Evaporation equipment for terephthalic acid film

Abstract

The utility model belongs to the technical field of terephthalic acid application, and particularly discloses terephthalic acid film evaporation equipment. Comprising a bottom pedestal, a heating oil tank, a raw material liquid high-pressure pump, a liquid storage tank, a heating oil circulating pump, a group of vertical plates, a terephthalic acid film layer, an open shell, a tank cover, a sealing ring, a hollow heating sleeve, a liquid inlet pipe, a steam condensation outlet, a transition guide pipe with a valve, an oil return pipe, an oil inlet pipe with a valve, a transition connecting guide pipe, a plurality of transverse liquid guide pipes, a circular liquid distribution head and a circular liquid distribution cavity, and a plurality of liquid spraying nozzles and a return pipe. The terephthalic acid film evaporation equipment disclosed by the utility model has the beneficial effects that wastewater containing terephthalic acid in the recovery process is primarily and efficiently evaporated, so that the subsequent efficient and high-quality rectification recovery of the terephthalic acid is improved; the whole component parts are of a split type design structure, assembly, disassembly and maintenance are convenient, meanwhile, skid-mounted and vertical design is adopted in the whole, transportation is convenient, and the occupied area is small.

Description

Technical Field

[0001] The utility model belongs to the technical field of terephthalic acid application, and particularly relates to a thin film evaporation device for terephthalic acid. Background Technique

[0002] Terephthalic acid, with the molecular formula C8H6O4, is an organic compound and is the most produced dicarboxylic acid. It is a solid at room temperature. It does not melt when heated and sublimes above 300 °C. If heated in a closed container, it can melt at 427 °C. Terephthalic acid is a raw material for the production of polyesters, especially polyethylene terephthalate (PET).

[0003] For wastewater containing terephthalic acid, etc., in order to save costs and prevent environmental pollution, it needs to be treated. And how to achieve efficient primary evaporation treatment of wastewater containing terephthalic acid is what needs to be studied and solved currently.

[0004] Therefore, based on the above problems, the utility model provides a thin film evaporation device for terephthalic acid. Summary of the Utility Model

[0005] Purpose of the utility model: The purpose of the utility model is to provide a thin film evaporation device for terephthalic acid in view of the deficiencies of the prior art, which solves the technical problems existing in the wastewater containing terephthalic acid in the background technique.

[0006] Technical solution: A thin film evaporation device for terephthalic acid provided by the utility model includes a bottom pedestal, a heating oil tank, a raw material liquid high-pressure pump, a liquid storage tank, a heating oil circulation pump, a group of vertical plates, and a terephthalic acid thin film layer. An open shell is provided on the inner wall of the upper part of the group of vertical plates. A box cover is provided on the upper part of the open shell. A sealing ring is provided on the inner wall of the box cover. A hollow heating jacket is provided on the outer wall of the upper part of the open shell. An inlet pipe and a steam condensation outlet are provided on the box cover. One end of the inlet pipe is provided with a valve-equipped transition conduit connected to the raw material liquid high-pressure pump. An oil return pipe and a valve-equipped inlet oil pipe connected to the heating oil tank and the heating oil circulation pump are provided on the hollow heating jacket. The other end of the inlet pipe, and located inside the upper part of the open shell, is provided with a transition connection conduit. A number of horizontal liquid guiding pipes are provided on the transition connection conduit. One end face of the horizontal liquid guiding pipe is provided with a circular liquid distribution head. An inner layer of the circular liquid distribution head is provided with a circular liquid distribution cavity. The outer layer of the circular liquid distribution head is provided with a number of liquid spraying nozzles that cooperate with the circular liquid distribution cavity. The lower part of the open shell is provided with a return pipe connected to the liquid storage tank; among them, the liquid spraying nozzles are arranged in an arc structure with the same orientation.

[0007] In this technical solution, the large end diameter of the inlet of the liquid spraying nozzle is 0.2 - 0.5 mm, and the small end diameter of the outlet of the liquid spraying nozzle is 0.02 - 0.1 mm.

[0008] For the technical solution of the present invention, the terephthalic acid thin-film evaporation device further includes a first temperature sensor and a second temperature sensor respectively arranged on the oil return pipe and the oil inlet pipe with a valve; wherein, the first temperature sensor is used to detect the temperature of the heating oil entering the hollow heating sleeve, and the second temperature sensor is used to detect the temperature of the heating oil flowing back into the heating oil tank.

[0009] For the technical solution of the present invention, the terephthalic acid thin-film evaporation device further includes vertical plate screw holes symmetrically arranged inside the upper part of the vertical plate, a group of arc-shaped mounting seats arranged on the outer wall of the upper part of the open shell, arc-shaped mounting seat screw grooves respectively arranged on one side of the arc-shaped mounting seats and used in cooperation with the vertical plate screw holes, and horizontal bolts for fixedly assembling the vertical plate and the arc-shaped mounting seats through the vertical plate screw holes and the arc-shaped mounting seat screw grooves; wherein, a group of arc-shaped mounting seats are respectively welded on the outer wall of the upper part of the open shell.

[0010] For the technical solution of the present invention, the terephthalic acid thin-film evaporation device further includes a first circular hollow fixing plate welded on the outer wall of the open shell and located below a group of arc-shaped mounting seats, circular fixing plate screw holes evenly distributed inside the first circular hollow fixing plate, a second circular hollow fixing plate welded on the upper end face of the hollow heating sleeve, screw grooves evenly distributed on one side of the second circular hollow fixing plate, and vertical bolts for fixedly assembling the first circular hollow fixing plate and the second circular hollow fixing plate through the circular fixing plate screw holes and the screw grooves.

[0011] For the technical solution of the present invention, the terephthalic acid thin-film evaporation device further includes cover screw holes arranged on the symmetric center line of the cover, a first liquid inlet pipe nut for fixing the liquid inlet pipe on the cover through the cover screw holes, and a second liquid inlet pipe nut for fixedly installing one end of the liquid inlet pipe and the transition connecting conduit; wherein, the outer wall of the liquid inlet pipe is provided with a threaded structure, and the inner wall of the transition connecting conduit is provided with a threaded structure.

[0012] Compared with the prior art, the beneficial effects of a terephthalic acid thin-film evaporation device of the present utility model are as follows: 1. It can be used for the preliminary and efficient evaporation of wastewater containing terephthalic acid during the recovery process, improving the subsequent high-efficiency and high-quality rectification and recovery of terephthalic acid; 2. The overall component is designed in a split structure, which is convenient for assembly, disassembly and maintenance. At the same time, the overall adopts a skid-mounted and vertical design, which is convenient for transportation and has a small floor area. Description of the Drawings

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 is a schematic structural diagram of a terephthalic acid thin film evaporation device of the present invention;

[0015] Figure 2 is a schematic pre-installation structural diagram of a hollow heating sleeve, a first circular hollow fixing plate, circular fixing plate screw holes, a second circular hollow fixing plate, screw grooves and vertical bolts of a terephthalic acid thin film evaporation device of the present invention;

[0016] Figure 3 is a schematic top view structural diagram of a transition connection conduit, a horizontal liquid guide pipe, a circular liquid distribution head, a circular liquid distribution cavity, a liquid spraying nozzle, etc. of a terephthalic acid thin film evaporation device of the present invention;

[0017] Among them, the serial numbers in the figure are as follows: 100 - bottom pedestal, 101 - heating oil tank, 102 - raw material liquid high-pressure pump, 103 - liquid storage tank, 1031 - liquid inlet, 1032 - liquid outlet, 104 - heating oil circulation pump, 200 - vertical plate, 201 - arc-shaped mounting seat, 202 - vertical plate screw hole, 203 - arc-shaped mounting seat screw groove, 204 - horizontal bolt, 205 - open-type housing, 206 - box cover, 207 - sealing ring, 208 - return pipe, 209 - hollow heating sleeve, 210 - oil inlet pipe with valve, 211 - return oil pipe, 212 - first circular hollow fixing plate, 213 - circular fixing plate screw hole, 214 - second circular hollow fixing plate, 215 - screw groove, 216 - vertical bolt, 217 - transition conduit with valve, 218 - box cover screw hole, 219 - liquid inlet pipe, 220 - first liquid inlet pipe nut, 221 - transition connection conduit, 222 - second liquid inlet pipe nut, 223 - circular liquid distribution head, 224 - liquid spraying nozzle, 225 - steam condensation outlet, 226 - horizontal liquid guide pipe, 227 - circular liquid distribution cavity, 300 - terephthalic acid thin film layer, 2111 - first temperature sensor, 2101 - second temperature sensor. Specific embodiments

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "top", "bottom", "one side", "the other side", "front", "rear", "middle part", "inside", "top end", "bottom end", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model; the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Embodiment 1

[0020] As Figure 1 、 Figure 2 and Figure 3 shown, a terephthalic acid thin-film evaporation device includes a bottom pedestal 100, a heating oil tank 101, a raw material liquid high-pressure pump 102, a liquid storage tank 103, a heating oil circulation pump 104, a group of vertical plates 200, and a terephthalic acid thin-film layer 300.

[0021] An open shell 205 is provided on the upper inner wall of a group of vertical plates 200.

[0022] A box cover 206 is provided on the upper part of the open shell 205.

[0023] A sealing ring 207 is provided on the inner wall of the box cover 206.

[0024] A hollow heating sleeve 209 is provided on the upper outer wall of the open shell 205.

[0025] A liquid inlet pipe 219 and a steam condensation outlet 225 are provided on the box cover 206.

[0026] One end of the liquid inlet pipe 219 is provided with a valve-equipped transition conduit 217 connected to the raw material liquid high-pressure pump 102.

[0027] On the hollow heating jacket 209, there are a return oil pipe 211 and a valve-equipped inlet oil pipe 210 connected to the heating oil tank 101 and the heating oil circulation pump 104.

[0028] The other end of the liquid inlet pipe 219, and inside the upper part of the open shell 205, there is a transition connection conduit 221.

[0029] On the transition connection conduit 221, there are several horizontal liquid guide pipes 226.

[0030] One end face of the horizontal liquid guide pipe 226 is provided with a circular liquid distribution head 223.

[0031] Inside the circular liquid distribution head 223, there is a circular liquid distribution cavity 227.

[0032] Outside the circular liquid distribution head 223, there are several spray nozzles 224 that cooperate with the circular liquid distribution cavity 227.

[0033] At the lower part of the open shell 205, there is a return pipe 208 connected to the liquid storage tank 103.

[0034] Among them, the spray nozzles 224 are set as an arc structure with the same orientation. The spray nozzles 224 evenly spray the terephthalic acid-containing thin wastewater in the liquid storage tank 103 on the inner wall of the open shell 205. At this time, the terephthalic acid-containing thin wastewater forms a thin film on the inner wall of the open shell 205 and flows downward under the action of gravity. The heating oil in the hollow heating jacket 209 heats the open shell 205 at a high temperature through heat transfer. In this way, the high-temperature heated open shell 205 evaporates (the water) the terephthalic acid-containing thin wastewater evenly sprayed on the inner wall. The evaporated water vapor is discharged from the evaporation water vapor condensation outlet 225. The evaporated terephthalic acid (high purity) enters the liquid storage tank 103 through the return pipe 208 and can perform multiple cyclic evaporation operations;

[0035] When the evaporation operation is carried out, the liquid inlet 1031 of the liquid storage tank 103 is closed. After the evaporation treatment is completed, the high-purity terephthalic acid is pumped out through the liquid outlet 1032 for subsequent in-depth treatment.

[0036] In addition, preferably, the large end diameter of the inlet of the spray nozzle 224 is 0.2 - 0.5 mm, and the small end diameter of the outlet of the spray nozzle 224 is 0.02 - 0.1 mm, which is used to evenly spray the terephthalic acid-containing thin wastewater in a mist state on the inner wall of the open shell 205. Embodiment Two

[0037] Based on Embodiment 1, the terephthalic acid thin-film evaporation device further includes a first temperature sensor 2111 and a second temperature sensor 2101 respectively arranged on the return oil pipe 211 and the valve-equipped inlet oil pipe 210;

[0038] Among them, the first temperature sensor 2111 is used to detect the temperature of the heating oil entering the hollow heating sleeve 209, and the second temperature sensor 2101 is used to detect the temperature of the heating oil flowing back into the heating oil tank 101. The above design structure monitors the temperature of the oil in the hollow heating sleeve 209 in real time and visually, realizing the control of the high-temperature evaporation temperature of the open shell 205. Embodiment 3

[0039] Based on Embodiment 1 or Embodiment 2, the terephthalic acid thin-film evaporation device further includes vertical plate screw holes 202 symmetrically arranged inside the upper part of the vertical plate 200, a set of arc-shaped mounting seats 201 arranged on the outer wall of the upper part of the open shell 205, arc-shaped mounting seat screw grooves 203 respectively arranged on one side of the arc-shaped mounting seats 201 and cooperating with the vertical plate screw holes 202, and a horizontal bolt 204 for fixedly assembling the vertical plate 200 and the arc-shaped mounting seats 201 through the vertical plate screw holes 202 and the arc-shaped mounting seat screw grooves 203;

[0040] Among them, a set of arc-shaped mounting seats 201 are respectively welded on the outer wall of the upper part of the open shell 205. The above design realizes the rapid assembly, disassembly, and maintenance of the vertical plate 200 and the arc-shaped mounting seats 201, and is also convenient for disassembly and transportation or on-site assembly. Embodiment 4

[0041] Based on Embodiment 1 or Embodiment 2 or Embodiment 3, the terephthalic acid thin-film evaporation device further includes a first circular hollow fixing plate 212 welded on the outer wall of the open shell 205 and located below a set of arc-shaped mounting seats 201, circular fixing plate screw holes 213 uniformly distributed inside the first circular hollow fixing plate 212, a second circular hollow fixing plate 214 welded on the upper end face of the hollow heating sleeve 209, screw grooves 215 uniformly distributed on one side of the second circular hollow fixing plate 214, and a vertical bolt 216 for fixedly assembling the first circular hollow fixing plate 212 and the second circular hollow fixing plate 214 through the circular fixing plate screw holes 213 and the screw grooves 215. The above design structure realizes the rapid assembly, disassembly, and maintenance of the first circular hollow fixing plate 212 and the second circular hollow fixing plate 214, and is also convenient for disassembly and transportation or on-site assembly (the hollow heating sleeve 209 and the second circular hollow fixing plate 214). Embodiment 5

[0042] Based on the first embodiment, the second embodiment, the third embodiment, or the fourth embodiment, the terephthalic acid thin-film evaporation device further includes a lid screw hole 218 provided within the symmetric centerline of the lid 206, a first inlet pipe nut 220 for fixing the inlet pipe 219 to the lid 206 through the lid screw hole 218, and a second inlet pipe nut 222 for fixedly installing one end of the inlet pipe 219 to the transition connection conduit 221;

[0043] Wherein, the outer wall of the inlet pipe 219 is provided with a threaded structure, and the inner wall of the transition connection conduit 221 is provided with a threaded structure. The above design structure forms a split component, which is convenient for transportation, on-site assembly, or disassembly and maintenance.

[0044] The working principle or structural principle of the terephthalic acid thin-film evaporation device of this structure:

[0045] Please review Figure 1 and Figure 3 :

[0046] (1) Add the terephthalic acid-containing wastewater to be evaporated into the liquid storage tank 103 through the liquid inlet 1031, and close the liquid inlet 1031;

[0047] (2) Start the heating oil circulation pump 104 to inject the heating oil tank 101 into the hollow heating jacket 209 through the oil inlet pipe 210 with a valve. The hollow heating jacket 209 performs high-temperature heating on the open shell 205 (the inner wall of the hollow heating jacket 209 is seamlessly attached to the outer wall of the open shell 205);

[0048] (3) Start the raw material liquid high-pressure pump 102 to pump the terephthalic acid-containing wastewater into the inlet pipe 219 through the transition conduit 217 with a valve, then through the transition connection conduit 221 and the horizontal liquid guide pipe 226 into the circular liquid distribution cavity 227 of the circular liquid distributor 223, and then evenly spray it in a mist form on the inner wall of the open shell 205 through a plurality of spray nozzles 224. At this time, the high-temperature heated open shell 205 performs evaporation operation on the mist-sprayed terephthalic acid-containing wastewater on its inner wall. In this way, the steam is extracted from the open shell 205 through the steam condensation outlet 225 for subsequent condensation and purification treatment, and the evaporated high-purity terephthalic acid enters the liquid storage tank 103 through the return pipe 208 and is pumped out of the liquid storage tank 103 through the liquid outlet 1032 by an external device (the liquid extraction pump is not marked in the figure and does not affect the disclosure of the technical solution of this application) for subsequent in-depth treatment.

[0049] In this structure, the heating oil tank 101, the raw material liquid high-pressure pump 102, the heating oil circulation pump 104, the first temperature sensor 2111, the second temperature sensor 2101, etc. are all conventional components or devices, and no improvement is made in this technical solution.

[0050] It should be noted that in this text, terms such as "including", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0051] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A terephthalic acid thin-film evaporation device, comprising a bottom pedestal (100), a heating oil tank (101), a raw material liquid high-pressure pump (102), a liquid storage tank (103), a heating oil circulation pump (104), a group of vertical plates (200) and a terephthalic acid thin-film layer (300), characterized in that: An open shell (205) is provided on the upper inner wall of the group of vertical plates (200), A box cover (206) is provided on the upper part of the open shell (205), A sealing ring (207) is provided on the inner wall of the box cover (206), A hollow heating sleeve (209) is provided on the upper outer wall of the open shell (205), A liquid inlet pipe (219) and a steam condensation outlet (225) are provided on the box cover (206), One end of the liquid inlet pipe (219) is provided with a valve-equipped transition conduit (217) connected to the raw material liquid high-pressure pump (102), An oil return pipe (211) and a valve-equipped oil inlet pipe (210) connected to the heating oil tank (101) and the heating oil circulation pump (104) are provided on the hollow heating sleeve (209), The other end of the liquid inlet pipe (219), and a transition connection conduit (221) is provided inside the upper part of the open shell (205), A number of horizontal liquid guide pipes (226) are provided on the transition connection conduit (221), A circular liquid distribution head (223) is provided at one end face of the horizontal liquid guide pipe (226), A circular liquid distribution cavity (227) is provided inside the circular liquid distribution head (223), A number of liquid spray nozzles (224) cooperating with the circular liquid distribution cavity (227) are provided outside the circular liquid distribution head (223), A return pipe (208) connected to the liquid storage tank (103) is provided at the lower part of the open shell (205); Among them, the liquid spray nozzles (224) are arranged in an arc structure with the same orientation.

2. The thin-film evaporation device for terephthalic acid according to claim 1, wherein: The large end diameter of the inlet of the liquid spray nozzle (224) is 0.2 - 0.5 mm, and the small end diameter of the outlet of the liquid spray nozzle (224) is 0.02 - 0.1 mm.

3. The thin film evaporation device for terephthalic acid according to claim 1 or 2, characterized in that: The terephthalic acid thin-film evaporation device further includes a first temperature sensor (2111) and a second temperature sensor (2101) respectively provided on the oil return pipe (211) and the valve-equipped oil inlet pipe (210); Among them, the first temperature sensor (2111) is used to detect the temperature of the heating oil entering the hollow heating sleeve (209), and the second temperature sensor (2101) is used to detect the temperature of the heating oil flowing back into the heating oil tank (101).

4. The thin-film evaporation device for terephthalic acid according to claim 3, wherein: The terephthalic acid thin-film evaporation device further includes vertical plate screw holes (202) symmetrically provided inside the upper part of the vertical plates (200), a group of arc-shaped mounting seats (201) provided on the upper outer wall of the open shell (205), arc-shaped mounting seat screw grooves (203) respectively provided on one side of the arc-shaped mounting seats (201) and cooperating with the vertical plate screw holes (202), and a horizontal bolt (204) for fixedly assembling the vertical plates (200) and the arc-shaped mounting seats (201) through the vertical plate screw holes (202) and the arc-shaped mounting seat screw grooves (203); Among them, a group of arc-shaped mounting seats (201) are respectively welded to the outer wall of the upper part of the open shell (205).

5. The thin film evaporation device for terephthalic acid according to claim 4, wherein: The terephthalic acid film evaporation device further includes a first circular hollow fixing plate (212) welded to the outer wall of the open shell (205) and located below a group of arc-shaped mounting seats (201), circular fixing plate screw holes (213) uniformly distributed in the first circular hollow fixing plate (212), a second circular hollow fixing plate (214) welded to the upper end face of the hollow heating sleeve (209), screw grooves (215) uniformly distributed on one side of the second circular hollow fixing plate (214), and vertical bolts (216) for fixedly assembling the first circular hollow fixing plate (212) and the second circular hollow fixing plate (214) through the circular fixing plate screw holes (213) and the screw grooves (215).

6. The thin film evaporation device for terephthalic acid according to claim 5, characterized in that: The terephthalic acid film evaporation device further includes a cover screw hole (218) provided in the symmetry center line of the box cover (206), a first inlet pipe nut (220) for fixing the inlet pipe (219) to the box cover (206) through the cover screw hole (218), and a second inlet pipe nut (222) for fixedly installing one end of the inlet pipe (219) and the transition connection conduit (221); Among them, the outer wall of the inlet pipe (219) is provided with a threaded structure, and the inner wall of the transition connection conduit (221) is provided with a threaded structure.

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