JPS6031761Y2 - Mother liquor replacement cleaning equipment for solid particle suspensions or polymer solute solutions - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION To perform displacement washing of the mother liquor of a solid particle suspension or a polymeric solute solution, the raw material is generally first concentrated by a sedimentation or filtration device and then diluted with a washing liquid.

This operation is repeated until the required mother liquor replacement rate is reached.

However, since all of these processes are performed in batches, operational complexity and time loss are unavoidable.

This invention was made to solve such problems, and is a mother liquor replacement cleaning device for solid particle suspensions or polymer solute solutions that can eliminate the above-mentioned complexity and time loss. It is to obtain.

To explain this idea with reference to the drawings, in Figure 1,
A pressure-resistant container 17 having an inlet 20 and an outlet 23; a plurality of ring-shaped fixed filter leaves 25 provided at intervals inside the container 17; each interior of the fixed filter leaves 25; a filtration chamber formed in the filtration chamber; an opening 26 that communicates with the filtration chamber and opens to the outside of the container 17; a shaft 22 that is provided liquid-tightly and rotatably between the inside and outside of the container 17;
; a motor 31 provided outside the container 17 and rotating the shaft 22; a large number of stirring motors provided inside the container 17 facing each of the fixed filter leaves 25 and fixed to the shaft 22; Plate 30; communicates with the fixed filter leaf 25 formed by accommodating the stirring plate 30 and the container 17, or with the small chamber 27 formed by the fixed filter leaf 25 and the container 17, in the axial direction of the shaft 22; This is a mother liquor replacement cleaning device for a solid particle suspension or a polymeric solute solution, which is characterized by comprising a plurality of cleaning liquid supply ports 29 provided in the container 17.

In the figure, 18 and 19 are covers forming the container 17, and 21
24 indicates a gasket and a valve.

Both sides of the fixed filter leaf 25 are covered with a filter material or membrane.

28 indicates a small room. Although the cleaning liquid supply port 29 is formed in a part of the small chamber 27, it may be formed in the entire small chamber 28 as well.

32 and 33 are pulleys, and 34 is a belt.

The suspension or solution is supplied under pressure through the inlet 20 and enters the first chamber 27, and then passes through the gap 35 between the fixed filter leaf 25 and the shaft 22 to successively downstream chambers 27.

During this time, in these small chambers 27, the suspension supplied with the cleaning liquid from the supply port 29 is mixed with the supplied suspension or solution, and by the stirring action of the stirring plate 30, the mother liquor and the cleaning liquid are completely mixed and then transferred to the fixed filter. It is filtered through the filter medium or membrane of leaf 25 and discharged out of the device through opening 26.

The solid particles or polymeric solutes bound to the filter medium or membrane surface along with the filter medium are separated from the filter medium or membrane surface due to the strong stirring action of the stirring plate 30, and are uniformly mixed into the liquid in the small chamber 27 again.

The suspension or solution of solid particles or polymeric solutes that has been gradually replaced and washed with the mother liquor in the small chamber 27 in this manner moves to the small chamber 28 .

Since no liquid is supplied to the small chamber 28, the solid particle concentration or solute concentration increases as the filtered liquid is discharged from the opening 26, and gradually moves to the last small chamber.

During this period, even if the concentration has sufficiently progressed, the suspension or solution will not lose its fluidity due to the strong stirring action of the stirring liquid 30, and will be discharged from the last small chamber 28 through the outlet 23 and the valve 24 to the outside of the apparatus. .

The valve 24 uses the method disclosed in Japanese Patent Publication No. 45-15954, that is, when the concentration of a suspension or solution increases, its viscosity also increases, and therefore the rotating shaft torque increases. It is preferable to detect the shaft torque and control the cake discharge amount to increase or decrease when it is greater or less than a set value.

The rotating shaft torque is measured, for example, by measuring the electric motor input.

As mentioned above, in this device, the three small chambers numbered 27 function as a mother liquor replacement washing section, and the three small chambers numbered 28 function as a concentration and deliquification section for the suspension or solution that has been washed. The distribution of the cleaning section and the dehydrating section can be freely selected according to given conditions.

It is also conceivable to use a hollow rotating shaft and circular rotary filter leaves instead of the shaft 22 and stirring liquid 30, and to discharge the filtrate from the filter leaves to the outside of the apparatus through the hollow shaft.

In that case, the fixed filter leaf 25 could also be replaced by a non-filter plate.

However, all of these are possible only in the case of full-flow cleaning, and are not suitable for counter-current cleaning.

FIG. 2 is a system diagram when performing cross-flow continuous mother liquor replacement cleaning using the apparatus of the embodiment shown in FIG.

In the figure, 36 indicates the apparatus of FIG. 1, 20 indicates the suspension or solution inlet, 29 indicates the cleaning solution supply port, 26 indicates the filtration discharge opening, 23 indicates the outlet, 37 indicates the motor, and 38 3 represents a torque detection instrument, and 39 represents a regulator for controlling the discharge amount of the valve 24.

Further, 40 indicates a suspension or solution pump, 41 indicates a discharge pressure control valve of the pump, 42 indicates a suspension or solution flow meter, 43 indicates a cleaning solution pump, and 44 indicates a discharge pressure control valve of the pump. , 45 is a cleaning liquid flow control valve;
Reference numeral 6 indicates a cleaning liquid flowmeter, 47 a flow rate regulator, 48 a manual valve, and 49 a flow rate indicator.

The suspension or solution is pressurized by a pump 40 and supplied to the mother liquor replacement cleaning device 36 via a flow meter 42 .

The signal from the flow meter 42 is sent to a flow regulator 47.

The cleaning liquid is supplied to the cleaning device 36 via a flow control valve 45 pressurized by a pump 43 and a flow meter 46 .

The signal from the flow meter 46 is sent to a flow regulator 47, which controls the flow control valve 45 so that the ratio with the signal from the flow meter 42 becomes a preset ratio.

The distribution of liquid to each supply port 29 is adjusted by a manual valve 48 and a flow rate indicator 49 so as to be uniform.

The internal operation of the cleaning device 36 is as described above, and the cleaning waste liquid is discharged out of the system from the opening 26 as a filtrate, and the suspension or solution after cleaning is discharged as a concentrated liquid through the outlet 23,
It is discharged from the system through the valve 24.

The signal from the torque detection meter is sent to the regulator 39, which controls the valve 24 in response to the difference from a preset torque value.

FIG. 3 is a system diagram when performing countercurrent continuous mother liquor replacement cleaning using the apparatus of the embodiment shown in FIG.

In the figure, the numbers 20, 23, 24, 36, 37.38,
39, 40, 41, 42, 43, 44.45, 46.4
7 indicates exactly the same thing as in the case of Fig. 2, and the reference numeral 26-1
．． 26-2.26-3.26-4.26-5 indicate the first to fifth filtrate discharge openings counting from the suspension or solution supply side, and the reference numeral 29-1.29
-2.29-3 respectively indicate the first to eighth cleaning supply ports counted from the suspension or solution supply side.

Further, reference numeral 50.51 indicates a type of filtrate pump whose suction capacity can be automatically adjusted.

The suspension supply system operates exactly as in FIG.

The cleaning liquid supply system operates in the same manner as in FIG. 2, except that there is only one supply point, the supply port 29-3, and the manual valve 48 and flow rate indicator 49 are not provided.

The filtrate discharge opening 26-3 of the fixed filter leaf on the downstream side of the small chamber where the supply port 29-3 to which the cleaning liquid is supplied, that is, the valve 24 side, and the filtrate discharge opening 26-4 of the concentration and deliquification section .2
The filtrate discharged from 6-5, i.e., the final stage as seen from the suspension supply side, and the waste fluid discharged from the first stage as seen from the new cleaning liquid supply side, are collected together and sent to the supply port from the pump 50. 29-
2 to the small chamber on the upstream side, that is, on the suspension supply side.

Next, the liquid discharged from the opening 26-2 provided in the fixed filter leaf on the downstream side of the small chamber, that is, the mixture of the drained liquid that has finished the first and second stage cleaning when viewed from the new cleaning liquid supply side, is pumped. 51, the liquid is supplied through the supply port 29-1 to a small chamber on the upstream side, that is, a small chamber at the suspension or solution supply end.

Opening 26-1 provided in the fixed filter leaf in contact with the small chamber
The filtrate discharged from the
The mixture of waste liquids that have been cleaned from the stages and the final stage is discharged to the outside of the system.

On the other hand, the concentrated liquid of solid particles or polymeric solute that has completed the contact is discharged out of the system through the outlet 23 and the valve 24.

The control system for valve 24 operates exactly as in FIG.

By having this device configured as described above, it is possible to perform mother liquor replacement washing of a solid particle suspension or a polymeric solute solution continuously rather than batchwise.

Further, the cleaning liquid supply ports 29 communicate with each of the plurality of small chambers 27 in which the stirring plates 30 are housed, and are provided in the container 17 along the axial direction of the shaft 22.
The cleaning can be made faster and more efficient.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention. Fig. 1 is a diagram showing an outline of a mother liquor replacement cleaning device for solid particle suspension or polymer solution, and Fig. 2 is a diagram showing an outline of a mother liquor replacement cleaning device for solid particle suspension or polymer solution. FIG. 3 is a block diagram when performing mother liquor replacement cleaning. FIG. 3 is a block diagram when performing countercurrent continuous mother liquor replacement cleaning using the same apparatus. 17... Container, 20... Entrance, 22.
...Axis, 23...Exit, 25...
・Fixed filter leaf, 26...Opening, 27...
・Small chamber, 39...Cleaning liquid supply port, 30...
... Stirring plate, 31...Motor.

Claims (1)

[Scope of utility model registration request] A pressure-resistant container 17 having an inlet 20 and an outlet 23; a plurality of ring-shaped fixed filter leaves 25 provided at intervals inside the container 17; each interior of the fixed filter leaves 25; a filtration chamber formed in the filtration chamber; an opening 26 that communicates with the filtration chamber and opens to the outside of the container 17; a shaft 22 that is provided liquid-tightly and rotatably between the inside and outside of the container 17;
a motor 31 provided outside the container 17 and rotating the shaft 22; a large number of stirring plates provided inside the container 17 facing each of the fixed filter leaves 25 and fixed to the shaft 22; 30; The fixed filter leaf 25 and the container 17, which are formed by accommodating the stirring plate 30, communicate with each other, or the small chamber 27 formed by the fixed filter leaf 25 and the container 17, and the shaft 22
A mother liquor replacement cleaning device for a solid particle suspension or a polymeric solute solution, characterized in that the cleaning liquid is discharged from a plurality of cleaning liquid supply ports 29 provided in the container 17 along the axial direction of the solid particle suspension or polymer solute solution.