Neutralization device for neutralizing sodium sulfonate solution by using solid caustic soda flakes

Abstract

The utility model belongs to the technical field of neutralization through solid caustic soda flakes and a sodium sulfonate solution in p-cresol phenol production, and particularly relates to a neutralization device for neutralizing the sodium sulfonate solution through the solid caustic soda flakes. Comprising an aging kettle, a caustic soda flake auger and a caustic soda flake bin, the aging kettle is communicated with a caustic soda melting tank through a liquid inlet pipeline and a regulating valve, an online pH detector, an online liquid level meter, a stirrer and an extraction pump are installed on the caustic soda melting tank, a paddle and a connecting rod are installed on a shaft of the stirrer, a bottom scraper and a side scraper are welded to the connecting rod, and a pulley is in bolted connection with the top end of the side scraper. The device effectively solves the problems that the caustic soda flakes are difficult to dissolve in a high-concentration salt-containing solution neutralized by the caustic soda flakes, salt deposition is caused and the like, improves the concentration of neutralized sodium sulfonate, reduces consumption of neutralized sulfur dioxide, caustic soda flakes and steam, and improves the production efficiency. The device has the advantages of high automation degree and low operation cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of neutralization of solid caustic soda flakes and sodium sulfonate solution in the production of p-cresol phenol, and particularly relates to a neutralization device for neutralizing the sodium sulfonate solution with solid caustic soda flakes. Background Art

[0002] In the production process of p-cresol phenol, toluene and sulfuric acid are used as raw materials to produce p-toluenesulfonic acid through sulfonation reaction; p-toluenesulfonic acid and sodium sulfite produced by alkali fusion undergo acid-base neutralization reaction to generate sodium p-toluenesulfonate solution, which then enters a drum dryer to dry the liquid sodium sulfonate into solid sodium sulfonate, and the water vapor is condensed; the solid sodium sulfonate reacts with caustic soda flakes in an alkali fusion kettle to generate sodium p-cresol phenolate and sodium sulfite; sodium p-cresol phenolate undergoes an acidification reaction with sulfur dioxide produced by neutralization to obtain crude phenol, which is then dehydrated, refined, crystallized, distilled and other processes to obtain p-cresol phenol.

[0003] In order to ensure that the sodium sulfite in the neutralization kettle is completely reacted and the sulfur dioxide produced is discharged in time, the neutralization kettle often adopts an acid excess reaction mode. The acidic sodium sulfonate solution produced by the neutralization kettle first enters the aging kettle, and under the action of high vacuum, the sulfur dioxide in the sodium sulfonate solution is precipitated, and then it is neutralized with caustic soda flakes and enters the sodium sulfonate drying process. Because the total salt content in the sodium sulfonate solution from the aging kettle is about 40-60%, when caustic soda flakes are used for neutralization, a large amount of sodium sulfate salt is produced during the neutralization process due to the low solubility, causing the alkali tank and pipeline to be blocked. At present, low-concentration liquid caustic soda is mainly used to neutralize this part of the sodium sulfonate solution, and the concentration of liquid caustic soda is 5-20%. If the concentration of liquid caustic soda is high, some liquid caustic soda will not react in time when added to the sodium sulfonate solution, and finally precipitate in the form of sodium sulfate salt, resulting in waste of caustic soda flakes. In view of the problems that it is difficult for caustic soda flakes to dissolve high-concentration salt-containing solutions and salt formation, it is necessary to provide a neutralization device for solid caustic soda flakes to neutralize sodium sulfonate solutions to solve the above problems. Summary of the invention

[0004] The utility model aims to provide a neutralization device for neutralizing a sodium sulfonate solution with solid caustic soda flakes, so as to solve the problems existing in the prior art.

[0005] The utility model adopts the following technical scheme to solve the technical problems: a neutralization device for solid caustic soda flakes and sodium sulfonate solution, comprising an aging kettle, a caustic soda flake auger and a caustic soda flake silo, the aging kettle is connected with a caustic soda tank through a liquid inlet pipeline and a regulating valve, an online pH detector, an online liquid level gauge, a stirrer and a production pump are installed on the caustic soda tank, a blade and a connecting rod are installed on the shaft of the stirrer, a bottom scraper and a side scraper are welded on the connecting rod, a pulley is bolted to the top of the side scraper, a slide groove is welded on the upper part of the inner wall of the caustic soda tank, the pulley is slidably connected in the slide groove, the discharge end of the caustic soda flake silo is directly impacted by the feed end of the caustic soda flake auger, the discharge end of the caustic soda flake auger is connected with the caustic soda tank through a plug valve and an alkali inlet pipeline, and the online pH detector, the online liquid level gauge, the stirrer, the production pump, the caustic soda flake auger, the plug valve, the caustic soda flake silo and a power distribution control box are electrically connected.

[0006] Furthermore, there are multiple paddles, which are installed in the middle position of the shaft end of the agitator, there are two connecting rods, which are symmetrically installed at the bottom position of the shaft end of the agitator, there are two bottom scrapers, which are respectively welded to the bottom of the two connecting rods, and there are two side scrapers, which are respectively welded to one end of the connecting rod close to the inner wall of the alkali tank.

[0007] Furthermore, a notch is provided at the top of the side scraper, a mounting plate is welded at the top of the side scraper, the pulley is bolted to the mounting plate, and the pulley is bolted to the side scraper through the mounting plate.

[0008] Furthermore, the alkali-chemical tank is a circular tank body, the cross section of the slide is L-shaped, the slide as a whole matches the shape of the inner wall of the alkali-chemical tank to form a ring, and the slide passes through the gap of the side scraper.

[0009] Furthermore, the production pump is a submersible pump, and the feed end of the production pump is located at the bottom of the alkali tank and does not contact the side scraper, bottom scraper, and paddle.

[0010] Furthermore, an online weighing device is installed on the caustic soda ash silo, and a feeding valve is installed at the discharge end of the caustic soda ash silo. The caustic soda ash silo is electrically connected to the power distribution control box through the online weighing device and the feeding valve.

[0011] Furthermore, the measuring end of the online pH detector is located at the bottom of the alkali tank and does not contact the side scraper, bottom scraper, and paddle. The online pH detector is interlocked with the gate valve, caustic soda auger, and feeding valve.

[0012] Furthermore, the power distribution control box is electrically connected to an audible and visual prompter, and the audible and visual prompter is interlocked with an online weighing device.

[0013] Furthermore, the online liquid level meter is a non-contact liquid level meter, and the online liquid level meter is interlocked with the production pump.

[0014] Furthermore, the output end of the alkali inlet pipeline is located below the highest liquid level of the alkali-making tank.

[0015] The utility model has the following beneficial effects:

[0016] 1. The utility model effectively solves the problems of difficulty in dissolving and salting in neutralizing high-concentration saline solutions with flake caustic soda, increases the concentration of neutralized sodium sulfonate, reduces the consumption of neutralized sulfur dioxide, flake caustic soda and steam, and has the advantages of high degree of automation and low operating cost.

[0017] 2. Supporting the side scraper by pulleys and slideways can ensure that the side scraper will not be deformed or damaged, and will not hinder the installation of the production pump and online pH detector.

[0018] 3. The production pump is designed as a submersible pump, which will continuously crush the generated sodium sulfate during operation to avoid clogging.

[0019] 4. A composite stirring is formed by arranging a bottom scraper, a side scraper and a paddle on the agitator. The bottom scraper and the side scraper scrape the sodium sulfate on the inner wall of the alkali tank, and the paddle crushes the caustic soda flakes and sodium sulfate and stirs the sodium sulfonate solution, so as to facilitate the dissolution of caustic soda flakes and sodium sulfate in the sodium sulfonate solution, thereby solving the problems of caustic soda flakes being difficult to dissolve in high-concentration salt solutions and blockage caused by salt formation.

[0020] 5. Through the interlocking of the online pH detector with the plug valve, caustic soda auger and feeding valve, the online liquid level meter is a non-contact liquid level meter. The online liquid level meter is interlocked with the production pump to achieve continuous neutralization, thereby improving the degree of automation, preventing excessive caustic soda, and reducing consumption.

[0021] 6. The temperature of the sodium sulfonate solution is relatively high. During the stirring process, the sodium sulfonate solution and hot air will continuously impact the caustic soda flakes in the alkali inlet pipeline to fluidize it, thereby preventing the caustic soda flakes from agglomerating and clogging in the alkali inlet pipeline.

[0022] 7. Through the interlocking of the sound and light prompter with the online weighing device, the staff can be reminded to replenish materials in time to prevent the neutralization indicators from being unqualified due to the depletion of flake caustic soda. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the utility model.

[0024] Figure 2 This utility model Figure 1 Enlarged structural diagram at A in the middle.

[0025] Figure 3 It is a schematic diagram of the installation side structure of the pulley of the utility model.

[0026] Among them: 1. Aging kettle; 2. Caustic soda ash auger; 3. Liquid inlet pipeline; 4. Regulating valve; 5. Caustic soda ash tank; 6. Online pH detector; 7. Online liquid level meter; 8. Agitator; 9. Production pump; 10. Paddle; 11. Connecting rod; 12. Bottom scraper; 13. Side scraper; 14. Mounting plate; 15. Pulley; 16. Chute; 17. Caustic soda ash silo; 18. Gate valve; 19. Caustic soda inlet pipeline; 20. Maximum liquid level; 21. Online weighing device; 22. Feeding valve. DETAILED DESCRIPTION

[0027] The utility model will now be described in further detail with reference to the accompanying drawings.

[0028] like Figure 1-3 As shown, a neutralization device for neutralizing sodium sulfonate solution with solid caustic soda flakes comprises an aging kettle 1, a caustic soda flake auger 2, and a caustic soda flake silo 17. The aging kettle 1 is connected to a caustic soda tank 5 through a liquid inlet pipe 3 and a regulating valve 4. The caustic soda tank 5 is equipped with an online pH detector 6, an online liquid level meter 7, a stirrer 8, and a production pump 9. The shaft of the stirrer 8 is equipped with a paddle 10 and a connecting rod 11. The connecting rod 11 is welded with a bottom scraper 12 and a side scraper 13. The top of the side scraper 13 is connected to the bottom scraper 12. A pulley 15 is bolted to the end, a slide groove 16 is welded on the upper part of the inner wall of the caustic soda tank 5, the pulley 15 is slidably connected in the slide groove 16, the discharge end of the caustic soda silo 17 is directly impacting the feed end of the caustic soda auger 2, the discharge end of the caustic soda auger 2 is connected to the caustic soda ash tank 5 through the gate valve 18 and the caustic soda inlet pipeline 19, the online pH detector 6, the online liquid level meter 7, the agitator 8, the production pump 9, the caustic soda ash auger 2, the gate valve 18, the caustic soda ash silo 17 are electrically connected to the power distribution control box.

[0029] There are multiple paddle blades 10, which are installed at the middle position of the shaft end of the agitator 8. There are two connecting rods 11, which are symmetrically installed at the bottom position of the shaft end of the agitator 8. There are two bottom scrapers 12, which are respectively welded to the bottom of the two connecting rods 11. There are two side scrapers 13, which are respectively welded to one end of the connecting rod 11 close to the inner wall of the alkali tank 5.

[0030] When the paddle 10 rotates, the sodium sulfonate solution is stirred on the one hand, and the added caustic soda flakes are sheared and crushed on the other hand. The bottom scraper 12 is used to scrape the sodium sulfate at the bottom of the caustic soda tank 5 and stir it to float, and the side scraper 13 is used to scrape the sodium sulfate on the side wall of the caustic soda tank 5, so that it is crushed by the paddle 10 and dissolved in the sodium sulfonate solution.

[0031] A notch is provided on the top of the side scraper 13 , a mounting plate 14 is welded on the top of the side scraper 13 , a pulley 15 is bolted to the mounting plate 14 , and the pulley 15 is bolted to the side scraper 13 through the mounting plate 14 .

[0032] The alkali-removing tank 5 is a circular tank body, and the cross section of the chute 16 is L-shaped. The chute 16 as a whole matches the shape of the inner wall of the alkali-removing tank 5 to form a ring shape, and the chute 16 passes through the gap of the side scraper 13.

[0033] The bottom end of the side scraper 13 is connected to the stirring shaft of the stirrer 8 through the connecting rod 11, and there is no corresponding connection support structure at the top of the side scraper 13, which will cause the side scraper 13 to be deformed and damaged during use, and even damage the alkali-removing tank 5. This is because if the stirring shaft is also connected to the top of the side scraper 13 through the connecting rod 11, then the extraction pump 9 and the online pH detector 6 cannot be installed, so it is necessary to maintain installation space on the upper part of the alkali-removing tank 5. Supporting the side scraper 13 by the pulley 15 and the slide 16 can ensure that the side scraper 13 will not be deformed or damaged, and will not hinder the installation of the extraction pump 9 and the online pH detector 6.

[0034] The extraction pump 9 is a submersible pump, and the feed end of the extraction pump 9 is located at the bottom of the alkali tank 5 and does not contact the side scraper 13, the bottom scraper 12, and the blade 10. The extraction pump 9 is designed as a submersible pump because sodium sulfate will be adsorbed on the side wall. If the liquid outlet pipe is installed from the side, the pipe mouth will be blocked. The submersible pump is located inside the sodium sulfonate solution, and it will continuously crush the generated sodium sulfate during operation, so it will not be blocked.

[0035] An online weighing device 21 is installed on the caustic soda ash silo 17 , and a feeding valve 22 is installed at the discharge end of the caustic soda ash silo 17 . The caustic soda ash silo 17 is electrically connected to the power distribution control box through the online weighing device 21 and the feeding valve 22 .

[0036] The measuring end of the online pH detector 6 is located at the bottom of the alkali tank 5 and does not contact the side scraper 13, the bottom scraper 12, and the paddle 10. The online pH detector 6 is interlocked with the gate valve 18, the caustic soda auger 2, and the feeding valve 22.

[0037] The power distribution control box is electrically connected with an audible and visual prompter, and the audible and visual prompter is interlocked with the online weighing device 21 .

[0038] The online liquid level meter 7 is a non-contact liquid level meter, and the online liquid level meter 7 is interlocked with the production pump 9.

[0039] The output end of the alkali inlet pipeline 19 is located below the highest liquid level 20 of the alkali tank 5. The temperature of the sodium sulfonate solution is relatively high, and the sodium sulfonate solution and hot air will continuously impact the caustic soda flakes in the alkali inlet pipeline 19 to fluidize them during the stirring process, thereby preventing the caustic soda flakes from agglomerating and clogging in the alkali inlet pipeline 19.

[0040] The working principle of the utility model is:

[0041] The upper and lower limits of the pH value, the upper and lower limits of the liquid level, and the lower limit of the online weighing device 21 are set on the power distribution control box, and the flake caustic soda is loaded into the flake caustic soda silo 17.

[0042] Open the regulating valve 4, and the acidic sodium sulfonate solution from the aging kettle 1 enters the alkali-forming tank 5 through the regulating valve 4. The sodium sulfonate solution contains a large amount of unreacted sulfuric acid, p-toluenesulfonic acid, sulfur dioxide and other substances. When the acidic sodium sulfonate solution enters the alkali-forming tank 5, the online pH detector 6 is used for detection. If the pH is lower than the set lower limit, the feeding valve 22, the caustic soda auger 2, and the gate valve 18 are opened to allow the caustic soda ash to enter the alkali-forming tank 5.

[0043] The stirrer 8 is turned on. The bottom scraper 12, the side scraper 13 and the paddle 10 on the stirrer 8 form a composite stirring. The paddle 10 breaks the caustic soda flakes to facilitate the dissolution of the caustic soda flakes in the sodium sulfonate solution. The solid caustic soda flakes react with the sulfuric acid, p-toluenesulfonic acid and sulfur dioxide in the sodium sulfonate solution to generate sodium sulfate, sodium p-toluenesulfonate and sodium sulfite. The sodium sulfate produced by the reaction is rapidly adsorbed on the inner wall of the alkali tank 5 due to the common ion effect. When a certain thickness is reached, the bottom scraper 12 and the side scraper 13 scrape the sodium sulfate off, and under the action of the rapid stirring of the paddle 10, the sodium sulfate is crushed and dissolved in the sodium sulfonate solution. When the pH is higher than the upper limit, the feed valve 22, the caustic soda flake auger 2 and the gate valve 18 are closed.

[0044] When the liquid level of the alkali-refining tank 5 reaches the upper limit of the set liquid level, the extraction pump 9 is turned on to pump the sodium sulfonate solution into the sodium sulfonate warehouse. When the liquid level of the alkali-refining tank 5 reaches the lower limit of the liquid level, the extraction pump 9 stops running, and the opening of the regulating valve 4 is adjusted to keep the liquid level between the upper and lower limits, thereby achieving continuous neutralization. When the caustic soda in the caustic soda silo 17 is reduced to the lower limit, the sound and light prompter prompts the staff to refill the material through sound and light.

[0045] It should be noted that the distribution control box is used for line connection and control settings. The sound and light indicator is a prior art and is installed on the distribution control box but is not marked in the drawings in the specification.

[0046] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention shall fall within the scope of protection of the present invention.

[0047] The technology, shape and structure parts not described in detail in the present invention are all known technologies.

Claims

1. A neutralization device for neutralizing sodium sulfonate solution with solid caustic soda flakes, characterized in that: It includes an aging kettle, a caustic soda ash auger, and a caustic soda ash silo. The aging kettle is connected to a caustic soda ash ...

2. The neutralization device for neutralizing sodium sulfonate solution with solid caustic soda flakes according to claim 1, characterized in that: There are multiple paddles, which are installed in the middle position of the shaft end of the agitator. There are two connecting rods, which are symmetrically installed at the bottom position of the shaft end of the agitator. There are two bottom scrapers, which are respectively welded to the bottom of the two connecting rods. There are two side scrapers, which are respectively welded to one end of the connecting rod close to the inner wall of the alkali tank.

3. The neutralization device for neutralizing sodium sulfonate solution with solid caustic soda flakes according to claim 2, characterized in that: A notch is arranged on the top of the side scraper, a mounting plate is welded on the top of the side scraper, the pulley is bolted to the mounting plate, and the pulley is bolted to the side scraper through the mounting plate.

4. The neutralization device for neutralizing sodium sulfonate solution with solid caustic soda flakes according to claim 3, characterized in that: The alkali-removing tank is a circular tank body, the cross section of the slide is L-shaped, the slide as a whole matches the shape of the inner wall of the alkali-removing tank to form a ring, and the slide passes through the gap of the side scraper.

5. The neutralization device for neutralizing sodium sulfonate solution with solid caustic soda flakes according to claim 1, characterized in that: The production pump is a submersible pump, and the feed end of the production pump is located at the bottom of the alkali tank and does not contact the side scraper, the bottom scraper, and the paddle.

6. The neutralization device for neutralizing sodium sulfonate solution with solid caustic soda flakes according to claim 1, characterized in that: An online weighing device is installed on the caustic soda ash silo, a feeding valve is installed at the discharge end of the caustic soda ash silo, and the caustic soda ash silo is electrically connected to the power distribution control box through the online weighing device and the feeding valve.

7. The neutralization device for neutralizing sodium sulfonate solution with solid caustic soda flakes according to claim 6, characterized in that: The measuring end of the online pH detector is located at the bottom of the caustic soda tank and does not contact the side scraper, the bottom scraper, and the paddle. The online pH detector is interlocked with the plug valve, the caustic soda auger, and the feeding valve.

8. The neutralization device for neutralizing sodium sulfonate solution with solid caustic soda flakes according to claim 6, characterized in that: The power distribution control box is electrically connected with an audible and visual prompter, and the audible and visual prompter is interlocked with an online weighing device.

9. The neutralization device for neutralizing sodium sulfonate solution with solid caustic soda flakes according to claim 1, characterized in that: The online liquid level meter is a non-contact liquid level meter, and the online liquid level meter is interlocked with the production pump.

10. The neutralization device for neutralizing sodium sulfonate solution with solid caustic soda flakes according to claim 1, characterized in that: The output end of the alkali inlet pipeline is located below the highest liquid level of the alkali-making tank.

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