Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D9/00—Crystallisation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
  • B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
  • B01J19/10—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing sonic or ultrasonic vibrations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D9/00—Crystallisation
  • B01D9/0004—Crystallisation cooling by heat exchange
  • B01D9/0013—Crystallisation cooling by heat exchange by indirect heat exchange
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D9/00—Crystallisation
  • B01D9/005—Selection of auxiliary, e.g. for control of crystallisation nuclei, of crystal growth, of adherence to walls; Arrangements for introduction thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
  • B01J2/20—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by expressing the material, e.g. through sieves and fragmenting the extruded length
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
  • Y10S117/914—Crystallization on a continuous moving substrate or cooling surface, e.g. wheel, cylinder, belt

Definitions

• the invention relates to the field of solidification and / or separation of solid substances which are in a melt or are present as a supersaturated solution.
• melt and supersaturated solutions are applied to a cooling drum or a receiving conveyor belt that is as cooled as possible so that the solidified substances are deposited on the receiving drum or on the conveyor belt in the form of a web of suitable strength, this web then being separated from solidified substances can optionally be broken into pieces of a suitable size.
• It is preferably dispensed onto the take-up drum or the conveyor belt in portioned form, pastilles being formed which are easier to handle. It is also possible to dispense it onto the take-up drum or the conveyor belt in the form of strips, in which case strips of the solidified material are obtained which can easily be cut to suitable lengths.
• Such methods and the devices used for this purpose are described, for example, in DE 29 41 802 C2, DE 34 21 625 C2 and DE 38 13 756 Cl.
• the solution according to the invention is used to solve the problem, in which the method for initiating and / or accelerating and / or directing crystal formation or solid deposition in supercooled melts or supersaturated solutions of solid substances by the action of ultrasound on the supercooled melt or supersaturated solution before delivery is applied to a conveyor belt of a belt system or when recording on a conveyor belt of a belt system or before delivery to a take-up drum or when recording on a take-up drum.
• Melting or solutions to which the invention can be applied are e.g. B. Solutions of CaCl 2 , MgCl 2 and Al2 (20) 3 and melting of wax or sulfur.
• the melts or solutions can also additionally contain suspended substances.
• Melting or solutions can also be multi-component systems.
• the maximum temperature of such melts or solutions is advantageously 500 ° C., in particular 350 ° C.
• before delivery onto a conveyor belt of a belt system or onto a take-up drum means that the ultrasound before the undercooled melt or the supersaturated solution emerges from the delivery system which is always present in such a belt system or drum system device is allowed to act on the melt or solution, ie usually only shortly before it emerges in the between the dispenser and conveyor belt or take-up drum air gap always present.
• the ultrasound is allowed to act on the conveyor belt or the take-up drum.
• This can e.g. B. by means of suitable coupling of known and commercially available ultrasound sources to the conveyor belt or the take-up drum. It is also a matter of course that the output of such ultrasound sources is adapted to the existing output or the throughput of the melt or solution and its material composition. However, this can be determined without any special effort using simple preliminary tests.
• Figure 1 is an overall view of a solidification system with a conveyor belt as a receiving device and the action of ultrasound on the melt or solution.
• FIG. 2 shows an overall representation corresponding to FIG. 1, but only a partial flow of the melt or solution is subjected to the action of ultrasound;
• FIG. 3 shows an overall representation of a solidification system with a receiving drum as the receiving device and the effect of the ultrasound on the melt or solution;
• Fig. 4 shows a detailed representation of the device
• FIG. 5 is a sectional view of an ultrasonic source installed in a piping system
• FIG. 6 shows a partial view for coupling the ultrasound source to a conveyor belt
• Fig. 8 is a schematic representation of the arrangement of a
• Fig. 9 is a schematic representation of an arrangement with the action of ultrasound from several sides.
• 1 shows an overall system for the crystallization or solidification of solid substances from the melt or from the solution.
• 1 denotes a heatable and coolable container which is expediently provided with a stirrer and in which the melt or solution is located, the melt being able to be cooled in the desired manner therein.
• 2 with a control and conveying device for controlled delivery from the container 1 is designated.
• the melt or solution can be brought further to the desired and required temperature by the subcooler 3.
• 4 denotes the device for the action of ultrasound, which can be a commercially available ultrasound source installed in a section of the connecting pipes 5.
• ultrasound sources are e.g. B.
• the melt or solution is dispensed onto the conveyor belt 8 of the belt system A, which can be done in a portioned manner or in the form of strips or layers if the dispensing device 7 is suitably designed.
• the belt system A comprises the guide and movement rollers 9, 9 'for the conveyor belt 8, the stripping device 10 for stripping the melt or solution applied to the conveyor belt 8 and solidified thereon, an optional device for coating the conveyor belt 8 with a non-stick agent and the Device for cooling the conveyor belt 8 consisting of a trough 11 for cooling liquid, a cooling device 12 and a pumping device 13.
• FIG. 2 shows an overall system corresponding to FIG. 1, but only a partial flow from here
• Ultrasound is applied to container 1 coming melt or solution.
• FIG. 3 shows an overall system corresponding to FIG. 1, but here a take-up drum is used instead of the belt system for receiving the melt or solution discharged from the dispensing device 7.
• the take-up drum 15 picks up the melt or solution and is otherwise cooled by a device corresponding to FIG. 1.
• FIG. 4 shows in more detail the arrangement of a bypass section in order to apply ultrasound only to a partial flow.
• the ultrasound source is again designated 4
• an upstream cooling section 16 is arranged upstream of it, which corresponds to the subcooler 3 of FIG. 1.
• the arrangement shown still includes the valves 17, 17 'and 17 ".
• FIG. 5 shows a sectional view with an ultrasound source 4 built into the piping system (not shown) by means of a bend 17, in particular a glass bend.
• 18 and 19 denote the connecting flange or the connecting piece of the ultrasound source 4.
• 6 shows the embodiment of the invention in which the ultrasound is applied only after the melt or solution has hit a conveyor belt 8.
• the conveyor belt 8 is cooled here, as in the illustration shown in FIGS. 1 and 2, by means of the liquid in the trough 11, the conveyor belt 8 having to touch the surface of the cooling liquid in the trough 11. This can be done in a simple manner by means of suitable pressing devices or by spraying the cooling liquid against the conveyor belt 8 from below.
• the ultrasound source 4 is arranged in the cooling liquid in the trough 11, which ensures a perfect coupling.
• FIG. 7 schematically shows an arrangement in which the ultrasound acts not only at one point but in succession at two points by means of the ultrasound transmitters 20 and 21. This enables multiple nucleation at intervals from one another.
• FIG. 8 is a sectional view of the arrangement of an ultrasound source 4 installed in a piping system, which corresponds to that of FIG. 5, but here an ultrasound reflector 22 is opposite the head 23 of the ultrasound transmitter, whereby reflection of the ultrasound can take place and thus a higher yield on used ultrasound can be achieved.
• FIG. 9 An arrangement is schematically shown in FIG. 9, in which, at one point, multiple sonication is carried out by three ultrasound sources 24, 25 and 26.
• This has the advantage that the ultrasound transmitter can be operated with low power and yet an increased effect can be achieved in a defined, relatively small space. This makes it possible to bundle or focus the ultrasound power in a small space or volume.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Crystallography & Structural Chemistry (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Health & Medical Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Toxicology (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Physical Or Chemical Processes And Apparatus (AREA)
• Ink Jet (AREA)
• Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=6527646

Family Applications (1)

Country Status (10)

Families Citing this family (9)

Family Cites Families (10)

• 1994
  • 1994-09-07 DE DE4431872A patent/DE4431872C1/de not_active Expired - Fee Related
• 1995
  • 1995-08-25 WO PCT/EP1995/003363 patent/WO1996007461A1/de not_active Application Discontinuation
  • 1995-08-25 JP JP8509166A patent/JP2860605B2/ja not_active Expired - Lifetime
  • 1995-08-25 US US08/640,872 patent/US5830418A/en not_active Expired - Fee Related
  • 1995-08-25 CN CN95190866A patent/CN1135186A/zh active Pending
  • 1995-08-25 EP EP95931203A patent/EP0726800A1/de not_active Withdrawn
  • 1995-08-25 KR KR1019960702132A patent/KR960705610A/ko not_active Application Discontinuation
  • 1995-08-25 CA CA002174448A patent/CA2174448A1/en not_active Abandoned
  • 1995-08-25 AU AU34731/95A patent/AU681544B2/en not_active Ceased
  • 1995-08-25 RU RU96112187A patent/RU2117512C1/ru active

Non-Patent Citations (1)

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