JPH0952058A - Solvent separating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solvent separating apparatus which can reduce a time necessary for inspecting the content of asphalt and recover the solvent efficiently. SOLUTION: A solvent is separated centrifugally by rotating a drum 1 in which aggregate A and filter paper B containing a solvent after the extraction of asphalt are placed. Air is supplied from the second partition chamber to the first partition chamber 3 by a blower 6 to prevent solvent mist in the first partition chamber 3 from flowing into the second partition chamber. By using the air flow, the solvent mist in the first partition chamber 3 is discharged to be recovered by a mist recovery device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solvent separation device for separating a solvent from an aggregate or the like obtained after extracting asphalt from an asphalt mixture using the solvent.

[0002]

2. Description of the Related Art As for the surface layer and base layer of asphalt pavement, if the content of asphalt is insufficient, cracks and exfoliation are likely to occur. Then, the asphalt content is inspected by extracting the asphalt from the aggregate.

The Soxhlet method is known as one of the methods for inspecting the asphalt content. This Soxhlet method, a chlorine-based solvent such as carbon tetrachloride and ethane trichloride contained in a solvent container is heated by a gas burner or the like to evaporate, and the evaporated solvent is introduced into a cooler and condensed, Asphalt is extracted from the asphalt mixture by dropping it into the asphalt mixture filled in the cylindrical filter paper of the filter, and the aggregate after the asphalt extraction is placed in a drying oven together with the filter paper to completely remove the solvent. In this method, the total weight of the aggregate and the filter paper is measured, and the asphalt content is determined based on the difference between the total weight of the filter paper and the asphalt mixture before the asphalt extraction.

[0004]

When the content of asphalt is determined by the above-mentioned Soxhlet method, the aggregate and the filter paper after extraction of asphalt contain a large amount of solvent. When dried by drying, a large amount of solvent is wasted, and the solvent may drip into the drying furnace to damage the drying furnace. Therefore, prior to drying the aggregate and the filter paper, these are left for a long time (for example, 6
The solvent is dropped from the aggregate and the filter paper to some extent by allowing it to stand for a while and allowing the solvent to drop. Therefore, there is a problem that it takes a long time to inspect the asphalt content.

Further, even after the solvent is dropped, the aggregate and the filter paper still contain a large amount of the solvent, so that there is a problem that the solvent is still wasted. Further, when the solvent is dripped, the aggregate and the filter paper that have been heated in the solvent extraction step are cooled, and as a result, it takes a long time to dry the aggregate and the filter paper in combination with the fact that the content of the solvent is high, and the asphalt. There is a problem that it takes a longer time to inspect the content.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a solvent separator capable of promptly inspecting an asphalt content and efficiently recovering a solvent. To aim.

[0007]

SUMMARY OF THE INVENTION To achieve the above object, a solvent separation device of the present invention has a rotary shaft having a large number of through holes in its peripheral surface and accommodating aggregate and filter paper containing a solvent after asphalt extraction. A flexible drum, a rotation driving means for driving the drum to rotate, a compartment for surrounding the drum and partitioning the drum and the rotation driving means, and a communicating portion for communicating the compartment and the space on the rotation driving means side, A blowing means for preventing the solvent mist in the compartment from flowing into the space on the side of the rotation drive means through the communicating portion and for discharging the solvent mist from the compartment, and a solvent mist discharged from the compartment by the blowing means. And a mist collecting device for collecting the mist.

According to this solvent separation device, the aggregate containing the solvent after the asphalt extraction and the filter paper are housed in the drum,
By rotating the drum together with the rotation drive means, the solvent contained in the aggregate and the filter paper can be scattered into the compartment by the centrifugal force. At this time, the blowing means can prevent the solvent mist generated inside the compartment from flowing into the space on the side of the rotation driving means, and the solvent mist can be discharged from the compartment to be collected by the mist collector. Can be collected. As described above, the solvent separation device of the present invention can forcibly separate the solvent contained in the aggregate and the filter paper by the centrifugal force, so that the solvent is quickly and effectively removed from the aggregate and the filter paper. be able to.

In the solvent separating apparatus having the above-mentioned structure, it is preferable that the mist recovering device is constituted by a coil-shaped pipe. In this case, the solvent mist discharged from the compartment by the blowing means is formed into the coil-shaped pipe. Introduced into the pipe, the solvent mist can be attached to the inner wall of the pipe by centrifugal force and collected. Therefore, the solvent mist can be efficiently collected with a simple structure.

[0010]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a sectional view showing an embodiment of the solvent separation device of the present invention. This solvent separation device includes a rotatable drum 1 in which an aggregate A housed in a bottomed cylindrical filter paper B is placed, and the drum 1
A rotation drive means 2 for rotating and driving the drum 1, a first compartment 3 for surrounding the drum 1 and partitioning the drum 1 and the rotation drive means 2, and a second compartment 3 for surrounding the rotation drive means 2.
Partition chamber 4, a communication section 5 that communicates the first partition chamber 3 and the second partition chamber 4, a blowing unit 6 that blows air to the first partition chamber 3 through the communication unit 5, and a blowing unit. A mist collector 7 (see FIG. 2) that collects the solvent mist discharged from the first compartment 3 by 6 and a solvent tank 8 that stores the collected solvent constitute a main part.

The aggregate A is obtained by extracting asphalt from an asphalt mixture by the Soxhlet method and contains a large amount of solvent.
The drum 1 has a bottomed cylindrical shape with a large number of through holes 11 formed on its peripheral surface, and a rotary shaft 12 provided at the bottom thereof.
Are supported by the shaft support portion 14 via the slide bearing 13. The shaft support portion 14 is fixed to a bracket 41 attached to the upper portion of the second compartment 4.

The rotary drive means 2 comprises a motor 21 suspended from the bracket 41, and a coupling 22 for connecting a drive shaft 21a of the motor 21 to the rotary shaft 12 of the drum 1. . The motor 21 is
It is an explosion-proof type, and its rotation speed is set to about 1500 rpm.

The first compartment 3 is a box-shaped one made of a stainless steel plate, and a lid 31 is rotatably and openably attached to the top of the first compartment 3 via a packing 30. The bottom 32 of the first compartment 3 has a raised bottom so that a small space C can be formed between the bottom 32 and the upper surface of the second compartment 4 and is separated from the aggregate A and the filter paper B. The solvent is inclined at a predetermined angle so that the solvent flows down in one direction. A short tube portion 33 is provided at the center of the bottom portion 32. The short tube portion 33 is raised from the bottom portion 32 by a predetermined height so that the solvent flowing down the bottom portion 32 does not flow into the small space C. Has been. Then, the shaft support portion 14 is inserted into the short tube portion 33 with a predetermined gap 51. An exhaust port 34 for exhausting the solvent mist generated inside is formed in the upper part of the first compartment 3. In addition, in the lower part of the first compartment 3,
A drain pipe 35 for connecting the solvent flowing down the bottom 32 to the solvent tank 8 is connected.

The second compartment 4 is a box type of a substantially sealed structure formed of a stainless plate, and an opening 52 is formed on the upper surface thereof. This opening portion 52 is provided with the gap 51 between the shaft support portion 14 and the short tubular portion 32,
A communication portion 5 for communicating the first compartment 3 and the second compartment 4 is configured.

The blower means 6 is composed of a thin axial fan, and the blower side thereof faces the opening 42 formed on the side surface of the second compartment 4 in the second compartment. It is attached to the chamber 4. The mist collector 7 is composed of a coiled pipe, the intake side of which is connected to the exhaust port 34 of the first compartment 3 via an intake pipe 71, and the exhaust side of which is connected via an exhaust pipe 72. Is communicated with the solvent tank 8. The solvent tank 8 includes a glass window 81 for visually observing the liquid surface and a drain port 82 for discharging the contained solvent.

With the above construction, the aggregate A containing the solvent after the asphalt extraction is accommodated in the drum 1 together with the filter paper B, and the drum 1 is rotated by the rotation driving means 2 so that the aggregate A is obtained. The solvent contained in the filter paper B and the filter paper B can be separated from the aggregate A and the filter paper B by the centrifugal force and scattered into the first compartment 3.
At this time, it is possible to blow air from the second compartment 4 to the first compartment 3 through the communication part 5 by driving the air blowing means 6. Therefore, it is possible to prevent the solvent mist in the first compartment 3 from flowing into the second compartment 4, and it is possible to ensure safety. Further, the solvent mist in the first compartment 3 is passed through the exhaust port 34 to the first
Can be discharged from the compartment 3 and introduced into the mist collector 7. The solvent mist introduced into the mist collector 7 is attached to the inner wall of the pipe forming the mist collector 7 by centrifugal force. Then, it can be collected in the solvent tank 8.

As described above, according to the solvent separating apparatus,
Since the solvent contained in the aggregate A and the filter paper B can be forcibly separated by the centrifugal force, the solvent can be quickly and effectively removed from the aggregate A and the filter paper B.
More specifically, for example, when the aggregate A and the filter paper B containing 17% by weight of the solvent are left for 6 hours, the solvent can be reduced to only 13% by weight. In the case of using, the aggregate A and the filter paper B can be reduced to 7% by weight simply by accommodating them in the drum 1 and rotating them for about 10 minutes.

Therefore, the recovery rate of the solvent can be significantly increased, and the drying time in the post-process can be significantly reduced. Moreover, since the aggregate A is heated to about 110 ° C. during extraction of asphalt and retains the heat to some extent even after the solvent is centrifugally separated by the solvent separator, the solvent is centrifugally separated. Immediately after the separation, if the product is placed in a drying oven and dried, the temperature raising time of the aggregate A or the like can be greatly shortened. As a result, combined with the fact that the content of the solvent is small, the drying time can be reduced to about half that of the conventional case.

In addition, the solvent separating device controls the solvent mist of the first compartment 3 from flowing into the second compartment 4 by one blowing means 6 and at the same time controls the solvent mist to the first compartment. Since it is discharged from the compartment 3,
The structure can be simplified. Furthermore, since the mist collector 7 is composed of a coiled pipe, the solvent mist can be effectively collected with a simple structure.

[0020]

As described above, according to the solvent separation device of the present invention, the solvent contained in the aggregate and the filter paper can be forcibly separated by the centrifugal force, so that the solvent is removed from the aggregate and the filter paper. Can be quickly and effectively removed. Therefore, the time required to inspect the asphalt content can be significantly shortened, and the waste of the solvent can be reduced, so that the inspection can be economically performed.

In particular, when the mist collecting device is composed of a coil-shaped pipe, there is a unique effect that the solvent mist can be efficiently collected with a simple structure.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a solvent separation device of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 drum 2 rotation drive means 3 1st division chamber 4 2nd division chamber 5 communicating part 6 air blower means 7 mist collecting device A aggregate B filter paper

Claims (2)

[Claims] 1. A rotatable drum having a large number of through holes on its peripheral surface and accommodating an aggregate containing a solvent after extraction of asphalt and a filter paper, a rotary drive means for rotationally driving the drum, and a drum surrounding the drum. And a compartment for partitioning the drum and the rotation drive means, a communication portion for communicating the compartment and the space on the rotation drive means side, and the solvent mist of the compartment flows into the space on the rotation drive means side through the communication portion. And a mist collecting device for collecting the solvent mist discharged from the compartment by the air blowing means, and a mist collecting device for collecting the solvent mist discharged from the compartment. 2. The solvent separation device according to claim 1, wherein the mist recovery device is a coil-shaped pipe for introducing the solvent mist discharged to the outside of the compartment.