JPS632088Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a closed extractive overdryer, and more particularly to an overdryer that evaporates a solvent at a relatively low temperature under reduced pressure to dry a percake.

Conventionally, filtration is carried out using a pressurized filtration machine. The obtained supercake is dried by circulating hot air inside the filter while it is closed, and a type of superdryer is known in which the dried cake powder is taken out of the filter using gas. (Akira Jigan)
54-124683, etc.).

However, this type of over-dryer requires a large amount of gas to dry and remove the over-cake, and therefore has disadvantages such as an increase in the size of the device itself.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an overdryer that does not require a large amount of gas for drying and removing overcake.

According to the present invention, in a closed extraction over-dryer comprising a cylindrical closed tank and a pressure reduction mechanism for reducing the pressure inside the tank, the cylindrical closed tank is detachably attached to an upper body and an upper body. The upper body is provided with at least a supply port for the material to be extracted or the liquid to be analysed, and a stirrer, and a heating jacket is provided on the outer periphery of the upper body. The cylindrical sealed tank is equipped with a overfill made of wire mesh and/or cloth, and a heating steam coil disposed below the overfill, and the space inside the cylindrical sealed tank is substantially partitioned by the overfill. A closed extraction over-dryer is provided.

The present invention will be explained below based on specific examples shown in the accompanying drawings.

The closed-type extraction over-dryer of the present invention roughly consists of a cylindrical closed tank A and pressure reducing mechanisms B and C for reducing the pressure inside the tank.

The cylindrical sealed tank A consists of an upper body 1 and a lower body 2.

The upper body 1 is provided with a stirrer 3, and the material to be extracted is supplied into the tank A through a pipe 4 and a valve 5, and the solvent is further supplied through a pipe 6 and a valve 7 into the tank A. In this case, if the material to be extracted is already dissolved in a suitable solvent, there is no need to further supply the solvent.

A heating jacket 8 is provided on the outer periphery of the upper body 1, and a heating jacket 8 is provided on the outer periphery of the upper body 1.
heating is performed. That is, heated steam is supplied into the jacket 8 through the valve 9, and this steam is removed as drain by the drain trap 10.

In the present invention, the lower body 2 is detachably attached to the upper body 1. The structure of this lower body 2 is
As shown in the figure.

That is, the lower body 2 is supported on the upper body 1 by an arm 100 so as to be freely rotatable.

A flange 101 is formed on the upper edge of the lower body 2, a projection 102 is provided on the flange 101, and an O-ring 103 is further attached. Further, a flange 101' and a protrusion 102' are formed on the lower edge of the upper body 1 in correspondence with the flange 101 and the protrusion 102, and the upper body 1 and the lower body 2 are fixed in position with these facing each other. Ru. This position fixing is performed by the flanges 101 and 10.
1', a groove 104 for the projections 102, 102'.
This is done by fitting a ring 105 formed with a ring (see FIG. 3, which shows the structure of the ring).
That is, the flanges 101, 101' and the protrusion 1
By fitting the ring 105 with the 02 and 102' facing each other and rotating it, the upper body 1
and the lower body 2 are fixed in position in the state shown in FIG.

The lower body 2 is provided with an overfill 110, and the space inside the sealed tank A is filled with the overfill 110.
partitioned by.

As the overfill material 110, wire mesh or cloth of an appropriate mesh size can be used alone or in combination. The filter material 110 is supported by a perforated plate 111, and a heating steam coil 112 is provided in contact with the perforated plate 111 by means such as welding, and this coil 112 is further supported by a support 113. ing.

Heated steam is supplied to the heating steam coil 112 via a valve 115 to dry the overcake on the overfill material 110.

Returning to FIG. 1 again, the above-mentioned closed tank A is provided with pressure reducing mechanisms B and C in order to easily filter and dry the material to be extracted.

The first pressure reducing mechanism B is composed of a vacuum pump 200 connected to the lower body 2, and includes an overmaterial 1.
This is to reduce the pressure in the space below 10, and to allow the process to proceed smoothly.

That is, during overflow, the space below the overfill material 110 is brought into a reduced pressure state by the operation of the vacuum pump 200, and overflow liquid is stored in the liquid tank 202 via the valve 201. This uncondensed gas is transferred to a pipe 203 and a valve 204 as necessary.
And it is circulated and supplied to the space above the overfill material 110 in the closed tank A via the pipe 205 and the valve 206.

Further, the second pressure reducing mechanism C includes a vacuum pump 300 connected to the upper body 1, and
This is to reduce the pressure in the space above the filter material 110 and facilitate the removal of the solvent during drying of the filter cake.

That is, the vacuum pump 300 is connected to the upper body 2 via a valve 301 and a pipe 302, and operates when heating and drying the overcake accumulated on the overfill material 110, so that the space above the overfill material 110 is depressurized. This results in evaporative removal of the solvent at relatively low temperatures.

The recovered solvent vapor is cooled and condensed by a cooler 303 and recovered into a tank 304 .

In this case, the recovered solvent is reheated by a heater 305 and passed through a valve 306 to the overmaterial 110.
It can also be used to heat the overcake by circulating it into the space below.

Further, it is also possible to supply a small amount of inert gas or the like into this line through the valve 307 and use it as a carrier gas to more effectively remove the solvent.

Further, it is of course possible to construct the above-mentioned pressure reducing mechanisms B and C using only one vacuum pump, and in this case, the line may be modified so as to perform the above-mentioned function.

The procedure for overdrying using the closed extraction overdryer of the present invention described above is as follows.

That is, in the state shown in FIG. 1, the material to be extracted is supplied via the valve 5, and the solvent is further supplied via the valve 7 to the space above the filter material 110 in the tank A.

In this state, each valve is closed to seal the inside of the tank A, the stirrer 3 is activated, the extraction speed is accelerated, and after a sufficient extraction operation has been performed, the vacuum pump 200 is activated, and the overfill material 110 is Vacuum the liquid from below.

The over-suctioned liquid is stored in a liquid tank 202 via a valve 201. In this case, the uncondensed gas is circulated and supplied to the upper space of the filter material 110 if necessary.

The filtered cake accumulates on the overfill 110. The thickness of the cake is usually about 50 cm or less.

After the overfilling is completed, the valves 201, 204, and 206 are closed, the vacuum pump 300 is operated, and the space above the overfill material 110 in tank A is heated while reducing the pressure to evaporate and remove the solvent attached to the overcake. .

Heating is performed via a heating jacket 8 provided around the outer periphery of the upper body 1 and a heating steam coil 112 provided below the overlay 110.

In the over-dryer of the present invention, the over-cake is heated not only by the jacket but also by the heating steam coil 1.
An important feature is that it is also carried out by 12. That is, the heat from the coil 112 is directly transferred to the overfill material 11.
Since the heat is transferred to zero, the overcake on the overfill material 110 is directly and effectively heated.

In generally known heating dryers, the overcake is heated only from outside the dryer using a jacket. Therefore, the heating area is limited to the smooth surface of the jacket, and the heat transfer area is extremely small compared to the internal capacity of the dryer, and heating occurs when the substance to be dried that is being stirred comes into contact with the smooth heating surface of the jacket. However, this method has the problem that the heating heat transfer area cannot be increased.

However, according to the present invention, not only the jacket 8 but also the jacket 110 are heated directly by the steam coil 112. Moreover, since the surface of the overfill material 110 is generally not smooth and has a mesh shape, its heat transfer area is extremely large, so the overcake is heated extremely effectively and the solvent is effectively removed by evaporation. It is carried out in

In the over-dryer of the present invention, the above-mentioned heating is preferably performed while the over-cake is forcibly stirred and pulverized by the stirrer 3, which improves heat transfer compared to conventional dryers. The coefficient can be approximately doubled.

The solvent vapor evaporated from the percake is transferred to a valve 301 and a pipe 3 by a vacuum pump 300.
02, is further cooled and condensed by a cooler 303, and is collected into a tank 304.

The recovered solvent is reheated by a heater 305 if necessary, and then passed through a valve 306 to the overfill material 110.
is supplied to the space below and used for heating the overcake. This allows the overcake to be heated more effectively.

Further, as already mentioned above, the removal of the solvent vapor is facilitated by supplying or replenishing a small amount of inert gas or the like through the valve 307 and flowing it into the tank A as a carrier gas.

It will be understood that the above extraction, filtering and drying steps are performed in a completely closed environment, and the solvent evaporated from the filter cake is collected in the recovery tank 304, so that no pollution problems such as environmental pollution occur. .

After the drying process is completed, the ring 105 is rotated as shown in FIG.
Slide it to make it free.

In this state, the dried overcake is removed. Alternatively, the flange of the lower body 2 can be fixed with bolts or hydraulically, and after drying, loosen it and fix the lower body 2.
The dried cake can be taken out by moving it downward.

According to the extraction over-drying machine of the present invention, each step of extraction, over-drying, and drying can be performed in a completely sealed environment without discharging the solvent out of the system, and the over-extraction can be performed without using a large amount of gas. The cake is effectively dried.

The invention will be explained with the following example.

Example Using the dryer (approximately 30 capacity) shown in Figure 1,
The following samples were extracted and overdried.

Sample: Comfrey powder 1.9Kg Acetone 16Kg That is, after putting this sample into a closed tank A,
The mixture was thoroughly stirred using stirrer 3.

When the acetone turns blue and the chlorophyll in the comfrey powder is sufficiently dissolved in the acetone, open the valves 201, 204, and 206, and turn on the vacuum pump 20.
0 was activated to perform vacuum overflow. At this time, the pressure in the space below the overfill material 110 was approximately 260 mm/Hg.

Next, the valves 301 and 306 are opened, the other valves are closed, the vacuum pump 300 is activated, and while reducing the pressure inside the tank A, the jacket 8 and the steam coil 112 are used to heat the tank A and dry the overcake for about 1 hour. I did it.

After drying, the lower body 2 was opened and the residual cake was taken out.

As a result, the amount of recovered acetone was 15.98Kg,
The amount of acetone in the comfrey extraction residue was about 0.1%.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the overall structure of the over-dryer of the present invention, FIG. 2 is a diagram showing the structure of the lower body of the over-dryer of FIG. 1, and FIG. It is a figure showing the structure of the ring used in a dryer. DESCRIPTION OF SYMBOLS 1...Upper body, 2...Lower body, 110...Surface material, 112...Heating steam coil, 200...Vacuum pump, 300...Vacuum pump.

Claims (1)

[Claims for Utility Model Registration] (1) In a closed extraction over-dryer comprising a cylindrical closed tank and a pressure reduction mechanism for reducing the pressure inside the tank, the cylindrical closed tank has an upper body and an upper body. It consists of a lower body that is detachably attached to the upper body, and the upper body is equipped with at least a supply port for a material to be extracted or a material to be extracted and a stirrer, and a heating jacket is provided on the outer periphery of the upper body. and the lower body includes an overfill made of wire mesh and/or cloth, and a heating steam coil disposed below the overfill, and the inner space of the cylindrical sealed tank is formed by the overfill. A closed extraction over-dryer characterized by being substantially partitioned. (2) The pressure reduction mechanism is a first mechanism for reducing the pressure in the space below the overfill in the cylindrical sealed tank.
The over-dryer according to claim 1, comprising: a pressure reducing mechanism; and a second pressure reducing mechanism for bringing the upper space into a reduced pressure state.