CN212713308U - Production system of 2-hydroxy-3-naphthoic acid - Google Patents
Production system of 2-hydroxy-3-naphthoic acid Download PDFInfo
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- CN212713308U CN212713308U CN202021552906.1U CN202021552906U CN212713308U CN 212713308 U CN212713308 U CN 212713308U CN 202021552906 U CN202021552906 U CN 202021552906U CN 212713308 U CN212713308 U CN 212713308U
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Abstract
The utility model discloses a production system of 2-hydroxy-3-naphthoic acid, which comprises a 2-naphthol salifying reaction kettle, a carbonization device, a neutralization and filter-pressing production device, an acid precipitation device, a filter-pressing device and a drying device which are sequentially communicated; the neutralization and filter-pressing production device comprises a neutralization kettle, a first heat exchanger, a second heat exchanger and a filter press, wherein a feed inlet of the neutralization kettle is communicated with the carbonization device; this neutralization and filter-pressing apparatus for producing will be neutralized and filter-pressing process between increase indirect heating equipment and carry out the heat transfer with filtrating after the filter-pressing and neutralization liquid after the neutralization, so realized carrying out the operation of intensification to filtrating before the pickling, make full use of the heat self-loopa in the production technology process, reduce the sour cauldron steam consumption of analysing, realized the rational utilization of the energy for whole production system has practiced thrift the energy consumption and has reduced the cost.
Description
Technical Field
The utility model belongs to the technical field of 2-hydroxy-3-naphthoic acid's production, concretely relates to 2-hydroxy-3-naphthoic acid's production system.
Background
2-hydroxy-3-naphthoic acid (2, 3 acid) with molecular formula C11H8O3The compound is mainly used in dye, pigment and medicine industry, and its preparation is generally implemented by 2-naphthol salifying, carbonizing, neutralization and filter-pressing and acidThe steps of separating, filter pressing and drying are completed; the carbonization process is characterized in that a three-stage carbonization process is adopted at present, after the vacuum drying of the 2-naphthol sodium salt is finished, the carbonization kettle stops heating, carbon dioxide is introduced into the carbonization kettle to start carbonization, the carbonization is generally divided into trial carbonization, third carbonization and third distillation, the carbonization time is up to 24 hours at most, the specific principle is that 2-naphthol sodium salt reacts with carbon dioxide and then is carboxylated at the 3 position to form 2,3 disodium salt, and meanwhile, 2-naphthol is generated, but the peak of carboxylation at the 3 position in the current carbonization process comes late, the time consumption is long, and the equipment yield cannot be improved; in addition, in the existing production process, due to the characteristic that medium is easy to crystallize and separate out when being cooled, general process requirements require to use the medium to cool and then carry out filter pressing after neutralization is completed, sulfuric acid separation is needed when the filter pressing is completed, the acid separation temperature needs to be increased, steam is needed to heat, and the existing conventional process does not effectively utilize heat in the processes of heating and cooling, so that the production cost is high, and the energy utilization is unreasonable.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defects of the prior art and providing an improved production system of 2-hydroxy-3-naphthoic acid, which can fully utilize the waste heat in the production process, realize the application of the waste heat of the neutralization process to the acidification heating before the acidification process and greatly save the cost; meanwhile, carbonization and distillation can be carried out at intervals, the yield of the target product is improved while the byproduct is removed, and the degree and the rate of reaction can be greatly promoted, so that the yield of the product is further improved efficiently.
In order to achieve the above object, the utility model adopts a technical scheme that:
a production system of 2-hydroxy-3-naphthoic acid comprises a 2-naphthol salification reaction kettle, a carbonization device, a neutralization and filter-pressing production device, an acid precipitation device, a filter-pressing device and a drying device which are sequentially communicated; the neutralization and filter-pressing production device comprises a neutralization kettle, a first heat exchanger, a second heat exchanger and a filter press, wherein a feed inlet of the neutralization kettle is communicated with the carbonization device;
the first heat exchanger comprises a first hot fluid inlet, a first hot fluid outlet, a first cold fluid inlet and a first cold fluid outlet, the second heat exchanger comprises a second hot fluid inlet, a second hot fluid outlet, a second cold fluid inlet and a second cold fluid outlet, the discharge port of the neutralization kettle, the first hot fluid inlet, the first hot fluid outlet, the second hot fluid inlet, the second hot fluid outlet, the feed port of the filter press and the filtrate discharge port of the filter press are sequentially communicated, the filtrate discharge port of the filter press is respectively communicated with the first cold fluid inlet and the second cold fluid inlet, and the first cold fluid outlet and the second cold fluid outlet are respectively communicated with the acid separation device
According to some preferred and concrete aspects of the utility model, neutralization filter-pressing apparatus for producing still includes first communicating pipe, second communicating pipe and third communicating pipe, the both ends of first communicating pipe respectively with the discharge gate of neutralization cauldron with first hot-fluid import intercommunication, the both ends of third communicating pipe respectively with first hot-fluid export with second hot-fluid import intercommunication, second communicating pipe respectively with first communicating pipe third communicating pipe intercommunication.
According to some preferred and concrete aspects of the utility model, the circulating pump has concatenated on the first communicating pipe, the circulating pump sets up first communicating pipe with before the intercommunication junction of second communicating pipe.
According to some preferred aspects of the utility model, neutralization filter-pressing apparatus for producing still includes first steam sweep device, first steam sweep device with first connecting pipe intercommunication.
According to the utility model discloses a some preferred and concrete aspects, neutralization filter-pressing apparatus for producing still includes fourth communicating pipe, fifth communicating pipe and sixth communicating pipe, the both ends of fourth communicating pipe respectively with the upper portion of neutralization cauldron with third communicating pipe intercommunication, the both ends of sixth communicating pipe respectively with the second hot-fluid export with the feed inlet intercommunication of pressure filter, the both ends of fifth communicating pipe respectively with fourth communicating pipe with sixth communicating pipe intercommunication.
According to some preferred aspects of the utility model, neutralization filter-pressing apparatus for producing still includes the filtrating geosyncline, the filtrating geosyncline respectively with the filtrating discharge gate of pressure filter first cold fluid import with second cold fluid import intercommunication.
According to some preferred and concrete aspects of the utility model, filtrating geosyncline is including the filtrating buffer memory groove and the filtrating delivery outlet that communicate in proper order, filtrating buffer memory groove with the filtrating discharge gate intercommunication of pressure filter, the filtrating delivery outlet still respectively with first cold fluid import with second cold fluid import intercommunication.
According to some preferred and concrete aspects of the utility model, neutralization filter-pressing apparatus for producing still includes seventh communicating pipe, seventh communicating pipe respectively with filtrating delivery chute first cold fluid import with second cold fluid import intercommunication.
According to some preferred aspects of the utility model, the neutralization and filter-pressing apparatus for producing still includes the second steam sweep the device, the second steam sweep the device with the seventh communicating pipe intercommunication.
According to some preferred aspects of the utility model, neutralization filter-pressing apparatus for producing still includes eighth communicating pipe and sets up be used for detecting the temperature detector of inside fluid temperature on the eighth communicating pipe, eighth communicating pipe respectively with first cold flow fluid outlet with second cold flow fluid outlet intercommunication.
The utility model discloses in, hot-fluid and cold fluid are relative notion, are for distinguishing each other to define in the heat transfer as the heat-releasing fluid be called the hot-fluid, the endothermic fluid is called the cold fluid.
According to some preferred aspects of the present invention, the carbonizing device comprises a carbonizing kettle, a 2-naphthol collecting tank, a wastewater catcher, and a vacuum-pumping system, which are sequentially connected; wherein the carbonization kettle comprises a kettle body, a stirring device which is arranged on the kettle body and is used for stirring internal materials, a heating device which is arranged on the outer wall of the kettle body and is used for heating the internal materials, and a carbon dioxide gas distribution mechanism which is arranged inside the kettle body, the carbonization kettle also comprises a discharge hole arranged at the bottom of the kettle body, and a 2-sodium naphthol salt feeding pipe and a carbon dioxide gas inlet pipe which are respectively arranged at the top of the kettle body, the 2-naphthol sodium salt feeding pipe is communicated with the 2-naphthol salifying reaction kettle, the discharge hole of the carbonization kettle is communicated with the neutralization and filter-pressing production device, the carbon dioxide gas distribution mechanism comprises a gas guide tube communicated with the carbon dioxide gas inlet tube and an annular gas distribution tube communicated with the gas guide tube and positioned below the stirring device, and a plurality of through holes are formed in the annular gas distribution tube.
According to some preferred and specific aspects of the invention, the air guide extends in an up-down direction.
According to some preferred aspects of the utility model, a plurality of through-holes constitute at least two sets of through-hole battles, every through-hole battle array of group includes that n distributes equally spaced through-hole on the ring type gas distribution pipe, n more than or equal to 4, n through-hole around the lopping.
According to some preferred aspects of the utility model, at least two sets of through-hole battles, two liang through-hole battles are parallel to each other between the battle.
According to some preferred and specific aspects of the present invention, the plurality of through holes constitute 4 sets of through hole arrays arranged in the upper portion, the lower portion, the front portion and the rear portion of the circular air distribution pipe.
According to some preferred aspects of the utility model, agitating unit is including installing drive element on the cauldron body, with axis of rotation and the fixed setting that the drive element transmission is connected are in the stirring rake of axis of rotation lower part, the stirring rake includes and sets gradually along upper and lower direction in the epaxial first stirring portion of rotation and second stirring portion, first stirring portion is the first (mixing) shaft that extends along the horizontal direction, second stirring portion is including fixed setting up stirring base, the setting of tip are in under the axis of rotation on the stirring base and with stirring base constitutes a plurality of second (mixing) shafts that enclose the frame structure.
According to some preferred aspects of the present invention, the second stirring shaft extends in an up-down direction, and an upper end surface of the second stirring shaft is higher than an upper surface of the first stirring shaft.
According to some preferred aspects of the utility model, heating device establishes including covering on the cauldron body and with the cauldron body constitutes the casing of heat conduction oil runner, two at least conduction oil import and at least one conduction oil export have been seted up on the casing.
According to some specific aspects of the utility model, temperature detection mouth and pressure detection mouth have been seted up respectively to the lower part of cauldron body.
According to some particular aspects of the present disclosure, the 2-naphthol collection vat is in communication with the top of the kettle body.
Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:
the utility model discloses creatively increase indirect heating equipment between neutralization and filter-pressing process and carry out the heat transfer with filtrating after the filter-pressing and neutralization liquid after the neutralization, so realized carrying out the operation that heaies up to filtrating before the pickling, fully utilized the heat self-loopa in the production technology process, reduced the sour cauldron steam consumption of separating out, greatly practiced thrift the cost, realized the rational utilization of the energy.
Furthermore, the utility model discloses creatively combine together 2-naphthol collecting vat, waste water trap and evacuation system and carbonization cauldron, realized that carbonization operation goes on with distillation operation interval, promote the target product yield when removing the accessory substance, especially the utility model discloses improve carbonization cauldron, wherein innovatively increased the carbon dioxide gas distribution mechanism of specific structure, compare in the past simply leading-in carbon dioxide's operation, this gas distribution mechanism can be with carbon dioxide leading-in reaction material deeply, and can realize intermittent type nature ground replenishment carbon dioxide in batches, not only make the balance of reaction skew right, and reaction rate greatly improves moreover, make 3 position carboxylation peaks earlier that come, reaction consuming time greatly reduces, has promoted equipment output.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic diagram showing the overall structure of a system for producing 2-hydroxy-3-naphthoic acid according to an embodiment of the present invention;
FIG. 2 is a schematic view of the overall structure of a neutralization and filter-pressing production device in the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a carbonizing apparatus according to an embodiment of the present invention;
wherein, A, 2-naphthol salifying reaction kettle; B. a carbonization device; C. a neutralization and filter-pressing production device; D. an acid separation device; E. a filter pressing device; F. a drying device;
11. a neutralization kettle; 12. a first heat exchanger; 121. a first hot fluid inlet; 122. a first hot fluid outlet; 123. a first cold fluid inlet; 124. a first cold fluid outlet; 13. a second heat exchanger; 131. a second thermal fluid inlet; 132. a second hot fluid outlet; 133. a second cold fluid inlet; 134. a second cold fluid outlet; 14. a filter press; 15. a first communication pipe; 16. a second communicating pipe; 17. a third communicating pipe; 18. a circulation pump; 19. a first steam purge device; 1a, a fourth communicating pipe; 1b, a fifth communicating pipe; 1c, a sixth communicating pipe; 1d filtrate buffer tank; 1e, a filtrate output groove; 1f, a seventh communicating pipe; 1h, a second steam purging device; 1i, a third steam purging device; 1j, an eighth communicating pipe;
21. carbonizing the kettle; 211. a kettle body; 2121. A drive member; 2122. a rotating shaft; 21231, a first stirring shaft; 21232. a stirring base; 21233. a second stirring shaft; 2131. a first conduction oil inlet; 2132. a second heat transfer oil inlet; 2133. a heat transfer oil delivery pipe; 2141. an air duct; 2142. a ring-shaped gas distribution pipe; 215. a discharge port; 216. 2-sodium naphtholate salt feeding pipe; 217. a carbon dioxide inlet pipe; 218. a temperature detection port; 219. a pressure detection port; 22. a 2-naphthol collection tank; 23. a wastewater catcher; 24. and (4) a vacuum pumping system.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be understood in a broad sense, e.g., they may be fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless otherwise expressly stated or limited, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example (b): as shown in fig. 1 to 3, the present example provides a production system of 2-hydroxy-3-naphthoic acid, which comprises a 2-naphthol salification reaction kettle a, a carbonization device B, a neutralization and filter-pressing production device C, an acid precipitation device D, a filter-pressing device E, and a drying device F, which are sequentially communicated.
In this example, referring to fig. 2, the neutralization and pressure filtration production apparatus C includes a neutralization kettle 11, a first heat exchanger 12, a second heat exchanger 13 and a pressure filter 14, wherein the feed port of the neutralization kettle 11 is communicated with the carbonization apparatus B (specifically, can be communicated with the discharge port 215 in fig. 3); the first heat exchanger 12 comprises a first hot fluid inlet 121, a first hot fluid outlet 122, a first cold fluid inlet 123 and a first cold fluid outlet 124, the second heat exchanger 13 comprises a second hot fluid inlet 131, a second hot fluid outlet 132, a second cold fluid inlet 133 and a second cold fluid outlet 134, the discharge port of the neutralization kettle 11, the first hot fluid inlet 121, the first hot fluid outlet 122, the second hot fluid inlet 131, the second hot fluid outlet 132, the feed port of the filter press 14 and the filtrate discharge port of the filter press 14 are sequentially communicated, the filtrate discharge port of the filter press 14 is respectively communicated with the first cold fluid inlet 123 and the second cold fluid inlet 133, and the first cold fluid outlet 123 and the second cold fluid outlet 134 are respectively communicated with the acid separation device D.
In this example, the neutralization and pressure filtration production apparatus C further includes a first communicating pipe 15, a second communicating pipe 16, a third communicating pipe 17, a fourth communicating pipe 1a, a fifth communicating pipe 1b, a sixth communicating pipe 1C, and a seventh communicating pipe 1 f.
As shown in fig. 2, two ends of the first communicating pipe 15 are respectively communicated with the discharge port of the neutralization kettle 11 and the first hot fluid inlet 121, two ends of the third communicating pipe 17 are respectively communicated with the first hot fluid outlet 122 and the second hot fluid inlet 131, and the second communicating pipe 16 is respectively communicated with the first communicating pipe 15 and the third communicating pipe 17;
both ends of the fourth communicating tube 1a are respectively communicated with the upper portion of the neutralization kettle 11 and the third communicating tube 17, both ends of the sixth communicating tube 1c are respectively communicated with the second hot fluid outlet 132 and the feed inlet of the filter press 14, and both ends of the fifth communicating tube 1b are respectively communicated with the fourth communicating tube 1a and the sixth communicating tube 1 c.
Specifically, referring to fig. 2, a circulation pump 18 is connected in series to the first communication pipe 15, and the circulation pump 18 is disposed in front of a connection between the first communication pipe 15 and the second communication pipe 16.
In this example, the second communication pipe 16 can be used as a backup pipe to avoid the whole apparatus from being inoperable when the third communication pipe 17 is in a situation.
In this example, the neutralization and pressure filtration production apparatus C further includes a filtrate ground tank, and the filtrate ground tank is respectively communicated with the filtrate discharge port of the pressure filter 14, the first cold fluid inlet 123, and the second cold fluid inlet 133. Specifically, referring to fig. 2, the filtrate storage tank includes a filtrate buffer tank 1d and a filtrate output tank 1e which are sequentially communicated, the filtrate buffer tank 1d is communicated with the filtrate outlet of the filter press 14, and the filtrate output tank 1e is further communicated with the first cold fluid inlet 123 and the second cold fluid inlet 133, respectively.
The seventh communicating tube 1f communicates with the filtrate outlet tank 1e, the first cold fluid inlet 123 and the second cold fluid inlet 133, respectively.
In this example, the neutralization and pressure filtration production apparatus C further includes a first steam purge device 19, a second steam purge device 1h, and a third steam purge device 1i, the first steam purge device 19 is communicated with the first communication pipe 15, the second steam purge device 1h is communicated with the seventh communication pipe 1f, and the third steam purge device 1i is communicated with the third communication pipe 17. The steam purging is added at the inlet and the outlet of the heat exchanger, the problem of pipeline crystallization can be solved by periodically purging, and some residual substances in the pipeline can be cleaned, recycled and reused.
In this example, the neutralization and filter-pressing production apparatus C further includes an eighth communication pipe 1j and a temperature detector provided on the eighth communication pipe 1j for detecting the temperature of the internal fluid, and the eighth communication pipe 1j is respectively communicated with the first cold fluid outlet 124 and the second cold fluid outlet 134. The temperature detector can know the specific value of the temperature of the filtrate which finally flows to the acid separation device D in the subsequent process in the heat exchange process, and then the steam of the acid separation kettle can be supplemented properly as required to meet the acid separation requirement.
As shown in fig. 3, the carbonization device of this example includes a carbonization kettle 21, a 2-naphthol collection tank 22, a wastewater catcher 23 and a vacuum pumping system 24 which are connected in sequence; the carbonization kettle 21 comprises a kettle body 211, a stirring device which is arranged on the kettle body 211 and is used for stirring internal materials, a heating device which is arranged on the outer wall of the kettle body 211 and is used for heating the internal materials, and a carbon dioxide gas distribution mechanism which is arranged inside the kettle body 211, the carbonization kettle 21 also comprises a discharge port 215 which is arranged at the bottom of the kettle body 211, and a 2-naphthol sodium salt feeding pipe 216 and a carbon dioxide gas inlet pipe 217 which are respectively arranged at the top of the kettle body 211, wherein the 2-naphthol sodium salt feeding pipe 216 is communicated with a 2-naphthol salifying reaction kettle A, and the discharge port 215 of the carbonization kettle 21 is communicated with a neutralization and filter-pressing production device C; the carbon dioxide gas distribution mechanism comprises a gas guide pipe 2141 communicated with the carbon dioxide gas inlet pipe 217 and an annular gas distribution pipe 2142 communicated with the gas guide pipe 2141 and positioned below the stirring device, and the annular gas distribution pipe 2142 is provided with a plurality of through holes.
In this embodiment, the gas guiding tube 2141 extends in the vertical direction so as to extend into the reaction material to improve the contact effect between the carbon dioxide and the reaction material.
In this example, the plurality of through holes form at least two sets of through hole arrays, each set of through hole array includes n through holes distributed on the annular air distribution pipe 2142 at equal intervals, n is greater than or equal to 4, and the n through holes are looped around. Furthermore, in the at least two groups of through hole arrays, every two through hole arrays are parallel to each other. In practical operation, the plurality of through holes in this embodiment may form 4 sets of through hole arrays respectively arranged at the upper portion, the lower portion, the front portion and the rear portion of the annular gas distribution pipe 2142, so that the carbon dioxide can be uniformly distributed in the reaction materials in all directions, the reaction rate and efficiency are improved, the reaction process is accelerated, and the yield of the target product is improved.
In this embodiment, the stirring device includes a driving member 2121 mounted on the tank body 211, a rotating shaft 2122 in transmission connection with the driving member 2121, and a stirring paddle fixedly disposed at a lower portion of the rotating shaft 2122, the stirring paddle includes a first stirring portion and a second stirring portion sequentially disposed on the rotating shaft 2122 in the up-down direction, the first stirring portion is a first stirring shaft 21231 extending in the horizontal direction, the second stirring portion includes a stirring base 21232 fixedly disposed at a lower end portion of the rotating shaft 2122, and a plurality of second stirring shafts 21233 disposed on the stirring base 21232 and forming a surrounding frame structure with the stirring base 21232.
In this example, the purpose of adopting two stirring portions is in order to obtain the stirring to the different orientations of reaction material to make the collision convection current take place between reaction material self, and then promote reaction material's area of contact, promote reaction rate, reduce carbonization reaction time, promote production efficiency.
In this example, the stirring base 21232 may be formed by connecting a plurality of metal stirring rods to each other, and a gap allowing a fluid to pass therethrough is formed.
Specifically, the second agitating shaft 21233 in this example extends in the up-down direction, and the upper end surface of the second agitating shaft 21233 is higher than the upper surface of the first agitating shaft 21231.
In this embodiment, the heating device includes a casing covering the kettle body 211 and forming a heat transfer oil flow channel with the kettle body 211, the casing is provided with at least two heat transfer oil inlets (in this embodiment, a first heat transfer oil inlet 2131 and a second heat transfer oil inlet 2132) and at least one heat transfer oil outlet, and the heat transfer oil outlet and the heat transfer oil delivery pipe 2133. In the embodiment, double heat conduction oil inlets are adopted, so that the heating rate can be greatly increased.
In this example, a temperature detection port 218 and a pressure detection port 219 are provided in the lower part of the autoclave body 211, respectively, so that the reaction state in the carbonization autoclave 21 can be monitored at any time.
In this example, 2-naphthol collection tank 22 is in communication with the top of kettle body 211.
In this example, the 2-naphthol collection tank 22 and the waste water trap 23 are heat exchangers commonly used in the prior art, and the specific structures of the heat exchangers are not described in detail herein, such as condensing the distilled 2-naphthol or condensing the hot steam.
In this example, other devices such as the 2-naphthol salifying reaction kettle A, the acid precipitation device D, the filter pressing device E and the drying device F can be conventional devices in the prior art.
To sum up, the utility model discloses creatively increase indirect heating equipment between neutralization and filter-pressing process and carry out the heat transfer with the filtrating after the filter-pressing and the neutralization liquid after the neutralization, especially the setting of two-stage heat transfer, snatched neutralization heat with the maximize, and the crystallization jam condition that the corresponding heat transfer probably takes place, the utility model discloses steam purging device has still been increased. Through the arrangement, the operation of heating up the filtrate before acid washing is realized, the heat self-circulation in the production process is fully utilized, the steam consumption of the acid precipitation kettle is reduced, the cost is greatly saved, and the reasonable utilization of energy is realized.
Furthermore, the utility model discloses creatively combine together 2-naphthol collecting vat, waste water trap and evacuation system and carbonization cauldron, realized that carbonization operation goes on with distillation operation interval, promote the target product yield when removing the accessory substance, especially the utility model discloses improve carbonization cauldron, wherein innovatively increased the carbon dioxide gas distribution mechanism of specific structure, compare in the past simply leading-in carbon dioxide's operation, this gas distribution mechanism can be with carbon dioxide leading-in reaction material deeply, and can realize intermittent type nature ground replenishment carbon dioxide in batches, not only make the balance of reaction skew right, and reaction rate greatly improves moreover, make 3 position carboxylation peaks earlier that come, reaction consuming time greatly reduces, has promoted equipment output.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. The production system of the 2-hydroxy-3-naphthoic acid is characterized by comprising a 2-naphthol salification reaction kettle, a carbonization device, a neutralization and filter-pressing production device, an acid precipitation device, a filter-pressing device and a drying device which are sequentially communicated; the neutralization and filter-pressing production device comprises a neutralization kettle, a first heat exchanger, a second heat exchanger and a filter press, wherein a feed inlet of the neutralization kettle is communicated with the carbonization device;
the first heat exchanger comprises a first hot fluid inlet, a first hot fluid outlet, a first cold fluid inlet and a first cold fluid outlet, the second heat exchanger comprises a second hot fluid inlet, a second hot fluid outlet, a second cold fluid inlet and a second cold fluid outlet, the discharge port of the neutralization kettle, the first hot fluid inlet, the first hot fluid outlet, the second hot fluid inlet, the second hot fluid outlet, the feed port of the filter press and the filtrate discharge port of the filter press are sequentially communicated, the filtrate discharge port of the filter press is respectively communicated with the first cold fluid inlet and the second cold fluid inlet, and the first cold fluid outlet and the second cold fluid outlet are respectively communicated with the acid separation device.
2. The production system of 2-hydroxy-3-naphthoic acid as claimed in claim 1, wherein the neutralization and filter-pressing production apparatus further comprises a first communicating pipe, a second communicating pipe and a third communicating pipe, both ends of the first communicating pipe are respectively communicated with the discharge port of the neutralization kettle and the first hot fluid inlet, both ends of the third communicating pipe are respectively communicated with the first hot fluid outlet and the second hot fluid inlet, and the second communicating pipe is respectively communicated with the first communicating pipe and the third communicating pipe.
3. The system for producing 2-hydroxy-3-naphthoic acid according to claim 2, wherein a circulation pump is connected in series to the first communicating tube, the circulation pump being disposed before a connection point of the first communicating tube and the second communicating tube; the neutralization and filter-pressing production device further comprises a first steam purging device, and the first steam purging device is communicated with the first communication pipe.
4. The production system of 2-hydroxy-3-naphthoic acid according to claim 2, wherein the neutralization and filter-pressing production apparatus further comprises a fourth communicating tube, a fifth communicating tube, and a sixth communicating tube, wherein both ends of the fourth communicating tube are respectively communicated with the upper portion of the neutralization kettle and the third communicating tube, both ends of the sixth communicating tube are respectively communicated with the second thermal fluid outlet and the feed inlet of the filter press, and both ends of the fifth communicating tube are respectively communicated with the fourth communicating tube and the sixth communicating tube.
5. The production system of 2-hydroxy-3-naphthoic acid as claimed in claim 1, wherein said neutralization and filter-pressing production apparatus further comprises a filtrate ground tank and a seventh communicating tube, said filtrate ground tank comprises a filtrate buffer tank and a filtrate output tank which are sequentially communicated, said filtrate buffer tank is communicated with a filtrate discharge port of said filter press, said filtrate output tank is respectively communicated with said first cold fluid inlet and said second cold fluid inlet through said seventh communicating tube.
6. The production system of 2-hydroxy-3-naphthoic acid as claimed in claim 1, wherein said carbonizing device comprises a carbonizing kettle, a 2-naphthol collecting tank, a waste water catcher and a vacuum pumping system which are connected in sequence; wherein the carbonization kettle comprises a kettle body, a stirring device which is arranged on the kettle body and is used for stirring internal materials, a heating device which is arranged on the outer wall of the kettle body and is used for heating the internal materials, and a carbon dioxide gas distribution mechanism which is arranged inside the kettle body, the carbonization kettle also comprises a discharge hole arranged at the bottom of the kettle body, and a 2-sodium naphthol salt feeding pipe and a carbon dioxide gas inlet pipe which are respectively arranged at the top of the kettle body, the 2-naphthol sodium salt feeding pipe is communicated with the 2-naphthol salifying reaction kettle, the discharge hole of the carbonization kettle is communicated with the neutralization and filter-pressing production device, the carbon dioxide gas distribution mechanism comprises a gas guide tube communicated with the carbon dioxide gas inlet tube and an annular gas distribution tube communicated with the gas guide tube and positioned below the stirring device, and a plurality of through holes are formed in the annular gas distribution tube.
7. The system for producing 2-hydroxy-3-naphthoic acid as claimed in claim 6, wherein said plurality of through holes constitute at least two sets of through hole arrays, each set of through hole arrays includes n through holes equally spaced on said circular air distribution pipe, n is 4 or more, and said n through holes are circled.
8. The system for producing 2-hydroxy-3-naphthoic acid as claimed in claim 7, wherein in said at least two sets of through-hole arrays, every two through-hole arrays are parallel to each other.
9. The system for producing 2-hydroxy-3-naphthoic acid as claimed in claim 6, wherein said stirring device comprises a driving member mounted on said tank body, a rotating shaft in transmission connection with said driving member, and a stirring paddle fixedly disposed at a lower portion of said rotating shaft, said stirring paddle comprising a first stirring portion and a second stirring portion sequentially disposed on said rotating shaft along a vertical direction, said first stirring portion being a first stirring shaft extending along a horizontal direction, said second stirring portion comprising a stirring base fixedly disposed at a lower end portion of said rotating shaft, and a plurality of second stirring shafts disposed on said stirring base and forming a surrounding frame structure with said stirring base.
10. The production system of 2-hydroxy-3-naphthoic acid as claimed in claim 6, wherein the heating device comprises a casing covering the kettle body and forming a heat transfer oil flow channel with the kettle body, the casing being provided with at least two heat transfer oil inlets and at least one heat transfer oil outlet; the lower part of the kettle body is respectively provided with a temperature detection port and a pressure detection port.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115155493A (en) * | 2022-07-05 | 2022-10-11 | 山西金兰化工股份有限公司 | Continuous magnesium nitrate neutralizing device and preparation process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115155493A (en) * | 2022-07-05 | 2022-10-11 | 山西金兰化工股份有限公司 | Continuous magnesium nitrate neutralizing device and preparation process |
| CN115155493B (en) * | 2022-07-05 | 2024-07-26 | 山西金兰化工股份有限公司 | Magnesium nitrate continuous neutralization device and preparation process |
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