JPS614501A - Microwave-heating centrifugal evaporator - Google Patents

Abstract

PURPOSE:To heat efficiently and to prevent overheating by heating directly an evaporation surface constituted of dielectrics with microwaves. CONSTITUTION:A liquid to be treated is introduced from an inlet 11, and supplied onto an evaporation surface 6 through a supply tube 12. The evaporation surface is rotated by a driving shaft 15, and microwaves are irradiated from a microwave guide 10 to heat the surface. Vapor is taken out from a fraction outlet 13, and the remaining liquid is discharged from an outlet 14.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a rotating body having a complete evaporation surface for receiving the raw solution to be treated in a vacuum volume 7, and a liquid to be treated on the evaporation surface of the rotary body. This invention relates to a centrifugal evaporator that is designed to supply a raw solution and perform necessary treatments such as distillation, concentration, deaeration, dehydration, deoxidation, and deodorization.

2. Description of the Related Art In this type of conventional centrifugal evaporator, a heating medium method or a radiant heating method using a heater is used to heat the evaporation surface of a rotating body. In the heating medium method, the heating medium is usually introduced from outside the vacuum container along the rotational axis of the rotating body and heat is input to the evaporation surface, so it is necessary to form a circulation path for the heating medium along the rotational axis of the rotating body. However, not only does it have the disadvantage of having a complicated structure in terms of insulation, cooling, and sealing, but it is also toxic due to leakage of the heating medium. be.

On the other hand, in the radiation heating method using a heater, as shown in Figure 2 of the attached drawings, a heating heater is placed on the back side of the funnel-shaped evaporation surface 3 of a rotating body placed inside a vacuum container, and this heating heater is energized. By doing so, the evaporation surface 3 is completely heated.

With this method, it is easy to cause problems such as disconnection of the heater wire and adhesion of evaporated matter from the object to be treated. , there is also a risk of oats heating up.

Problems to be Solved by the Invention Therefore, in order to solve the above-mentioned drawbacks and problems of the conventional heating medium method and radiant heating method, the present invention uses microwaves to improve the evaporation surface of the rotating body and the raw solution to be treated. The purpose is a microwave-heated centrifugal evaporator that directly heats.

Means for Solving All Problems In order to achieve the above objects, the microwave heating type centrifugal evaporator according to the present invention uses a rotating body having an evaporating surface for receiving the undiluted liquid to be processed using a dielectric material such as glass or ceramic. The wall portion of the vacuum container facing the evaporation surface of the rotating body l/c
A dielectric window is provided, a microwave waveguide is connected to the window, and the microwave is applied to the dielectric rotating body and the stock solution to be treated.

The pressure inside the working vacuum vessel is set to /0' Pa level, it is rotated by rotating bodies ij/000 r, p, m, and microwaves are injected from the outside through a microwave waveguide and a window. Microwaves are absorbed only by the dielectric rotating body and the object to be processed. There is no part where the temperature of VC is higher than the alternating evaporation temperature, so there is no risk of oat cooling, and clean evaporation can be performed.

Embodiment Hereinafter, an embodiment of the present invention will be described with full reference to FIG. 1 of the accompanying drawings.

In Fig. 1, reference numeral 5 denotes a vacuum vessel, and a rotating body 7 having 6 funnel-shaped evaporation surfaces is disposed inside this vessel j, and this rotating body 7 is made of a dielectric material such as glass or ceramic. There is. Vacuum container! A window t made of an electrically shielding material is provided in a portion of the front wall of the front wall facing the funnel-shaped evaporation surface t, and a sealing mounting member is attached to the outside of this window r. A microwave waveguide IO connected to a suitable microwave source is installed. In FIG. 1, the upper wall of the vacuum container 5 has a processing liquid inlet 7. A processing liquid supply pipe 12 is provided from this inlet portion 71.
extends toward the top of the funnel-shaped evaporation surface 6. On the other hand, a vacuum container! The lower wall VC is provided with a distillate outlet 13 and a residual liquid outlet, as shown. Although not shown, the vacuum vessel jv'cVi is naturally connected to an exhaust system. The rotating body 7 is rotationally driven via a drive shaft /If. The level of microwave energy supplied from the microwave waveguide 10 through the window may be suitably controlled by any means to provide an optimum heating temperature depending on the type of concentrate to be treated.

The supplied microwaves enter the rotating body 7vc and directly heat the evaporation surface 6 of the rotating body 7vc, and are absorbed by the processing liquid to heat itself.

1 As explained above, the apparatus according to the present invention is configured so that microwaves are absorbed only by the dielectric rotating body and the processing liquid, so it can be heated efficiently and without the risk of overheating. Also, unlike conventional radiation heating methods, it does not require large amounts of power and does not use a heating medium, so there is no need for toxic substances to be mixed into the processed material, and clean processing is possible. .

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing essential parts of an embodiment of a microwave heating type centrifugal evaporator according to the present invention, and FIG. 2 is a schematic sectional view showing an example of a conventional centrifugal evaporator. In the figure, t: evaporation surface, 7: dielectric rotating body, I! ′: window, 1
0: Microwave waveguide.

Claims (1)

[Claims] A rotating body with an evaporation surface that receives the stock solution to be processed is placed in a vacuum container, and the stock solution to be processed is supplied to the evaporation surface of this rotating body to perform distillation, concentration, deaeration, dehydration, deoxidation, and deodorization. In a centrifugal evaporator designed to perform necessary processes such as, the rotating body is made of a dielectric material such as glass or ceramic, and a window of the dielectric material is provided in the wall portion of the vacuum container facing the evaporation surface of the rotating body, A microwave heating type centrifugal evaporator characterized in that a microwave waveguide is connected to the window and microwaves are applied to the dielectric rotating body and the stock solution to be treated.