Crude benzene hydrogenation device after removal of thiophene and carbon disulfide

Abstract

The hydrogenation device for crude benzene after thiophene and carbon disulfide removal comprises a coking benzene device, a thiophene device and a benzene hydrogenation device, the coking benzene device comprises a coking benzene storage tank, a channel pipeline on the coking benzene storage tank is connected with a primary distillation tower, one side of the top of the primary distillation tower is connected with a carbon disulfide separation pipeline, and the other side of the top of the primary distillation tower is connected with a benzene hydrogenation device. The other end of the carbon disulfide separation pipeline is connected to a carbon disulfide processing device, the bottom end of the carbon disulfide processing device is connected with a channel pipeline, the channel pipeline is sequentially connected with a recycling device and a carbon disulfide storage tank, one part of the recycling device is connected with a recycling pipeline, and the other end of the recycling pipeline is connected with a primary distillation tower; the device can be used for producing various products, improving the added value of the products, reducing the energy consumption in the production process, enhancing the processing capacity of the benzene hydrogenation device and improving the production efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production equipment, in particular to a crude benzene hydrogenation device after thiophene and carbon disulfide are removed. Background Art

[0002] The crude benzene hydrogenation process is that the coking benzene enters the benzene hydrogenation unit from the tank area for hydrogenation treatment. The traditional hydrogenation unit cannot completely remove impurities during the benzene hydrogenation process, resulting in unstable product purity and quality, and increased production costs; the traditional benzene hydrogenation unit will produce a large amount of waste water and waste gas, and some organic sulfur will generate acid gas and acid water, causing pollution to the environment; and a large amount of hydrogen is required in the hydrogenation process, resulting in relatively large energy consumption, which does not meet the requirements of energy conservation and emission reduction, and the production line products are single and the ability to resist market risks is poor.

[0003] Therefore, there is an urgent need for a crude benzene hydrogenation device after removing thiophene and carbon disulfide, which can produce a variety of products, increase product added value, reduce energy consumption in the production process, enhance the processing capacity of the benzene hydrogenation device, and improve production efficiency. Summary of the invention

[0004] A crude benzene hydrogenation device after removing thiophene and carbon disulfide can produce a variety of products, increase product added value, reduce energy consumption in the production process, enhance the processing capacity of the benzene hydrogenation device, and improve production efficiency.

[0005] A crude benzene hydrogenation unit after removing thiophene and carbon disulfide comprises a coking benzene unit, a thiophene unit and a benzene hydrogenation unit, wherein:

[0006] The coking benzene device comprises a coking benzene storage tank, a channel pipeline on the coking benzene storage tank is connected to a primary distillation tower, one side of the top of the primary distillation tower is connected to a carbon disulfide separation pipeline, a group of branch pipelines are arranged at the other end of the carbon disulfide separation pipeline, and a group of branch pipelines are connected to a carbon disulfide processing device, a channel pipeline is connected to the bottom end of the carbon disulfide processing device, and the channel pipeline is sequentially connected to a refining device and a carbon disulfide storage tank, a point of the refining device is connected to a recovery pipeline, and the other end of the recovery pipeline is connected to the primary distillation tower;

[0007] The channel pipeline at the bottom end of the primary distillation tower is connected to the benzene distillation tower, and the top of the benzene distillation tower is provided with a thiophene device pipeline, and the thiophene device pipeline is connected to the thiophene device;

[0008] A benzene hydrogenation device pipeline is provided at the bottom end of the benzene fraction tower, and the benzene hydrogenation device pipeline is connected to the benzene hydrogenation device.

[0009] Preferably, the thiophene device comprises an extractive distillation tower, and the thiophene device pipeline is connected to the extractive distillation tower, a distillation tower transport pipeline is provided at the bottom of the extractive distillation tower, and the other end of the distillation tower transport pipeline is connected to the extractant regeneration tower, and a regeneration tower transport pipeline is provided at the top of the extractant regeneration tower, and the other end of the regeneration tower transport pipeline is connected to a secondary extractive distillation tower, a benzene reflux pipeline is provided at the top of the secondary extractive distillation tower, and the other end of the benzene reflux pipeline is connected to the benzene fraction tower, a secondary extractive distillation tower transport pipeline is provided at the bottom of the secondary extractive distillation tower, and the other end of the secondary extractive distillation tower transport pipeline is connected to the secondary extractant regeneration tower, a secondary extractant regeneration tower transport pipeline is provided on the secondary extractant regeneration tower, and the other end of the secondary extractant regeneration tower transport pipeline is connected to the thiophene refining tower, and the channel pipeline at the top of the thiophene refining tower is connected to the thiophene finished product storage tank.

[0010] Preferably, the benzene hydrogenation unit includes a deweighting tower, the benzene hydrogenation unit pipeline is connected to the deweighting tower, the top channel pipeline of the deweighting tower is connected to the pre-hydrogenation reactor, the bottom channel pipeline of the pre-hydrogenation reactor is connected to the main hydrogenation reactor, the bottom end of the main hydrogenation reactor is provided with a reactor pipeline, the other end of the reactor pipeline is connected to an extraction tower, the bottom end of the extraction tower is connected to the extraction tower pipeline, the other end of the extraction tower pipeline is connected to a triphenyl tower, the triphenyl tower is provided with a product output pipeline, and the product output pipeline is sequentially connected to a pure benzene product tank, a mixed benzene product tank and a xylene product tank.

[0011] Preferably, the bottom of the extractant regeneration tower is connected to a first solvent circulation line, and the other end of the first solvent circulation line is connected to an extractive distillation tower; the bottom end of the secondary extractant regeneration tower is connected to a second solvent circulation line, and the other end of the second solvent circulation line is connected to a secondary extractive distillation tower.

[0012] Preferably, the extractive distillation tower, the extractant regeneration tower, the secondary extractive distillation tower, the secondary extractant regeneration tower and the thiophene refining tower are all provided with a heating device at the bottom and a cooling device at the top.

[0013] Preferably, a heavy benzene output pipeline is provided at the bottom of the deheavy tower, and the heavy benzene output pipeline is connected to a heavy benzene detarring device.

[0014] Preferably, the tops of the deweighting tower, the extraction tower and the triphenyl tower are all provided with cooling devices, and the top of the extraction tower outputs non-aromatic products.

[0015] Beneficial effects of the utility model: The utility model is a crude benzene hydrogenation device after removing thiophene and carbon disulfide. After the coked benzene in the coked benzene storage tank of the device enters the thiophene device, thiophene, carbon disulfide and other components are first extracted through the extraction distillation tower, and then enters the benzene hydrogenation device for hydrogenation and extraction distillation to produce pure benzene, mixed benzene, xylene, non-aromatic hydrocarbons, heavy benzene products and other processes. Coked benzene is first extracted with thiophene and carbon disulfide products through extraction distillation, which improves the added value of the product, diversifies the product, and increases the market price competitiveness. The generation of acid gas and acid water is reduced through the reflux pipeline, which solves the environmental pressure. The process of first extracting thiophene from crude benzene and then hydrogenating it combines the extraction and hydrogenation processes, which can not only recover high-value-added thiophene, but also reduce the total sulfur of crude benzene, improve the processing capacity of the benzene hydrogenation device, improve the efficiency and production capacity of the process, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a crude benzene hydrogenation device after removing thiophene and carbon disulfide according to the utility model;

[0017] Figure 2 It is a schematic diagram of a thiophene unit of a crude benzene hydrogenation unit after removing thiophene and carbon disulfide according to the utility model;

[0018] Figure 3 The utility model is a schematic diagram of a benzene hydrogenation device of a crude benzene hydrogenation device after thiophene and carbon disulfide are removed.

[0019] In the figure:

[0020] Coking benzene device 100, coking benzene storage tank 101, primary distillation tower 102, carbon disulfide separation pipeline 103, carbon disulfide processing device 104, recycling device 105, carbon disulfide storage tank 106, recovery pipeline 107, benzene fractionation tower 108, thiophene device pipeline 109, benzene hydrogenation device pipeline 110;

[0021] Thiophene device 200, extractive distillation tower 201, distillation tower transport pipeline 202, extractant regeneration tower 203, regeneration tower transport pipeline 204, secondary extractive distillation tower 205, benzene reflux pipeline 206, secondary extractive distillation tower transport pipeline 207, secondary extractant regeneration tower 208, thiophene refining tower 209, thiophene finished product storage tank 210, secondary extractant regeneration tower transport pipeline 211, first solvent circulation line 212, second solvent circulation line 213;

[0022] Benzene hydrogenation unit 300, deweighting tower 301, pre-hydrogenation reactor 302, main hydrogenation reactor 303, reactor pipeline 304, extraction tower 305, pipeline to extraction tower 306, triphenyl tower 307, product output pipeline 308, pure benzene product tank 309, mixed benzene product tank 310, xylene product tank 311, heavy benzene output pipeline 312, heavy benzene detarring unit 313. DETAILED DESCRIPTION

[0023] In order to make the technical solution of the present utility model easier to understand, the technical solution of the present utility model is now clearly and completely described in the form of specific embodiments in combination with the accompanying drawings.

[0024] Embodiment 1:

[0025] like Figure 1-3 As shown, the utility model is a crude benzene hydrogenation device after removing thiophene and carbon disulfide, comprising a coking benzene device 100, a thiophene device 200 and a benzene hydrogenation device 300, wherein:

[0026] The coking benzene device 100 includes a coking benzene storage tank 101, a channel pipeline on the coking benzene storage tank 101 is connected to a primary distillation tower 102, one side of the top of the primary distillation tower 102 is connected to a carbon disulfide separation pipeline 103, a group of branch pipelines are arranged at the other end of the carbon disulfide separation pipeline 103, and a group of branch pipelines are connected to a carbon disulfide processing device 104, the bottom end of the carbon disulfide processing device 104 is connected to a channel pipeline, and the channel pipeline is sequentially connected to a refining device 105 and a carbon disulfide storage tank 106, the refining device 105 is connected to a recovery pipeline 107 at one end, and the other end of the recovery pipeline 107 is connected to the primary distillation tower 102;

[0027] The channel pipeline at the bottom end of the primary distillation tower 102 is connected to the benzene fraction tower 108, and the top of the benzene fraction tower 108 is provided with a thiophene device pipeline 109, and the thiophene device pipeline 109 is connected to the thiophene device 200;

[0028] A benzene hydrogenation pipeline 110 is provided at the bottom of the benzene fraction tower 108 , and the benzene hydrogenation pipeline 110 is connected to the benzene hydrogenation device 300 .

[0029] The thiophene device 200 includes an extractive distillation tower 201, and the thiophene device pipeline 109 is connected to the extractive distillation tower 201. The extractive distillation tower 201 is provided with a distillation tower transport pipeline 202 at the bottom, and the other end of the distillation tower transport pipeline 202 is connected to the extractant regeneration tower 203. The top of the extractant regeneration tower 203 is provided with a regeneration tower transport pipeline 204, and the other end of the regeneration tower transport pipeline 204 is connected to a secondary extractive distillation tower 205. The top of the secondary extractive distillation tower 205 is provided with a benzene reflux pipeline 206. The other end of line 206 is connected to the benzene fraction tower 108, and a secondary extractive distillation tower transport pipeline 207 is provided at the bottom of the secondary extractive distillation tower 205, and the other end of the secondary extractive distillation tower transport pipeline 207 is connected to the secondary extractant regeneration tower 208, and a secondary extractant regeneration tower transport pipeline 211 is provided on the secondary extractant regeneration tower 208, and the other end of the secondary extractant regeneration tower transport pipeline 211 is connected to the thiophene refining tower 209, and the channel pipeline at the top of the thiophene refining tower 209 is connected to the thiophene finished product storage tank 210.

[0030] The benzene hydrogenation device 300 includes a deweighting tower 301, a benzene hydrogenation device pipeline 110 is connected to the deweighting tower 301, a top channel pipeline of the deweighting tower 301 is connected to a pre-hydrogenation reactor 302, a bottom channel pipeline of the pre-hydrogenation reactor 302 is connected to a main hydrogenation reactor 303, a reactor pipeline 304 is provided at the bottom of the main hydrogenation reactor 303, the other end of the reactor pipeline 304 is connected to an extraction tower 305, the bottom end of the extraction tower 305 is connected to an extraction tower pipeline 306, the other end of the extraction tower pipeline 306 is connected to a triphenyl tower 307, a product output pipeline 308 is provided on the triphenyl tower 307, and the product output pipeline 308 is connected to a pure benzene product tank 309, a mixed benzene product tank 310 and a xylene product tank 311 in sequence.

[0031] Embodiment 2:

[0032] like Figure 1-3 As shown, the utility model is a crude benzene hydrogenation device after removing thiophene and carbon disulfide, wherein:

[0033] The bottom of the extractant regeneration tower 203 is connected to the first solvent circulation line 212, and the other end of the first solvent circulation line 212 is connected to the extractive distillation tower 201; the bottom of the secondary extractant regeneration tower 208 is connected to the second solvent circulation line 213, and the other end of the second solvent circulation line 213 is connected to the secondary extractive distillation tower 205.

[0034] The extractive distillation tower 201, the extractant regeneration tower 203, the secondary extractive distillation tower 205, the secondary extractant regeneration tower 208 and the thiophene refining tower 209 are all provided with heating devices at the bottom and cooling devices at the top.

[0035] A heavy benzene output pipeline 312 is provided at the bottom of the de-heavy tower 301 , and the heavy benzene output pipeline 312 is connected to a heavy benzene detarring device 313 .

[0036] The deweighting tower 301, the extraction tower 305, and the triphenyl tower 307 are all provided with cooling devices at the top, and the extraction tower 305 outputs non-aromatic products at the top.

[0037] When the device is in use, the coking benzene enters the primary distillation tower 102 from the coking benzene device 100, enters the carbon disulfide processing device 104 through the carbon disulfide separation pipeline 103 on the primary distillation tower 102, and enters the refining device 105 after the cyclopentadiene and light benzene separated by the carbon disulfide processing device 104 and returns to the primary distillation tower 102 again, and the separated carbon disulfide enters the carbon disulfide storage tank 106; at the same time, the coking benzene after preliminary processing enters the thiophene device 200 from the benzene fractionation tower 108 for cyclic processing, and the thiophene product is produced and enters the thiophene finished product storage tank 210;

[0038] The coking benzene enters the thiophene device 200, and the material enters the extractive distillation tower 201. Through extractive distillation, the output material is transported to the extractant regeneration tower 203 from the bottom of the extractive distillation tower 201. Then, the material is transported from the top of the extractant regeneration tower 203 to the secondary extractive distillation tower 205. The top of the secondary extractive distillation tower 205 is provided with a benzene reflux pipeline 206, which is connected to the benzene fraction tower 108. The logistics at the bottom of the secondary extractive distillation tower 205 is transported to the secondary extractant regeneration tower, and the secondary extractant regeneration tower 208 is then connected to the thiophene extractive distillation tower 208. The channel pipeline at the top of the thiophene refining tower 209 is connected to the thiophene finished product storage tank 210. The light fraction components such as carbon disulfide produced after dehydrogenation are returned to the benzene hydrogenation device 300 for processing. The material is then transported to the deweighting tower 301 and the pre-hydrogenation reactor 302. After reaching the main hydrogenation reactor 303, it reaches the extraction tower 305 and is transported to the triphenyl tower 307. Finally, the pure benzene product, mixed benzene product and xylene product are produced and enter the pure benzene product tank 309, the mixed benzene product tank 310 and the xylene product tank 311 respectively.

[0039] This device separates thiophene and carbon disulfide, sulfur compounds in crude benzene, into industrial products, removes 90% of the sulfides in crude benzene, greatly reduces the hydrogen consumption of the crude benzene hydrogenation device, reduces the hydrogen circulation volume of the hydrogen circulation compressor, and reduces the power consumption of the hydrogen circulation compressor. Since most of the materials of the crude benzene thiophene extraction device directly enter the benzene hydrogenation device 300, the evaporation amount of the deweighting tower 301 is reduced, saving heat.

[0040] It should be noted that the embodiments described herein are only partial embodiments of the present invention, rather than all implementations of the present invention, and the embodiments are only exemplary, and their role is only to provide a more intuitive and clear way to understand the content of the present invention, rather than to limit the technical solutions described in the present invention. Without departing from the concept of the present invention, all other implementation methods that ordinary technicians in the field can think of without creative work, and other simple replacements and various changes to the technical solutions of the present invention, all belong to the protection scope of the present invention.

Claims

1. A crude benzene hydrogenation device after removing thiophene and carbon disulfide, characterized in that: The invention comprises a coking benzene unit (100), a thiophene unit (200) and a benzene hydrogenation unit (300), wherein: The coking benzene device (100) comprises a coking benzene storage tank (101), a channel pipeline on the coking benzene storage tank (101) is connected to a primary distillation tower (102), one side of the top of the primary distillation tower (102) is connected to a carbon disulfide separation pipeline (103), a group of branch pipelines are arranged at the other end of the carbon disulfide separation pipeline (103), and the group of branch pipelines are connected to a carbon disulfide processing device (104), the bottom end of the carbon disulfide processing device (104) is connected to a channel pipeline, and the channel pipeline is sequentially connected to a recycling device (105) and a carbon disulfide storage tank (106), one end of the recycling device (105) is connected to a recovery pipeline (107), and the other end of the recovery pipeline (107) is connected to the primary distillation tower (102); The channel pipeline at the bottom end of the primary distillation tower (102) is connected to the benzene fraction tower (108), and the top of the benzene fraction tower (108) is provided with a thiophene device pipeline (109), and the thiophene device pipeline (109) is connected to the thiophene device (200); A benzene hydrogenation unit pipeline (110) is provided at the bottom end of the benzene fraction tower (108), and the benzene hydrogenation unit pipeline (110) is connected to the benzene hydrogenation unit (300).

2. A crude benzene hydrogenation device after removing thiophene and carbon disulfide as claimed in claim 1, characterized in that: The thiophene device (200) comprises an extractive distillation tower (201), a thiophene device pipeline (109) is connected to the extractive distillation tower (201), a distillation tower transport pipeline (202) is provided at the bottom of the extractive distillation tower (201), the other end of the distillation tower transport pipeline (202) is connected to an extractant regeneration tower (203), a regeneration tower transport pipeline (204) is provided at the top of the extractant regeneration tower (203), the other end of the regeneration tower transport pipeline (204) is connected to a secondary extractive distillation tower (205), a benzene reflux pipeline (206) is provided at the top of the secondary extractive distillation tower (205), and the benzene reflux pipeline (206) is provided at the top of the secondary extractive distillation tower (205). The other end of the flow pipeline (206) is connected to the benzene fraction tower (108). A secondary extractive distillation tower transport pipeline (207) is provided at the bottom of the secondary extractive distillation tower (205). The other end of the secondary extractive distillation tower transport pipeline (207) is connected to a secondary extractant regeneration tower (208). A secondary extractant regeneration tower transport pipeline (211) is provided on the secondary extractant regeneration tower (208). The other end of the secondary extractant regeneration tower transport pipeline (211) is connected to a thiophene refining tower (209). The channel pipeline at the top of the thiophene refining tower (209) is connected to a thiophene finished product storage tank (210).

3. A crude benzene hydrogenation device after removing thiophene and carbon disulfide as claimed in claim 1, characterized in that: The benzene hydrogenation device (300) comprises a deweighting tower (301), a benzene hydrogenation device pipeline (110) is connected to the deweighting tower (301), a top channel pipeline of the deweighting tower (301) is connected to a pre-hydrogenation reactor (302), a bottom channel pipeline of the pre-hydrogenation reactor (302) is connected to a main hydrogenation reactor (303), a reactor pipeline (304) is provided at the bottom end of the main hydrogenation reactor (303), the other end of the reactor pipeline (304) is connected to an extraction tower (305), the bottom end of the extraction tower (305) is connected to an extraction tower pipeline (306), the other end of the extraction tower pipeline (306) is connected to a triphenyl tower (307), a product output pipeline (308) is provided on the triphenyl tower (307), and the product output pipeline (308) is connected to a pure benzene product tank (309), a mixed benzene product tank (310) and a xylene product tank (311) in sequence.

4. A crude benzene hydrogenation device after removing thiophene and carbon disulfide as claimed in claim 2, characterized in that: The bottom of the extractant regeneration tower (203) is connected to the first solvent circulation line (212), and the other end of the first solvent circulation line (212) is connected to the extractive distillation tower (201); the bottom of the secondary extractant regeneration tower (208) is connected to the second solvent circulation line (213), and the other end of the second solvent circulation line (213) is connected to the secondary extractive distillation tower (205).

5. A crude benzene hydrogenation device after removing thiophene and carbon disulfide as claimed in claim 2, characterized in that: The extractive distillation tower (201), the extractant regeneration tower (203), the secondary extractive distillation tower (205), the secondary extractant regeneration tower (208) and the thiophene refining tower (209) are all provided with heating devices at the bottom and cooling devices at the top.

6. A crude benzene hydrogenation device after removing thiophene and carbon disulfide as claimed in claim 3, characterized in that: A heavy benzene output pipeline (312) is provided at the bottom of the de-heavy tower (301), and the heavy benzene output pipeline (312) is connected to a heavy benzene detarring device (313).

7. A crude benzene hydrogenation device after removing thiophene and carbon disulfide as claimed in claim 3, characterized in that: The tops of the deweighting tower (301), the extraction tower (305) and the triphenyl tower (307) are all provided with circulating cooling devices, and the top of the extraction tower (305) outputs non-aromatic products.

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