Strong magnetic filtering device for mother liquor purification

Abstract

The utility model relates to the technical field of PTA (pure terephthalic acid) production devices, in particular to a mother liquor purification strong magnetic filtering device which comprises a device frame body, a filtering assembly is arranged in the device frame body, an auxiliary assembly is arranged on one side of the device frame body, the filtering assembly comprises a filter element flange, the filter element flange is fixedly connected in the device frame body, and the auxiliary assembly is arranged on the other side of the device frame body. And a filter screen bracket is mounted in the filter element flange. According to the strong magnetic filtering device for purifying the mother liquor, the filtering assembly is installed, the effect of the magnetic rod is to intercept lump materials and iron impurities in the mother liquor, the iron impurities are smaller than wall bonding materials in actual production operation, strong magnetic adsorption is adopted, and therefore a certain effect on removal of the iron impurities in a system is achieved, the iron element proportion is reduced to 0.5 PPM% from about 0.7 PPM%, and the iron element purity is improved. According to the method, the PTA mother liquor is purified, meanwhile, a wall-forming material is effectively intercepted, the pressure difference of an extraction tower is reduced, and extraction of PT acid (p-toluic acid) in the mother liquor by PX (p-xylene) is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of PTA production devices, in particular to a mother liquor purification strong magnetic filtering device. Background Art

[0002] During the PTA production process, iron impurities enter the system during the transportation of paraxylene (PX) from the source. Furthermore, iron impurities are generated during normal production processes, including equipment operation and pipeline media transportation. In the refining stage, crude TA produced in the crude oxidation stage undergoes hydrogenation, converting the impurity p-carboxybenzaldehyde (4-CBA) in the crude TA into water-soluble p-carboxybenzoic acid (PT acid). This also converts any colored impurities present into colorless impurities. The resulting material undergoes flash crystallization, which is then separated from the solution by filtration, leaving the PT acid in the mother liquor. Because PT acid crystallizes easily due to temperature, the temperature must be above its dissolution temperature. Iron impurities in the mother liquor are then extracted from the mother liquor. A filter is added before extraction to intercept any PT acid buildup and strongly magnetically absorb iron impurities, effectively purifying the mother liquor.

[0003] In the existing PTA industry, the refined mother liquor filter simply intercepts the wall blocks formed in the mother liquor, and has no function of reducing or removing the iron impurities involved in the mother liquor. The tiny iron impurities follow the mother liquor into the extraction tower and return to the process water after extraction, separation, distillation and other processes. The crude TA produced by oxidation passes through the refined preheater tubes and forms iron-containing salt impurities due to the high temperature, which adheres to the inner wall of the tubes, affecting the operation cycle of the device. Utility Model Content

[0004] The purpose of the present invention is to provide a mother liquor purification strong magnetic filtration device to solve the problem raised in the above background technology that the existing refined mother liquor filter in the PTA industry only simply intercepts the wall blocks formed in the mother liquor and has no function of reducing or removing the iron impurities involved in the mother liquor. In order to achieve the above purpose, the present invention provides the following technical solution: a mother liquor purification strong magnetic filtration device, comprising a device frame, a filter assembly is arranged inside the device frame, an auxiliary assembly is arranged on one side of the device frame, the filter assembly includes a filter element flange, the filter element flange is fixedly connected to the inside of the device frame, a filter screen bracket is installed inside the filter element flange, a strong magnetic filter screen is fixedly connected to one side of the filter screen bracket, a magnetic rod fixing ring is installed inside the strong magnetic filter screen, and a magnetic rod is installed inside the magnetic rod fixing ring.

[0005] Further preferably, the filter assembly also includes a pressing block, which is fixedly connected to the top of the filter element flange. A card slot is opened inside the filter bracket. By installing the filter assembly, the role of the magnetic rod can be realized to intercept the block materials and iron impurities in the mother liquor. The iron impurities are smaller than the wall materials in actual production operation. By using strong magnetic adsorption, the rotatable filter bracket will install the strong magnetic filter with the magnetic rod inside the device frame, thereby having a certain effect on removing iron impurities in the system, reducing the proportion of iron elements from about 0.7PPM% to 0.5PPM%, purifying the PTA mother liquor, and effectively intercepting the wall materials, reducing the pressure difference of the extraction tower, and facilitating the extraction of PT acid (para-toluic acid) in the mother liquor by PX (paraxylene).

[0006] Further preferably, the auxiliary component includes an inlet and outlet pipeline, which is fixedly connected to one side of the device frame, and the side surface of the device frame is fixedly connected with a mother liquid inlet pipe, and the side surface of the device frame is fixedly connected with a mother liquid outlet pipe. The auxiliary component also includes a filter differential pressure gauge PDT, and the filter differential pressure gauge PDT is installed on one side of the device frame, and the bottom of the device frame is fixedly connected with a pressure relief pipe. By installing the auxiliary component, the filter inlet and outlet pipelines can be installed with a differential pressure gauge. When the clean strong magnetic filter is put into use, as the use time increases, the strong magnetic filter mesh is blocked and the mother liquid flow rate is reduced, causing the differential pressure gauges before and after the filter to rise. At this time, when the filter differential pressure gauge PDT is monitored to rise to a certain value, it is isolated. At this time, the hand valve on the filter inlet and outlet pipelines is closed, and the pressure relief pipe at the bottom of the filter is opened. After the pressure is released, the head is removed, the strong magnetic filter mesh is screwed out, and put back after cleaning.

[0007] Further preferably, the side surface of the device frame is fixedly connected with fixing bolts, and a plurality of the fixing bolts are symmetrically distributed on the side surface of the device frame.

[0008] Further preferably, a front support plate is fixedly connected to the bottom of the pressure relief pipe, and a rear support plate is fixedly connected to the side surface of the device frame.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] In the utility model, by installing a filter component, the function of the magnetic rod can be realized to intercept the block materials and iron impurities in the mother liquor. The iron impurities are smaller than the wall materials in actual production operation. By using strong magnetic adsorption, the rotatable filter bracket can install the strong magnetic filter with the magnetic rod inside the device frame, thereby having a certain effect on the removal of iron impurities in the system, reducing the proportion of iron elements from about 0.7PPM% to 0.5PPM%, purifying the PTA mother liquor, and effectively intercepting the wall materials, reducing the pressure difference of the extraction tower, and facilitating the extraction of PT acid (para-toluic acid) in the mother liquor by PX (paraxylene). BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0013] Figure 3 For this utility model Figure 2 A in the middle is an enlarged structural diagram;

[0014] Figure 4 This is a schematic diagram of the detailed structure of a partial section of the utility model;

[0015] Figure 5 For this utility model Figure 4 Enlarged structural diagram at point B in the middle.

[0016] In the figure: 1. Device frame; 2. Filter assembly; 201. Filter element flange; 202. Filter screen bracket; 203. Strong magnetic filter screen; 204. Magnetic rod fixing ring; 205. Magnetic rod; 206. Pressing block; 207. Card slot; 3. Auxiliary assembly; 301. Inlet and outlet pipelines; 302. Mother liquor inlet pipe; 303. Mother liquor outlet pipe; 304. Filter differential pressure gauge PDT; 305. Pressure relief pipe; 4. Fixing bolts; 5. Front support plate; 6. Rear support plate. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 5 The utility model provides a technical solution: a mother liquor purification strong magnetic filtration device, including a device frame 1, a filter assembly 2 is arranged inside the device frame 1, an auxiliary assembly 3 is arranged on one side of the device frame 1, the filter assembly 2 includes a filter element flange 201, the filter element flange 201 is fixedly connected to the inside of the device frame 1, a filter screen bracket 202 is installed inside the filter element flange 201, a strong magnetic filter screen 203 is fixedly connected to one side of the filter screen bracket 202, a magnetic rod fixing ring 204 is installed inside the strong magnetic filter screen 203, and a magnetic rod 205 is installed inside the magnetic rod fixing ring 204.

[0019] In this embodiment, Figure 1 、 Figure 2 and Figure 3As shown, the filter assembly 2 also includes a pressing block 206, which is fixedly connected to the top of the filter element flange 201. A card slot 207 is provided inside the filter bracket 202. By installing the filter assembly 2, the magnetic rod 205 can be used to intercept the block materials and iron impurities in the mother liquor. The iron impurities are smaller than the wall materials in actual production operation. By using strong magnetic adsorption, the rotatable filter bracket 202 can install the strong magnetic filter 203 with the magnetic rod 205 inside the device frame 1.

[0020] In this embodiment, Figure 1 、 Figure 2 and Figure 3 As shown, the auxiliary component 3 includes an inlet and outlet pipeline 301, which is fixedly connected to one side of the device frame 1. The side surface of the device frame 1 is fixedly connected to a mother liquid inlet pipe 302, and the side surface of the device frame 1 is fixedly connected to a mother liquid outlet pipe 303. The auxiliary component 3 also includes a filter differential pressure gauge PDT304, which is installed on one side of the device frame 1. The bottom of the device frame 1 is fixedly connected to a pressure relief pipe 305. By installing the auxiliary component 3, the filter inlet and outlet pipelines 301 can be installed with a pressure differential gauge. When the clean strong magnetic filter is put into use, as the use time increases, the strong magnetic filter 203 is blocked and the mother liquid flow rate is reduced, resulting in an increase in the pressure differential gauges before and after the filter. At this time, when the filter differential pressure gauge PDT304 rises to a certain value, it is isolated. At this time, the hand valve on the filter inlet and outlet pipelines 301 is closed, and the pressure relief pipe 305 at the bottom of the filter is opened. After the pressure is released, the head is disassembled, the strong magnetic filter 203 is swung out, and put back after cleaning.

[0021] In this embodiment, Figure 1 、 Figure 2 and Figure 3 As shown, the side surface of the device frame 1 is fixedly connected with fixing bolts 4 , and a plurality of fixing bolts 4 are symmetrically distributed on the side surface of the device frame 1 .

[0022] In this embodiment, Figure 1 、 Figure 2 and Figure 3 As shown, the bottom of the pressure relief pipe 305 is fixedly connected to the front support plate 5 , and the side surface of the device frame 1 is fixedly connected to the rear support plate 6 .

[0023] The use method and advantages of this utility model: When the mother liquor purification strong magnetic filter device is used, the working process is as follows:

[0024] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, first, by installing the filter component 2, the function of the magnetic rod 205 can be realized to intercept the block materials and iron impurities in the mother liquor, and the iron impurities are smaller than the wall materials in actual production operation. By using strong magnetic adsorption, the rotatable filter bracket 202 will install the strong magnetic filter 203 with the magnetic rod 205 inside the device frame 1, and then by installing the auxiliary component 3, the pressure differential gauge can be installed on the filter inlet and outlet pipelines 301. When the clean strong magnetic filter is put into use, as the use time increases, the strong magnetic filter 203 blocks the mother liquor flow rate and causes the pressure differential gauges before and after the filter to rise. At this time, when the filter pressure differential gauge PDT304 is monitored to rise to a certain value, it is isolated. At this time, the hand valve on the filter inlet and outlet pipelines 301 is closed, and the pressure relief pipe 305 at the bottom of the filter is opened. After the pressure is released, the head is disassembled, the strong magnetic filter 203 is screwed out, and put back after cleaning.

[0025] The above shows and describes the basic principles, main features, and advantages of the present invention. Persons skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A mother liquor purification strong magnetic filtration device, comprising a device frame (1), characterized in that: A filter assembly (2) is provided inside the device frame (1), an auxiliary assembly (3) is provided on one side of the device frame (1), the filter assembly (2) comprises a filter element flange (201), the filter element flange (201) is fixedly connected to the inside of the device frame (1), a filter screen bracket (202) is installed inside the filter element flange (201), a strong magnetic filter screen (203) is fixedly connected to one side of the filter screen bracket (202), a magnetic rod fixing ring (204) is installed inside the strong magnetic filter screen (203), and a magnetic rod (205) is installed inside the magnetic rod fixing ring (204).

2. The mother liquor purification strong magnetic filtration device according to claim 1, characterized in that: The filter assembly (2) further comprises a pressing block (206), wherein the pressing block (206) is fixedly connected to the top of the filter element flange (201), and a clamping slot (207) is provided inside the filter screen bracket (202).

3. The mother liquor purification strong magnetic filtration device according to claim 1, characterized in that: The auxiliary component (3) includes an inlet and outlet pipeline (301), and the inlet and outlet pipeline (301) is fixedly connected to one side of the device frame (1). The side surface of the device frame (1) is fixedly connected to a mother liquid inlet pipeline (302), and the side surface of the device frame (1) is fixedly connected to a mother liquid outlet pipeline (303).

4. The mother liquor purification strong magnetic filtration device according to claim 3, characterized in that: The auxiliary component (3) further comprises a filter differential pressure gauge PDT (304), which is mounted on one side of the device frame (1), and a pressure relief pipe (305) is fixedly connected to the bottom of the device frame (1).

5. The mother liquor purification strong magnetic filtration device according to claim 1, characterized in that: The side surface of the device frame (1) is fixedly connected with a fixing bolt (4), and a plurality of the fixing bolts (4) are symmetrically distributed on the side surface of the device frame (1).

6. The mother liquor purification strong magnetic filtration device according to claim 4, characterized in that: The bottom of the pressure relief pipe (305) is fixedly connected to a front support plate (5), and the side surface of the device frame (1) is fixedly connected to a rear support plate (6).

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