JPS6061038A - Reaction process - Google Patents

Abstract

PURPOSE:To separate catalyst magnetically with high efficiency after reaction by using small body of magnetic catalyst in a reaction system. CONSTITUTION:Reaction liquid is introduced into an intermediary tank 3 from a storage tank 1 of the reaction liquid, and small bodies of magnetic catalyst are added to the tank 3 to perform stirring. Then, the reaction liquid is introduced into a reaction tower 6. For an oxidation reaction, air is added by a blower 7, and the reaction liquid is introduced into a separation tank 10 after the reaction. A magnetic filter 9 comprising filter medium 9A and an exciting coil 9B for magnetizing the filter medium 9a is provided in the separation tank 10, and small catalyst body 4 is separated effectively and completely by the filter 9 in the tank 10. Produced reaction liquid is discharged through a discharge line 11. Furhter, when specified amt. of small catalyst body 4 is collected by th filter 9, the introduction of the produced liquid into the tank 10 is intermitted for a while, and back washing water is introduced from a waste water line 11 into the tank 10. Small catalyst 4 body collected by the filter 9 is back-washed and returned to the tank 3 through a returning line 12 and reutilized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reaction method. As is well known, reactions using catalysts include a fixed bed method in which a liquid or gaseous reaction system is passed through the catalyst to cause a reaction, and a fluidized bed method in which a catalyst is dispersed in the reaction system to cause a reaction. Compared to the former, the catalyst contact efficiency is higher, and it is also possible to regenerate the catalyst.
It is also desirable that the update does not require stopping operations.

However, there is a problem in that it is difficult to efficiently separate the catalyst from the reaction system.

The present invention aims to solve the above-mentioned problems in the fluidized bed system, and its main feature is to magnetically separate the catalyst from the reaction system as a magnetic substance.

The present invention will be explained in detail below.

In the present invention, the catalyst is a magnetic material. A common method of making the catalyst magnetic is to incorporate a metal catalyst into Ferai-F. As is well known, ferrite is MO/Fe
It is a divalent metal salt of type 2O3 and exhibits ferrimagnetism.
In particular, those having an inverse spinel type (14 structure) exhibit ferromagnetism. M is a metal that serves as a catalyst, such as Fe or Co in the case of an oxidation catalyst or a reduction catalyst.

These are Ni, Rh, T'd, Pt'$σ disk group metals or Ib group metals such as Cu, Ag, and Au. When the metal is incorporated into ferrite, it becomes magnetic as described above, but it also has the unexpected effect of preventing elution when the reaction system is an aqueous solution. [Above] □ Urite catalyst is produced by, for example, adding Fe2O3 powder to an aqueous solution of the salt of M, heating and stirring, and then taking out the packed Fe2O3 and reducing and calcining it. is formed. Further, the catalyst of the present invention may be supported on a carrier such as a plastic such as polyethylene, polypropylene, polyvinyl chloride, or polyamide, or a ceramic such as silica or alumina. In order to support the catalyst of the present invention on the above-mentioned carrier, a mechanochemical method of kneading in a ball mill, for example, is used.

In order to easily disperse the catalyst of the present invention in the reaction system, it is desirable that the specific gravity approximates the specific gravity of the reaction system.

FIG. 1 shows an embodiment of the present invention. In the figure, (1) is a storage tank for the reaction liquid, and the reaction liquid is introduced into the relay tank (3) through the introduction path (2) K interposed by the pump (2) A.
In the relay tank (3), the catalyst of the present invention (4 ml) is added and stirred and dispersed by the stirrer (3) A. After the catalyst (4) is dispersed, the reaction liquid is passed through the communication path ( 5) In the case of an oxidation reaction, air, other oxygen-containing gases, enzyme gases, ozone, and oxidizing agents such as hydrogen oxide are introduced into the reaction column (6) by K. The reaction liquid reacted in the reaction tower (6) becomes a reaction product liquid and is sent to the separation tank (I) via the communication path (8).
Introduced in Q. A magnetic filter (9
) will be installed. The magnetic filter (9) is
)A and an excitation coil (9)B that magnetizes the filtration medium. Thus, in the separation tank OI, the magnetic filter (9)
As a result, the catalyst (4) is efficiently and substantially completely returned to 1C, and the reaction product liquid is discharged from the discharge path aTJ. Touch 1
f! (4) When the force is collected by the predetermined total magnetic filter *-rg, the introduction of the reaction product liquid to the separation tank OI is temporarily stopped and backwash water is injected from the discharge diameter m (11J to the separation tank 01). , the catalyst (4) collected on the magnetic filter (9) is backwashed, and the catalyst (4) is returned to the relay f* C3) from the return path Q3 for reuse.

The present invention is not limited to the above embodiments; for example, the reaction system may be a gas.

First, since the present invention uses magnetic catalyst bodies as the fluidized bed catalyst as described above, the reaction bale core catalyst can be effectively separated magnetically.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the present invention. In the figure, (4)...catalyst, (6)...reaction tower, (
9)...magnetic filter, 00...bunkyo tank

Claims (1)

[Claims] A reaction method characterized by applying magnetic catalyst bodies to a reaction system using a fluidized bed method, and magnetically separating the magnetic catalyst bodies from the reaction system after the reaction.