07-01), Froeschke
patent: 4443412 (1984-04-01), Schermutzki et al.
patent: 4610615 (1986-09-01), Froeschke
patent: 5013498 (1991-05-01), Froeschke
patent: 5395593 (1995-03-01), Martin

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