Washing device for removing phenol in three-mixed oil

Abstract

The utility model belongs to the technical field of chemical engineering, and particularly discloses a washing device for removing phenol in three mixed oil, which comprises a first naphthalene oil dephenolizing tower and a second naphthalene oil dephenolizing tower, and the first naphthalene oil dephenolizing tower comprises a first reactor and a neutral alkaline tank; the second naphthalene oil dephenolization tower comprises a secondary oil reactor, a primary alkaline phenate tank, a primary oil reactor and a secondary alkaline phenate tank; the lower part of the first naphthalene oil dephenolization tower is connected with an unwashed naphthalene oil input pipe; the upper part of the first naphthalene oil dephenolization tower is connected with a secondary alkaline phenate conveying pipe and a primary oil output pipe, and the other end of the primary oil output pipe is connected with a primary oil reactor; the other end of the secondary alkaline phenate conveying pipe is connected to the secondary alkaline phenate tank; the upper part of the primary oil reactor is connected with a secondary oil output pipe, and the other end of the secondary oil output pipe is connected to the secondary oil reactor. Convection is formed in the first reactor, sufficient reaction and separation can be achieved, the occupied area is small, and the washing reaction is sufficient.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical industry, and in particular relates to a washing device for removing phenol from three-mixed oil. Background Art

[0002] Phenol compounds are one of the basic raw materials of the organic chemical industry. They are widely used, such as in the production of synthetic fibers, engineering plastics, medicines, pesticides, plasticizers, antioxidants, dye intermediates and explosives. These phenolic compounds are mainly extracted from coal tar produced by coking.

[0003] The coal tar processing process produces tri-oil, which is a mixture of phenol, naphthalene oil and washing oil. Since phenol has a high industrial value, a washing and dephenolization process is usually used to dephenolize the tri-oil to recover the crude phenol in the tri-oil.

[0004] The existing three-mixed oil washing and dephenolization process usually adopts two methods: intermittent and two continuous washing and dephenolization. Intermittent washing adopts batch washing in a scrubber with a mechanical stirring or air stirring device. The washing times and reaction time can be flexibly controlled, but the production efficiency is low and the labor is large, and it has long been eliminated; the two continuous washing process has a large processing capacity and uses alkali solution to wash twice alternately to remove phenols and base compounds in the fraction, such as the Chinese utility model patent with announcement number CN211141961U, but it occupies a large area, has more equipment, consumes a slightly higher amount of alkali solution, and the washing and dephenolization is not complete. Utility Model Content

[0005] In view of the problems that the dephenolization device in the prior art occupies a large area, has many equipments, consumes a little more alkali solution, and the dephenolization by washing is not complete, a washing device for removing phenol from three-mixed oil is proposed. The utility model provides the following technical solutions:

[0006] A washing device for removing phenol from three mixed oils comprises a first naphthalene oil dephenolization tower and a second naphthalene oil dephenolization tower, wherein the first naphthalene oil dephenolization tower comprises a first reactor and a neutral alkaline tank in order from top to bottom; the second naphthalene oil dephenolization tower comprises a secondary oil reactor, a primary alkaline phenolate tank, a primary oil reactor, and a secondary alkaline phenolate tank in order from top to bottom; and the secondary oil reactor and the primary alkaline phenolate tank, the first reactor and the neutral alkaline tank, and the primary oil reactor and the secondary alkaline phenolate tank are all connected by a regulating valve bypass; the lower part of the first reactor is connected with an unwashed naphthalene oil input pipe for inputting unwashed naphthalene oil ; The upper part of the first reactor is connected with a secondary alkaline phenol salt delivery pipe for inputting secondary alkaline phenol salt and a primary oil output pipe for outputting the primary oil after dephenolization, and the other end of the primary oil output pipe is connected to the primary oil reactor; the other end of the secondary alkaline phenol salt delivery pipe is connected to the secondary alkaline phenol salt tank; the upper part of the primary oil reactor is connected with a secondary oil output pipe, and the other end of the secondary oil output pipe is connected to the secondary oil reactor; a production pipe for washing naphthalene oil is arranged on the upper side of the secondary oil output pipe; water pumps and valves are arranged on the unwashed naphthalene oil input pipe, the primary oil output pipe, the secondary alkaline phenol salt delivery pipe and the secondary oil output pipe.

[0007] Preferably, a primary phenate pipe is connected to the lower part of the primary alkaline phenate tank, and the other end of the primary phenate pipe is connected to the primary oil output pipe.

[0008] Preferably, the lower side of the neutral alkaline tank is connected to a neutral phenate tank via a neutral phenate pipe, and a phenate extraction pump is installed on the neutral phenate pipe.

[0009] Preferably, a regulating valve is connected to the phenate pipe.

[0010] Preferably, the secondary oil output pipe is connected to a diluted alkali mixer.

[0011] Preferably, liquid level gauges are installed and connected to the outside of the first reactor, the secondary oil reactor and the primary oil reactor.

[0012] Preferably, regulating valves are installed on both the primary alkaline phenate tank and the secondary alkaline phenate delivery pipe.

[0013] Preferably, a regulating valve and a flow meter are installed on the regulating valve bypass.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The tower stacking setting improves the space utilization, saves four buffer tanks and saves space;

[0016] 2. The first reactor is fed by convection jetting at the upper and lower parts to ensure full reaction;

[0017] 3. After three-stage full reaction and separation, the separation effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a specific embodiment of the utility model;

[0019] In the attached drawings, 1, the first naphthalene oil dephenolization tower; 110, the first reactor; 120, the neutral alkaline tank; 2, the second naphthalene oil dephenolization tower; 21, the secondary oil reactor; 22, the primary alkaline phenolate tank; 23, the primary oil reactor; 24, the secondary alkaline phenolate tank; 3, the unwashed naphthalene oil input pipe; 4, the secondary alkaline phenolate delivery pipe; 5, the primary oil output pipe; 6, the secondary oil output pipe; 61, the dilute alkali mixer; 7, the primary phenolate pipe; 8, the production pipe; 9, the neutral phenolate pipe; 10, the regulating valve bypass; 11, the regulating valve; 12, the liquid level meter. DETAILED DESCRIPTION

[0020] The directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only referenced to the directions of the drawings. Therefore, the directional words used are used to illustrate rather than limit the invention of the utility model.

[0021] like Figure 1 As shown, a washing device for removing phenol from three mixed oils comprises a first naphthalene oil dephenolization tower 1 and a second naphthalene oil dephenolization tower 2, wherein the first naphthalene oil dephenolization tower 1 comprises a first reactor 110 and a neutral alkaline tank 120 from top to bottom in sequence; the second naphthalene oil dephenolization tower 2 comprises a secondary oil reactor 21, a primary alkaline phenolate tank 22, a primary oil reactor 23, and a secondary alkaline phenolate tank 24 from top to bottom in sequence; and the secondary oil reactor 21 and the primary alkaline phenolate tank 22, the first reactor 110 and the neutral alkaline tank 120, and the primary oil reactor 23 and the secondary alkaline phenolate tank 24 are all connected through a regulating valve bypass 10; the lower part of the first naphthalene oil dephenolization tower 1 is connected with a valve for inputting unwashed naphthalene oil. The unwashed naphthalene oil input pipe 3 is connected to the upper part of the first reactor 110; the secondary alkaline phenolate delivery pipe 4 for inputting secondary alkaline phenolate and the primary oil output pipe 5 for outputting the primary oil after dephenolization are connected, and the other end of the primary oil output pipe 5 is connected to the primary oil reactor 23; the other end of the secondary alkaline phenolate delivery pipe 4 is connected to the secondary alkaline phenolate tank 24; the upper part of the primary oil reactor 23 is connected to the secondary oil output pipe 6, and the other end of the secondary oil output pipe 6 is connected to the secondary oil reactor 21; the upper side of the secondary oil output pipe 6 is provided with a production pipe 8 for the production of washed naphthalene oil; the unwashed naphthalene oil input pipe 3, the primary oil output pipe 5, the secondary alkaline phenolate delivery pipe 4 and the secondary oil output pipe 6 are all provided with water pumps and valves. The first naphthalene oil dephenolization tower 1 and the second naphthalene oil dephenolization tower 2 constitute a three-stage washing device, and the unwashed naphthalene oil and the secondary alkaline phenolate are in convection contact in the first reactor 110, and are fully reacted and separated through the three-stage scrubber, with less equipment and small footprint, sufficient washing reaction, and high automation level.

[0022] Specifically, the lower part of the primary alkaline phenate tank 22 is connected to a primary phenate pipe 7, and the other end of the primary phenate pipe 7 is connected to the primary oil output pipe 5, ensuring that the mixing process of the alkaline phenate and the oil is more efficient and continuous, reducing the complexity and uncertainty of manual operation, and improving production efficiency and product quality.

[0023] Specifically, the lower side of the neutral alkaline tank 120 is connected to a neutral phenate tank through a neutral phenate pipe 9, and a phenate extraction pump is installed on the neutral phenate pipe 9, which saves manpower, improves the recovery rate and utilization rate of phenate, and reduces production costs.

[0024] Specifically, the phenate pipe is connected with a regulating valve 11, which can accurately control the flow rate of the phenate, ensuring that the mixing ratio of the phenate and the oil or other materials is accurately controllable, thereby improving the quality stability of the final product and the flexibility of the production process.

[0025] Specifically, the secondary oil output pipe 6 is connected to a diluted alkali mixer 61, which realizes online mixing of oil and diluted alkali, simplifies the production process, improves production efficiency, and ensures the uniformity and consistency of mixing, providing a better basis for subsequent processing.

[0026] Specifically, the first reactor 110, the secondary oil reactor 21 and the primary oil reactor 23 are all connected to the outside with a liquid level meter 12. The liquid level of the reactor can be monitored in real time to ensure the safety and stability of the production process and prevent production accidents or product quality problems caused by excessively high or low liquid levels.

[0027] Specifically, regulating valves 11 are installed on the primary alkaline phenate tank 22 and the secondary alkaline phenate delivery pipe 4, so that the delivery and mixing process of the alkaline phenate is more flexible and controllable, and the flow rate and mixing ratio of the phenate can be adjusted according to production needs to meet different production needs.

[0028] Specifically, a regulating valve 11 and a flow meter are installed on the regulating valve bypass 10, providing bypass regulation and monitoring functions. When the main regulating valve 11 has problems or needs maintenance, production can be maintained through the bypass. At the same time, the flow meter can monitor the flow in real time to ensure the stability and controllability of the production process.

[0029] Working principle: the unwashed three-mixed oil and the secondary alkaline phenol salt from the bottom side of the primary oil reactor 23 undergo the first washing reaction in the first reactor 110; the unwashed three-mixed oil is fed into the lower part of the first reactor 110; the secondary alkaline phenol salt is fed into the upper part of the first reactor 110, and the two are sprayed and convected in the tower; the primary oil produced from the top of the first reactor 110 and the primary alkaline phenol salt produced from the secondary oil reactor 21 enter the primary oil reactor 23 through a mixer after being pumped for a second washing reaction; the secondary oil produced from the top of the primary oil reactor 23 and the dilute alkali enter the secondary oil reactor 21 through a mixer after being pumped for a third washing reaction; after three-stage sufficient reaction and separation, the separation effect is good.

Claims

1. A washing device for removing phenol from tri-mixed oil, characterized in that: The invention comprises a first naphthalene oil dephenolization tower (1) and a second naphthalene oil dephenolization tower (2), wherein the first naphthalene oil dephenolization tower (1) comprises, from top to bottom, a first reactor (110) and a neutral alkaline tank (120); the second naphthalene oil dephenolization tower (2) comprises, from top to bottom, a secondary oil reactor (21), a primary alkaline phenolate tank (22), a primary oil reactor (23), and a secondary alkaline phenolate tank (24); the secondary oil reactor (21) and the primary alkaline phenolate tank (22), the first reactor (110) and the neutral alkaline tank (120), and the primary oil reactor (23) and the secondary alkaline phenolate tank (24) are all connected via a regulating valve bypass (10); the lower part of the first reactor (110) is connected to an unwashed naphthalene oil input pipe (310) for inputting unwashed naphthalene oil; The first reactor (110) is connected to a secondary alkaline phenol salt delivery pipe (4) for inputting secondary alkaline phenol salt and a primary oil output pipe (5) for outputting primary oil after dephenolization at the upper part thereof, and the other end of the primary oil output pipe (5) is connected to the primary oil reactor (23); the other end of the secondary alkaline phenol salt delivery pipe (4) is connected to the secondary alkaline phenol salt tank (24); the upper part of the primary oil reactor (23) is connected to a secondary oil output pipe (6), and the other end of the secondary oil output pipe (6) is connected to the secondary oil reactor (21); a production pipe (8) for producing washed naphthalene oil is arranged on the upper side of the secondary oil output pipe (6); water pumps and valves are arranged on the unwashed naphthalene oil input pipe (3), the primary oil output pipe (5), the secondary alkaline phenol salt delivery pipe (4) and the secondary oil output pipe (6).

2. The washing device for removing phenol from tri-mixed oil according to claim 1, characterized in that: The lower part of the primary alkaline phenate tank (22) is connected to a primary phenate pipe (7), and the other end of the primary phenate pipe (7) is connected to a primary oil output pipe (5).

3. The washing device for removing phenol from tri-mixed oil according to claim 1, characterized in that: The lower side of the neutral alkaline tank (120) is connected to a neutral phenate tank via a neutral phenate pipe (9), and a phenate extraction pump is installed on the neutral phenate pipe (9).

4. The washing device for removing phenol from tri-mixed oil according to claim 3, characterized in that: A regulating valve (11) is connected to the phenol salt pipe.

5. The washing device for removing phenol from tri-mixed oil according to claim 1, characterized in that: The secondary oil output pipe (6) is connected to a diluted alkali mixer (61).

6. The washing device for removing phenol from tri-mixed oil according to claim 1, characterized in that: Liquid level gauges (12) are installed and connected to the outside of the first reactor (110), the secondary oil reactor (21) and the primary oil reactor (23).

7. The washing device for removing phenol from tri-mixed oil according to claim 1, characterized in that: The primary alkaline phenate tank (22) and the secondary alkaline phenate delivery pipe (4) are both equipped with regulating valves (11).

8. The washing device for removing phenol from tri-mixed oil according to claim 1, characterized in that: A regulating valve (11) and a flow meter are installed on the regulating valve bypass (10).

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