Hydrofining device for producing isohexane

Abstract

The utility model discloses a hydrofining device for producing isohexane, and relates to the technical field of chemical equipment. The recycle hydrogen utilization unit comprises a recycle hydrogen desulfurization reaction tank, a compressor connected with an inlet of the recycle hydrogen desulfurization reaction tank, a compressor inlet connected with a hydrogen outlet of the recycle hydrogen liquid separation tank through a pipeline, a hydrogen supplementing pipeline connected with an inlet of the compressor, and a filter connected between an outlet of the recycle hydrogen desulfurization reaction tank and a hydrogen adding port of the hydrogenation reactor; a feeding hole is formed in the top of the hydrogenation reactor. The hydrogen cooler has the advantages that hydrogen flows upwards along the spiral groove, cooling liquid enters the cooling cavity from the lower portion, after heat exchange is completed, the cooling liquid flows out of the top of the cooling cavity, the heat exchange effect is better, and liquid in the hydrogen flows to the lower portion along with the spiral groove; liquid in hydrogen is intercepted by the inner filter screen, and flows along the conical tip of the inner filter screen after being gathered, so that the gas-liquid separation effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a hydrogenation refining device for producing isohexane. Background Art

[0002] The raw material crude hexane and hydrogen enter the hydrogenation reactor for reaction, and the reactants enter the low separation tank. The oil phase coming out of the bottom of the low separation tank is sent to the fractionation device for precise fractionation to obtain normal hexane and isohexane. The circulating hydrogen flows back to the circulating hydrogen liquid separator through the upper part of the low separation tank, and further enters the circulating hydrogen compressor. After being pressurized by the circulating hydrogen compressor, it is mixed with fresh hydrogen, and the mixed hydrogen is injected into the circulating hydrogen desulfurization reaction tank to remove H2S in the circulating hydrogen. The hydrogen after H2S removal further enters the filtering and separation structure. The residual oxygen, chlorine, carbon dioxide and water in the hydrogen are filtered and enter the hydrogenation reactor again to participate in the reaction;

[0003] During the entire hydrogenation refining process, the circulating hydrogen separator separates the gas-liquid mixture discharged from the exhaust port of the low separator, and its separation effect directly affects the recycling effect of hydrogen;

[0004] Announcement No. CN 216964568 U discloses a hydrorefining device for extracting normal hexane and isohexane from crude hexane, wherein an annular cooling cavity 508 is provided in the middle of the circulating hydrogen separator tank, and a coolant inlet pipeline 511 and a coolant outlet pipeline 513 are provided at the lower end of the annular cooling cavity 508. The inner ring wall of the annular cooling cavity 508 is provided with a spiral groove 509, and the inner end of the hydrogen recovery pipe opening 505 of the circulating hydrogen separator tank 5 is tangentially inserted into the inner ring wall of the annular cooling cavity 508 and communicated with the starting end of the spiral groove 509, and the end of the spiral groove 509 extends to the lower edge of the inner ring wall of the annular cooling cavity 508. The hydrogen recovery pipe opening sends the recovered hydrogen tangentially into the annular cooling cavity 508 and most of the hydrogen goes down along the spiral groove 509. In this process, the annular cooling cavity cools the hydrogen;

[0005] This technical solution has two obvious defects. The coolant inlet pipe 511 and the coolant outlet pipe 513 are both arranged at the lower part of the annular cooling cavity 508, which will inevitably cause the coolant to short-circuit and flow out directly, resulting in poor cooling effect. The recorded hydrogen flows downward along the spiral groove 509, which does not conform to fluid mechanics. After entering the tank body, the hydrogen will flow directly upward, and the heat exchange time is very short. Utility Model Content

[0006] In order to solve the problems existing in the current hydrotreating device for producing isohexane, the utility model provides a hydrotreating device for producing isohexane.

[0007] The technical solution provided by the utility model is: a hydrorefining device for producing isohexane, comprising a hydrogenation reactor and a circulating hydrogen utilization unit, wherein the circulating hydrogen utilization unit comprises a circulating hydrogen desulfurization reaction tank, a compressor connected to the inlet of the circulating hydrogen desulfurization reaction tank, a pipeline at the inlet of the compressor connected to the hydrogen outlet of the circulating hydrogen separator tank, a hydrogen replenishment pipeline connected to the inlet of the compressor, and a filter connected between the outlet of the circulating hydrogen desulfurization reaction tank and the hydrogenation port of the hydrogenation reactor, and a feed port is provided at the top of the hydrogenation reactor;

[0008] The hydrogen reflux pipe of the circulating hydrogen separator tank is connected to the exhaust port of the low separator tank, the inlet of the low separator tank is connected to the product outlet of the hydrogenation reactor by a pipeline, and an oil phase outlet is provided at the bottom of the low separator tank;

[0009] The circulating hydrogen liquid separation tank includes a vertical tank body, a hydrogen outlet is provided at the upper part of the vertical tank body, a drain port is provided at the lower part of the vertical tank body, an annular cooling chamber is installed in the vertical tank body, the cooling chamber is a hollow structure, a coolant inlet pipe is welded at the lower part of the cooling chamber, the coolant inlet pipe extends out of the vertical tank body and is welded to the vertical tank body, a coolant outlet pipe is welded at the upper part of the cooling chamber, the coolant outlet pipe extends out of the vertical tank body and is welded to the vertical tank body, a hydrogen reflux pipe is welded on the tank wall of the vertical tank body, the hydrogen reflux pipe extends tangentially into the inner hole of the cooling chamber, the hydrogen reflux pipe is located at the lower part of the cooling chamber, the top of the cooling chamber is fixedly connected to an inner filter screen, the inner filter screen is a conical structure, the tip of the cone of the inner filter screen is located at the lower center of the cooling chamber, the top of the cooling chamber is fixedly connected to an outer filter screen, and the outer filter screen extends upwardly inclined to the inner wall of the vertical tank body.

[0010] The inner hole of the cooling cavity is processed with an inwardly concave spiral groove, and the hydrogen reflux pipe enters into the spiral groove of the cooling cavity tangentially.

[0011] The pipeline at the compressor inlet is connected to the hydrogen outlet of the circulating hydrogen separator tank, and the compressor inlet is connected to the hydrogen replenishing pipeline. The compressor inlet is connected to the hydrogen outlet of the circulating hydrogen separator tank through an ejector, and the suction pipe of the ejector is connected to the hydrogen replenishing pipeline.

[0012] The beneficial effects of the utility model are as follows: hydrogen flows upward along the spiral groove, and the coolant enters the cooling cavity from the bottom, and flows out from the top of the cooling cavity after the heat exchange is completed, so that the heat exchange effect is better, and the liquid in the hydrogen flows to the bottom along the spiral groove, and when the gas flowing inside the cooling cavity flows through the inner filter, the liquid in the hydrogen is intercepted and gathered by the inner filter and then flows to the bottom along the conical tip of the inner filter, and when the hydrogen outside the cooling cavity flows through the outer filter, the liquid in the hydrogen is intercepted and gathered by the outer filter and then flows downward along the outer circle of the cooling cavity, so that the gas-liquid separation effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a structural schematic diagram of the utility model;

[0014] Attached Figure 2 It is a structural schematic diagram of the circulating hydrogen liquid separation tank in the utility model.

[0015] In the figure, 1-hydrogenation reactor, 2-circulating hydrogen desulfurization reaction tank, 3-circulating hydrogen liquid separation tank, 4-compressor, 5-filter, 6-low separation tank, 7-ejector, 8-hydrogen replenishment pipeline, 9-vertical tank body, 10-cooling liquid inlet pipe, 11-cooling liquid outlet pipe, 12-hydrogen reflux pipe, 13-hydrogen outlet, 14-drain port, 15-cooling chamber, 16-spiral groove, 17-inner filter, 18-outer filter. DETAILED DESCRIPTION

[0016] like Figures 1-2 As shown, a hydrotreating device for producing isohexane includes a hydrogenation reactor 1 and a circulating hydrogen utilization unit, wherein the circulating hydrogen utilization unit includes a circulating hydrogen desulfurization reaction tank 2, a compressor 4 connected to the inlet of the circulating hydrogen desulfurization reaction tank 2, the inlet of the compressor 4 is connected to the hydrogen outlet 13 of the circulating hydrogen separator 3 by a pipeline, the inlet of the compressor 4 is connected to a hydrogen replenishing pipeline 8, and a filter 5 connected between the outlet of the circulating hydrogen desulfurization reaction tank 2 and the hydrogenation gas port of the hydrogenation reactor 1, and a feed port is provided at the top of the hydrogenation reactor 1;

[0017] The hydrogen reflux pipe 12 of the circulating hydrogen separator 3 is connected to the exhaust port of the low separator 6. The inlet of the low separator 6 is connected to the product outlet of the hydrogenation reactor 1 by a pipeline. The bottom of the low separator 6 is provided with an oil phase outlet.

[0018] The circulating hydrogen separator tank 3 includes a vertical tank body 9, a hydrogen outlet 13 is provided at the upper part of the vertical tank body 9, a drain port 14 is provided at the lower part of the vertical tank body 9, an annular cooling chamber 15 is installed in the vertical tank body 9, the cooling chamber 15 is a hollow structure, a coolant inlet pipe 10 is welded at the lower part of the cooling chamber 15, the coolant inlet pipe 10 extends out of the vertical tank body 9 and is welded to the vertical tank body 9, a coolant outlet pipe 11 is welded at the upper part of the cooling chamber 15, the coolant outlet pipe 11 extends out of the vertical tank body 9 and is welded to the vertical tank body 9. The tank body 9 is welded together, and a hydrogen reflux pipe 12 is welded on the tank wall of the vertical tank body 9. The hydrogen reflux pipe 12 extends tangentially into the inner hole of the cooling chamber 15. The hydrogen reflux pipe 12 is located in the lower part of the cooling chamber 15. The top of the cooling chamber 15 is fixedly connected to an inner filter screen 17. The inner filter screen 17 has a conical structure. The tip of the cone of the inner filter screen 17 is located at the lower center of the cooling chamber 15. The top of the cooling chamber 15 is fixedly connected to an outer filter screen 18. The outer filter screen 18 extends upwardly and obliquely to the inner wall of the vertical tank body 9.

[0019] The inner hole of the cooling chamber 15 is processed with an inwardly recessed spiral groove 16, and the hydrogen reflux pipe 12 enters the spiral groove 16 of the cooling chamber 15 tangentially, and the hydrogen flows upward along the spiral groove 16. The coolant enters the cooling chamber 15 from the bottom, and flows out from the top of the cooling chamber 15 after the heat exchange is completed, so that the heat exchange effect is better. The liquid in the hydrogen flows to the bottom along the spiral groove 16. When the gas flowing inside the cooling chamber 15 flows through the inner filter 17, the liquid in the hydrogen is intercepted and gathered by the inner filter 17 and flows to the bottom along the conical tip of the inner filter 17. When the hydrogen outside the cooling chamber 15 flows through the outer filter 18, the liquid in the hydrogen is intercepted and gathered by the outer filter 18 and flows downward along the outer circle of the cooling chamber 15, so that the gas-liquid separation effect is better.

[0020] The pipeline at the inlet of the compressor 4 is connected to the hydrogen outlet 13 of the circulating hydrogen separator tank 3, and the inlet of the compressor 4 is connected to the hydrogen replenishing pipeline 8. The replacement is as follows: the inlet of the compressor 4 is connected to the hydrogen outlet 13 of the circulating hydrogen separator tank 3 through the ejector 7, and the suction pipe of the ejector 7 is connected to the hydrogen replenishing pipeline 8. The hydrogen replenishing pipeline 8 is provided with a regulating valve, which can adjust the compensation amount of hydrogen as needed.

Claims

1. A hydrotreating device for producing isohexane, comprising a hydrogenation reactor (1) and a circulating hydrogen utilization unit, characterized in that: The circulating hydrogen utilization unit comprises a circulating hydrogen desulfurization reaction tank (2), a compressor (4) connected to the inlet of the circulating hydrogen desulfurization reaction tank (2), a pipeline at the inlet of the compressor (4) connected to the hydrogen outlet (13) of the circulating hydrogen separator (3), the inlet of the compressor (4) connected to a hydrogen replenishment pipeline (8), and a filter (5) connected between the outlet of the circulating hydrogen desulfurization reaction tank (2) and the hydrogenation port of the hydrogenation reactor (1); and a feed port is provided at the top of the hydrogenation reactor (1); The hydrogen reflux pipe (12) of the circulating hydrogen separation tank (3) is connected to the exhaust port of the low separation tank (6), the inlet of the low separation tank (6) is connected to the product outlet of the hydrogenation reactor (1) through a pipeline, and an oil phase outlet is provided at the bottom of the low separation tank (6); The circulating hydrogen liquid separation tank (3) comprises a vertical tank body (9), the upper part of the vertical tank body (9) is provided with a hydrogen outlet (13), the lower part of the vertical tank body (9) is provided with a liquid discharge port (14), an annular cooling chamber (15) is installed in the vertical tank body (9), the cooling chamber (15) is a hollow structure, a cooling liquid inlet pipe (10) is welded to the lower part of the cooling chamber (15), the cooling liquid inlet pipe (10) extends out of the vertical tank body (9) and is welded to the vertical tank body (9), a cooling liquid outlet pipe (11) is welded to the upper part of the cooling chamber (15), the cooling liquid outlet pipe (11) extends out of the vertical tank body (9) and is welded to the vertical tank body (9), and a cooling liquid outlet pipe (11) is welded to the upper part of the cooling chamber (15). The vertical tank body (9) is welded together, a hydrogen reflux pipe (12) is welded on the tank wall of the vertical tank body (9), the hydrogen reflux pipe (12) tangentially extends into the inner hole of the cooling chamber (15), the hydrogen reflux pipe (12) is located at the lower part of the cooling chamber (15), the top of the cooling chamber (15) is fixedly connected to an inner filter screen (17), the inner filter screen (17) is in a conical structure, the tip of the cone of the inner filter screen (17) is located at the lower center of the cooling chamber (15), the top of the cooling chamber (15) is fixedly connected to an outer filter screen (18), and the outer filter screen (18) extends upwardly obliquely to the inner wall of the vertical tank body (9).

2. A hydrotreating device for producing isohexane according to claim 1, characterized in that: The inner hole of the cooling cavity (15) is processed with an inwardly recessed spiral groove (16), and the hydrogen reflux pipe (12) enters tangentially into the spiral groove (16) of the cooling cavity (15).

3. A hydrotreating device for producing isohexane according to claim 1, characterized in that: The pipeline at the inlet of the compressor (4) is connected to the hydrogen outlet (13) of the circulating hydrogen separator (3), and the inlet of the compressor (4) is connected to the hydrogen replenishment pipeline (8), which is replaced by: the inlet of the compressor (4) is connected to the hydrogen outlet (13) of the circulating hydrogen separator (3) through the ejector (7), and the suction pipe of the ejector (7) is connected to the hydrogen replenishment pipeline (8).

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