JPH057301U - Vacuum distillation device with bumping prevention mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] Automatically prevent bumping in vacuum distillation equipment. [Composition] A distilling flask 2 is sandwiched between a projector 6 and a photoreceiver 7 of a transmission type photoelectric sensor, which are generated by detecting a change in the amount of light beam of the photoreceiver caused by bubble generation and liquid flow in the initial stage of bumping. A solenoid valve 9 having an outside air intake provided by branching the output current from the sensor from the vapor phase pipe of the distillation apparatus.
Then, the solenoid valve is opened and the outside air is introduced to reduce the degree of pressure reduction, and bumping is suppressed at the initial stage of occurrence.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention is used for concentration of extracts, reaction solutions, etc. in chemical operations, separation of desired components, etc. The present invention relates to a bumping prevention mechanism in a vacuum distillation apparatus.

[0002]

[Prior art]

  In vacuum distillation, generally, a distillation flask equipped with a condenser is rotated in a heating bath. A rotary evaporator that operates under vacuum with an aspirator while rotating Is used. In vacuum distillation, if bumping occurs in the distillation flask, concentration and separation will be correct. It does not work well and is dangerous, and it is necessary to stop the bumping immediately.   The conventional method of preventing bumping is to open the aspirator valve slightly to prevent leakage. To reduce the vacuum degree or start a bumping state and see bubbles forming Leak on the rubber hose attached to the line Or adjust the rotation speed of the flask to calm the bumping. It   However, these methods have low distillation efficiency, and the distillation status is not controlled. Needs to be seen and inefficient.

[0003]

[Problems to be solved by the device]

  The inventor visually confirms the occurrence of bubbles at the start of bumping and manually performs the bumping prevention operation. Instead, it would be very convenient to automate this, so I would like to know how to automate it. Using a transmission type optical sensor or a capacitance type proximity sensor as the bumping detection means. Bubbles in the boiling state in the distillate from the outside without being affected by the glass wall of the distillation flask. The inventors have found that the occurrence of liquid flow can be detected, and completed the present invention.

[0004]

[Means for Solving the Problems]

  According to the present invention, a glass distillation flask is sandwiched between the distillation liquid surface of the flask. The transmitter and receiver of the transmission type photoelectric sensor are placed in the upper position, and the light reception output of the sensor is set. Electromagnetic with terminals and outside air intake branching from the decompression gas phase piping of the distillation apparatus Vacuum distillation device with bumping prevention mechanism characterized by connecting to the valve input terminal, and Attach a capacitance type proximity sensor at a position on the liquid surface of the distillate close to the distillation flask. External air provided by branching from the output terminal of the sensor and the decompression gas phase piping of the distillation apparatus A bumping boiling prevention mechanism characterized by being connected to an input terminal of a solenoid valve having an intake port A vacuum distillation apparatus is provided.   That is, the light beam of the transmission photoelectric sensor is generated by the flow of bubbles and liquid generated during bumping. Are scattered and blocked, and the capacitance of the proximity sensor changes, The output from is transmitted to the solenoid valve, the solenoid valve is opened, and the outside air leaks into the vacuum system. Of.

[0005]   Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of the device of the present invention. FIG. 3 is a schematic explanatory view showing the schematic structure of the glass distillation flask immersed in the heating bath 1. A condenser 3 having a coiled cooling pipe is connected to the condenser 2, and the distillate receiver is connected to the condenser. 4 is attached. The distillation flask is a flask rotation mechanism (the rotation mechanism is shown in the drawing. Is omitted) and is rotated in a heating bath and heated uniformly. Cooler 3 Connect the aspirator 5 to the decompression port at the bottom of the Hold on.   The projector 6 of the transmission type photoelectric sensor is placed at a position on the liquid surface of the distillate with the distillation flask 2 in between. And a light receiver 7 is attached in opposition thereto, and these are a photoelectric switch circuit and a power supply. It is connected to the sensor main body 8 which stores a battery and the like.   Branch from the connection pipe of the decompression port of the cooler 3 and the aspirator 5 to open air and distill. The solenoid valve 9 connected to the depressurized atmosphere is attached to the output terminal of the sensor body 8 and the solenoid valve. The input terminal of is connected by an electric wire.

[0006]   Next, in the second embodiment, as shown in FIG. 2, the light of the first embodiment is used as the bumping detection means. Instead of the sensor, the capacitance type is located near the outside of the flask 2 and above the liquid surface of the distillate. The difference is that the proximity sensor 10 is attached, and the output terminal of this proximity sensor and the solenoid valve 9 input terminals are connected.

[0007]

[Action]

  The operation mechanism of the device of the present invention will be described. The liquid to be distilled is placed in a flask by a conventional method. Turn on and start the distillation operation. The bumping state begins, bubbles are generated in the liquid, and the liquid flows When it begins to become violent, in the first embodiment the light beam from the projector of the photoelectric sensor is The flow of the liquid and the air bubbles scatter and block the light to the light receiver. Accept this Current flows from the photoelectric switch circuit of the sensor to the solenoid valve, which opens Suction, and the degree of vacuum in the distillation system decreases. When the vacuum level drops, bumping stops and normal After returning to the vacuum distillation state, light is projected on the light receiver, and the solenoid valve is closed. In the second embodiment When the bumping state starts, the capacitance of the proximity sensor changes, which causes the output terminal The solenoid valve opens due to the current from, and when the bumping stops, the capacitance returns to the normal state and the solenoid valve closes. It   Since each of the above operations is performed in a very short time, the degree of vacuum of the distillation apparatus is It does not decrease so much, and there is no fear of impairing the distillation efficiency.   In each of the above-mentioned embodiments, an optical sensor or a proximity sensor is used as the detection means in the initial stage of bumping. Sensor was used, but ultrasonic displacement sensor and laser displacement sensor also detect early bumping. It is also possible to prevent bumping by combining these with a solenoid valve. And are possible.

[0008]

[Effect of device]

  In the vacuum distillation apparatus with a bumping prevention mechanism according to the present invention, a bumping state begins to start. At that time, the degree of decompression is automatically adjusted each time, and bumping stops, so it is necessary to monitor people. In addition, the degree of vacuum is slightly reduced, and vacuum distillation can be efficiently performed.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing a schematic structure of a first embodiment of a distillation apparatus of the present invention.

FIG. 2 is a schematic explanatory view showing a schematic structure of a second embodiment of the distillation apparatus of the present invention.

[Explanation of symbols]

1 heating bath 2 distillation flask 3 cooler 4 receiver 5 Aspirator 6 Floodlight 7 Light receiver 8 Optical sensor body 9 Solenoid valve 10 Proximity sensor

Claims (2)

[Scope of utility model registration request] 1. A glass-made distillation flask is sandwiched between a transmitter and a receiver of a transmission type photoelectric sensor at a position on the liquid surface of a distillation liquid, and a light receiving output terminal of the sensor and a decompression device of the distillation apparatus. A vacuum distillation apparatus with a bumping prevention mechanism, characterized in that it is connected to an input terminal of a solenoid valve having an outside air intake provided branching from a gas phase pipe. 2. A capacitance type proximity sensor is attached to a position on the liquid surface of the distillate in proximity to the glass distillation flask, and the output terminal of the sensor and the depressurized vapor phase pipe of the distillation apparatus are provided so as to branch. A vacuum distillation apparatus with a bumping boiling prevention mechanism, characterized in that it is connected to an input terminal of a solenoid valve having an outside air intake.