A naphthalene phthalic anhydride pre-condenser

Abstract

The application belongs to the technical field of phthalic anhydride production, and specifically discloses a naphthalene method phthalic anhydride pre-condenser, which comprises a casing and an outer shell, the casing is arranged in the inner part of the outer shell, a gas inlet pipe and a gas outlet pipe are sequentially arranged on one side of the casing from top to bottom, and the other ends of the gas inlet pipe and the gas outlet pipe both penetrate through the outer shell; the installation structure and the condenser pipe body are arranged, so that the flow direction of the gas can be limited; in the process, the flow direction of the heat exchange medium in the condenser pipe body flows from the discharge area to the treatment area, the temperature of the heat exchange medium in the treatment area is slightly higher than that in the discharge area, so that the temperature difference when the phthalic anhydride gas is just introduced into the heat exchange medium is reduced, the production of the condensate liquid is reduced, and the gas in the discharge area is just input into the cooling medium in the condenser pipe body, so that the gas preliminarily cooled in the treatment area can be further cooled under the action of the cooling medium in the condenser pipe body.

Description

Technical Field

[0001] This invention belongs to the field of phthalic anhydride production technology, and specifically discloses a naphthalene-based phthalic anhydride pre-condenser. Background Technology

[0002] Phthalic anhydride is an important basic organic chemical raw material, widely used in industries such as synthetic plastics, coatings, dyes, rubber, inks, and paints. Phthalic anhydride is a colorless, needle-like to small flake-like orthorhombic or monoclinic crystal. Industrial products are white lumps, sublime, and have a distinctive, slightly pungent odor. The naphthalene-based phthalic anhydride production process contains more impurities, and phthalic anhydride gas easily condenses after entering some condensers at 175°C, affecting subsequent condensation.

[0003] In existing condensation equipment, once the phthalic anhydride gas concentration exceeds the load, the condensation effect of phthalic anhydride gas decreases, and the condensation of impurities intensifies, affecting subsequent condensation and making fin cleaning difficult. Therefore, those skilled in the art have proposed a naphthalene-based phthalic anhydride pre-condenser to solve the above-mentioned problems. Summary of the Invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide a naphthalene-based phthalic anhydride pre-condenser to solve the problem that the prior art is not conducive to production under overload conditions.

[0005] To achieve the above objectives, the present invention provides a naphthalene-based phthalic anhydride pre-condenser, comprising a housing and an outer shell. The housing is disposed inside the outer shell. An inlet pipe and an exhaust pipe are sequentially installed on one side of the housing from top to bottom. The other ends of the inlet pipe and the exhaust pipe both extend through the outer shell. A processing module is disposed inside the housing. A condenser tube body is disposed on one side of the housing and extends into the interior of the processing module. An observation hole is provided on the top of the housing, and a phthalic anhydride concentration detector is disposed inside the observation hole.

[0006] The processing module includes an installation structure disposed inside the housing. A mounting block for shielding the installation structure is provided on one side of the housing. The surface of the mounting block is provided with a detachable connecting bolt that is threaded to the surface of the housing. The condenser pipe body is disposed inside the installation structure, and a spray structure is provided inside the housing.

[0007] In the above technical solution, preferably, the installation structure includes a connecting shell fixedly connected inside the housing, one end of the connecting shell blocking the connection between the exhaust pipe and the housing, and two guide blocks symmetrically distributed are fixedly connected to the top of the connecting shell.

[0008] In the above technical solution, preferably, the inner wall of the connecting shell is fixedly connected with a partition block, the cross-sectional shape of the partition block is a triangular star, and the partition block divides the interior of the connecting shell into three partition areas of equal area.

[0009] In the above technical solution, preferably, the three separating zones are, in counterclockwise order, a processing zone, a collection zone, and a discharge zone, wherein,

[0010] The surface of the connecting shell is provided with an air inlet that communicates with the processing area, and the surface of the partition block is provided with two sets of through holes. The processing area is connected to the collection area through one set of the through holes, and the discharge area is connected to the collection area through the other set of the through holes.

[0011] In the above technical solution, preferably, the condenser tube body is U-shaped, and both ends of the condenser tube body extend through the connecting shell, and the heat exchange medium inside the condenser tube body flows from the discharge zone to the processing zone.

[0012] In the above technical solution, preferably, one end of the connecting shell is provided with a discharge hole that communicates with the exhaust pipe, the exhaust pipe is connected to the discharge area through the discharge hole, and the bottom of the connecting shell is provided with a discharge pipe and a connecting pipe that communicate with the collection area.

[0013] In the above technical solution, preferably, the spray structure includes a pump body disposed at the bottom of the casing, the inlet end of the pump body is connected to an inlet pipe, the other end of the inlet pipe is connected to a connecting pipe, and the outlet end of the pump body is connected to a return pipe.

[0014] In the above technical solution, preferably, a fixing pipe is embedded in the inner top wall of the housing, the other end of the return pipe is connected to the fixing pipe, and the surface of the fixing pipe is connected to uniformly distributed nozzles.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. By setting the installation structure and condenser tube body, the flow direction of the gas can be restricted. During this process, since the heat exchange medium inside the condenser tube body flows from the discharge zone to the processing zone, the temperature of the heat exchange medium inside the processing zone is slightly higher than that in the discharge zone. This reduces the temperature difference with the phthalic anhydride gas when it is first introduced into the heat exchange medium, thus reducing the production of condensate. At the same time, the gas inside the discharge zone, because the cooling medium flowing inside the condenser tube body has just been introduced, can be further cooled by the cooling medium flowing inside the processing zone after initial cooling.

[0017] 2. By setting up a spray structure, the pump can be activated when the phthalic anhydride concentration inside the casing exceeds the preset value under the combined action of the spray structure and the phthalic anhydride concentration detector. The pump can extract the phthalic anhydride liquid collected in the collection area through the connecting pipe and the inlet pipe, and spray it into the inside of the casing through the return pipe and the nozzle. In this process, the gas inside can be sprayed. Since there is no problem of excessive wall temperature difference when the sprayed liquid phthalic anhydride comes into contact with the overloaded gas, the heat energy of the phthalic anhydride gas is directly absorbed by the droplets on the surface of the droplets, which can reduce the risk of scaling. At the same time, the overloaded phthalic anhydride gas can be intercepted during the contact with the droplets, thus ensuring good subsequent treatment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a partial separation diagram of the present invention;

[0020] Figure 3 This is a cross-sectional schematic diagram of the present invention;

[0021] Figure 4 This is a schematic diagram of the installation structure of the present invention;

[0022] Figure 5 This is a schematic diagram showing the distribution of the partition block, through holes, and condenser tube body of the present invention;

[0023] Figure 6 This is a schematic diagram of the spray structure of the present invention.

[0024] In the diagram: 1. Housing; 101. Inlet pipe; 102. Exhaust pipe; 103. Outer shell; 2. Condenser pipe body; 104. Observation hole; 3. Processing module; 301. Mounting block; 302. Connecting bolt; 31. Mounting structure; 3101. Guide block; 3102. Connecting shell; 3103. Discharge hole; 3104. Separator block; 3105. Inlet hole; 3106. Discharge pipe; 3107. Connecting pipe; 3108. Through hole; 3109. Separation zone; 32. Spray structure; 3201. Return pipe; 3202. Pump body; 3203. Fixing pipe; 3204. Spray head; 4. Phthalic anhydride concentration detector. Detailed Implementation

[0025] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0027] like Figures 1-6 The naphthalene-based phthalic anhydride pre-condenser shown includes a housing 1 and an outer shell 103. The housing 1 is disposed inside the outer shell 103. An inlet pipe 101 and an exhaust pipe 102 are installed sequentially from top to bottom on one side of the housing 1. The other ends of the inlet pipe 101 and the exhaust pipe 102 both extend out of the outer shell 103. A processing module 3 is disposed inside the housing 1. A condenser tube body 2 is disposed on one side of the housing 1 and extends into the interior of the processing module 3. An observation hole 104 is opened on the top of the housing 1, and a phthalic anhydride concentration detector 4 is disposed inside the observation hole 104.

[0028] The processing module 3 includes an installation structure 31 disposed inside the housing 1. A mounting block 301 for shielding the installation structure 31 is provided on one side of the housing 1. A removable connecting bolt 302 that is threaded to the surface of the mounting block 301 is provided on the surface of the mounting block 301. The condenser pipe body 2 is disposed inside the installation structure 31, and a spray structure 32 is provided inside the housing 1.

[0029] The intake pipe 101 is used to introduce untreated phthalic anhydride gas into the interior of the housing 1, and after being treated by the treatment module 3, it is discharged through the exhaust pipe 102.

[0030] The phthalic anhydride concentration detector 4 can be an online chromatograph, which can detect the concentration of phthalic anhydride inside the housing 1.

[0031] like Figures 1-6 As shown, the mounting structure 31 includes a connecting shell 3102 fixedly connected inside the housing 1. One end of the connecting shell 3102 blocks the connection between the exhaust pipe 102 and the housing 1. Two guide blocks 3101 are fixedly connected to the top of the connecting shell 3102 and are symmetrically distributed.

[0032] A partition block 3104 is fixedly connected to the inner wall of the connecting shell 3102. The cross-sectional shape of the partition block 3104 is a trident star shape. The partition block 3104 divides the interior of the connecting shell 3102 into three partition areas 3109 with equal areas.

[0033] The three partitions 3109, arranged counterclockwise, are the processing area, the collection area, and the discharge area.

[0034] The surface of the connecting shell 3102 is provided with an air inlet 3105 that communicates with the processing area, and the surface of the partition block 3104 is provided with two sets of through holes 3108. The processing area is connected to the collection area through one set of through holes 3108, and the discharge area is connected to the collection area through the other set of through holes 3108.

[0035] The condenser tube body 2 is U-shaped, and both ends of the condenser tube body 2 extend through the connecting shell 3102. The heat exchange medium inside the condenser tube body 2 flows from the discharge zone to the processing zone.

[0036] The phthalic anhydride gas entering the casing 1 can be introduced into the processing zone through the air inlet 3105 and cooled by the flow of the cooling medium inside the condenser tube body 2. Since the heat exchange medium inside the condenser tube body 2 flows from the discharge zone to the processing zone, the temperature of the heat exchange medium inside the processing zone is slightly higher than that in the discharge zone, thereby reducing the temperature difference between the phthalic anhydride gas and the heat exchange medium when it is first introduced into the heat exchange medium. The gas that has been initially cooled enters the collection zone through one set of through holes 3108 and is then introduced into the discharge zone by the action of another set of through holes 3108. This allows the gas to flow sequentially from the processing zone, the collection zone, and the discharge zone. During this process, the gas entering the discharge zone is further cooled by the cooling medium flowing inside the condenser tube body 2, as the cooling medium flowing inside the condenser tube body 2 has just been introduced. Finally, the gas is discharged into the next process through the discharge hole 3103 and the exhaust pipe 102.

[0037] During the cooling process, some phthalic anhydride gas comes into contact with the condenser tube body 2 and forms some crude phthalic anhydride liquid, which can drip through the through hole 3108 into the inside of the collection area for storage. This part of the phthalic anhydride liquid can be discharged through the discharge pipe 3106.

[0038] like Figures 1-6 As shown, one end of the connecting shell 3102 is provided with a discharge hole 3103 that communicates with the exhaust pipe 102. The exhaust pipe 102 is connected to the discharge area through the discharge hole 3103. The bottom of the connecting shell 3102 is provided with a discharge pipe 3106 and a connecting pipe 3107 that communicate with the collection area.

[0039] The spray structure 32 includes a pump body 3202 disposed at the bottom of the housing 1. The inlet end of the pump body 3202 is connected to an inlet pipe, the other end of the inlet pipe is connected to a connecting pipe 3107, and the outlet end of the pump body 3202 is connected to a return pipe 3201.

[0040] A fixed pipe 3203 is embedded in the inner top wall of the housing 1. The other end of the return pipe 3201 is connected to the fixed pipe 3203. The surface of the fixed pipe 3203 is connected to evenly distributed nozzles 3204.

[0041] Under the action of the phthalic anhydride concentration detector 4, when the phthalic anhydride concentration inside the casing 1 exceeds the preset value, the pump body 3202 can be activated. The pump body 3202 can extract the phthalic anhydride liquid collected in the collection area through the connecting pipe 3107 and the inlet pipe, and spray it into the inside of the casing 1 through the return pipe 3201 and the nozzle 3204. During this process, the gas inside can be sprayed. Since there is no problem of excessive wall temperature difference when the sprayed liquid phthalic anhydride comes into contact with the overloaded gas, the heat energy of the phthalic anhydride gas is directly absorbed by the droplets on the surface of the droplets, which can reduce the risk of scaling. At the same time, the overloaded phthalic anhydride gas can be intercepted during the contact with the droplets, thereby ensuring good subsequent treatment.

[0042] Working principle: Phthalic anhydride gas entering the casing 1 is introduced into the processing zone through the inlet 3105 and cooled by the flow of the cooling medium inside the condenser tube body 2. Since the heat exchange medium inside the condenser tube body 2 flows from the discharge zone to the processing zone, the temperature of the heat exchange medium inside the processing zone is slightly higher than that in the discharge zone, thus reducing the temperature difference between the gas and the phthalic anhydride gas when it is first introduced into the heat exchange medium. The initially cooled gas enters the collection zone through one set of through holes 3108 and is then guided into the discharge zone by another set of through holes 3108. This results in the gas flowing sequentially from the processing zone, collection zone, and discharge zone. During this process, the gas entering the discharge zone... At this point, the cooling medium flowing inside the condenser tube body 2 is newly introduced. After initial cooling in the processing zone, the gas can be further cooled by the cooling medium flowing inside the condenser tube body 2. Finally, it is discharged into the next process through the discharge hole 3103 and the exhaust pipe 102. During the cooling process, some phthalic anhydride gas will form some crude phthalic anhydride liquid after contacting the condenser tube body 2. It can drip into the collection area through the through hole 3108 and be stored inside. This part of the phthalic anhydride liquid can be discharged through the discharge pipe 3106. When the phthalic anhydride concentration inside the casing 1 exceeds the preset value, the overload can be reduced by the spray structure 32 to ensure that the concentration introduced into the next process meets the requirements.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A naphthalene-based phthalic anhydride precondenser, comprising a housing (1) and an outer shell (103), characterized in that, The housing (1) is located inside the outer shell (103). An air inlet pipe (101) and an exhaust pipe (102) are installed on one side of the housing (1) from top to bottom. The other ends of the air inlet pipe (101) and the exhaust pipe (102) both extend out of the outer shell (103). A processing module (3) is installed inside the housing (1). A condenser body (2) is installed on one side of the housing (1) and extends into the processing module (3). An observation hole (104) is opened on the top of the housing (1). A phthalic anhydride concentration detector (4) is installed inside the observation hole (104). The processing module (3) includes an installation structure (31) disposed inside the housing (1). A mounting block (301) for shielding the installation structure (31) is provided on one side of the housing (1). A removable connecting bolt (302) is provided on the surface of the mounting block (301) and threadedly connected to the surface of the housing (1). The condenser body (2) is disposed inside the installation structure (31), and a spray structure (32) is provided inside the housing (1). The mounting structure (31) includes a connecting shell (3102) fixedly connected inside the housing (1). One end of the connecting shell (3102) blocks the connection between the exhaust pipe (102) and the housing (1). Two guide blocks (3101) are fixedly connected to the top of the connecting shell (3102) and are symmetrically distributed. The inner wall of the connecting shell (3102) is fixedly connected with a partition block (3104). The cross-sectional shape of the partition block (3104) is a trident star shape. The partition block (3104) divides the interior of the connecting shell (3102) into three partition areas (3109) with equal areas. The three partition zones (3109) are, in counterclockwise order, a processing zone, a collection zone, and a discharge zone. The surface of the connecting shell (3102) is provided with an air inlet (3105) that communicates with the processing zone. The surface of the partition block (3104) is provided with two sets of through holes (3108). The processing zone is connected to the collection zone through one set of through holes (3108), and the discharge zone is connected to the collection zone through the other set of through holes (3108). The condenser tube body (2) is U-shaped, and both ends of the condenser tube body (2) extend through the connecting shell (3102). The heat exchange medium inside the condenser tube body (2) flows from the discharge zone to the processing zone.

2. The phthalic anhydride pre-condenser according to claim 1, characterized in that, One end of the connecting shell (3102) is provided with a discharge hole (3103) that communicates with the exhaust pipe (102). The exhaust pipe (102) is connected to the discharge area through the discharge hole (3103). The bottom of the connecting shell (3102) is provided with a discharge pipe (3106) and a connecting pipe (3107) that communicate with the collection area.

3. A phthalic anhydride pre-condenser according to claim 2, characterized in that, The spray structure (32) includes a pump body (3202) disposed at the bottom of the housing (1). The inlet end of the pump body (3202) is connected to an inlet pipe, the other end of the inlet pipe is connected to a connecting pipe (3107), and the outlet end of the pump body (3202) is connected to a return pipe (3201).

4. A phthalic anhydride pre-condenser according to claim 3, characterized in that, A fixed pipe (3203) is embedded in the inner top wall of the housing (1). The other end of the return pipe (3201) is connected to the fixed pipe (3203). The surface of the fixed pipe (3203) is connected to uniformly distributed nozzles (3204).

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