Device for reducing aromatic hydrocarbon content in alkane

Abstract

The utility model relates to a device for reducing aromatic hydrocarbon content in alkane, which comprises a dearomatization cylinder body, a catalyst packing layer, a distributor and a support seat, a feed pipe is arranged at the top of the dearomatization cylinder body, and a discharge pipe is arranged at the bottom of the dearomatization cylinder body, and is technically characterized in that a vertical pipe is arranged at the center of the dearomatization cylinder body, and the lower end of the vertical pipe is closed and fixed on the support seat; the upper end of the vertical pipe sequentially penetrates through the catalyst packing layer and the distributor and then reaches the position above the distributor, the upper end of the vertical pipe is fixedly connected with the lower end of the lead bent pipe, the upper end of the lead bent pipe penetrates through the side wall of the feeding pipe and is fixedly welded to the feeding pipe, a plurality of radial holes are formed in the side wall of the vertical pipe from top to bottom at intervals, and a temperature sensor is fixed to the inner side of each radial hole. And an output cable of each temperature sensor reaches the outer side of the dearomatization cylinder through the vertical pipe and the lead bent pipe. The device protects the use intensity of the cylinder on one hand, greatly increases the number of monitoring points on the other hand, and improves the monitoring precision.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a device for reducing the content of aromatic hydrocarbons in alkanes. Background Art

[0002] Alkanes containing aromatics will bring difficulties and disadvantages to subsequent applications. Removing aromatics and avoiding the generation of new impurities can improve the purity of alkanes. Currently, the removal of aromatics is mostly done by hydrogenation dearomatization reaction and molecular sieve adsorption.

[0003] CN 204816458 U discloses a hydrodearomatization reactor for oil refining. A second pipe is installed on an elbow, which is installed on a first pipe. A lifting lug is installed on the elbow. The first pipe is installed on a flange cover, which is installed on a flange. An inlet distributor is installed in a head through a positioning block, which is installed on the top of a cylinder. A lower insulation ring is installed on the cylinder. A gas-liquid distributor is installed in the cylinder. A first porcelain column is installed on the inner wall of the cylinder. A second porcelain column is installed on the inner wall of the cylinder. An upper stainless steel wire mesh is installed on the inner wall of the cylinder. A thermocouple sleeve is installed on the side wall outside the cylinder. An ear-type support is installed on the outer wall of the cylinder. A grounding plate is installed on the ear-type support. A lower stainless steel wire mesh is installed in the cylinder. An outlet collector is installed on the inner wall of the bottom surface of the cylinder. A material outlet pipe is installed on the outer wall of the bottom surface of the cylinder. A catalyst unloading pipe is installed on the outer wall of the bottom surface of the cylinder. A unloading plate is installed in the catalyst unloading pipe. The reactor can solve the problem of intelligent temperature control in production by installing several thermocouples on the cylinder, effectively saving energy, improving production efficiency, and controlling product quality. However, there are still the following problems when using it: it is necessary to open multiple thermocouple installation ports on the outer wall of the cylinder, which is not conducive to maintaining the strength of the cylinder. At the same time, in order to protect the cylinder, the number of thermocouple installation ports should not be too many, and the temperature conditions at different height levels in the cylinder cannot be monitored. Utility Model Content

[0004] The purpose of the utility model is to provide a device for reducing the aromatic content in alkanes to solve the above problem, which protects the use strength of the cylinder on the one hand and greatly increases the number of monitoring points and improves the monitoring accuracy on the other hand.

[0005] The technical solution of the utility model is:

[0006] A device for reducing the aromatic content in alkanes comprises a dearomatization cylinder, a catalyst packing layer arranged in the dearomatization cylinder, a distributor arranged above the catalyst packing layer, and a support seat arranged below the catalyst packing layer. A feed pipe is arranged at the top of the dearomatization cylinder, and a discharge pipe is arranged at the bottom. The technical key points are: a standpipe is arranged at the center of the dearomatization cylinder, the lower end of the standpipe is closed and fixed on the support seat, the upper end of the standpipe passes through the catalyst packing layer and the distributor in sequence and then reaches the top of the distributor, the upper end of the standpipe is connected and fixed to the lower end of the lead bend, the upper end of the lead bend passes through the side wall of the feed pipe and is welded and fixed to the feed pipe, a plurality of radial holes are arranged at intervals on the side wall of the standpipe from top to bottom, a temperature sensor is fixed on the inner side of each radial hole, and the output cable of each temperature sensor reaches the outside of the dearomatization cylinder via the standpipe and the lead bend.

[0007] In the above-mentioned device for reducing the aromatic hydrocarbon content in alkanes, the directions of two adjacent radial holes are opposite.

[0008] In the above-mentioned device for reducing the aromatic content in alkanes, an annular skirt is provided in the middle of the outer wall of the temperature sensor, the front end of the temperature sensor is inserted into the radial hole, the annular skirt is connected and fixed to the inner wall of the standpipe, and a sealing ring is provided between the inner wall of the standpipe.

[0009] In the above-mentioned device for reducing the content of aromatic hydrocarbons in alkanes, the vertical pipe is a square pipe.

[0010] The above-mentioned device for reducing the aromatic hydrocarbon content in alkanes, the upper and lower surfaces of the catalyst packing layer are respectively provided with sieve plates, the support seat includes a support ring, a positioning plate arranged at the center of the support ring, and a plurality of connecting ribs arranged between the support ring and the positioning plate, the sieve plate is led out from the lower end of the vertical pipe and fixed on the positioning plate, and an avoidance hole corresponding to the vertical pipe is provided in the center of the sieve plate.

[0011] The beneficial effects of the utility model are:

[0012] In order to achieve the purpose of monitoring the temperature of each layer in the height direction of the dearomatization cylinder, a vertical pipe is set in the dearomatization cylinder, and a plurality of radial holes are set on the side wall of the vertical pipe from top to bottom, and temperature sensors are set in the radial holes. Each temperature sensor can be used to monitor the temperature of materials at different height layers. As many temperature sensors as possible can be set according to needs, and there is no need to consider the use intensity of the dearomatization cylinder. The output cable of the temperature sensor is led out to the outside of the dearomatization cylinder through a lead bend pipe and then connected to the monitoring terminal, thereby achieving the monitoring purpose. The utility model protects the use intensity of the cylinder on the one hand, and can greatly increase the number of monitoring points on the other hand, thereby improving the monitoring accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0014] Figure 2yes Figure 1 Schematic diagram of the combination of neutral tube and lead bend tube;

[0015] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0016] In the figure: 1. feed pipe, 2. lead bend pipe, 3. dearomatization cylinder, 4. riser, 5. distributor, 6. sieve plate, 7. catalyst packing layer, 8. sieve plate, 9. support seat, 10. discharge pipe, 11. radial hole, 12. temperature sensor, 13. output cable, 14. annular skirt. DETAILED DESCRIPTION

[0017] The utility model is described in detail according to the accompanying drawings of the specification.

[0018] like Figure 1 to Figure 3 As shown, the device for reducing the aromatic content in alkanes comprises a dearomatization cylinder 3 with a heating interlayer, a catalyst packing layer 7 arranged in the dearomatization cylinder 3, a distributor 5 arranged above the catalyst packing layer 7, and a support seat 9 arranged below the catalyst packing layer 7. A feed pipe 1 is arranged at the top of the dearomatization cylinder 3, and a discharge pipe 10 is arranged at the bottom.

[0019] Among them, a standpipe 4 is provided at the center of the dearomatization cylinder 3, the lower end of the standpipe 4 is closed and fixed on the support seat 9, and the upper end of the standpipe 4 passes through the catalyst packing layer 7 and the distributor 5 in sequence and reaches the top of the distributor 5. The upper end of the standpipe 4 is connected and fixed to the lower end of the lead bend 2, and the upper end of the lead bend 2 passes through the side wall of the feed pipe 1 and is welded and fixed to the feed pipe 1. The side wall of the standpipe 4 is provided with a plurality of radial holes 11 from top to bottom, and a temperature sensor 12 is fixed inside each radial hole 11, and the output cable 13 of each temperature sensor 12 reaches the outside of the dearomatization cylinder 3 via the standpipe 4 and the lead bend 1.

[0020] In this embodiment, the standpipe 4 is a square tube, and the directions of two adjacent radial holes 11 are opposite. An annular skirt 14 is provided in the middle of the outer wall of the temperature sensor 12, and the front end of the temperature sensor 12 is inserted into the radial hole 11. The annular skirt 14 is connected and fixed to the inner wall of the standpipe 4, and a sealing ring is provided between the inner wall of the standpipe 4.

[0021] The upper and lower surfaces of the catalyst packing layer 7 are provided with sieve plates 6 and 8, respectively. The support seat 9 includes a support ring, a positioning plate provided at the center of the support ring, and a plurality of connecting ribs provided between the support ring and the positioning plate. The sieve plate 8 is led out from the lower end of the vertical pipe 4 and fixed on the positioning plate. The sieve plates 6, 8 and the distributor 5 are provided with avoidance holes corresponding to the vertical pipe 4 in the center.

[0022] Working principle:

[0023] When in use, the alkane solution to be dearomatized is added to the dearomatization cylinder 3 through the feed pipe 1 at the top of the dearomatization cylinder 3, and the alkane solution is evenly dispersed through the distributor 5 and falls into the catalyst packing layer 7. The dearomatized alkane solution passes through the support seat 9 and falls into the bottom of the dearomatization cylinder 3, and is then discharged through the discharge pipe 10. In this process, the temperature of the materials at different height layers is monitored by each temperature sensor 12, and the heating temperature of the dearomatization cylinder 3 is adjusted in time through the signal feedback of the temperature sensor 12.

[0024] The above is a detailed description of the embodiments of the utility model, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the invention of the utility model should still fall within the scope of this patent.

Claims

1. A device for reducing the aromatic content in alkanes, comprising a dearomatization cylinder, a catalyst packing layer arranged in the dearomatization cylinder, a distributor arranged above the catalyst packing layer, and a support seat arranged below the catalyst packing layer, wherein a feed pipe is arranged at the top of the dearomatization cylinder and a discharge pipe is arranged at the bottom, characterized in that: A riser is provided at the center of the dearomatization cylinder, the lower end of which is closed and fixed on a support seat, the upper end of which passes through a catalyst packing layer and a distributor in sequence and reaches above the distributor, the upper end of the riser is connected and fixed to the lower end of a lead bend, the upper end of the lead bend passes through the side wall of a feed pipe and is welded and fixed to the feed pipe, a plurality of radial holes are provided at intervals from top to bottom on the side wall of the riser, a temperature sensor is fixed on the inner side of each radial hole, and the output cable of each temperature sensor reaches the outside of the dearomatization cylinder via the riser and the lead bend.

2. The device for reducing the content of aromatic hydrocarbons in alkanes according to claim 1, characterized in that: The directions of two adjacent radial holes are opposite.

3. The device for reducing the content of aromatic hydrocarbons in alkanes according to claim 1, characterized in that: An annular skirt is provided in the middle of the outer wall of the temperature sensor, the front end of the temperature sensor is inserted into the radial hole, the annular skirt is connected and fixed to the inner wall of the riser, and a sealing ring is provided between the annular skirt and the inner wall of the riser.

4. The device for reducing the content of aromatic hydrocarbons in alkanes according to claim 1, characterized in that: The vertical pipe is a square pipe.

5. The device for reducing the content of aromatic hydrocarbons in alkanes according to claim 1, characterized in that: The upper and lower surfaces of the catalyst packing layer are respectively provided with sieve plates, the support seat includes a support ring, a positioning plate arranged at the center of the support ring, and a plurality of connecting ribs arranged between the support ring and the positioning plate. The sieve plate is led out from the lower end of the vertical pipe and fixed on the positioning plate, and an avoidance hole corresponding to the vertical pipe is provided in the center of the sieve plate.

Images