CN221268138U - Crude phthalic anhydride pretreatment equipment - Google Patents
Crude phthalic anhydride pretreatment equipment Download PDFInfo
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- CN221268138U CN221268138U CN202323242138.6U CN202323242138U CN221268138U CN 221268138 U CN221268138 U CN 221268138U CN 202323242138 U CN202323242138 U CN 202323242138U CN 221268138 U CN221268138 U CN 221268138U
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- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 title claims abstract description 53
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 238000005192 partition Methods 0.000 claims abstract description 65
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 239000007789 gas Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 239000002893 slag Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 238000010992 reflux Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 12
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 14
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical group CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- IVLRWAWNKKMBFT-UHFFFAOYSA-N 2-benzofuran-1,3-dione;naphthalene Chemical compound C1=CC=CC2=CC=CC=C21.C1=CC=C2C(=O)OC(=O)C2=C1 IVLRWAWNKKMBFT-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229940078552 o-xylene Drugs 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 1
- 239000008031 plastic plasticizer Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model provides a crude phthalic anhydride pretreatment device, which comprises: the pretreatment tower is internally provided with a plurality of partition tower plates, and a plurality of partition tower plates are sequentially and alternately arranged on two opposite side tower walls of the pretreatment tower from top to bottom and are used for dividing the interior of the pretreatment tower into a plurality of communicated areas so as to enable materials to flow back and forth in the pretreatment tower in a baffling way; the inlet of the circulating pump is connected with the tower kettle of the pretreatment tower through a circulating pump inlet pipeline; and the inlet of the heater is connected with the outlet of the circulating pump, and the outlet of the heater is connected with the upper part and/or the middle part of the pretreatment tower through a heater outlet pipeline. The crude phthalic anhydride pretreatment equipment has compact structure, small occupied area and small heat loss, the curing time of the crude phthalic anhydride can be regulated by adjusting the liquid level in the pretreatment tower, and the intermittent deslagging pipeline additionally arranged at the bottom is more beneficial to the stable operation of the next process.
Description
Technical Field
The utility model belongs to the technical field of naphthalene phthalic anhydride production, and particularly relates to crude phthalic anhydride pretreatment equipment.
Background
Phthalic anhydride, also known as phthalic anhydride, is the organic anhydride with the greatest production and consumption, and is mainly used for producing plastic plasticizers, alkyd resins, dyes, unsaturated resins and certain medicines and pesticides, phthalic anhydride consumed by phthalate plasticizers accounts for about 60% of the total consumption of phthalic anhydride, dyes and paints account for 25%, and unsaturated resins and other products account for about 15%. At present, two phthalic anhydride raw material routes exist in industrial production, namely, an o-method for short by taking o-xylene in petrochemical industry as a raw material and a naphthalene method for short by taking naphthalene in coal chemical industry as a raw material. Industrial naphthalene is heated and vaporized, is mixed with preheated air sent by an air blower, enters a tubular fixed bed heat exchanger filled with vanadium-titanium catalysts, is subjected to oxidation reaction at 430-460 ℃ and 40-80kpa, and is subjected to alkali addition and high-temperature constant-temperature pretreatment, and then is refined to remove light components and heavy components to obtain phthalic anhydride products after the reaction gas is subjected to crude phthalic anhydride collection by a switched condensation hot-melting device.
Because the impurity of coal industry naphthalene is many, the purity is low, current crude phthalic anhydride equipment is mostly the cascade connection equipment of ladder buffer tank formula structure of trinary dress or tetrary dress, a plurality of buffer tanks exist certain installation height fall from top to bottom, rely on gravity to overflow mode messenger crude phthalic anhydride to overflow gradually to a buffer tank below from being located a buffer tank at the top, so make crude phthalic anhydride's preliminary treatment time can not be adjusted according to the production load is nimble, equipment area is great moreover, and need set up a plurality of stirring, the energy consumption is high, the fault rate is high, the maintenance is inconvenient, the heat energy loss is increaseed to bigger equipment surface area, complicated heat structure construction difficulty, the unable discharge of polymer that the preliminary treatment process produced causes downstream process pipeline to block up easily, the pump damages.
Disclosure of utility model
Aiming at the technical problems in the prior art, the embodiment of the utility model provides crude phthalic anhydride pretreatment equipment with small occupied area, low comprehensive energy consumption and adjustable pretreatment time.
The technical scheme adopted by the embodiment of the utility model is as follows: a crude phthalic anhydride pretreatment apparatus comprising:
The pretreatment tower is internally provided with a plurality of partition tower plates, and a plurality of partition tower plates are sequentially and alternately arranged on two opposite side tower walls of the pretreatment tower from top to bottom and are used for dividing the interior of the pretreatment tower into a plurality of communicated areas so as to enable materials to flow back and forth in the pretreatment tower in a baffling way;
the inlet of the circulating pump is connected with the tower kettle of the pretreatment tower through a circulating pump inlet pipeline;
And the inlet of the heater is connected with the outlet of the circulating pump, and the outlet of the heater is connected with the upper part and/or the middle part of the pretreatment tower through a heater outlet pipeline.
In an alternative embodiment, four partition trays are arranged in the pretreatment tower, the four partition trays are a first partition tray, a second partition tray, a third partition tray and a fourth partition tray in sequence from top to bottom, a first area is formed above the first partition tray, a second area is formed between the first partition tray and the third partition tray, a third area is formed between the third partition tray and the fourth partition tray, and a fourth area is formed below the fourth partition tray;
the crude phthalic anhydride pretreatment equipment further comprises a heat tracing system, wherein the heat tracing system is arranged on the periphery of the pretreatment tower and is used for respectively providing heat for each area in the pretreatment tower to carry out heat preservation.
In an alternative embodiment, the heat tracing system comprises a first heat tracing unit, a second heat tracing unit, a third heat tracing unit and a fourth heat tracing unit which are in one-to-one correspondence with the four areas of the pretreatment tower; the first heat tracing unit comprises a first jacket sleeved on the pretreatment tower corresponding to the first area, and a steam tracing inlet and a steam tracing outlet are arranged on the first jacket; the second heat tracing unit, the third heat tracing unit and the fourth heat tracing unit respectively comprise a second jacket sleeved on the pretreatment tower and corresponding to the second region, the third region and the fourth region, and a heat conduction oil heat tracing inlet and a heat conduction oil heat tracing outlet are arranged on the second jacket.
In an alternative embodiment, the outlet of the heater is connected to two heater outlet pipelines, one of which extends into the pretreatment tower and is located above the first partition tower plate and is used for feeding the first partition tower plate, and the other heater outlet pipeline extends into the pretreatment tower and is located between the first partition tower plate and the second partition tower plate and is used for feeding the second partition tower plate.
In an alternative embodiment, the pretreatment tower is provided with a feed line, and the feed line extends above the uppermost partition tower plate and is used for feeding the first partition tower plate; and the feeding pipeline is provided with a flow regulating valve and a flowmeter.
In an alternative embodiment, the pretreatment tower is provided with at least one double-flange liquid level meter for detecting the liquid level in the pretreatment tower.
In an alternative embodiment, a slag discharging pipeline is arranged at the bottom of the pretreatment tower, and a discharge valve is arranged on the slag discharging pipeline; and/or a manhole is arranged at the bottom of the pretreatment tower.
In an alternative embodiment, an outlet line is connected to the circulation pump outlet line between the inlet of the heater and the outlet of the circulation pump.
In an alternative embodiment, the top of the pretreatment tower is provided with an explosion-proof sheet, a tail gas vacuum outlet pipeline, a tail gas condensate reflux pipeline, a nitrogen pipeline and an alkaline agent throwing pipeline. The tail gas vacuum outlet pipeline is used for discharging light component tail gas generated in the pretreatment process; the tail gas condensate reflux pipeline is used for recycling the light components condensed outside the pretreatment tower into the pretreatment tower; the nitrogen pipeline is used for introducing nitrogen into the pretreatment tower so as to enable the top of the pretreatment tower to be in a nitrogen sealing state; the alkaline agent delivery line is used for adding solid or liquid alkaline agent into the pretreatment tower.
In an alternative embodiment, the heater is connected with a conduction oil inlet pipeline and a conduction oil outlet pipeline, the high-temperature heating oil is sent into the heater through the conduction oil inlet pipeline, and the high-temperature heating oil is discharged through the conduction oil outlet pipeline after being heated by the heater.
Compared with the prior art, the embodiment of the utility model has the beneficial effects that: the equipment main body is a pretreatment tower and is of an integrated tower structure, so that the equipment has the advantages of compact structure, small occupied area, small heat loss, less heat tracing and low comprehensive energy consumption; the external circulating pump is used for replacing the internal stirrer, so that the electric power consumption is low, the power is low, and the maintenance is convenient; the integral structure of the pretreatment tower can adjust the curing time of the crude phthalic anhydride by adjusting the liquid level in the tower, thereby ensuring the quality of phthalic anhydride products; the intermittent deslagging pipeline additionally arranged at the bottom is more beneficial to the stable operation of the next process.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model, as claimed.
An overview of various implementations or examples of the technology described in this disclosure is not a comprehensive disclosure of the full scope or all of the features of the technology disclosed.
Drawings
In the drawings, which are not necessarily drawn to scale, like numerals may describe similar components in different views. The accompanying drawings illustrate various embodiments by way of example in general and not by way of limitation, and together with the description and claims serve to explain the disclosed embodiments. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive of the present apparatus or method.
FIG. 1 is a schematic diagram of a crude phthalic anhydride pretreatment apparatus according to an embodiment of the present utility model.
Reference numerals:
1-a pretreatment tower; 2-a first partition tray; 3-a second partition tray; 4-a third partition tray; 5-fourth partition tower plate; 6-a first region; 7-a second region; 8-a third region; 9-fourth region; 10-a feed line; 11-a flow regulating valve; 12-a feed flow meter; 13-a circulation pump; 14-a heater; 15-a circulation pump inlet line; 16-circulation pump outlet line; 17-heater outlet header line; 18-a first heater outlet line; 19-a second heater outlet line; 20-opening and closing a valve; 21-a circulation pump flow meter; 22-steam tracing inlet; 23-a steam tracing outlet; 24-a heat conduction oil heat tracing inlet; 25-a heat conduction oil heat tracing outlet; 26-a first double flange level gauge; 27-a second double flange level gauge; 28-a slag discharge pipeline; 29-a discharge valve; 30-manhole; 31-an outlet line; 32-heating oil inlet line; 33-heating oil discharge line; 34-explosion-proof sheet; 35-a tail gas vacuum outlet line; 36-a tail gas condensate reflux pipeline; 37-nitrogen line; 38-alkaline agent dosing line; 39-thermometer; 40-manometer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present utility model fall within the protection scope of the present utility model.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
In order to keep the following description of the embodiments of the present utility model clear and concise, the detailed description of known functions and known components thereof have been omitted.
The embodiment of the utility model provides crude phthalic anhydride pretreatment equipment. As shown in fig. 1, the crude phthalic anhydride pretreatment apparatus mainly comprises a pretreatment tower 1, a circulation pump 13, and a heater 14.
The pretreatment column 1 is provided with a feed line 10, and the feed line 10 is used for feeding the crude phthalic anhydride to be pretreated into the pretreatment column 1. The pretreatment tower 1 is internally provided with a plurality of partition tower plates which are sequentially and alternately arranged on the two opposite side tower walls of the pretreatment tower 1 from top to bottom and are used for dividing the interior of the pretreatment tower 1 into a plurality of communicated areas so as to lead materials (crude phthalic anhydride fed into the pretreatment tower 1) to flow back and forth in a baffling way in the pretreatment tower 1, as shown in figure 1.
The inlet of the circulating pump 13 is connected with the tower kettle of the pretreatment tower 1 through a circulating pump inlet pipeline 15; the inlet of the heater 14 is connected with the outlet of the circulating pump 13, and the outlet of the heater 14 is connected with the upper part and/or the middle part of the pretreatment tower 1 through the outlet pipeline of the heater 14.
The utility model changes the equipment for preprocessing the crude phthalic anhydride in the prior art into an integrated tower structure, and the preprocessing time can be flexibly adjusted by using the liquid level according to the production load; in addition, the pretreatment tower 1 forms a circulation loop by arranging the circulation pump 13, the heater 14 and the auxiliary pipelines thereof, forms forced circulation outside the tower, and replaces a plurality of built-in stirring devices by forced circulation outside the tower, thereby reducing the power consumption and facilitating the maintenance of equipment.
In some embodiments, as shown in fig. 1, four partition trays are arranged in the pretreatment tower 1, the four partition trays are a first partition tray 2, a second partition tray 3, a third partition tray 4 and a fourth partition tray 5 in sequence from top to bottom, a first area 6 is formed above the first partition tray 2, a second area 7 is formed between the first partition tray 2 and the third partition tray 4, a third area 8 is formed between the third partition tray 4 and the fourth partition tray 5, a fourth area 9 is formed below the fourth partition tray 5, and the four areas are sequentially arranged from top to bottom. The number of the partition tower plates is reasonable, so that the S-shaped baffling back and forth flow of the crude phthalic anhydride material can be met, and excessive blockage of the pretreatment tower 1 due to the number of the partition tower plates can be avoided. The crude phthalic anhydride pretreatment equipment also comprises a heat tracing system, wherein the heat tracing system is arranged on the periphery of the pretreatment tower 1 and is used for respectively providing heat for each area in the pretreatment tower 1 to carry out heat preservation. The heat tracing system not only can keep the pretreatment tower 1 warm, but also can keep the pretreatment tower 1 warm by adopting different heat sources in sections so as to meet the process requirements.
Optionally, the heat tracing system includes a first heat tracing unit, a second heat tracing unit, a third heat tracing unit, and a fourth heat tracing unit, which are in one-to-one correspondence with the four regions of the pretreatment tower 1. The four heat tracing units have basically the same structure, but the adopted heat tracing sources are different. Specifically, the first heat tracing unit comprises a first jacket sleeved on the pretreatment tower 1 corresponding to the first area 6, and a steam tracing inlet 22 and a steam tracing outlet 23 are arranged on the first jacket. The second heat tracing unit, the third heat tracing unit and the fourth heat tracing unit respectively comprise a second jacket sleeved on the pretreatment tower 1 corresponding to the second area 7, the third area 8 and the fourth area 9, and a heat conduction oil heat tracing inlet 24 and a heat conduction oil heat tracing outlet 25 are arranged on the second jacket. The first heat tracing unit in the uppermost first region 6 can use low-pressure steam tracing to prevent the tail gas at the top of the pretreatment tower 1 from being overheated. For example, the first heat trace unit may utilize low pressure steam of 0.3-0.6Mpa to heat trace the first zone 6. The second heat tracing unit, the third heat tracing unit and the fourth heat tracing unit can use high-temperature heat conduction oil for heat tracing, and the temperature in the pretreatment tower 1 is kept in a reasonable range. For example, the second heat trace unit, the third heat trace unit and the fourth heat trace unit may use 265-295 ℃ high temperature heat transfer oil to heat trace and preserve heat for the second zone 7, the third zone 8 and the fourth zone 9, respectively.
In some embodiments, as shown in fig. 1, the outlet of the heater 14 is connected to two heater 14 outlet lines, the two heater 14 outlet lines being a first heater outlet line 18 and a second heater outlet line 19, respectively. The first heater outlet line 18 extends into the pretreatment column 1 and is located above the first partition column plate 2 for feeding the material onto the first partition column plate 2, and the second heater outlet line 19 extends into the pretreatment column 1 and is located above the second partition column plate 3 and between the first partition column plate 2 and the second partition column plate 3 for feeding the material onto the second partition column plate 3. By providing two outlet lines of the heater 14 respectively connected to different height positions of the pretreatment tower 1, the material heated by the heater 14 can be returned to the pretreatment tower 1 through one or two outlet lines of the heater 14 according to the load condition of the pretreatment tower 1.
Optionally, on-off valves 20 are respectively disposed on the first heater outlet line 18 and the second heater outlet line 19 to facilitate user operation. The outlet of the heater 14 is connected with a heater outlet main pipeline 17, a first heater outlet pipeline 18 and a second heater outlet pipeline 19 are respectively connected to the heater outlet main pipeline 17, a circulating pump flowmeter 21 is arranged on the heater outlet main pipeline 17, and the circulating pump flowmeter 21 is matched with an on-off valve 20 to regulate the forced circulation flow of the crude phthalic anhydride.
The heater 14 may be heated by using high-temperature heat transfer oil, and the heating oil inlet line 32 is connected to the upper side of the heater 14, and the heating oil outlet line 33 is connected to the lower side of the heater 14. The high temperature heating oil is fed into the heater 14 through the heating oil inlet line 32 for heating the crude phthalic anhydride flowing through the heater 14, and the high temperature heating oil is cooled down and discharged from the heating oil outlet line 33, thus continuously circulating and continuously heating the crude phthalic anhydride flowing through the heater 14.
In some embodiments, as shown in fig. 1, the feed line 10 of the pretreatment column 1 extends above the first partition tray 2 for feeding onto the first partition tray 2. A flow regulating valve 11 and a feed flow meter 12 are provided on the feed line 10 for controlling the flow into the pretreatment column 1.
In some embodiments, as shown in fig. 1, at least one double flange level gauge for indicating the liquid level in the pretreatment column 1 is provided on the pretreatment column 1. The liquid level condition in the pretreatment tower 1 can be conveniently known by arranging the liquid level meter, and the liquid level in the pretreatment tower 1 can be adjusted by adjusting the feeding amount of the feeding pipeline 10, so that the pretreatment time of the crude phthalic anhydride can be adjusted.
The double-flange liquid level meter is simple and practical and has stable performance. In the embodiment, two double-flange liquid level meters are shown, namely a first double-flange liquid level meter 26 and a second double-flange liquid level meter 27, and by arranging the two liquid level meters, when one of the liquid level meters fails, the other liquid level meter can be used for monitoring the liquid level, and the continuous operation of the crude phthalic anhydride pretreatment equipment is not influenced.
In some embodiments, as shown in fig. 1, a slag discharge line 28 is provided at the bottom of the pretreatment column 1, and a discharge valve 29 is provided on the slag discharge line 28. For intermittently discharging the polymer accumulated in the column bottom generated during the pretreatment. The intermittent deslagging design ensures long-period operation of equipment and prevents downstream pipeline from being blocked and equipment from being damaged.
The bottom of the pretreatment tower 1 is also provided with a manhole 30 for thoroughly cleaning the polymer in the tower kettle during maintenance.
In some embodiments, continuing with fig. 1, an evacuation line 31 is connected to the circulation pump outlet line 16 between the inlet of the heater 14 and the outlet of the circulation pump 13. The discharge line 31 is connected to the next process to feed the crude phthalic anhydride pretreated in the pretreatment column 1 to the next process.
In some embodiments, as shown in fig. 1, the top of the pretreatment tower 1 is provided with an explosion-proof piece 34, so that overpressure during the use of the pretreatment tower 1 can be prevented, and safety is ensured. The top of the pretreatment tower 1 is provided with a tail gas vacuum outlet pipeline 35 for discharging light component tail gas generated in the pretreatment process. The top of the pretreatment tower 1 is also provided with a tail gas condensate return pipeline 36, and the light component tail gas discharged through a tail gas vacuum outlet pipeline 35 is condensed and then enters the pretreatment tower 1 through the tail gas condensate return pipeline 36 for recovering the light component in the condensed tail gas. The top of the pretreatment tower 1 is also provided with a nitrogen pipeline 37 for introducing nitrogen into the pretreatment tower 1, so that the top of the pretreatment tower 1 is in a nitrogen sealing state and is used for extinguishing fire, eliminating vacuum and the like. The top of the pretreatment tower 1 is also provided with an alkaline agent feeding pipeline 38 for feeding liquid alkaline agent or solid alkaline agent required for pretreatment into the pretreatment tower 1.
Preferably, a thermometer 39 is arranged in the middle of the pretreatment tower 1, and is used for displaying the operation temperature of the pretreatment tower 1; the top of the pretreatment tower 1 is provided with a pressure gauge 40 for displaying the operation pressure of pretreatment.
During operation, the low-pressure steam tracing of the first heat tracing unit of the first area 6 and the high-temperature heat conduction oil tracing of the second to fourth heat tracing units of the second to fourth areas 9 are firstly opened to preserve heat, the heating oil on the slightly-opened heater 14 enters the valves on the pipeline 32 and the heating oil discharge pipeline 33, and the pretreatment tower 1 and the heater 14 slowly heat until the temperature of the thermometer 39 rises to more than 150 ℃. The flow regulating valve 11 on the feed pipeline 10 is opened, the feeding load is regulated by observing the flow, crude phthalic anhydride enters the first partition column plate 2, flows into the second partition column plate 3, the third partition column plate 4 and the fourth partition column plate 5 in sequence by gravity, until entering the first partition column plate 2 of the pretreatment column 1, when the liquid level meter rises to 75% (namely, the liquid level in the pretreatment column 1 reaches 65% of the total volume in the column), the inlet pipeline 15 of the circulating pump and the valve on the inlet pipeline 15 are opened, the circulating pump 13 is started after filling the pump, the circulating pump outlet pipeline 16 and the valve on the circulating pump are opened, crude phthalic anhydride at the column bottom of the pretreatment column 1 enters the heater 14, the heating oil on the heater 14 enters the pipeline 32 and the valve on the hot oil discharge pipeline are opened, the outlet pipeline 19 of the second heater is opened, the crude phthalic anhydride circulates into the first partition column plate 2 of the pretreatment column 1, the forced circulation flow of the crude phthalic anhydride can be regulated by the circulating pump flowmeter 21 at the initial stage of equipment starting, and 0.02-0.03% of solid or liquid alkaline agent is added in proportion by the alkaline agent feeding pipeline 38, the tail gas produced in the pretreatment process is pumped out and the pretreatment process enters the light condensate reflux column 1 again after the tail gas is recycled by the condensate reflux column 1. Along with the continuous injection of the crude phthalic anhydride, the liquid levels of the first double-flange liquid level meter 26 and the second double-flange liquid level meter 27 reach 65-85%, the valves on the feeding pipeline 10 are reduced and even completely closed, the circulating pump 13 is continuously kept on to enable the crude phthalic anhydride to be forcedly circulated until the thermometer 39 reaches 255-285 ℃, the temperature is kept not lower than 24 hours, the valves on the discharging pipeline 31 are opened, the pretreated crude phthalic anhydride is extracted into the next working procedure, and the valves on the feeding pipeline 10 are opened to adjust the second flange liquid level meter to keep stable. When the production load increases, the pretreatment time can be shortened by extending the pretreatment time based on the observation of the liquid level in the pretreatment tower 1 indicated by the liquid level meter, whereas when the production load decreases, the liquid level in the pretreatment tower 1 indicated by the liquid level meter is lower. The valves on the slag discharge line 28 of the pretreatment column 1 are periodically opened to remove polymer during pretreatment to prevent downstream line plugging and equipment damage. The manhole 30 at the bottom of the pretreatment tower 1 is used for thoroughly cleaning residues in the pretreatment tower 1 when overhauling.
The above description is intended to be illustrative and not limiting, and variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art within the scope of the present disclosure. Also, the above examples (or one or more aspects thereof) may be used in combination with each other, and it is contemplated that the embodiments may be combined with each other in various combinations or permutations.
Claims (10)
1. A crude phthalic anhydride pretreatment apparatus, comprising:
The pretreatment tower is internally provided with a plurality of partition tower plates, and a plurality of partition tower plates are sequentially and alternately arranged on two opposite side tower walls of the pretreatment tower from top to bottom and are used for dividing the interior of the pretreatment tower into a plurality of communicated areas so as to enable materials to flow back and forth in the pretreatment tower in a baffling way;
the inlet of the circulating pump is connected with the tower kettle of the pretreatment tower through a circulating pump inlet pipeline;
And the inlet of the heater is connected with the outlet of the circulating pump, and the outlet of the heater is connected with the upper part and/or the middle part of the pretreatment tower through a heater outlet pipeline.
2. The crude phthalic anhydride pretreatment device according to claim 1, wherein four separation trays are arranged in the pretreatment tower, the four separation trays are a first separation tray, a second separation tray, a third separation tray and a fourth separation tray in sequence from top to bottom, a first area is formed above the first separation tray, a second area is formed between the first separation tray and the third separation tray, a third area is formed between the third separation tray and the fourth separation tray, and a fourth area is formed below the fourth separation tray;
the crude phthalic anhydride pretreatment equipment further comprises a heat tracing system, wherein the heat tracing system is arranged on the periphery of the pretreatment tower and is used for respectively providing heat for each area in the pretreatment tower to carry out heat preservation.
3. The crude phthalic anhydride pretreatment apparatus according to claim 2, wherein the heat tracing system comprises a first heat tracing unit, a second heat tracing unit, a third heat tracing unit, and a fourth heat tracing unit in one-to-one correspondence with four zones of the pretreatment column; the first heat tracing unit comprises a first jacket sleeved on the pretreatment tower corresponding to the first area, and a steam tracing inlet and a steam tracing outlet are arranged on the first jacket; the second heat tracing unit, the third heat tracing unit and the fourth heat tracing unit respectively comprise a second jacket sleeved on the pretreatment tower and corresponding to the second region, the third region and the fourth region, and a heat conduction oil heat tracing inlet and a heat conduction oil heat tracing outlet are arranged on the second jacket.
4. The crude phthalic anhydride pretreatment apparatus according to claim 2, wherein the heater outlet is connected to two heater outlet lines, one of which extends into the pretreatment column above the first partition tray for feeding the first partition tray, and the other of which extends into the pretreatment column between the first partition tray and the second partition tray for feeding the second partition tray.
5. The crude phthalic anhydride pretreatment apparatus according to claim 2, wherein a feed line is provided on the pretreatment tower, the feed line extending above the uppermost one of the partition trays for feeding the first partition tray; and the feeding pipeline is provided with a flow regulating valve and a flowmeter.
6. The crude phthalic anhydride pretreatment apparatus according to any one of claims 1 to 5, wherein at least one double flange level gauge for detecting the liquid level in the pretreatment column is provided on the pretreatment column.
7. The crude phthalic anhydride pretreatment apparatus according to any one of claims 1 to 5, wherein a slag discharge line is provided at the bottom of the pretreatment tower, and a discharge valve is provided on the slag discharge line; and/or a manhole is arranged at the bottom of the pretreatment tower.
8. The crude phthalic anhydride pretreatment apparatus according to any one of claims 1 to 5, wherein an outlet line is connected to a circulation pump outlet line between the inlet of the heater and the outlet of the circulation pump.
9. The crude phthalic anhydride pretreatment apparatus according to any one of claims 1 to 5, wherein the top of the pretreatment tower is provided with an explosion-proof sheet, a tail gas vacuum outlet line for discharging light component tail gas generated during pretreatment, a tail gas condensate return line, a nitrogen gas line, and an alkaline agent feeding line; the tail gas condensate reflux pipeline is used for recycling the light components condensed outside the pretreatment tower into the pretreatment tower; the nitrogen pipeline is used for introducing nitrogen into the pretreatment tower so as to enable the top of the pretreatment tower to be in a nitrogen sealing state; the alkaline agent delivery line is used for adding solid or liquid alkaline agent into the pretreatment tower.
10. The crude phthalic anhydride pretreatment apparatus according to any one of claims 1 to 5, wherein a conduction oil inlet line through which high-temperature heating oil is fed into the heater and a conduction oil outlet line through which the high-temperature heating oil is discharged after being heated by the heater are connected to the heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323242138.6U CN221268138U (en) | 2023-11-29 | 2023-11-29 | Crude phthalic anhydride pretreatment equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323242138.6U CN221268138U (en) | 2023-11-29 | 2023-11-29 | Crude phthalic anhydride pretreatment equipment |
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| Publication Number | Publication Date |
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| CN221268138U true CN221268138U (en) | 2024-07-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323242138.6U Active CN221268138U (en) | 2023-11-29 | 2023-11-29 | Crude phthalic anhydride pretreatment equipment |
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| Country | Link |
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| CN (1) | CN221268138U (en) |
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2023
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