JPH0410901Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a laser photoreactor that introduces and irradiates a liquid or slurry raw material supplied into a container with laser light to cause a photochemical reaction.

[Conventional technology]

As a conventional laser light reactor, one shown in FIG. 3 has been proposed. (Special application 1986-25152). In FIG. 3, a is a reaction vessel, b is a window, c is a cylindrical mirror, d is a raw material liquid, f is a gas introduction tube, and l is a laser beam.

The reaction vessel a is filled with the raw material liquid d to a required level. The laser beam l is introduced into the reaction vessel a through a window b fitted with a transparent member such as glass. The incident laser beam l is repeatedly reflected by a cylindrical mirror c in the reaction vessel a and is irradiated onto the raw material. When the laser beam l is applied to the raw material liquid d,
Chemical substances in the liquid are excited and a photochemical reaction occurs. Further, when performing a gas-liquid reaction, gas is introduced from the gas introduction pipe f.

[Problem that the invention attempts to solve]

When such a laser light reactor is used to cause a photochemical reaction in a raw material with high turbidity and high absorption of laser light, the following problems arise.

(1) Since the absorption of laser light is large, the laser light l
is absorbed in the vicinity of window b, and the irradiation volume becomes extremely limited, requiring a long time to cause the entire area to react.

(2) Therefore, if the beam intensity of the laser beam 1 is increased in order to lengthen the distance through which the laser beam 1 passes, not only will the entrance window b be more likely to be damaged, but the raw material liquid d will be irradiated with extremely strong laser beam 1. Therefore, undesirable side reactions such as evaporation and ionization may occur. Even if no side reactions occur, irradiation with a laser beam stronger than necessary is a waste of energy.

(3) Since the reaction is limited to the vicinity of the entrance window b, stirring and circulation must be carefully performed in order to effect the reaction on the entire raw material, which requires a large amount of energy.

[Purpose of invention]

The present invention was devised in view of the above-mentioned problems, and the purpose is to provide a laser photoreactor that can effectively cause a photochemical reaction to a raw material liquid or slurry that is highly absorbent to laser light. shall be.

[Means for solving problems]

In order to achieve the above object, the laser reactor of the present invention has an inner cylinder that houses a liquid to be reacted and is made of a transparent material and whose outer surface is a half-mirror surface, and which is provided so as to surround the inner cylinder and whose inner surface is a half-mirror surface. An outer cylinder that serves as a reflective surface,
It is equipped with an end plate provided to close the ends of the inner and outer cylinders, and the laser beam incident between the inner and outer cylinders is repeatedly reflected between the inner and outer cylinders.
It is characterized in that it passes through the inner cylinder and irradiates the non-reactive liquid.

〔Example〕

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

FIG. 1 is a partial sectional view of the laser photoreactor of the present invention, and FIG. 2 is a view taken along the - arrow in FIG. 1st
In the figure and FIG. 2, 1 is a reaction vessel, 2 is an outer cylinder, 3 is an inner cylinder, 4 is an end plate, 5 is a reflection plate, 6 is a reacted liquid, 7 is an entrance window, and 8 is a reacted liquid inlet pipe , 9 is a reaction liquid outlet pipe, and 10 is a laser beam. The reaction vessel 1 is a cylindrical vessel placed with its axis in the transverse direction, and is formed from an outer cylinder 2, an inner cylinder 3, and end plates 4 on both sides.

The inner cylinder 3 is made of a transparent material, and its outer surface is a half mirror surface. The outer cylinder 2 is provided so as to surround the inner cylinder 3, and its inner surface is a reflective surface coated with total reflection. Note that a reflector may be inserted into the inner surface of the outer cylinder 2. End plate 4
is a pair of disks, which are provided so as to close both ends of the inner and outer cylinders 3 and 2, with a reactant liquid inlet pipe 8 arranged in the center of one and a reaction liquid outlet pipe 9 arranged in the center of the other. There is. Between the inner and outer cylinders 3 and 2 of the end plate 4
The inner surface of the part that closes off is a reflective surface with a total reflection coating. Note that a reflecting plate 5 formed of a donut-shaped disk may be provided. The laser beam 10 is transmitted between the inner and outer cylinders 3 and 2 in the reaction vessel 1.
An entrance window 7 is installed in the end plate 4 through which the light is incident.

Incidentally, the entrance window 7 is not limited to the above, and may be provided in a part of the outer cylinder 2 as shown by the dashed line in FIG.
The laser light may be continuous light or pulsed light.

Next, the operation of the present invention will be explained.

As shown in FIG. 1, the laser beam 10 enters between the inner cylinder 3 and the outer cylinder 2 through the entrance window 7 at an appropriate angle with respect to the axial direction of the reaction vessel 1. The laser beam 10 irradiated onto the outer surface of the inner tube 3 is partially reflected and partially transmitted depending on the degree of coating on the outer surface of the inner tube 3, and is irradiated onto the reaction liquid 6. The reflected laser beam 10 is reflected by the inner surface of the outer tube 2 or the reflecting plate 5, and is again irradiated onto the outer surface of the inner tube 3. While repeating reflection in the axial direction and circumferential direction of the reaction vessel 1, the reaction liquid 6 in the inner cylinder 2 is sequentially irradiated. By appropriately setting the incident direction of the laser beam 10, the number of reflections can be adjusted. In this way, the number of times of irradiation can be increased and the irradiation volume can be increased for a raw material that absorbs a large amount of light, so that the reaction can be carried out efficiently.

When performing a gas-liquid reaction in the reacted liquid 6, the reaction vessel 1 is placed vertically as shown in FIG.
A donut-shaped tube with a large number of holes in its upper surface is installed at the bottom of the reaction vessel 1. Gas is introduced there through the gas introduction pipe 11. Note that if the length of the reaction vessel 1 is sufficiently long, the reflector 5 on the inner surface of the end plate 4
It doesn't have to be there.

[Effect of idea]

As described above, the laser light reactor of the present invention has the following effects.

(1) The irradiation volume can be increased for raw material liquids that absorb a lot of light, and the reaction rate can be increased.

(2) A large irradiation volume can be efficiently irradiated with light without irradiating a raw material liquid with an intensity stronger than necessary, where the laser light intensity required for reaction is small compared to the beam intensity.

(3) When performing a gas-liquid reaction, a gas introduction pipe can be installed and used as a vertical type.

(4) Appropriate irradiation intensity and irradiation volume can be set by coating the outer surface of the inner cylinder and changing the incident angle.

(5) Since the structure is simple and a large power unit is not required for implementation, the operating cost can be lower than that of conventional methods.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of the laser photoreactor of the present invention, Fig. 2 is a view taken in the direction of the - arrow, Fig. 3 is a sectional view of a conventional laser photoreactor, and Fig. 4 shows another embodiment. FIG. 2 is a cross-sectional view of the laser photoreactor shown in FIG. 1... Reaction container, 2... Outer cylinder, 3... Inner cylinder, 4
... End plate, 6 ... Reacted liquid, 10 ...
laser light.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An inner cylinder that contains a reaction liquid and is made of a transparent material and whose outer surface is a half-mirror surface, and which is provided so as to surround the inner cylinder and whose inner surface is a reflective surface. It is equipped with an outer cylinder that extends outward, and an end plate that is installed to close the ends of the inner and outer cylinders.
What is claimed is: 1. A laser light reactor characterized in that a laser beam incident on the reactor is repeatedly reflected between the inner and outer cylinders, sequentially passes through the inner cylinder, and is irradiated onto a non-reacting liquid. (2) The laser light reactor according to claim 1 of the utility model, wherein the inner surface of the portion of the end plate that closes the gap between the inner and outer cylinders is a reflective surface.