JPS60129101A - Microwave heating centrifugal evaporator - Google Patents

Abstract

PURPOSE:To make the structure of a microwave heating centrifugal evaporator simple and to improve its efficiency by heating an evaporating surface directly by supplying incident microwave to a rotary body. CONSTITUTION:The liquid to be treated is fed to a funnellike evaporating surface 6 from a feeding pipe 9 of the liquid to be treated. A hollow rotary shaft 13 is driven by a motor 15 to form the film of the liquid on the evaporating surface 6. Microwave is fed from a microwave generator 17 to the inside of a hollow rotary body 7 and the evaporating surface 6 is heated from the rear side. The residual liquid is discharged from an outlet 11 of the residual liquid; the vapor is exhausted from an exhaust port and evaporated fraction is withdrawn from an outlet 10 of the fraction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a rotary body disposed in a full container and equipped with an evaporation surface for receiving an undiluted solution to be treated, and the undiluted solution to be treated is supplied to the evaporation surface of the rotary body. Distillation, concentration, degassing, dehydration,
This invention relates to a centrifugal evaporator that performs necessary processes such as deoxidation and deodorization.

In this type of centrifugal evaporator, due to the centrifugal force generated by the rotation of a rotating body equipped with an evaporation surface, the stock solution to be treated that is supplied onto the evaporation surface is spread extremely thinly and uniformly in a cylindrical shape, resulting in high evaporation. Efficiency can be obtained. ・An electric heating method or a medium heating method is usually used to heat the evaporation surface of a rotating body. A heating heater 4 is disposed in instant contact with the dorsal side of the cone-shaped evaporation surface 6 of the body 2.
The evaporation surface 6 is heated by energizing the evaporation surface 6. In the medium heating method, a heating medium is introduced from outside the container along the axis of rotation of the rotating body, and heat is applied to the evaporation surface. However, all of these known methods have poor heating efficiency, and the electric heater method has the drawback that failures are likely to occur due to breakage of heater wires, adhesion of evaporated matter from the object to be treated, and the like.

In addition, the medium heating method requires a heating medium circulation path to be formed around the rotating shaft of the rotating body, which has the disadvantage of complicating the structure in addition to considerations such as heat insulation, cooling, and sealing.

The purpose of this invention is to directly heat the evaporation surface of a rotating body using microwave heating.The purpose of this invention is to provide microwave heating with a simple structure and high efficiency, which eliminates the drawbacks of conventional electric heater methods and medium heating methods. An object of the present invention is to provide a centrifugal evaporator using microwave heating.In order to achieve this object, in the centrifugal evaporator using microwave heating according to the present invention, a microwave generator is provided outside the Makabe container. The device is configured to inject microwaves from the device into the rotating body to directly heat its evaporation surface.

Preferably, in the apparatus of the present invention, the interior of the rotating body provided with the evaporation surface is formed into a cavity, and this cavity can be communicated with a microwave generator provided outside the vacuum container. An example of a solid line will be explained based on FIG. 2.3.

FIG. 2 shows a practical example of the present invention, in which 5 is a vacuum vessel in which a hollow rotating body 7 with a cone-shaped evaporation surface 6 is arranged, and the upper wall of the vessel 5 is the center of the vacuum vessel. has a processing liquid inlet section 8.
A processing liquid supply pipe 9 extends from the inlet portion 8 toward the top of the funnel-shaped evaporation surface 6 . Also, the vacuum container 5
A distillate outlet 10 and a residual liquid outlet 11 are provided on the lower wall of the vacuum vessel 5.Although not shown in the drawing, the vacuum vessel 5 is naturally equipped with an exhaust port.

The hollow rotating body 7 is connected to a hollow rotating shaft 13 extending through the rear wall of the full container 5, which hollow rotating shaft 16 is driven by a motor 15 via a movement mechanism 14. The inside of the hollow rotating shaft 13 forms a waveguide, one end of which communicates with the inside of the side rotor 7, and the other end connected to a suitable microwave generator 17 via a connecting pipe 16. 0 In Fig. 2, numerals 18 and 19 are bearings for the hollow rotating shaft 13,
Of course, these bearings may be of sealed structure.

With this configuration, the desired microwaves generated by the microwave generator 17 pass through the connecting tube 16 and the hollow rotating shaft 13 and enter the hollow rotating body 7, and the evaporation surface 6 is Heats directly from the back. Evaporation surface 6
The temperature of can be easily and accurately adjusted over a wide range simply by controlling the output of the microwave generator 17 accordingly.Referring now to FIG. 3, a modified embodiment of the invention is shown, In this case, the funnel-shaped evaporation surface 21 of the rotating body 20 is heated by microwaves through the processing space within the vacuum container 5 . That is, in this modified embodiment, the microwave from the microwave generator 22 is transmitted to the rotating body 20 from the supply port 24 provided on the front wall of the vacuum container 5 via the waveguide 26.
The light is made to be incident toward the dowel-shaped evaporation surface 21 of.

In this case, although not shown in the drawing, the microwave supply port 2
4 is preferably constructed so as to be protected from evaporated matter.Also, in the illustrated embodiment, the microwave is constructed so as to be incident on the evaporation surface 21 from the front, but if necessary, it may be constructed in another direction. Alternatively, the light can be incident from multiple directions.

As explained above, according to the present invention, since the evaporation surface of the rotating body is directly heated, the heating efficiency is higher than that of the conventional method, and there is no need for an electric heater, so there is no possibility of wire breakage. There is no malfunction or deterioration of heating characteristics due to adhesion of evaporated matter, and the heating temperature can be easily and accurately controlled.

In addition, there is no need to use a complicated heat input mechanism like the medium heating method, and the microwave can be input simply by using a waveguide, so the structure can be extremely simplified.

[Brief explanation of the drawing]

Figure 1 is a schematic cross-sectional view of a conventional centrifugal evaporator;
The figure is a schematic sectional view showing one embodiment of the microwave heating type centrifugal evaporator according to the present invention, and FIG. 3 is a schematic sectional view showing a modified embodiment of the present invention. In the figure, 6.21: Evaporation surface;
7.2o: Rotating body・17.22: Microwave generator・13・16・26: Waveguide◎

Claims (1)

[Claims] 1. A rotating body disposed in a vacuum container and equipped with an evaporation surface for receiving the stock solution to be processed, and supplying the stock solution to be processed to the evaporation surface of the rotating body for distillation and concentration. , deaeration, dehydration, deacidification,
In a centrifugal evaporator that performs necessary processes such as deodorization, a microwave generator is installed outside the true container,
A microwave heating type centrifugal evaporator characterized in that the microwave from the microwave generator is incident on a rotating body to directly heat the evaporation surface of the rotating body. 2. The interior of the rotating body provided with an evaporation surface is configured as a nitrogen cavity, and the entire interior of this cavity is communicated with a microwave generator provided outside the vacuum container (the apparatus according to claim 1). ◎