Equipment for purifying thiophene by azeotropic distillation of crude benzene

Abstract

The utility model discloses equipment for purifying thiophene by azeotropic distillation of crude benzene, which comprises a mounting plate, and the upper surface of the mounting plate is fixedly connected with a primary distillation tower, a benzene fraction tower, an extractive distillation tower and an extractant regeneration tower respectively. The device is provided with a primary distillation tower, a benzene fraction tower, an extractive distillation tower, an extractant regeneration tower, an extraction secondary distillation tower, an extractant secondary regeneration tower, a thiophene refining tower, a hydrogenation feeding buffer tank, a benzene fraction assembly and a benzene hydrogenation removal system, and then a carbon disulfide product meeting the requirements is produced by adopting common distillation and precise distillation modes. According to the technology for extracting thiophene from crude benzene, high-added-value thiophene and carbon disulfide in crude benzene are separated and purified through a rectification process by utilizing the difference of boiling points and polarities of various substances in crude benzene, the recycling of thiophene and carbon disulfide in crude benzene is a physical process, and compared with synthesis of thiophene with butylene and sulfur and synthesis of carbon disulfide with natural gas and sulfur, the technology has the advantages that the cost is low; and the production process is safer and more reliable.

Description

Technical Field

[0001] The utility model relates to the field of crude benzene, in particular to a device for azeotropic distillation and purification of thiophene in crude benzene. Background Technique

[0002] Crude benzene is one of the products in the crude gas generated by the pyrolysis of coal. It is a benzene compound recovered from the coke oven gas after deammoniation, mainly containing benzene, and is called crude benzene. Crude benzene is a light yellow transparent liquid, lighter than water, insoluble in water. During storage, due to unsaturated compounds, oxidation and polymerization form resin substances that dissolve in crude benzene, causing the color to darken.

[0003] At the present stage, when crude benzene undergoes a hydrogenation reaction, the hydrogen consumption is large, the temperature difference in the reactor is large, and at the same time, the side reactions of the three benzenes are relatively high, resulting in losses of the three benzenes, affecting the processing load of the device. In addition, it increases the energy consumption of the benzene hydrogenation device and reduces the processing capacity and economic benefits of the benzene hydrogenation device. Therefore, we propose a device for azeotropic distillation and purification of thiophene in crude benzene to solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a device for azeotropic distillation and purification of thiophene in crude benzene to solve the problems mentioned in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A device for azeotropic distillation and purification of thiophene in crude benzene includes a mounting plate. The upper surface of the mounting plate is fixedly connected with a primary distillation column, a benzene fraction column, an extractive distillation column, an extractant regeneration column, an extractive secondary distillation column, an extractant secondary regeneration column, and a thiophene refining column respectively. The right side surface of the primary distillation column is fixedly communicated with a crude benzene tank area connecting pipe. The left side surface of the thiophene refining column is fixedly communicated with a thiophene finished product drainage pipe. The back surface of the primary distillation column is fixedly communicated with a hydrogenation feed buffer tank. The back surface of the benzene fraction column is fixedly communicated with a benzene fraction assembly. The back surface of the benzene fraction column is fixedly communicated with a hydrogenation device. The back surface of the extractive distillation column is fixedly communicated with a benzene to hydrogenation system. The back surface of the extractant regeneration column is fixedly communicated with an extractant recycling assembly. The primary distillation column is fixedly communicated with the benzene fraction column through a first conduit. The benzene fraction assembly is fixedly communicated with the extractive distillation column and the extractive secondary distillation column through a three-way pipe. The extractive distillation column is fixedly communicated with the extractant regeneration column through a second conduit. The extractant regeneration column is fixedly communicated with the extractive distillation column through a third conduit. The extractant regeneration column is fixedly communicated with the extractive secondary distillation column through a fourth conduit. The extractive secondary distillation column is fixedly communicated with the extractant secondary regeneration column through a fifth conduit. The extractant secondary regeneration column is fixedly communicated with the extractive secondary distillation column through a sixth conduit. The extractant secondary regeneration column is fixedly communicated with the thiophene refining column through a seventh conduit.

[0007] In a further embodiment, an anti-corrosion pad is fixedly connected to the bottom surface of the mounting plate, and the anti-corrosion pad is made of rubber material.

[0008] In a further embodiment, a set of mounting holes are formed on the upper surface of the mounting plate, and a set of mounting screws are provided outside the mounting plate.

[0009] In a further embodiment, a control display screen is fixedly connected to the upper surface of the mounting plate, and an anti-corrosion layer is sprayed on the outer surface of the mounting plate.

[0010] In a further embodiment, a controller is fixedly connected to the upper surface of the mounting plate, and the mounting plate is made of steel.

[0011] In a further embodiment, a nameplate is fixedly connected to the upper surface of the mounting plate, and a waterproof layer is sprayed on the outer surface of the nameplate.

[0012] In a further embodiment, two reinforcing blocks are fixedly connected to the outer surfaces of the pre-distillation tower, benzene fractionation tower, extractive distillation tower, extractant regeneration tower, secondary extractive distillation tower, secondary extractant regeneration tower, and thiophene purification tower. The bottom surface of each reinforcing block is fixedly connected to the upper surface of the mounting plate.

[0013] In a further embodiment, observation windows are fixedly inlaid on the outer surfaces of the pre-distillation tower, benzene fractionation tower, extractive distillation tower, extractant regeneration tower, secondary extractive distillation tower, secondary extractant regeneration tower, and thiophene purification tower. The observation windows are made of tempered glass.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] This device is equipped with a prefractionating column, a benzene fraction column, an extractive distillation column, an extractant regeneration column, a secondary extractive distillation column, a secondary extractant regeneration column, a thiophene purification column, a hydrogenation feed buffer tank, a benzene fraction component, a benzene to hydrogenation system, an extractant recycling component, and a hydrogenation device. It can first remove light components such as cyclopentadiene and carbon disulfide with boiling points lower than that of benzene from the crude benzene, and then remove heavy components such as toluene and xylene with boiling points higher than that of benzene, producing a benzene fraction containing thiophene. After that, an extractive distillation method is used to produce a qualified thiophene product. For cyclopentadiene in the light components such as cyclopentadiene and carbon disulfide with boiling points lower than that of benzene, taking advantage of the characteristic of double bond association, it is first dimerized into high-boiling dicyclopentadiene at low temperature to increase the boiling point difference between cyclopentadiene and carbon disulfide. Then, an ordinary distillation and a precision distillation method are used to produce a qualified carbon disulfide product. Moreover, the technology for extracting thiophene from crude benzene utilizes the differences in boiling points and polarities of various substances in the crude benzene, and separates and purifies high-value-added thiophene and carbon disulfide in the crude benzene through the distillation process. The recovery of thiophene and carbon disulfide in the crude benzene is a physical process, which is safer and more reliable than synthesizing thiophene with butene and sulfur and synthesizing carbon disulfide with natural gas and sulfur. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the three-dimensional view of the prefractionating column in the equipment for purifying thiophene by azeotropic distillation of crude benzene.

[0017] Figure 2 It is a side view of the prefractionating column in the equipment for purifying thiophene by azeotropic distillation of crude benzene.

[0018] Figure 3 It is a rear view of the prefractionating column in the equipment for purifying thiophene by azeotropic distillation of crude benzene.

[0019] Figure 4 For the equipment for purifying thiophene by azeotropic distillation of crude benzene Figure 2 The schematic structural diagram of the partial enlargement at position A.

[0020] In the figure: 1. mounting plate; 2. prefractionating column; 3. benzene fraction column; 4. extractive distillation column; 5. extractant regeneration column; 6. secondary extractive distillation column; 7. secondary extractant regeneration column; 8. thiophene purification column; 9. thiophene finished product drainage pipe; 10. crude benzene tank area connecting pipe; 11. reinforcement block; 12. controller; 13. nameplate; 14. control display screen; 15. mounting hole; 16. mounting screw; 17. anti-corrosion pad; 18. observation window; 19. hydrogenation feed buffer tank; 20. benzene fraction component; 21. benzene to hydrogenation system; 22. extractant recycling component; 23. hydrogenation device. Detailed Description of the Invention

[0021] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0022] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific circumstances.

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0024] Please refer to Figures 1-4, in the present utility model, a device for purifying thiophene by azeotropic distillation of crude benzene includes a mounting plate 1. The upper surface of the mounting plate 1 is fixedly connected with a preliminary distillation column 2, a benzene fraction column 3, an extractive distillation column 4, an extractant regeneration column 5, an extractive secondary distillation column 6, an extractant secondary regeneration column 7, and a thiophene refining column 8. The right side surface of the preliminary distillation column 2 is fixedly communicated with a crude benzene tank area connecting pipe 10, and the left side surface of the thiophene refining column 8 is fixedly communicated with a thiophene finished product drainage pipe 9. The back surface of the preliminary distillation column 2 is fixedly communicated with a hydrogenation feed buffer tank 19, the back surface of the benzene fraction column 3 is fixedly communicated with a benzene fraction assembly 20, and the back surface of the benzene fraction column 3 is fixedly communicated with a hydrogenation device 23. The back surface of the extractive distillation column 4 is fixedly communicated with a benzene to hydrogenation system 21, and the back surface of the extractant regeneration column 5 is fixedly communicated with an extractant recycling assembly 22. The preliminary distillation column 2 is fixedly communicated with the benzene fraction column 3 through a first conduit. The benzene fraction assembly 20 is fixedly communicated with the extractive distillation column 4 and the extractive secondary distillation column 6 through a three-way pipe. The extractive distillation column 4 is fixedly communicated with the extractant regeneration column 5 through a second conduit. The extractant regeneration column 5 is fixedly communicated with the extractive distillation column 4 through a third conduit. The extractant regeneration column 5 is fixedly communicated with the extractive secondary distillation column 6 through a fourth conduit. The extractive secondary distillation column 6 is fixedly communicated with the extractant secondary regeneration column 7 through a fifth conduit. The extractant secondary regeneration column 7 is fixedly communicated with the extractive secondary distillation column 6 through a sixth conduit. The extractant secondary regeneration column 7 is fixedly communicated with the thiophene refining column 8 through a seventh conduit. The preliminary distillation column 2, the benzene fraction column 3, the extractive distillation column 4, the extractant regeneration column 5, the extractive secondary distillation column 6, the extractant secondary regeneration column 7, the thiophene refining column 8, the hydrogenation feed buffer tank 19, the benzene fraction assembly 20, the benzene to hydrogenation system 21, the extractant recycling assembly 22, and the hydrogenation system 23 can first remove light components such as cyclopentadiene and carbon disulfide with boiling points lower than that of benzene from the crude benzene, and then remove heavy components such as toluene and xylene with boiling points higher than that of benzene, producing a benzene fraction containing thiophene. Then, an extractive distillation method is used to produce a thiophene product that meets the requirements. Cyclopentadiene in light components such as cyclopentadiene and carbon disulfide with boiling points lower than that of benzene utilizes the characteristic of double bond association to first form high-boiling dicyclopentadiene at low temperature, increasing the boiling point difference between cyclopentadiene and carbon disulfide. Then, a common distillation and precision distillation method is used to produce a carbon disulfide product that meets the requirements. Moreover, the technology for extracting thiophene from crude benzene utilizes the differences in boiling points and polarities of various substances in the crude benzene to separate and purify high-value-added thiophene and carbon disulfide in the crude benzene through a distillation process. The recovery of thiophene and carbon disulfide in the crude benzene is a physical process, which is safer and more reliable than synthesizing thiophene with butene and sulfur and synthesizing carbon disulfide with natural gas and sulfur.

[0025] The bottom surface of the mounting plate 1 is fixedly connected with an anti-corrosion pad 17. The anti-corrosion pad 17 is made of rubber. By using the anti-corrosion pad 17, the corrosion resistance of the mounting plate 1 can be improved. A set of mounting holes 15 are provided on the upper surface of the mounting plate 1. A set of mounting screws 16 are provided outside the mounting plate 1. By using the mounting holes 15 and the mounting screws 16, the device can be conveniently fixed to the ground to avoid shaking. A control display screen 14 is fixedly connected to the upper surface of the mounting plate 1. An anti-corrosion layer is sprayed on the outer surface of the mounting plate 1. By using the control display screen 14, the operation of the electrical components can be conveniently set. A controller 12 is fixedly connected to the upper surface of the mounting plate 1. The mounting plate 1 is made of steel. By using the controller 12, the electrical components can be conveniently automated.

[0026] A nameplate 13 is fixedly connected to the upper surface of the mounting plate 1. A waterproof layer is sprayed on the outer surface of the nameplate 13. By using the nameplate 13, the brand recognition can be increased and the popularity can be improved. Two reinforcing blocks 11 are fixedly connected to the outer surfaces of the primary distillation tower 2, the benzene fraction tower 3, the extractive distillation tower 4, the extractant regeneration tower 5, the secondary extractive distillation tower 6, the secondary extractant regeneration tower 7, and the thiophene refining tower 8 together. The bottom surface of each reinforcing block 11 is fixedly connected to the upper surface of the mounting plate 1. By using the reinforcing blocks 11, the fixing performance of the primary distillation tower 2, the benzene fraction tower 3, the extractive distillation tower 4, the extractant regeneration tower 5, the secondary extractive distillation tower 6, the secondary extractant regeneration tower 7, and the thiophene refining tower 8 can be increased. Observation windows 18 are fixedly inlaid on the outer surfaces of the primary distillation tower 2, the benzene fraction tower 3, the extractive distillation tower 4, the extractant regeneration tower 5, the secondary extractive distillation tower 6, the secondary extractant regeneration tower 7, and the thiophene refining tower 8. The observation windows 18 are made of toughened glass. By using the observation windows 18, the internal working conditions of the primary distillation tower 2, the benzene fraction tower 3, the extractive distillation tower 4, the extractant regeneration tower 5, the secondary extractive distillation tower 6, the secondary extractant regeneration tower 7, and the thiophene refining tower 8 can be conveniently observed.

[0027] The working principle of the present utility model is:

[0028] First, crude benzene enters the interior of the preliminary distillation column 2 through the connecting pipe 10 of the crude benzene tank area. After dehydrogenation, light fraction components such as carbon disulfide return to the hydrogenation feed buffer tank 19, and the bottom material of the column enters the benzene fraction column 3; the material withdrawn from the top of the benzene fraction column 3 enters the extractive distillation column 4, and the bottom material of the column enters the heavy component removal column of the benzene hydrogenation unit; the pure benzene containing a small amount of thiophene withdrawn from the top of the extractive distillation column 4 enters the hydrogenation feed buffer tank 19, and the bottom material of the column enters the secondary regenerating column 7 of the extractant. The material withdrawn from the top of the secondary regenerating column 7 of the extractant enters the secondary rectifying column 6 of the extractant. The bottom extractant is recycled. The benzene containing thiophene withdrawn from the top of the secondary rectifying column 6 of the extractant returns to the extractive distillation column 4, and the bottom material of the column enters the secondary regenerating column 7 of the extractant; the material withdrawn from the top of the secondary regenerating column 7 of the extractant enters the thiophene refining column 8, and finally, thiophene is discharged through the thiophene finished product diversion pipe 9. The above is the entire usage process of this equipment.

[0029] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0030] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An equipment for purifying thiophene by azeotropic distillation of crude benzene, characterized in that: It includes an installation plate (1), and a primary distillation column (2), a benzene fraction column (3), an extractive distillation column (4), an extractant regeneration column (5), an extractive secondary distillation column (6), an extractant secondary regeneration column (7), and a thiophene refining column (8) are fixedly connected to the upper surface of the installation plate (1) respectively. A crude benzene tank area connecting pipe (10) is fixedly communicated with the right side surface of the primary distillation column (2), and a thiophene finished product drainage pipe (9) is fixedly communicated with the left side surface of the thiophene refining column (8). A hydrogenation feed buffer tank (19) is fixedly communicated with the back surface of the primary distillation column (2), a benzene fraction assembly (20) is fixedly communicated with the back surface of the benzene fraction column (3), and a hydrogenation device (23) is fixedly communicated with the back surface of the benzene fraction column (3). A benzene to hydrogenation system (21) is fixedly communicated with the back surface of the extractive distillation column (4), and an extractant recycling assembly (22) is fixedly communicated with the back surface of the extractant regeneration column (5). The primary distillation column (2) is fixedly communicated with the benzene fraction column (3) through a first conduit. The benzene fraction assembly (20) is fixedly communicated with the extractive distillation column (4) and the extractive secondary distillation column (6) through a three-way pipe. The extractive distillation column (4) is fixedly communicated with the extractant regeneration column (5) through a second conduit. The extractant regeneration column (5) is fixedly communicated with the extractive distillation column (4) through a third conduit. The extractant regeneration column (5) is fixedly communicated with the extractive secondary distillation column (6) through a fourth conduit. The extractive secondary distillation column (6) is fixedly communicated with the extractant secondary regeneration column (7) through a fifth conduit. The extractant secondary regeneration column (7) is fixedly communicated with the extractive secondary distillation column (6) through a sixth conduit. The extractant secondary regeneration column (7) is fixedly communicated with the thiophene refining column (8) through a seventh conduit.

2. The azeotropic distillation purification equipment for thiophene in crude benzene according to claim 1, wherein: An anticorrosion pad (17) is fixedly connected to the bottom surface of the installation plate (1), and the anticorrosion pad (17) is made of rubber material.

3. A thiophene purification device for crude benzene azeotropic distillation according to claim 1, characterized in that: A set of installation holes (15) are formed on the upper surface of the installation plate (1), and a set of installation screws (16) are arranged outside the installation plate (1).

4. A thiophene purification device for the azeotropic distillation of crude benzene according to claim 1, characterized in that: A control display screen (14) is fixedly connected to the upper surface of the installation plate (1), and an anticorrosion layer is sprayed on the outer surface of the installation plate (1).

5. A thiophene purification device for crude benzene azeotropic distillation according to claim 1, characterized in that: A controller (12) is fixedly connected to the upper surface of the installation plate (1), and the installation plate (1) is made of steel.

6. The azeotropic distillation purification equipment for thiophene in crude benzene according to claim 1, characterized in that: A nameplate (13) is fixedly connected to the upper surface of the installation plate (1), and a waterproof layer is sprayed on the outer surface of the nameplate (13).

7. A thiophene purification device for the azeotropic distillation of crude benzene according to claim 1, characterized in that: Two reinforcing blocks (11) are fixedly connected to the outer surfaces of the primary distillation column (2), the benzene fraction column (3), the extractive distillation column (4), the extractant regeneration column (5), the extractive secondary distillation column (6), the extractant secondary regeneration column (7), and the thiophene refining column (8) together. The bottom surface of each reinforcing block (11) is fixedly connected to the upper surface of the installation plate (1).

8. A thiophene purification device for crude benzene azeotropic distillation according to claim 1, characterized in that: Observation windows (18) are fixedly inlaid on the outer surfaces of the said debutanizer (2), benzene fractionation column (3), extractive distillation column (4), extractant regeneration column (5), secondary extractive distillation column (6), secondary extractant regeneration column (7) and thiophene refining column (8), and the said observation windows (18) are made of toughened glass.

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