CN111349454A

CN111349454A - Aromatic purification extraction separation device

Info

Publication number: CN111349454A
Application number: CN202010089825.0A
Authority: CN
Inventors: 石允起; 李西春; 孙江; 崔云龙; 李广凯
Original assignee: Dongying Weilian Chemical Co ltd
Current assignee: Dongying Weilian Chemical Co ltd
Priority date: 2020-02-13
Filing date: 2020-02-13
Publication date: 2020-06-30

Abstract

The invention provides an aromatic hydrocarbon purification, extraction and separation device, and mainly relates to the field of petrochemical industry. The utility model provides a separation device is extracted in arene purification, includes extraction tower casing, extraction tower casing top-down comprises last clarification section, mixing section and lower clarification section, it sets up the motor to go up clarification section top, set up the (mixing) shaft that runs through its head and the tail in the extraction tower casing, be linear evenly on the (mixing) shaft and set up a plurality of carousels, set up a plurality of inner rings of crossing the arrangement with the carousel on the mixing section inner wall, the (mixing) shaft is hollow (mixing) shaft, be the circumference evenly set up the orifice that is connected with the hollow inner chamber of (mixing) shaft on a plurality of carousels that the (mixing) shaft top set up, set up the pump. The invention has the beneficial effects that: the invention can increase the mixing condition of the raw oil and the extraction solvent on the basis of the rotating disc type extraction tower, so that the contact area between the raw oil and the extraction solvent is larger, thereby improving the extraction efficiency of the aromatic hydrocarbon.

Description

Aromatic purification extraction separation device

Technical Field

The invention mainly relates to the field of petrochemical industry, in particular to an aromatic hydrocarbon purification, extraction and separation device.

Background

The aromatic hydrocarbon is mainly benzene, toluene and xylene, and is one of the most important basic raw materials for producing petrochemical products. Among them, benzene, toluene and xylene are also called primary basic organic raw materials, and are mainly used for producing synthetic materials such as nylon, polyurethane, alkyd resin and the like. The large-scale industrial production of aromatics is realized by an aromatics complex. Typical aromatics complex plants include naphtha hydrogenation, reforming or pyrolysis gasoline hydrogenation, etc. to produce aromatics and aromatics conversion and aromatics separation plants. At present, an aromatic hydrocarbon extraction device mostly adopts sulfolane solvent to carry out extraction and purification in a sieve plate or a rotating disc type extraction tower, wherein the rotating disc type extraction tower has better extraction and purification effects on aromatic hydrocarbon compared with a sieve plate type extraction tower. However, when the purification extraction of the aromatic hydrocarbon is carried out by using the rotating disc type extraction tower, the possibility that the extraction efficiency can be improved still exists. Because the aromatics in the raw oil cannot be completely extracted in the process of the staggered phase convergence of the heavy-phase sulfolane serving as a solvent and the light-phase raw oil, and the stirring effect of the rotary disc is extremely limited, the aromatics in the raw oil can be extracted at a higher concentration only by stirring for a longer time.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides an aromatic hydrocarbon purification, extraction and separation device which can increase the mixing condition of raw oil and an extraction solvent on the basis of a rotating disc type extraction tower, so that the contact area between the raw oil and the extraction solvent is larger, and the extraction efficiency of aromatic hydrocarbon is improved.

In order to achieve the purpose, the invention is realized by the following technical scheme:

an aromatic hydrocarbon purification extraction separation device comprises an extraction tower shell, wherein the extraction tower shell consists of an upper clarification section, a mixing section and a lower clarification section from top to bottom, a heavy phase inlet and a light phase outlet are arranged on the upper clarification section, a light phase inlet and a heavy phase outlet are arranged on the lower clarification section, a motor is arranged at the top of the upper clarification section, a stirring shaft penetrating through the head and the tail of the extraction tower shell is arranged in the extraction tower shell and used for driving the stirring shaft, a plurality of rotating discs are linearly and uniformly arranged on the stirring shaft, a plurality of inner rings which are staggered with the rotating discs are arranged on the inner wall of the mixing section, the stirring shaft is a hollow stirring shaft, spray holes connected with the hollow inner cavity of the stirring shaft are uniformly arranged on the plurality of rotating discs arranged at the top of the stirring shaft in a circumferential manner, a pump body is arranged in the lower clarification section and used for supplying liquid to the hollow inner cavity of the, the multi-stage heating device is used for maintaining the temperature difference between the top and the bottom of the shell of the extraction tower.

The turntable with the height above the top 1/7 of the stirring shaft is provided with a spray hole.

The top of the stirring shaft is connected with a top surface bearing of the upper clarification section, a sealing end cover is arranged at the joint of the bearings, a mounting seat is arranged in the lower clarification section, and the bottom of the stirring shaft is mounted with the bearing of the mounting seat.

The stirring shaft is characterized in that a liquid outlet pipe is connected to the pump body and is a metal pipeline, the liquid outlet pipe extends into the inner cavity of the stirring shaft, and the liquid outlet pipe is not in contact with the inner cavity of the stirring shaft.

The gap between the liquid outlet pipe and the inner cavity of the stirring shaft is 2-5 mm.

Signal connection controller on the motor, the controller is used for controlling the motor is 180 degrees in reciprocating rotation, be connected with the drain pipe on the pump body, the drain pipe is soft drain pipe, soft drain pipe can dismantle fixed connection with the (mixing) shaft inner chamber.

The multistage heating device comprises a first-stage oil bath cylinder arranged on the outer wall of the upper clarification section, a second-stage oil bath cylinder arranged on the outer wall of the mixing section and a third-stage oil bath cylinder arranged on the outer wall of the lower clarification section.

The heating temperature of the primary oil bath cylinder is 165-175 ℃, the heating temperature of the secondary oil bath cylinder is 170-180 ℃, and the heating temperature of the tertiary oil bath cylinder is 180-195 ℃.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the sulfolane solvent and the raw oil are vertically mixed in the shell of the extraction tower in a staggered manner, so that the sulfolane solvent and the raw oil can slowly flow under the staggered action of the rotary disc and the inner ring in the extraction tower, and finally layered clarification is realized. The two extraction processes are staggered into a first section, after the sulfolane solvent and the raw oil are layered, the pump body pumps heavy-phase sulfolane into the hollow rotating shaft, and the sulfolane is sprayed into the upper layer of the raw oil light phase through the spray holes on the rotary table, so that the two are secondarily mixed, the contact area between the two is increased, the extraction efficiency of the aromatic hydrocarbon is improved, and the extraction and purification time is saved.

Drawings

FIG. 1 is a schematic view of the present invention in partial cross-section;

FIG. 2 is a partially enlarged structural view of part A of the present invention;

FIG. 3 is a partially enlarged view of the part B of the present invention.

Reference numerals shown in the drawings: 1. extracting a tower shell; 2. an upper clarification section; 3. a mixing section; 4. a lower clarification section; 5-1, a heavy phase inlet; 5-2, light phase outlet; 6-1, a light phase inlet; 6-2, a heavy phase outlet; 7. a motor; 8. a stirring shaft; 9. a turntable; 10. an inner ring; 11. spraying a hole; 12. a pump body; 13. a multi-stage heating device; 14. sealing the end cap; 15. a mounting seat; 16. a liquid outlet pipe; 17. a primary oil bath cylinder; 18. a secondary oil bath cylinder; 19. and a three-stage oil bath cylinder.

Detailed Description

The invention is further described with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.

As shown in fig. 1-3, the aromatic hydrocarbon purification, extraction and separation device of the present invention comprises an extraction tower casing 1 in a sealed state, wherein the extraction tower casing can isolate air to prevent oxidation of sulfolane solvent during operation. Wherein, before the extraction of the aromatic hydrocarbon, nitrogen is preferably firstly introduced to replace the air in the shell of the extraction tower. The extraction tower shell 1 consists of an upper clarification section 2, a mixing section 3 and a lower clarification section 4 from top to bottom, wherein the upper clarification section is a standing cavity for light-phase raw oil, the lower clarification section is a standing cavity for heavy-phase sulfolane solvent, and the mixing section is a generation cavity for staggered mixing of the upper clarification section and the lower clarification section. The upper clarification section 2 is provided with a heavy phase inlet 5-1 and a light phase outlet 5-2, and the lower clarification section 4 is provided with a light phase inlet 6-1 and a heavy phase outlet 6-2. A motor 7 is arranged above the top of the upper clarification section 2, a stirring shaft 8 penetrating through the head and the tail of the extraction tower casing 1 is rotatably arranged in the extraction tower casing 1, the motor 7 is used for driving the stirring shaft 8, a plurality of rotating discs 9 are linearly and uniformly arranged on the stirring shaft 8, a plurality of inner rings 10 which are staggered with the rotating discs 9 are arranged on the inner wall of the mixing section 3, namely, an inner ring is arranged in a gap area between two adjacent rotating discs. The stirring shaft 8 is a hollow stirring shaft, a plurality of rotating discs 9 arranged at the top of the stirring shaft 8 are circumferentially and uniformly provided with spray holes 11 connected with a hollow inner cavity of the stirring shaft 8, a pump body 12 is arranged at the bottom in the lower clarification section 4, and the pump body 12 is used for supplying liquid to the hollow inner cavity of the stirring shaft 8, so that a heavy-phase sulfolane solvent is sprayed out from the spray holes and mixed in the top-layer light-phase raw oil, thereby increasing the contact area of the heavy-phase sulfolane solvent and the top-layer light-phase raw oil and accelerating the. The multistage heating device 13 is arranged outside the extraction tower shell 1 from top to bottom, the multistage heating device 13 is used for keeping the temperature difference between the top and the bottom of the extraction tower shell 1, and the sulfolane solvent can be prevented from aging due to pyrolysis on the premise of ensuring the higher extraction effect of the sulfolane solvent by adjusting the temperature difference between the top and the bottom of the extraction tower. On the basis of the mechanical structure of the extraction tower, the stirring turntable of the extraction tower is modified, so that a heavy-phase sulfolane solvent can be dispersed in light-phase raw oil under the dynamic action of a pump body, and the raw oil and the sulfolane solvent are secondarily mixed, thereby increasing the contact area between the heavy-phase sulfolane solvent and the light-phase raw oil to shorten the extraction time of aromatic hydrocarbon.

Specifically, the rotating disc 9 above the top 1/7 of the stirring shaft 8 is provided with a spray hole 11. The solvent ratio of the sulfolane solvent in the process of extracting the aromatic hydrocarbon is 4-5, and except the volume of the upper clarification section, the sulfolane solvent can be mixed in the bottom area of the light-phase raw oil to promote the extraction of the aromatic hydrocarbon.

Specifically, the top of the stirring shaft 8 is connected with a bearing on the top surface of the upper clarification section 2, a sealing end cover 14 is arranged at the joint of the bearings, and the top of the stirring shaft penetrates through the sealing end cover to be connected with a motor shaft of the motor through a coupler. And a mounting seat 15 is arranged in the lower clarification section 4, and the bottom of the stirring shaft 8 is mounted with the mounting seat 15 in a bearing manner. The mounting seat is fixed with the bearing of the upper clarification section, so that the stable rotation of the stirring shaft in the shell of the extraction tower can be ensured.

Specifically, be connected with drain pipe 16 on the pump body 12, drain pipe 16 is the metal pipeline, drain pipe 16 extends into the 8 inner chambers of (mixing) shaft,

drain pipe

16 and 8 inner chambers of (mixing) shaft contactless.

Specifically, the gap between the liquid outlet pipe and the inner cavity of the stirring shaft 8 is 2-5mm, so that the liquid supply effect of the pump body to the inner cavity of the stirring shaft can be ensured under the condition of preventing the liquid outlet pipe and the inner cavity of the stirring shaft from rubbing against each other.

Concretely, signal connection controller on the motor 7, the controller is used for control motor 7 reciprocating rotation 180 degrees, be connected with drain pipe 16 on the pump body 12, drain pipe 16 is soft drain pipe, soft drain pipe can dismantle fixed connection with the (mixing) shaft 8 inner chamber. Through the reciprocal rotation of controller control motor, can make the rotation of (mixing) shaft be unlikely to influence the confession liquid of soft drain pipe, provide new mode for the confession liquid mode of the pump body, supply liquid through soft drain pipe, leakage that can corresponding reduction sulfolane solution to improve the confession liquid efficiency of the pump body.

Specifically, the multistage heating device 13 comprises a primary oil bath barrel 17 arranged on the outer wall of the upper clarification section 2, a secondary oil bath barrel 18 arranged on the outer wall of the mixing section 3, and a tertiary oil bath barrel 19 arranged on the outer wall of the lower clarification section 4. The oil bath cylinders are heated by electric heaters, and each oil bath cylinder is provided with a temperature relay for controlling the heating of the oil bath cylinder to each section of the device.

Specifically, the heating temperature of the primary oil bath cylinder 17 is 165-175 ℃, the heating temperature of the secondary oil bath cylinder 18 is 170-180 ℃, and the heating temperature of the tertiary oil bath cylinder 19 is 180-195 ℃.

Example (b):

when the device is used, nitrogen is firstly introduced into a light phase inlet, air in a shell of the extraction tower is replaced, then the multistage heating device is opened, raw oil after water filtration is introduced into the light phase inlet at the bottom after the barrel is heated for 5-10 minutes through multiple stages, sulfolane solvent is introduced into the heavy phase inlet at the top, the motor is started, and the stirring shaft is driven by the motor to drive the rotating disc to rotate. Raw oil and sulfolane solvent mix at the mixed section to separate gradually, raw oil is clarified from the top, sulfolane solvent is clarified from the bottom, open the pump body this moment, supply liquid in to the (mixing) shaft cavity by the pump body, make the sulfolane solvent spout into in the raw oil from the orifice of top carousel, make sulfolane solvent and raw oil secondary mix, thereby accelerate the efficiency of secondary extraction, thereby play and save the extraction time, improve the purpose of extracting efficiency. And stopping operation after the pump body is started for 10-20 minutes, stopping the motor at the moment, after the raw oil and the sulfolane solvent are respectively stood and clarified, extracting the raw oil from the light phase outlet, and discharging the sulfolane solvent from the heavy phase outlet.

Claims

1. The utility model provides an arene purification extraction separation device, includes extraction tower casing (1), characterized by: the extraction tower comprises an extraction tower shell (1) and is characterized in that the extraction tower shell comprises an upper clarification section (2), a mixing section (3) and a lower clarification section (4) from top to bottom, a heavy phase inlet (5-1) and a light phase outlet (5-2) are arranged on the upper clarification section (2), a light phase inlet (6-1) and a heavy phase outlet (6-2) are arranged on the lower clarification section (4), a motor (7) is arranged at the top of the upper clarification section (2), a stirring shaft (8) penetrating through the head and the tail of the extraction tower shell (1) is arranged in the extraction tower shell, the motor (7) is used for driving the stirring shaft (8), a plurality of turntables (9) are linearly and uniformly arranged on the stirring shaft (8), a plurality of inner rings (10) which are staggered with the turntables (9) are arranged on the inner wall of the mixing section (3), the stirring shaft (8) is a hollow stirring shaft, and a plurality of turntables (9) arranged at the top of the stirring shaft ( The device comprises a lower clarifying section (4), a pump body (12) is arranged in the lower clarifying section (4), the pump body (12) is used for supplying liquid to a hollow inner cavity of a stirring shaft (8), a multi-stage heating device (13) is arranged outside an extraction tower shell (1) from top to bottom, and the multi-stage heating device (13) is used for keeping the temperature difference between the top and the bottom of the extraction tower shell (1).

2. The device for purifying, extracting and separating aromatic hydrocarbon according to claim 1, which is characterized in that: the rotating disc (9) above the top 1/7 of the stirring shaft (8) is provided with a jet hole (11).

3. The device for purifying, extracting and separating aromatic hydrocarbon according to claim 1, which is characterized in that: the top of the stirring shaft (8) is connected with a top surface bearing of the upper clarification section (2), a sealing end cover (14) is arranged at the joint of the bearings, a mounting seat (15) is arranged in the lower clarification section (4), and the bottom of the stirring shaft (8) is mounted with the mounting seat (15) through a bearing.

4. The device for purifying, extracting and separating aromatic hydrocarbon according to claim 3, wherein: be connected with drain pipe (16) on pump body (12), drain pipe (16) are metal pipeline, drain pipe (16) extend into (mixing) shaft (8) inner chamber, drain pipe (16) and (mixing) shaft (8) inner chamber contactless.

5. The device for purifying, extracting and separating aromatic hydrocarbon according to claim 4, wherein: the gap between the liquid outlet pipe and the inner cavity of the stirring shaft (8) is 2-5 mm.

6. The device for purifying, extracting and separating aromatic hydrocarbon according to claim 3, wherein: signal connection controller on motor (7), the controller is used for control motor (7) reciprocating rotation 180 degrees, be connected with drain pipe (16) on the pump body (12), drain pipe (16) are soft drain pipe, soft drain pipe can dismantle fixed connection with (mixing) shaft (8) inner chamber.

7. The device for purifying, extracting and separating aromatic hydrocarbon according to claim 1, which is characterized in that: the multistage heating device (13) comprises a first-stage oil bath cylinder (17) arranged on the outer wall of the upper clarification section (2), a second-stage oil bath cylinder (18) arranged on the outer wall of the mixing section (3), and a third-stage oil bath cylinder (19) arranged on the outer wall of the lower clarification section (4).

8. The apparatus for purifying, extracting and separating aromatic hydrocarbons as claimed in claim 7, wherein: the heating temperature of the primary oil bath cylinder (17) is 165-175 ℃, the heating temperature of the secondary oil bath cylinder (18) is 170-180 ℃, and the heating temperature of the tertiary oil bath cylinder (19) is 180-195 ℃.