CN212467149U - Be used for high vacuum secondary continuous high-efficient dewatering system of sulfonic acid mother liquor - Google Patents
Be used for high vacuum secondary continuous high-efficient dewatering system of sulfonic acid mother liquor Download PDFInfo
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- CN212467149U CN212467149U CN202020549324.1U CN202020549324U CN212467149U CN 212467149 U CN212467149 U CN 212467149U CN 202020549324 U CN202020549324 U CN 202020549324U CN 212467149 U CN212467149 U CN 212467149U
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Abstract
A high-vacuum secondary continuous efficient dehydration system for sulfonic acid mother liquor belongs to the technical field of chemical dehydration and comprises a mother liquor feeding pump, a preheater and a thin-film evaporator which are sequentially connected through pipelines, wherein the thin-film evaporator comprises a steam outlet at the upper part and a mother liquor outlet at the bottom part, the steam outlet is connected with a condenser, the upper part of the condenser is connected with a vacuum unit, the lower end of the condenser is connected with a toluene separator, an overflow port at the upper part of the toluene separator is connected with a toluene tank, and an outlet at the lower part of the toluene separator is connected with; the mother liquor outlet is connected with a dehydration kettle, the outlet at the upper part of the dehydration kettle is connected with the inlet end of a condenser, and the outlet at the lower part of the dehydration kettle is connected with a dehydration mother liquor tank. Simple structure, the running cost is low, adopts film evaporator's high-efficient evaporation, and mother liquor dwell time is short, and evaporation effect is good, and the side reaction that significantly reduces effectively reduces p-cresol toluene unit consumption, and is high to the sulfonic acid mother liquor dehydration rate, realizes the mother liquor zero release, does not have secondary pollution, and the continuity feeding, the handling capacity is bigger.
Description
Technical Field
The utility model belongs to the technical field of the chemical industry dehydration, specifically speaking is a be used for the continuous high-efficient dewatering system of sulfonic acid mother liquor high vacuum secondary.
Background
The p-methylphenol is produced by using toluene as a raw material and sulfuric acid as a sulfonating agent to prepare benzenesulfonic acid through sulfonation reaction, and then performing the procedures of neutralization, drying, alkali fusion, acidification, dehydration, continuous refining, crystallization, rectification and the like to prepare the p-methylphenol. During the production of benzenesulfonic acid, a portion of sulfonic acid mother liquor is produced, whose main components are benzenesulfonic acid, sulfuric acid and water. The prior sulfonic acid mother liquor treatment process comprises the steps of conveying the sulfonic acid mother liquor into a dehydration kettle, dehydrating at the temperature of 125-145 ℃ and under the negative pressure of-80 kpa, then using a part of the sulfonic acid mother liquor to generate absorption acid in a sulfonic acid absorption tower, and using a part of the sulfonic acid mother liquor and the absorption acid to prepare acid for sulfonation. Because of the limitation of the existing dehydration kettle process, the moisture in the dehydrated mother liquor is still about 7%, and the existence of the moisture causes the mother liquor to expand in the process of system circulation and must be discharged. At present, the discharged sulfonic acid mother liquor needs to be transported to qualified factories for treatment, but the mode has the possibility of causing secondary pollution in the treatment and transportation processes and has high treatment cost.
SUMMERY OF THE UTILITY MODEL
For solving now in benzenesulfonic acid production, because the limitation of dehydration cauldron technology, moisture in the sulfonic acid mother liquor after the dehydration still is about 7%, can make the mother liquor cause the inflation at systemic circulation's in-process, must arrange outward, need transport to other producers and handle, probably bring secondary pollution, and the problem that treatment cost is high, the utility model provides a be used for the high vacuum secondary of sulfonic acid mother liquor high efficiency dewatering system in succession.
The utility model discloses a realize through following technical scheme.
A high-vacuum secondary continuous efficient dehydration system for sulfonic acid mother liquor comprises a mother liquor feeding pump, a preheater and a thin-film evaporator which are sequentially connected through pipelines, wherein the thin-film evaporator comprises a steam outlet at the upper part and a mother liquor outlet at the bottom part, the steam outlet is connected with a condenser through a pipeline, the upper part of the condenser is connected with a vacuum unit through a pipeline, the lower end of the condenser is connected with a toluene separator through a pipeline, an overflow port at the upper part of the toluene separator is connected with a toluene tank through a pipeline, and an outlet at the lower part of the toluene separator is connected with a sewage tank through a; the mother liquor outlet is connected with a dehydration kettle through a pipeline, the outlet at the upper part of the dehydration kettle is connected with the inlet end of a condenser through a pipeline, and the outlet at the lower part of the dehydration kettle is connected with a dehydration mother liquor tank through a pipeline.
The utility model discloses a further improvement still, above-mentioned film evaporator includes that the outer wall area presss from both sides the casing that overlaps, the casing top is equipped with the motor reducer who erects, motor reducer's output shaft transmission is connected with the bull stick of erectting, the bull stick is connected with the scraper blade of hugging closely shells inner wall through the bracing piece, and the bull stick bottom is rotated through supporting the rotating stand and being connected with the casing, casing upper portion is equipped with the mother liquor import tangent with shells inner wall.
The utility model discloses a further improvement still, above-mentioned pre-heater is two parallelly connected settings, the condenser is the graphite material, and sets up for two series connections.
The utility model is further improved in that the mother liquor feeding pump is connected with a frequency converter and is made of fluoroplastic materials; the thin film evaporator and the dehydration kettle are both made of enamel materials, the vacuum unit is lined with tetrafluoro materials, and the toluene separator is made of stainless steel materials; the outer surface of the dehydration kettle is provided with a heating jacket, the inner part of the dehydration kettle is provided with a stirring device, and the two end surfaces of the stirring device are labyrinth mechanical seals.
The utility model discloses a further improvement still, above-mentioned film evaporator and dehydration cauldron are equipped with the circulating pump within a definite time.
The utility model discloses a further improvement still is equipped with the mother liquor condenser of dehydration between above-mentioned dehydration cauldron and dehydration mother liquor jar.
The utility model discloses a further improvement still, above-mentioned mother liquor feed pump, pre-heater, film evaporator, condenser, vacuum unit, dehydration cauldron, dehydration mother liquor jar, toluene separator, sewage jar and toluene jar and pipeline all fill up flange joint through adding soft tetrafluoro.
According to the technical scheme provided by the utility model, the beneficial effects are that: 1. the efficient and rapid evaporation and separation of the film evaporator are adopted, so that the residence time of the sulfonic acid mother liquor in the film evaporator is short, the evaporation and dehydration effects are good, the side reactions are greatly reduced, and the unit consumption of p-cresol and toluene is effectively reduced; 2. the dehydration rate of the sulfonic acid mother liquor is high, zero discharge of the mother liquor is realized, and no secondary pollution is caused; 3. the continuous feeding is adopted, and the treatment capacity is larger; 4. the structure is simple, the manufacturing cost is low, the operation cost is low, each device is stable and safe to operate, and the service life is long.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a thin film evaporator according to an embodiment of the present invention.
In the drawings: 1. mother liquor feeding pump, 2, preheater, 3, film evaporator, 31, motor reducer, 32, shell, 33, mother liquor inlet, 34, rotating rod, 35, steam outlet, 36, mother liquor outlet, 37, supporting rod, 38, scraper, 39, supporting rotating frame, 4, condenser, 5, vacuum unit, 6, circulating pump, 7, dehydration kettle, 8, dehydration mother liquor condenser, 9, dehydration mother liquor tank, 10, toluene separator, 11, sewage tank, 12 and toluene tank.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments, and obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.
As shown in the attached drawings, the high-vacuum secondary continuous high-efficiency dewatering system for sulfonic acid mother liquor comprises a mother liquor feeding pump 1, a preheater 2 and a thin-film evaporator 3 which are sequentially connected through pipelines, wherein the thin-film evaporator 3 comprises an upper steam outlet 35 and a bottom mother liquor outlet 36, the steam outlet 35 is connected with a condenser 4 through a pipeline, the upper part of the condenser 4 is connected with a vacuum unit 5 through a pipeline, the lower end of the condenser 4 is connected with a toluene separator 10 through a pipeline, an upper overflow port of the toluene separator 10 is connected with a toluene tank 12 through a pipeline, and a lower outlet of the toluene separator 10 is connected with a sewage tank 11 through a pipeline; the mother liquor outlet 36 is connected with a dehydration kettle 7 through a pipeline, the outlet at the upper part of the dehydration kettle 7 is connected with the inlet end of the condenser 4 through a pipeline, and the outlet at the lower part of the dehydration kettle 7 is connected with a dehydration mother liquor tank 9 through a pipeline. The sulfonic acid mother liquor is powered by a mother liquor feeding pump 1, preheated by steam in a preheater 2, rapidly evaporated and reacted by a thin film evaporator 3, the steam generated in the thin film evaporator 3 is condensed in a condenser 4 through a steam outlet 35, the toluene non-condensable gas is extracted by a vacuum unit 5, and the condensed toluene and water mixture is subjected to overflow separation through a toluene separator 10; the concentrated mother liquor evaporated in the film evaporator 3 goes to the dehydration kettle 7 through a mother liquor outlet 36 for dehydration reaction again, the generated steam is connected to the condenser 4 for condensation, and the dehydrated mother liquor enters a dehydrated mother liquor tank 9 for storage. The continuous and efficient dehydration of the sulfonic acid mother liquor is completed, the dehydration rate is high, the zero discharge of the mother liquor is realized, the continuous feeding is realized through the mother liquor feeding pump 1, the treatment capacity is larger, the efficient and rapid evaporation and separation of the film evaporator 3 are adopted, the residence time of the mother liquor in the film evaporator 3 is short, the evaporation and dehydration effect is good, the side reaction is greatly reduced, and the unit consumption of the p-cresol and toluene is effectively reduced.
Further, the thin film evaporator 3 comprises a shell 32 with a jacket on the outer wall, a vertical motor reducer 31 is arranged on the top of the shell 32, an output shaft of the motor reducer 31 is connected with a vertical rotating rod 34 in a transmission manner, the rotating rod 34 is connected with a scraper 38 tightly attached to the inner wall of the shell 32 through a support rod 37, the bottom of the rotating rod 34 is rotatably connected with the shell 32 through a support rotating frame 39, and a mother liquid inlet 33 tangent to the inner wall of the shell 32 is arranged on the upper portion of the shell 32. High-temperature steam is introduced into a jacket on the outer wall of the shell 32, the rotating rod 34 is driven to rotate through the motor speed reducer 31, the rotating rod 24 drives the scraper 38 to rotate through the supporting rod 37, mother liquor entering the upper mother liquor inlet 33 is scraped along the rotation of the inner wall of the shell 32 through the scraper 38, a liquid film flowing in a rotating mode is formed on the inner wall of the shell 32, the mother liquor liquid film is subjected to rapid high-temperature evaporation reaction through the steam, the steam flows to the upper steam outlet 35, concentrated mother liquor flows out from the bottom mother liquor outlet 36, the residence time of the mother liquor in the shell 32 is short, the evaporation and dehydration effects are good, the side reactions are greatly reduced, and the unit consumption.
Further, the preheater 2 is two and connects the setting in parallel, the condenser 4 is the graphite material, and is two series arrangements. The parallel pre-heaters 2 can quickly pre-heat the sulfonic acid mother liquor, so that the subsequent evaporation reaction of the film evaporator 3 is faster, the evaporation effect is better, and the dehydration rate in the film evaporator 3 is effectively improved; the condensers 4 arranged in series enable condensation and temperature reduction to be faster, and the efficiency of subsequent toluene separation is guaranteed.
Further, a frequency converter is connected to the mother liquid feeding pump 1, and the mother liquid feeding pump 1 is made of a fluoroplastic material; the thin film evaporator 3 and the dehydration kettle 7 are both made of enamel materials, the vacuum unit 5 is made of a tetrafluoro lining material, and the toluene separator 10 is made of stainless steel materials; the outer surface of the dehydration kettle 7 is provided with a heating jacket, the inside of the dehydration kettle is provided with a stirring device, and the two end surfaces of the stirring device are labyrinth mechanical seals. To entire system, each device operation is stable, and long service life can not take place the reaction with the material, and dehydration cauldron 7 simple structure, the dehydration rate is high, and the leakproofness is good.
Further, a circulating pump 6 is arranged between the thin film evaporator 3 and the dehydration kettle 7. The circulating pump 6 provides transportation power for the concentrated mother liquor after the evaporation reaction of the film evaporator 3, and ensures higher reaction efficiency.
Further, a dehydration mother liquor condenser 8 is arranged between the dehydration kettle 7 and the dehydration mother liquor tank 9. The dehydrated mother liquor condenser 8 condenses the dehydrated mother liquor and then feeds the condensed mother liquor into the dehydrated mother liquor tank 9, so that the self-stability and good storability of the mother liquor are effectively guaranteed.
Further, the mother liquor feeding pump 1, the preheater 2, the thin film evaporator 3, the condenser 4, the vacuum unit 5, the dehydration kettle 7, the dehydration mother liquor tank 9, the toluene separator 10, the sewage tank 11, the toluene tank 12 and the pipeline are all connected through flanges with a soft tetrafluoro cushion. The connection strength between each device and the pipeline is good, the device has certain flexibility, the influence and the damage of installation stress on the device are avoided, and the safety is good.
When the system is used, firstly, the sulfonic acid mother liquor continuously provides transportation power through a variable-frequency mother liquor feeding pump 1, steam in two parallel preheaters 2 is quickly preheated and enters a film evaporator 3 to form a liquid film, the liquid film is quickly evaporated and reacts through high-temperature steam heating in a jacket, the steam generated in the film evaporator 3 is condensed in two condensers 4 connected in series through a steam outlet 35, the toluene noncondensable gas is extracted through a vacuum unit 5, the condensed toluene and water mixture is subjected to overflow separation through a toluene separator 10, the toluene flowing out of an upper overflow port is introduced into a toluene tank 12, and the water flowing out of a lower outlet is introduced into a sewage tank 11; and (3) pressurizing and pumping the concentrated mother liquor evaporated in the film evaporator 3 to a dehydration kettle 7 through a mother liquor outlet 36 by a circulating pump 6 for dehydration reaction again, introducing the generated steam into an inlet end of a condenser 4 for mixing and condensation, and introducing the dehydrated mother liquor into a dehydrated mother liquor tank 9 for storage after the dehydrated mother liquor is condensed by a dehydrated mother liquor condenser 8 to finish continuous and efficient dehydration of the sulfonic acid mother liquor.
The high-vacuum secondary continuous efficient dehydration system for the sulfonic acid mother liquor has the advantages of simple structure, low manufacturing cost, low operation cost, stable and safe operation of each device, long service life, adoption of efficient and rapid evaporation and separation of the thin film evaporator, short residence time of the sulfonic acid mother liquor in the thin film evaporator, good evaporation and dehydration effects, great reduction of side reactions, effective reduction of unit consumption of p-cresol and toluene, high dehydration rate of the sulfonic acid mother liquor, realization of zero discharge of the mother liquor, no secondary pollution, continuous feeding and larger treatment capacity.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The terms "upper", "lower", "outside", "inside" and the like in the description and claims of the present invention and the above drawings are used for distinguishing relative relationships in positions, if any, and are not necessarily given qualitatively. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The high-vacuum secondary continuous efficient dehydration system for sulfonic acid mother liquor is characterized by comprising a mother liquor feeding pump (1), a preheater (2) and a thin-film evaporator (3) which are sequentially connected through pipelines, wherein the thin-film evaporator (3) comprises a steam outlet (35) at the upper part and a mother liquor outlet (36) at the bottom part, the steam outlet (35) is connected with a condenser (4) through a pipeline, the upper part of the condenser (4) is connected with a vacuum unit (5) through a pipeline, the lower end of the condenser (4) is connected with a toluene separator (10) through a pipeline, an upper overflow port of the toluene separator (10) is connected with a toluene tank (12) through a pipeline, and a lower outlet of the toluene separator (10) is connected with a sewage tank (11) through a; the mother liquor outlet (36) is connected with a dehydration kettle (7) through a pipeline, the outlet at the upper part of the dehydration kettle (7) is connected with the inlet end of the condenser (4) through a pipeline, and the outlet at the lower part of the dehydration kettle (7) is connected with a dehydration mother liquor tank (9) through a pipeline.
2. The high-vacuum secondary continuous efficient dewatering system for sulfonic acid mother liquor according to claim 1, wherein the thin film evaporator (3) comprises a shell (32) with a jacket on the outer wall, a vertical motor reducer (31) is arranged on the top of the shell (32), an output shaft of the motor reducer (31) is in transmission connection with a vertical rotating rod (34), the rotating rod (34) is connected with a scraper (38) clinging to the inner wall of the shell (32) through a support rod (37), the bottom of the rotating rod (34) is in rotary connection with the shell (32) through a support rotating frame (39), and a mother liquor inlet (33) tangential to the inner wall of the shell (32) is arranged on the upper portion of the shell (32).
3. The high-vacuum secondary continuous efficient dewatering system for sulfonic acid mother liquor according to claim 1, wherein the two preheaters (2) are arranged in parallel, and the condenser (4) is made of graphite and is arranged in series.
4. The high-vacuum secondary continuous high-efficiency dewatering system for sulfonic acid mother liquor according to claim 1, characterized in that a frequency converter is connected to the mother liquor feed pump (1), and the mother liquor feed pump (1) is made of fluoroplastic material; the thin film evaporator (3) and the dehydration kettle (7) are both made of enamel materials, the vacuum unit (5) is lined with a tetrafluoro material, and the toluene separator (10) is made of stainless steel materials; the outer surface of the dehydration kettle (7) is provided with a heating jacket, the inside of the dehydration kettle is provided with a stirring device, and the two end surfaces of the stirring device are labyrinth mechanical seals.
5. The high-vacuum secondary continuous high-efficiency dewatering system for sulfonic acid mother liquor according to claim 1, characterized in that a circulating pump (6) is arranged between the thin film evaporator (3) and the dewatering kettle (7).
6. The high-vacuum secondary continuous high-efficiency dewatering system for sulfonic acid mother liquor according to claim 1, characterized in that a dewatering mother liquor condenser (8) is arranged between the dewatering kettle (7) and the dewatering mother liquor tank (9).
7. The high-vacuum secondary continuous high-efficiency dewatering system for sulfonic acid mother liquor according to claim 1, wherein the mother liquor feed pump (1), the preheater (2), the thin film evaporator (3), the condenser (4), the vacuum unit (5), the dewatering kettle (7), the dewatering mother liquor tank (9), the toluene separator (10), the sewage tank (11) and the toluene tank (12) are all connected with pipelines through flanges of softened tetrafluoro pads.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113941167A (en) * | 2021-11-02 | 2022-01-18 | 合盛硅业股份有限公司 | Production equipment and production method of simethicone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113941167A (en) * | 2021-11-02 | 2022-01-18 | 合盛硅业股份有限公司 | Production equipment and production method of simethicone |
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