JPH02277503A - Pressure-type freeze concentrator - Google Patents

Abstract

PURPOSE:To carry out efficient recovery by connecting a pressure cylinder having a tapered hole to the lower part of a cooling cylinder and connecting a drain pipe to the tapered hole. CONSTITUTION:A soln. injected into the cylinder is frozen by the cooling medium flowing in an upper jacket 14 and tightly combinded with a tensile wire 8. The ice crystal is passed through the cylinder along with the wire, introduced into the pressure cylinder 3, compressed by the inner surface of the tapered hole of the pressure cylinder and pressurized. The freezing point of the ice crystal is lowered by the pressurization, and the part of the ice crystal having a high content of a solute is melted. Since the outer surface of the ice crystal is out of contact with a guide groove 21, pressure is not produced, the guide groove forms the low-pressure region in the tapered hole, and the liq. concentrate flows into the guide groove 21 along the surface of the tapered hole. The liq. concentrate is discharged to the outside of the concentrator from a drain pipe 20 and recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pressurized freeze-concentrator for producing various beverage liquids, medicinal liquids, and other am liquids.

[Prior art and its disadvantages] A mother liquor for concentration is once frozen, and a concentrated solution rich in solutes is selectively separated from the ice crystals by pressurizing the ice crystals of the frozen mother liquor. There is a way to get it.

In other words, due to the different freezing points of the solvent and solute,
Since ice crystals contain solvent crystals and a highly concentrated solution trapped between the crystals, a concentrated solution is obtained by extracting this highly concentrated solute-rich solution.

For this purpose, a pressurized freezing device is used, which lowers the freezing point of the solvent by pressurizing the ice crystals, melts the solvent crystals without applying heat of fusion, and efficiently extracts the concentrated liquid trapped within the crystals. It will be done.

The concentrated liquid thus removed has a relatively low lJ prison point and is difficult to freeze, but the solvent released from pressure easily refreezes, so the molten solvent is absorbed into the concentrated liquid. This prevents the concentration of the concentrate from diluting to the level of the mother liquor.

However, since the concentrated liquid separated from the ice crystals in this way also contains a solvent, the concentrated liquid flows along the fine gap between the pressure surface of the pressure mechanism and the outer surface of the ice crystals to the low pressure side ( When moving upward (when pressurizing from top to bottom), the concentrated liquid may stagnate due to uneven pressurization and may be cooled and frozen by the outer surface of the ice crystals and the inner surface of the tapered hole. In addition, in order to quickly move the concentrated liquid to the concentrated liquid recovery section, the pressurization pressure must be increased, so that it cannot be said that the concentrated liquid is recovered efficiently.

[Purpose] The present invention aims to improve the processing capacity of concentrated liquid from ice crystals.
It is possible to provide a pressurized freezing and concentrating device that has a mechanism in which ice crystals are lowered by a tensile wire and can efficiently recover a concentrated liquid separated from the ice crystals by applying pressure.

[Means] In order to achieve the above object, the pressurized freeze concentrator according to the present invention includes a pressurizing cylinder having a tapered hole at the bottom of the vertical cooling cylinder to which the mother liquor for concentration is supplied. A drain pipe for recovering the concentrated liquid is connected to the tapered hole at an appropriate position above the taper hole, and an endless tensile wire for pulling ice crystals is routed through the cooling cylinder and the pressurizing cylinder. A guide groove is formed in the inner surface of the taper hole, one end of which communicates with the opening in the taper hole of the drain pipe.

[Function] The ice crystals pulled downward by the tensile wire are pressurized as they pass through the tapered hole, and the concentrated liquid is separated from the ice crystals.

The concentrated liquid flows along the inner surface of the tapered hole to the nearby guide groove on the low-pressure side, and the concentrated liquid in the guide groove is successively pushed upward by the subsequent concentrated liquid flowing into the guide groove, and then flows out from the drain pipe. guided out of the device.

[Embodiment M] An embodiment of the present invention will be described with reference to a specific example shown in the accompanying drawings.

FIG. 1 is an overall view of the apparatus according to the present invention, in which a pressurizing cylinder 3 having a tapered hole serving as a pressurizing portion is connected to the lower part of a vertical cylinder 2 serving as a cooling portion having a mother liquid container l at the top. The cylinder 2 and the pressurizing cylinder 3 are both 7 langes 4.5
They are connected by interposing a heat insulating material 6 between them.

Note that the mother liquor container 1 and the cylinder 2 are connected, for example, by a cylindrical body 1b having a funnel-shaped hopper portion 1a at its upper part.

Further, a tank 7 having a drain valve V at the bottom is provided at the bottom of the pressurizing cylinder 3, and a tensile wire 8 such as a wire rod 8, which is endlessly fed, is passed from a hole at the bottom of the mother liquor container l to the cylinder 2, It passes through the pressurizing cylinder 3 and enters 4!17, is reversed upward by the inner wheel 9, is driven by the drive wheel IO, and is sent from the supply wheel 13 via the intermediate guide wheels 11 and 12 to the mother liquor container 1 as described above. ．． It is designed to be sent to cylinder 2.

The cylinder 2 has two cooling parts (upper and lower).
14 and 15 are provided, +8a and lea indicate inlets for each cooling medium, and 18b and 17b indicate respective outlets.

Further, the pressurizing cylinder 3, which is a pressurizing body, is also provided with a jacket 18, and reference numerals 111a and 19b indicate respective inlets and outlets for fluid.

A drain pipe 20 for recovering concentrated liquid is connected to the upper surface 2 of the pressurizing cylinder 3, that is, the upper part of the tapered hole.

Furthermore, a spiral guide V1121, for example, is provided on the inner surface of the tapered hole, and this guide 111
One end of 121 communicates with the opening in the tapered hole of the drain pipe 2o.

In addition, guide grooves provided on the inner surface of the tapered hole are shown in Figure 3 (
As shown in a), multiple spiral guide grooves 21a
Alternatively, as shown in FIG. 3(b), the guide groove 21b may be formed of a large number of vertical grooves.

The upper end of each guide groove and the opening in the tapered hole of the drain pipe 2° are communicated with each other via a pocket 22a for a liquid reservoir, as shown in FIG. 3(a), and as shown in FIG. 3(b). An annular groove 22b provided along the inner circumference of the tapered hole as shown in FIG.
In some cases, communication may be made via a .

In the pressurized freeze concentrator configured as described above, when an appropriate amount of mother liquor for concentration is supplied to the mother liquor container 1 using, for example, a pump P, the solution overflows from the hopper part Ia and flows along the inner wall surface of the cylinder via the cylinder 1b. It is washed away.

At this time, a cooling medium capable of lowering the temperature of the inner wall surface of the cylinder to below the freezing point of the mother liquor for concentration is made to flow through the lower cooling jacket 15 of the cylinder.

By doing this, the solution flowing down the inner wall surface of the cylinder little by little is cooled by the cooling medium flowing through the lower jacket and quickly freezes into ice 23, and the solution flowing on the surface is also sequentially frozen and ice grows. Eventually, the lower part of the cylinder becomes blocked by ice.

After this blockage, the cooling refrigerant is also flowed into the upper jacket 14 of the cylinder according to a command from a timer, for example, and the capacity of the pump P is increased so that the amount of solution discharged can always fill the cylinder with solution. It is.

The solution injected into the cylinder is frozen by the cooling medium flowing inside the upper jacket 14, and becomes ice crystals that are firmly bonded to the tensile wire 8.

The tensile wire 8 is driven to descend within the cylinder 2,
This also causes ice crystals to fall.

The ice crystals that have passed through the cylinder together with the tensile wire first enter the pressurizing tube 3, where they are squeezed and pressurized by the inner surface of the tapered hole of the pressurizing tube.

This pressurization lowers the freezing point of the ice crystals, causing the ice crystals to melt starting from the areas where the solute concentration is high, and the melted concentrate moves from areas where the pressure applied to the ice crystals is high to areas where the pressure is low.

Therefore, the guide %121 drilled on the inner surface of the tapered hole
Since the outer surface of the ice crystals is not in contact with the guide groove 21, no pressure is generated, and the guide groove becomes a low-pressure area within the tapered hole, and the concentrated liquid flows into the guide groove 21 along the surface of the tapered hole.

The concentrated liquid separated from the ice crystals flows into the guide groove 21 at any time, so that the concentrated liquid in the guide groove is successively pushed up and guided out of the apparatus from the drain pipe 20 into a recycling container (not shown). etc. will be collected.

[Effect] As explained above, according to the pressurized freeze-concentrator according to the present invention, the concentrated liquid separated from the ice crystals by pressurization flows into the guide groove on the inner surface of the tapered hole, which is the low-pressure part, and flows into the guide groove. Since the concentrated liquid is guided along the guide groove to the drain pipe, the concentrated liquid can be efficiently collected, and since the concentrated liquid is sequentially supplied into the guide groove, a flow at an almost constant speed is created in the guide groove toward the drain pipe. , prevents the concentrate from freezing due to stagnation.

In addition, since the concentrated liquid separated by pressurization flows into the guide groove in the vicinity of the low-pressure part, there is no need for a large amount of pressurizing force to push the concentrated liquid directly into the inlet of the drain pipe.
Sufficient concentrated liquid can be recovered with a smaller pressure than conventional methods.

In the above embodiment, the mother liquor for concentration was supplied from the upper mother liquor tank into the cooling cylinder, and the mother liquor was frozen in the cylinder to form ice crystals that bonded to the tensile wire. It is not limited to this.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a pressurized freeze-concentration apparatus according to the present invention, FIG. 2 is a partially enlarged longitudinal sectional view, and FIG. 3 is an enlarged longitudinal sectional view showing another embodiment of the pressurized cylinder. be. Figure Medium Φ Red mother liquor container +a...Hopper part 1b--Cylinder body 2 fists, cooling cylinder 3, fist pressure cylinder
4.5th flange 6...insulation material 7...
Tank 8...Tensile wire 9-13...Wheel 14, +
5-・Jacket Ifla, I? a ・Inlet 1 [i
b , 17b ・Outlet 1811Φ jacket for cooling medium) 19a ・Inlet for fluid +9b
・Fluid outlet 20・Drain pipe 21.21a,
21b ・Guide groove 22a
22b-・Annular groove 23・・Ice

Claims (1)

[Claims] A pressurizing cylinder having a downwardly tapered hole is connected to the lower part of the vertical cooling cylinder to which the concentrated mother liquor is supplied, and a drain pipe for recovering the concentrated liquid is connected to the upper part of the tapered hole at an appropriate position. An endless tensile wire rod for pulling ice crystals is routed through the cooling cylinder and the pressurizing cylinder, and one end is connected to the tapered hole through a guide groove communicating with the opening in the tapered hole of the drain pipe. A pressurized freeze-concentration device that is drilled into the inner surface of the