JPH0523802B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a distillation apparatus for partially evaporating a liquid, recovering its vapor, and separating it from a residual liquid. Used for separation.

[Conventional technology and its problems]

In recent years, a liquid tank type test device has been developed that uses fluorine-based inert liquids with different boiling points as test liquids (high-temperature liquid and low-temperature liquid) for thermal shock testing of printed circuit board units, automobile parts, etc. .

If a liquid bath type test device is used, the test liquid deteriorates as the test is repeated many times. mixed in, resulting in two-liquid mixing. If the two liquids are mixed, the accuracy of the test will decrease, and it will also have an indirect negative effect on the specimen and test equipment, so it is necessary to separate the two liquids using a distillation device.

Conventionally, the current situation is that a large-scale device for producing a test liquid is temporarily used as a distillation device for distilling the above-mentioned mixed liquid.

Therefore, it is labor-intensive to transport the test liquid, and the distillation equipment requires complicated controls and operations to adjust the distillation pressure and temperature, and there is a problem in that the distillation efficiency is not very high. . Therefore, the running cost of the liquid tank type testing device has become extremely high.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a distillation apparatus that can efficiently separate a mixture of two liquids having relatively similar boiling points and that requires a small installation area.

[Means to solve the problem]

In order to solve the above problems, the present invention includes an evaporator, a column provided above the evaporator, a condenser provided above the column, and a condenser provided below the condenser. The apparatus is characterized by comprising a saucer for receiving the liquid, and a U-shaped conduit connected to the saucer for draining the liquid.

[Effect]

By heating the liquid in the evaporator, mainly the liquid with a lower boiling point evaporates, rises in the column, and is condensed in the condenser.

The condensed liquid drips into the basin and flows from the basin through the U-shaped conduit.

Liquid accumulates in the U-shaped conduit, which creates steam pressure in the condenser. This allows more complete condensation, suppresses entrained evaporation of the liquid with a higher boiling point, and prevents vapor from passing through the U-shaped pipe.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front sectional view of the distiller 17.

The distiller 17 is formed by sheet metal processing a stainless steel plate, and includes a rectangular parallelepiped-shaped evaporator 31 with a heater 32 attached to the bottom, a cylindrical column 33 connected to the top of the evaporator 31, and a column 33. A cylindrical condenser 34 connected to the upper part and having a larger diameter than the column 33 and sealed with a lid 34b, and an annular tray 35 formed by the bottom of the condenser 34 and the upper end of the column 33 are integrated. It is structured as follows. Evaporator 31
The outer peripheral surface of the tower 33 is covered with a heat insulating material (not shown).

Temperature sensor TS1 is connected to evaporator 3 of distiller 17.
This is to detect the end point of distillation by detecting the temperature of the liquid in the chamber.

The mixed liquid distilled by the distiller 17 is stored in a storage tank 13.
The liquid that flows into the evaporator 31 from the evaporator 31 and is separated by distillation is stored in the storage tank 13 again.

The storage tank 13 is formed into a box shape by sheet metal processing of a stainless steel plate, and a float switch (not shown) is provided inside to detect the upper and lower limits of the liquid level, and the upper lid is connected to the outside air. There is a hole for it.

At the bottom of the storage tank 13, there is a solenoid switching valve SV.
7 and water separation filter 16 are connected via piping, and when the electromagnetic switching valve SV7 is opened,
The liquid in the storage tank 13 flows through the water separation filter 16 under its own weight and flows into the evaporator 31 of the distiller 17. In other words, the water separation filter 16 operates efficiently by the natural flow of liquid according to the height positional relationship between the storage tank 13 and the evaporator 31, and separates the water contained in the liquid to drain the water into the drainage channel. Drain water from 16a.

Next, taking as an example a case where a mixed liquid in which a small amount of a high temperature liquid HQ with a high boiling point is mixed into a low temperature liquid LQ with a low boiling point, which is a fluorine-based inert liquid, is distilled to recover the low temperature liquid LQ, the distiller 17 The structure and operation of is explained in detail.

The mixed liquid flowing from the water separation filter 16 through the port 41 is stored in the evaporator 31. When heating is started by the heater 32, the temperature of the mixed liquid gradually rises from around room temperature, and the low temperature liquid LQ with a low boiling point, which accounts for most of the mixed liquid, actively evaporates, and the temperature reaches around 120 to 130 degrees Celsius. The amount of evaporation is the highest.

The vapor evaporated in the evaporator 31 rises within the tower 33 and reaches the condensation chamber 34a. Evaporator 31 and condenser 3
4 are separated by a certain distance by the column 33, the vapor of the high temperature liquid HQ is suppressed from reaching the condensation chamber 34a, and the distillation efficiency is improved.

The condenser 34 has a coil-shaped cooling pipe 37 , and the cooling water flows through the cooling pipe 37 at the inlet 37 .
By flowing from a to the outlet 37b, the vapor in the condensing chamber 34a is condensed to obtain a low-temperature liquid LQ, which is dripped into the saucer 35.

The low temperature liquid LQ dropped into the saucer 35 flows into the U-shaped pipe 18 from the outflow hole 35a provided at the bottom of the saucer 35 due to its own weight. U-shaped pipe 1
8, the low temperature liquid LQ will remain,
Since the vapor pressure in the condensing chamber 34a is applied through the outflow hole 35a, the liquid level on the distiller 17 side of the U-shaped pipe 18 is lower than the liquid level on the storage tank 13 side, and the liquid level difference h
1 occurs. In other words, vapor pressure Ph is generated in the condensing chamber 34a due to the presence of the U-shaped pipe 18, and as a result, the low temperature liquid LQ is almost completely condensed, and entrained evaporation of the high temperature liquid HQ is suppressed. Distillation efficiency is improved.

Now, the temperature of the mixed liquid in the evaporator 31 increases with time, but as the low temperature liquid LQ evaporates, the concentration of the low temperature liquid LQ in the mixed liquid decreases, and as a result, the boiling point of the mixed liquid also increases. , the temperature of the mixed liquid does not easily exceed the boiling point of the high temperature liquid HQ.
When most of the low-temperature liquid LQ evaporates and the concentration of the high-temperature liquid HQ increases, the boiling point of the mixed liquid approaches the boiling point of the high-temperature liquid HQ, but the boiling point of the mixed liquid approaches the boiling point of the high-temperature liquid HQ. When the temperature reaches 1, the temperature sensor TS1 detects this, and the heating by the heater 32 is stopped to complete the distillation.

When the distillation is finished, only the purified low-temperature liquid LQ is stored in the storage tank 13, and the evaporator 3
High-concentration high-temperature liquid HQ remains in 1.

The low temperature liquid LQ in the storage tank 13 is returned to the low temperature bath by a suitable pump, and the high temperature liquid HQ remaining in the evaporator 31 is returned to the high temperature bath by the same suitable pump.

According to the embodiment described above, the evaporator 31, the column 33,
Since the condenser 34 and the condenser 34 are connected in the vertical direction and are integrally configured, the distiller 17 can be made small and the installation area (bottom area) can be small.

The position of the condenser 34 is changed by the column 33 to the evaporator 31.
Because it is separated from the HQ, entrained evaporation of the high temperature liquid HQ is suppressed.

In addition, low temperature liquid LQ accumulates in the U-shaped pipe 18,
Therefore, pressure due to steam is generated in the condenser 34. This allows more complete condensation, suppresses entrained evaporation of the high-temperature liquid HQ, improves distillation efficiency, and enables efficient distillation of even liquids with similar boiling points.

Distillation starts when the heater 32 is turned on and ends when the end point temperature is detected by the temperature sensor TS1, so control and operation are extremely simple.

Since the condenser 34 has a structure that allows cooling water to flow through the cooling pipe 37, it has a simple structure, is lightweight, has no noise, is quiet, and is easy to operate and maintain.

Therefore, by installing a purification device using the distiller 17 in the vicinity of the thermal shock test device, it is possible to distill or purify the test liquid on the spot easily, simply, and at low cost.

In the above embodiment, the port 41 and the outflow hole 3
The positions such as 5a may be other than those mentioned above. The condenser 34 and tower 33 may have a rectangular tube shape such as a square or hexagon, and the evaporator 31 may have a hexagonal or other rectangular tube shape or a cylindrical shape. Other coolant such as a refrigerant liquefied by a compressor may also flow through the cooling pipe 37 . It is possible to adopt various shapes, dimensions, structures, materials, etc. of the other parts other than those described above.

In the above embodiment, the distiller 17 is applied to distilling a test liquid of a thermal shock test device, but it can also be applied to distilling other mixed liquids or solutions.

〔Effect of the invention〕

According to the present invention, since the evaporator, tower, and condenser are vertically connected and configured as one,
The distiller can be made small, and the installation area can be reduced.

Since the condenser is located away from the evaporator by the tower, entrained evaporation of liquid with a high boiling point is suppressed, and since liquid accumulates in the U-shaped pipe, vapor pressure increases in the condenser. This results in more complete condensation, suppresses entrainment of evaporation of liquids with high boiling points, improves distillation efficiency, and enables efficient distillation of even liquids with similar boiling points.

Therefore, by installing a purification device using a distiller near a thermal shock test device or the like, it is possible to distill or purify a test liquid on the spot easily, simply, and at low cost.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of a distiller according to the present invention. 17... distiller, 18... U-shaped pipe, 31...
Evaporator, 33... Tower, 34... Condenser, 35...
Saucer, LQ...Low temperature liquid (liquid).

Claims (1)

[Claims] 1. An evaporator, a column provided above the evaporator, a condenser provided above the column, and a condenser provided below the condenser for receiving condensed liquid. A distillation apparatus comprising: a saucer; and a U-shaped pipe connected to the saucer for draining a liquid.