System for preparing alkane chemicals from medium-temperature coal tar

Abstract

The utility model relates to the technical field of chemical industry, and discloses a system for preparing alkane chemicals from medium-temperature coal tar, which comprises a delayed coking device, a first fractionation device, a hydrofining device, a second fractionation device, an adsorption separation device, a first rectification device, a hydrodewaxing device, a fixed bed decolorization device and a second rectification device which are connected in sequence, the medium-temperature coal tar is input into a delayed coking device and is subjected to follow-up treatment, a first component and a second component are output after passing through a first rectification device, the first component is a solvent oil component for paint and cleaning, and the second component is a mixed component of transformer oil and rubber plasticizer naphthenic mineral oil; and inputting the second component into a hydrodewaxing device, carrying out subsequent treatment, and outputting the separated transformer oil and rubber plasticizer naphthenic mineral oil after passing through a second rectification device. According to the system, the solvent oil for paint and cleaning, the transformer oil and the rubber plasticizer naphthenic mineral oil are obtained at the same time, and the additional value of the medium-temperature coal tar is increased.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, specifically to a system for producing alkane chemicals from medium-temperature coal tar. Background Technology

[0002] The existing production processes for solvent oils used in paints and cleaning products generally involve the following steps: Fischer-Tropsch synthesis, hydrorefining, isomerization pour point depressing, and clay refining. Isomerization pour point depressing can be replaced by hydrodearomatization. The existing production processes for transformer oils generally involve the following steps: solvent refining, hydrorefining, and molecular sieve dewaxing. Hydrorefining can be replaced by solvent refining. The existing production processes for naphthenic mineral oils used as rubber plasticizers generally involve the following steps: hydrotreatment, hydrodepthening, and supplementary refining. Alternatively, hydrodeacidification and furfural refining can be used, or high-pressure hydrotreatment and furfural refining can be employed. These methods of obtaining solvent oils for paints and cleaning products, transformer oils, and naphthenic mineral oils as rubber plasticizers require separate processing systems, resulting in relatively complex and costly overall processes. Utility Model Content

[0003] In view of this, the present invention provides a system for producing alkane chemicals from medium-temperature coal tar, in order to solve the problem that the existing methods for obtaining solvent oil for paint and cleaning, transformer oil and cycloalkyl mineral oil for rubber plasticizers are all processed separately using different processing systems, resulting in a relatively complex overall process and high cost.

[0004] This utility model provides a system for producing alkane chemicals from medium-temperature coal tar, comprising:

[0005] Delayed coking unit is suitable for processing medium-temperature coal tar and outputting coking oil and gas;

[0006] A first fractionation unit is connected to the delayed coking unit. The first fractionation unit is adapted to process the coking oil and gas output from the delayed coking unit and output a mixed distillate oil.

[0007] A hydrorefining unit is connected to the first fractionating unit, and the hydrorefining unit is adapted to process the mixed distillate oil output from the first fractionating unit to output hydrorefined oil.

[0008] The second fractionation unit is connected to the hydrorefining unit and is adapted to process the hydrorefined oil output from the hydrorefining unit to output naphtha fraction.

[0009] An adsorption separation device connected with the second fractionating device, the adsorption separation device being adapted to process the naphtha fraction output by the second fractionating device, and output separated aromatic hydrocarbon components and alkane components;

[0010] A first fractionating device connected with the adsorption separation device, the first fractionating device being adapted to process the aromatic hydrocarbon components output by the adsorption separation device, and output a first component which is a paint and cleaning solvent oil component, and process the alkane components output by the adsorption separation device, and output a second component which is a mixed component of transformer oil and rubber plasticizer naphthenic mineral oil;

[0011] A hydrogenation condensation point reduction device connected with the first fractionating device, the hydrogenation condensation point reduction device being adapted to reduce the condensation point of the second component output by the first fractionating device;

[0012] A fixed bed decoloring device connected with the hydrogenation condensation point reduction device, the fixed bed decoloring device being adapted to decolor the output of the hydrogenation condensation point reduction device;

[0013] A second fractionating device connected with the fixed bed decoloring device, the second fractionating device being adapted to process the output of the fixed bed decoloring device, and output separated transformer oil and rubber plasticizer naphthenic mineral oil. The application adopts the technical solution above, realizes the fractional utilization of medium-temperature coal tar through a system, realizes the simultaneous production of paint and cleaning solvent oil, transformer oil and rubber plasticizer naphthenic mineral oil, improves the added value of medium-temperature coal tar products, and the process is relatively simple and has a low cost. The technical solution of the application fully utilizes the full fraction of medium-temperature coal tar, realizes the maximum utilization of medium-temperature coal tar, and has a good application prospect.

[0014] Optionally, the application further comprises:

[0015] A third fractionating device connected with the first fractionating device, the third fractionating device being adapted to process the first component output by the first fractionating device, and output separated No. 1 paint and cleaning solvent oil component, No. 2 paint and cleaning solvent oil component, No. 3 paint and cleaning solvent oil component, No. 4 paint and cleaning solvent oil component and No. 5 paint and cleaning solvent oil component. The application adopts the technical solution above, and further improves the added value of medium-temperature coal tar products.

[0016] Optionally, the second fractionating device is further adapted to output tail oil.

[0017] Optionally, the application further comprises:

[0018] A hydrocracking device is connected with the second fractionating device, and the hydrocracking device is suitable for processing tail oil output by the second fractionating device to obtain hydrocracking oil, and the hydrocracking oil is mixed with hydrorefined oil output by the hydrorefining device and then is re-delivered into the second fractionating device, so that the tail oil output by the second fractionating device is fully utilized and the production cost is reduced.

[0019] Optionally, the first fractionating device is also suitable for outputting bottoming oil.

[0020] Optionally, the first fractionating device is also suitable for mixing the output bottoming oil with the medium-temperature coal tar and then re-delivering the mixture into the delayed coking device, so that the bottoming oil output by the first fractionating device is fully utilized and the production cost is reduced.

[0021] Optionally, the delayed coking device is also suitable for outputting pitch coke, so that the added value of the medium-temperature coal tar product is improved.

[0022] Optionally, the first fractionating device is also suitable for outputting phenol oil, so that the added value of the medium-temperature coal tar product is improved.

[0023] Optionally, the second fractionating device is also suitable for outputting diesel oil fraction, so that the added value of the medium-temperature coal tar product is improved.

[0024] Optionally, the first fractionating device is also suitable for outputting heavy alkane component, so that high-added-value alkane chemicals are produced. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0026] Figure 1 The figure is a connection schematic diagram of the system for preparing alkane chemicals from medium-temperature coal tar provided in the embodiments of the present application.

[0027] Explanation of reference signs:

[0028] 1. Delayed coking unit; 2. First fractionation unit; 3. Hydrorefining unit; 4. Second fractionation unit; 5. Hydrocracking unit; 6. Adsorption separation unit; 7. First rectification unit; 8. Second rectification unit; 9. Hydrogenated pour point depressant unit; 10. Fixed bed decolorization unit; 11. Third rectification unit; 12. Coking oil and gas; 13. Pitch coke; 14. Phenolic oil; 15. Mixed distillate oil; 16. Bottom circulation oil; 17. Hydrorefined oil; 18. Naphtha fraction; 19. Diesel fraction; 20. Tailings Oil; 21. Aromatic components; 22. Alkane components; 23. Component 1; 24. Component 2; 25. Heavy alkane components; 26. No. 1 solvent oil component for paint and cleaning; 27. No. 2 solvent oil component for paint and cleaning; 28. No. 3 solvent oil component for paint and cleaning; 29. ​​No. 4 solvent oil component for paint and cleaning; 30. No. 5 solvent oil component for paint and cleaning; 31. Transformer oil; 32. Rubber plasticizer naphthenic mineral oil; 33. Medium-temperature coal tar; 34. Hydrocracked oil. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] like Figure 1 A specific embodiment of the system for producing alkane chemicals from medium-temperature coal tar, as shown, includes: a delayed coking unit 1, a first fractionation unit 2, a hydrorefining unit 3, a second fractionation unit 4, an adsorption separation unit 6, a first distillation unit 7, a hydrodecondensation unit 9, a fixed-bed decolorization unit 10, a second distillation unit 8, a third distillation unit 11, and a hydrocracking unit 5.

[0031] The delayed coking device 1 is suitable for treating the medium temperature coal tar 33, and outputs separated coking oil gas 12 and pitch coke 13; specifically, the delayed coking device 1 performs lightening treatment on the medium temperature coal tar 33, removes heavy components such as colloid pitch and mechanical impurities, and improves the liquid product yield. The first fractionating device 2 is connected with the delayed coking device 1, and the first fractionating device 2 is suitable for treating the coking oil gas 12 output by the delayed coking device 1, and outputs separated mixed distillate oil 15, bottom oil 16 and phenol oil 14; specifically, the first fractionating device 2 separates the oxygen-containing compounds in the coking oil gas 12, which are mainly phenolic compounds, and uses the oxygen-containing compounds as raw materials for phenol extraction and provides suitable raw materials for hydrofining. The hydrofining device 3 is connected with the first fractionating device 2, and the hydrofining device 3 is suitable for treating the mixed distillate oil 15 output by the first fractionating device 2, and outputs hydrorefined oil 17; specifically, the hydrofining device 3 removes the heteroatoms such as O, S and N and trace metal elements contained in the mixed distillate oil 15, and obtains the hydrorefined oil 17. The second fractionating device 4 is connected with the hydrofining device 3, and the second fractionating device 4 is suitable for treating the hydrorefined oil 17 output by the hydrofining device 3, and outputs separated naphtha fraction 18, tail oil 20 and diesel fraction 19; the hydrocracking device 5 is connected with the second fractionating device 4, and the hydrocracking device 5 is suitable for treating the tail oil 20 output by the second fractionating device 4, and obtains hydrocracking oil 34, and the hydrocracking oil 34 is mixed with the hydrorefined oil 17 output by the hydrofining device 3 and then re-delivered to the second fractionating device 4. That is, the hydrocracking device 5 performs lightening treatment on the tail oil 20 obtained by the second fractionating device 4, and obtains the hydrocracking oil 34, and the second fractionating device 4 separates the hydrorefined oil 17 and the hydrocracking oil 34 into the naphtha fraction 18, the diesel fraction 19 and the tail oil 20, which are used as raw materials for the adsorption separation device 6 and the hydrocracking device 5, respectively. The adsorption separation device 6 is connected with the second fractionating device 4, and the adsorption separation device 6 is suitable for treating the naphtha fraction 18 output by the second fractionating device 4, and outputs separated aromatic component 21 and alkane component 22. The first rectifying device 7 is connected with the adsorption separation device 6, and the first rectifying device 7 is suitable for treating the aromatic component 21 output by the adsorption separation device 6, and outputs first component 23, and treating the alkane component 22 output by the adsorption separation device 6, and outputs separated second component 24 and heavy alkane component 25, wherein the first component 23 is a solvent oil component for paint and cleaning, and the second component 24 is a mixed component of transformer oil and rubber plasticizer naphthenic mineral oil. The hydrodepressing device 9 is connected with the first rectifying device 7, and the hydrodepressing device 9 is suitable for reducing the condensation point of the second component 24 output by the first rectifying device 7.The fixed bed decoloring device 10 is connected with the hydrogenation decongealing device 9, and the fixed bed decoloring device 10 is suitable for decoloring the output of the hydrogenation decongealing device 9, so that the chroma meets the national standard. The second rectifying device 8 is connected with the fixed bed decoloring device 10, and the second rectifying device 8 is suitable for processing the output of the fixed bed decoloring device 10, and outputs separated transformer oil 31 and rubber plasticizer naphthenic mineral oil 32. The paint and cleaning solvent oil components, the transformer oil 31 and the rubber plasticizer naphthenic mineral oil 32 all belong to alkane chemicals.

[0032] Further, the third rectifying device 11 is connected with the first rectifying device 7, and the third rectifying device 11 is suitable for processing the first component 23 output by the first rectifying device 7, and outputs separated No. 1 paint and cleaning solvent oil component 26, No. 2 paint and cleaning solvent oil component 27, No. 3 paint and cleaning solvent oil component 28, No. 4 paint and cleaning solvent oil component 29 and No. 5 paint and cleaning solvent oil component 30. The first rectifying device 2 is also suitable for mixing the output bottom circulating oil 16 with the medium temperature coal tar 33 and then re-delivering them into the delayed coking device 1.

[0033] The main working process and principle of the system for preparing alkane chemicals from the medium temperature coal tar are as follows: the medium temperature coal tar 33 first enters the delayed coking device 1, and the heavy components thereof are converted into pitch coke 13, and the coking oil gas 12 enters the first rectifying device 2, and the phenol oil 14, mixed distillate oil 15 and bottom circulating oil 16 are separated; the bottom circulating oil 16 is mixed with the medium temperature coal tar 33 and then is used as the feed of the delayed coking device 1, the mixed distillate oil 15 enters the hydrofining device 3 for hydrofining treatment, and the hydrofining oil 17 is obtained and is used as the feed oil of the second rectifying device 4, and the hydrofining oil 17 is separated into naphtha fraction 18, diesel fraction 19 and tail oil 20 in the second rectifying device 4; the tail oil 20 enters the hydrocracking device 5 for hydrocracking treatment, and the hydrocracking oil 34 is obtained, and the hydrocracking oil 34 is mixed with the hydrofining oil 17 and then enters the second rectifying device 4; the naphtha fraction 18 enters the adsorption separation device 6, and the aromatic component 21 and the alkane component are obtained and are used as the feeds of the first rectifying device 7, and after treatment, the first component 23 and the second component 24 are separated, the first component 23 enters the third rectifying device 11, and No. 1 paint and cleaning solvent oil component 26, No. 2 paint and cleaning solvent oil component 27, No. 3 paint and cleaning solvent oil component 28, No. 4 paint and cleaning solvent oil component 29 and No. 5 paint and cleaning solvent oil component 30 are separated; the second component 24 enters the hydrogenation decongealing device 9, and the second component 24 after hydrogenation decongealing is obtained; the second component 24 after hydrogenation decongealing enters the fixed bed decoloring device 10, and the second component 24 after decoloring is obtained; the second component 24 after decoloring enters the second rectifying device 8, and the transformer oil 31 and the rubber plasticizer naphthenic mineral oil 32 are obtained.

[0034] The system for preparing alkane chemical products from medium-temperature coal tar has short technological process, low investment, high processing capacity, low energy consumption and significant economic benefits, through a series of process treatments, the medium-temperature coal tar 33 is graded utilized, high value-added products are produced, and the added value of the medium-temperature coal tar 33 is improved.

[0035] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A system for the production of alkanes chemicals from medium temperature coal tar, characterized by, The system comprises: a delayed coking device (1) adapted to process medium temperature coal tar (33) and output coking oil gas (12); a first fractionating device (2) connected with the delayed coking device (1), the first fractionating device (2) being adapted to process the coking oil gas (12) output by the delayed coking device (1) and output mixed distillate oil (15); a hydrofining device (3) connected with the first fractionating device (2), the hydrofining device (3) being adapted to process the mixed distillate oil (15) output by the first fractionating device (2) and output hydrofining oil (17); a second fractionating device (4) connected with the hydrofining device (3), the second fractionating device (4) being adapted to process the hydrofining oil (17) output by the hydrofining device (3) and output naphtha fraction (18); an adsorptive separation device (6) connected with the second fractionating device (4), the adsorptive separation device (6) being adapted to process the naphtha fraction (18) output by the second fractionating device (4) and output separated aromatic component (21) and alkane component (22); a first rectifying device (7) connected with the adsorptive separation device (6), the first rectifying device (7) being adapted to process the aromatic component (21) output by the adsorptive separation device (6) and output first component (23), and process the alkane component (22) output by the adsorptive separation device (6) and output second component (24), the first component (23) being paint and cleaning solvent oil component, and the second component (24) being mixed component of transformer oil and rubber plasticizer naphthenic mineral oil; a hydrogenation condensation device (9) connected with the first rectifying device (7), the hydrogenation condensation device (9) being adapted to reduce the condensation point of the second component (24) output by the first rectifying device (7); a fixed bed decoloring device (10) connected with the hydrogenation condensation device (9), the fixed bed decoloring device (10) being adapted to decolor the output of the hydrogenation condensation device (9); a second rectifying device (8) connected with the fixed bed decoloring device (10), the second rectifying device (8) being adapted to process the output of the fixed bed decoloring device (10) and output separated transformer oil (31) and rubber plasticizer naphthenic mineral oil (32).

2. The system for making alkanes chemicals from medium temperature coal tar according to claim 1, wherein, Further comprising: a third rectifying device (11) connected with the first rectifying device (7), the third rectifying device (11) being adapted to process the first component (23) output by the first rectifying device (7) and output separated No. 1 paint and cleaning solvent oil component (26), No. 2 paint and cleaning solvent oil component (27), No. 3 paint and cleaning solvent oil component (28), No. 4 paint and cleaning solvent oil component (29) and No. 5 paint and cleaning solvent oil component (30).

3. The system for making alkanes chemicals from medium temperature coal tar according to claim 1 or 2, characterized in that, The second fractionating device (4) is further adapted to output tail oil (20).

4. The system for making alkanes chemicals from medium temperature coal tar according to claim 3, wherein, Further comprising: A hydrocracking device (5) is connected to the second fractionating device (4), and the hydrocracking device (5) is adapted to process tail oil (20) output from the second fractionating device (4) to obtain hydrocracking oil (34), and the hydrocracking oil (34) is mixed with hydrorefined oil (17) output from the hydrorefining device (3) and then re-fed into the second fractionating device (4).

5. The system for making alkanes chemicals from medium temperature coal tar according to claim 1 or 2, wherein, The first fractionating device (2) is also adapted to output bottom cycle oil (16).

6. The system for making alkanes chemicals from medium temperature coal tar according to claim 5, wherein, The first fractionating device (2) is also adapted to mix the output bottom cycle oil (16) with the medium-temperature coal tar (33) and then re-feed into the delayed coking device (1).

7. The system for making alkanes chemicals from medium temperature coal tar according to claim 4 or 6, characterized in that, The delayed coking device (1) is also adapted to output pitch coke (13).

8. The system for making alkanes chemicals from medium temperature coal tar according to claim 4 or 6, wherein, The first fractionating device (2) is also adapted to output phenol oil (14).

9. The system for making alkanes chemicals from medium temperature coal tar according to claim 4 or 6, wherein, The second fractionating device (4) is also adapted to output diesel oil fraction (19).

10. The system for making alkanes chemicals from medium temperature coal tar according to claim 4 or 6, wherein, The first fractionating device (7) is also adapted to output heavy alkane component (25).

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