KR200413954Y1 - Mother liquor filtration system in the PTA or PTA process - Google Patents

Abstract

The present invention relates to a filtration system, and more particularly, a filtration system using a metal filter to perform filtration for the separation of PTA or QTA in the mother liquor containing the remaining PTA to QTA after the primary separation in the production of PTA to QTA It is about.

The mother liquor filtration system in the PTA or QTA process according to the present invention, the mother liquid inlet and the outlet of the filtered residue are respectively provided, the vertically long closed case having an openable lid and a filtration tank; A diaphragm installed in the case in an airtight structure to separate and divide the case up and down, and having a metal filter installation hole formed therein; And a cylindrical metal filter having an airtight structure penetrating up and down the metal filter installation hole of the diaphragm, the one end of which is divided by the diaphragm being opened and the other end thereof being closed. The metal filter may be formed in the form of an integrated metal plastic filter formed by compressing a metal powder in a cylindrical shape under the flange portion of a metal material having a hole formed therein and then firing the metal powder.

PTA, QTA, mother liquor, filtration, filter, metal sinter

Description

MOTHER LIQUID FILTERING SYSTEM FOR PTA OR QTA PROCESS}

 1 is a cross-sectional view showing the overall configuration of the mother liquor filtration system according to a preferred embodiment of the present invention,

FIG. 2 is an enlarged view illustrating main parts of a metal filter installed in the diaphragm of FIG. 1; FIG.

3 and 4 is a state diagram using the mother liquor filtration system according to the present invention.

*** Explanation of symbols for main parts of drawing ***

1: mother liquor filtration system

10 case 11: lid

12: filtration tank 13: mother liquor inlet

14: balance outlet

20: diaphragm 21: metal filter installation

30: metal filter 31: flange portion

32: metal sintered filter part

The present invention relates to a filtration system, and more particularly, a filtration system using a metal filter that performs filtration for separation of PTA or QTA in a mother liquor containing PTA to QTA remaining after primary separation in the production of PTA to QTA. It is about.

In the production process of PTA, which is a raw material for the production of polyester, generally, a raw material, a catalyst, a solvent, and the like are put in a reactor to complete an oxidation reaction, and then an intermediate material called CTA is obtained through crystallization, separation, and drying. The product obtained by reduction reaction was again crystallized, separated, and dried to finally obtain a product called PTA. At this time, it is possible to separate most of the products by precipitation in the separation process, but some are present in a floating state in the mother liquor, and separating all the PTA remaining in the mother liquor is in terms of improving the yield of the process. All are important in terms of reducing the discharge of waste water. Recently, a QTA process has been developed and used to more easily improve the PTA process to obtain QTA as a product, and the same applies to such a QTA process.

A filtration system is used for the separation of PTA and QTA remaining in the mother liquor. In the conventional filtration system, a filter member formed by processing and joining a flat metal sintering filter to a cylinder liquid containing PTA to QTA While passing through the out-of-pass method, the remaining PTA or QTA was separated by filtration on the inner wall of the filter member.

However, in such a conventional filtration system, since the metal filter of the flat plate type metal sintering filter was joined to each other by welding and bonded to the flange was used, the welded portion could not withstand the pressure of the liquid flow and damaged as time passed. In addition, the durability is not only weak, and because the mother liquor passes through the filter member in an in-out manner, the filtered PTA is deposited inside the filter member, and thus there is a problem that the collection of them is very cumbersome.

The present invention is to solve the problems in the conventional filtration system as described above, PTA to QTA remaining in the mother liquor in the PTA to QTA process is improved in durability, easy to collect and clean the filtered product It is an object of the present invention to provide a filtration system for the separation of filtration.

The mother liquor filtration system in the PTA or QTA process according to the present invention for achieving the above object,

An upper and lower portions of the mother liquid inlet and the outlet of the filtered residue are respectively provided, the upper and lower sealed case having an openable lid and a filtration tank; A diaphragm installed in the case to separate the case up and down to partition the filtration unit and the remaining liquid outflow part; And a cylindrical metal filter having an airtight structure penetrating up and down the metal filter installation hole of the diaphragm, the one end of which is divided by the diaphragm being opened and the other end thereof being closed. It is configured to filter and separate the PTA or QTA contained in the mother liquor in the PTA or QTA process while passing through the metal filter,

The metal filter is characterized in that the metal powder is formed in the form of an integral metal plastic filter formed by compressing the metal powder in a cylindrical shape in the lower portion of the flange portion of the metal material having a through-hole.

In the above configuration, preferably, two or more metal filters are provided, and an end portion of the metal filter exposed to the residue outlet part partitioned by the diaphragm is opened and an end portion of the metal filter led to the filtration part side is opened. Consisting of a closed structure, the mother liquid introduced through the inlet of the mother liquid is filtered out through the metal filter in an out-in manner and flows out to the outlet. The lower side forms a filtration unit.

More preferably, the upper and lower portions of the case further include a backwashing fluid inlet and a discharge port of the mother liquor including PTA or QTA separated by filtration.

Hereinafter, with reference to the accompanying drawings, it will be described in more detail the mother liquor filtration system according to the present invention.

 1 is a cross-sectional view showing the entire configuration of the mother liquor filtration system according to a preferred embodiment of the present invention, Figure 2 is an enlarged view showing the main portion showing a state in which a metal filter installed in the diaphragm in Figure 1, Figure 3 and Figure 4 is a state diagram using the mother liquor filtration system according to the present invention.

Referring to FIG. 1, the mother liquor filtration system in the PTA or QTA process according to the present embodiment includes a case 10, a diaphragm 20 and a metal filter 30 mounted inside the case 10 as a whole. It is configured to include.

Here, the case 10 is a vertically long closed structure having an openable lid 11 and a cylindrical filtration tank 12 at the bottom, and the inlet 13 of the mother liquor which requires filtration at the lower left and upper right of the drawing, respectively. And the outlet 14 of the remaining liquid, which are connected to the inlet 15 and the outlet 16 provided with valves 15a and 16a, respectively, so that the mother liquor introduced into the inlet 13 is the case 10. The filter is made while passing through the metal filter 30 in the process of moving from the lower left to the upper right of the outlet 14 to flow out.

On the other hand, at the lower end and the upper end of the lid 11 and the filtration tank 12 of the case 10, stepped portions 11a and 12a for installing a diaphragm are respectively formed therebetween, so that the diaphragm 20 is It is installed in a form that is bound to accommodate the upper end of the filtration tank 12 across.

A plurality of metal filters 30 are installed in the diaphragm 20, and the filtration unit A in the lower part of the diaphragm and the upper liquid outflow part through which the residual liquid from which PTA or QTA is separated by filtration flows out. B) is partitioned. Therefore, this diaphragm 20 is mounted while keeping airtight so that the unfiltered mother liquid and the filtered residual liquid do not mix with each other. Airtightness is achieved by packing in a conventional manner.

Since the metal filter 30 is installed through the diaphragm 20 up and down, the diaphragm 20 is drilled with a plurality of metal filter mounting holes 21 for mounting the metal filter as shown in FIG. 2. have. Metal filter installation hole 21 may be formed more than the number of the metal filter 30 is actually mounted, in this case it should be closed using a separate hermetic member 40 as shown in FIG.

On the other hand, the metal filter 30 is a metal sintered filter unit formed by compression molding the metal powder into a cylindrical shape in the lower portion of the flange portion 31 of the metal material in which the through hole 31a is formed in the center, and then firing the metal powder ( 32) is integrally formed, the metal sintered filter unit 32 is formed with micropores of about several μm, so that the solvent contained in the mother liquid passes through the filtration process, the PTA or QTA as a solid component does not pass through It is configured to be deposited on the surface.

The metal filter 30 configured as described above is installed in the airtight structure of the flange portion 31 in the metal filter installation hole 21 of the diaphragm 20, the plurality of metal filters 30 are aligned in one diaphragm 20. In the installed state, as shown in FIG. 4, in the case of repairing or regenerating the filter, it is configured to be temporarily taken out toward the upper portion of the open filtration tank 12 so that maintenance can be easily performed.

   When the mother liquor filtration is performed by the mother liquor filtration system 1 according to the present exemplary embodiment having the above-described structure, the mother liquor of the state in which PTA and QTA are first separated in a PTA or QTA process is first described. It is introduced through the mother liquid inlet 13 formed in the lower left of the case 10 and flows into the filtration unit A of the diaphragm lower portion provided in the cylindrical filtration tank 12. The mother liquid introduced into the filtration tank 12 passes through the metal sintering filter portion 32 of the metal filter 30 from the outside to the inside, and the remaining PTA or QTA contained in the mother liquid is filtered out so that the outer wall surface of the metal sintering filter portion 32 is filtered. It is deposited on or falls below the filtration tank 12 to precipitate, and only the remaining liquid, which is a liquid component, passes through the metal filter to the remaining liquid outlet portion B formed on the diaphragm 20, and then the remaining liquid on the upper right side. It is discharged through the outlet 14.

And, as shown in Figures 1 and 3, the lid 11 and the filter tank 12 of the case 10, the mother liquor including the backwashing fluid inlet 17 and filtered PTA or QTA, respectively The outlet 18 of the is provided. Therefore, when filtration is performed for a considerable period of time and the PTA or QTA separated by filtration is deposited on the outer wall of the metal sintered filter unit 32 and the like, and the filtration efficiency is lowered, as shown in FIG. 3, the mother liquid inlet 13 and the remaining liquid outlet 14. The valves of the backwashing fluid inlet 17 and the mother liquid outlet 18, and the backwashing fluid such as the backwashing compressed air or a small amount of the washing liquid from the upper part of the metal filter 30 While passing through the in-out method as shown by the arrow to discharge the filtered PTA or QTA through the outlet (18). The valves of these backwashing fluid inlets 17 and mother liquor outlets 18 remain closed during filtration.

In the mother liquor filtration system in the PTA or QTA process according to the present invention, after using a metal filter in the form of a cylindrical metal sintered filter welded in a cylindrical shape as in the prior art, after compression molding in a cylindrical shape by itself Since the sintered integrated metal filter is used, even if it is used for a long time, the problem of low durability does not occur due to crack generation at the welded part, so it can be used for a long time, which greatly reduces the cost and time loss due to the maintenance and replacement of the filter. It can work.

In addition, since the flow of the mother liquor to be filtered is made in an out-in manner, the filtered PTA or QTA is deposited on the outer surface of the large-area filter, which not only saves effort and time due to recovery and regeneration, The efficiency of filtration is greatly improved.

Claims (5)

An upper and lower portions of the mother liquid inlet and the outlet of the filtered residue are respectively provided, the upper and lower sealed case having an openable lid and a filtration tank; A diaphragm installed in the case to separate the case up and down to partition the filtration unit and the remaining liquid outflow part; And a cylindrical metal filter having an airtight structure penetrating up and down the metal filter installation hole of the diaphragm, the one end of which is divided by the diaphragm being opened and the other end thereof being closed. While passing through the metal filter, the PTA or QTA contained in the mother liquor in the PTA or QTA process is filtered off, The metal filter is a mother-liquid filtration system according to the PTA or QTA process, characterized in that the metal powder is formed in the form of an integral metal plastic filter by compression molding the metal powder in the lower portion of the flange portion of the metal material with a through-hole formed therein. The mother liquor filtration system according to claim 1, wherein a plurality of metal filters are attached to the one diaphragm. The method of claim 1, wherein the end of the metal filter exposed to the remaining liquid outlet portion partitioned by the diaphragm is open and the end of the metal filter led to the filtering portion has a closed structure, the mother liquid introduced through the inlet of the mother liquid A mother liquor filtration system for a PTA or QTA process, characterized in that it is filtered out through a metal filter and outflowed to the outlet of the residue. 2. The mother liquor filtration system according to claim 1, wherein an upper side partitioned by the diaphragm forms a residual liquid outlet, and a lower side forms a filtration section. The mother liquor filtration system of claim 1, wherein the upper and lower portions of the case further include a mother liquor outlet including a backwashing fluid inlet and a PTA or QTA separated by filtration. .

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