Reactor for preparing butanedioic anhydride through maleic anhydride hydrogenation

Abstract

The reactor comprises an upper sealing head, an upper section reaction area, a heat exchange area, a lower section reaction area and a lower sealing head which are sequentially connected from top to bottom, the upper sealing head is connected with a feeding pipe, and the lower sealing head is connected with a discharging pipe. The reactor is a single reactor, the multiple sections of reactors and the heat exchanger are integrated, succinic anhydride is prepared by the single reactor, and compared with a traditional arrangement mode that the multiple sections of reactors and the heat exchanger are connected in series, the reactor has the advantages that the number of devices is optimized, the occupied area is small, and the reactor is convenient to install; and a good heat dissipation effect is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment and relates to a reactor for preparing succinic anhydride by hydrogenating maleic anhydride. Background Art

[0002] At present, the process of preparing succinic anhydride by hydrogenation of maleic anhydride usually requires the use of multi-stage hydrogenation reactors and heat exchange processes, which will lead to complicated equipment layout, large floor space and high equipment investment in the entire process. Therefore, a new type of reactor structure is needed to integrate multi-stage hydrogenation reactors and heat exchange processes to simplify equipment layout and reduce equipment investment, thereby achieving economic and safety of project investment. Utility Model Content

[0003] The utility model aims to provide a reactor for preparing succinic anhydride by hydrogenating maleic anhydride, which integrates the multi-stage reactor and heat exchanger in the prior art into one device, has a small footprint, is easy to install, and has good heat dissipation effect.

[0004] The technical scheme adopted by the utility model is that a reactor for preparing succinic anhydride by hydrogenating maleic anhydride comprises an upper end cap, an upper reaction zone, a heat exchange zone, a lower reaction zone and a lower end cap which are connected in sequence from top to bottom, the upper end cap is connected with a feed pipe, and the lower end cap is connected with a discharge pipe.

[0005] The utility model is also characterized in that:

[0006] A skirt support is arranged at the bottom of the reactor.

[0007] A feed distributor is arranged between the feed pipe and the upper reaction zone.

[0008] The feed distributor is conical in shape, with the opening becoming larger at the bottom.

[0009] The upper reaction zone and the lower reaction zone are both provided with a pressure monitoring system, a catalyst bed and a temperature monitoring system.

[0010] Heat exchange tubes are arranged in the heat exchange area.

[0011] The upper reaction zone and the heat exchange zone are connected by flanges.

[0012] The heat exchange zone and the lower reaction zone are connected by flanges.

[0013] The beneficial effects of the utility model are:

[0014] (1) The reactor of the utility model is a single reactor, which integrates a multi-stage reactor and a heat exchanger into one, so that a single reactor can complete the preparation of succinic anhydride. Compared with the traditional arrangement of a multi-stage reactor and a heat exchanger in series, the reactor of the utility model optimizes the number of equipment, occupies a small area, and is easy to install;

[0015] (2) The reactor of the utility model adopts a conical feed distributor, which is conducive to the uniform distribution of materials to a certain extent, avoiding the problem of catalyst coking and failure caused by uneven material distribution, resulting in reduced reaction efficiency;

[0016] (3) The upper and lower reaction zones of the reactor of the utility model are both equipped with temperature and pressure monitoring systems, which can more accurately and efficiently control the temperature and pressure of the entire reaction process, effectively solving the problem of heat dissipation difficulties and low reaction efficiency of a single reactor, and can meet the needs of large-scale industrial production;

[0017] (4) The upper reaction zone, middle heat exchange zone, and lower reaction zone of the reactor of the utility model adopt a flange-stud connection structure, which is convenient for operators to perform maintenance operations during use. Compared with the situation where multiple devices are connected in series, the cost of maintenance operations is greatly reduced and the operating efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the reactor of the utility model.

[0019] In the figure, 1. feed pipe, 2. feed distributor, 3. upper head, 4. upper reaction zone, 5. upper reaction zone pressure monitoring system, 6. upper reaction zone catalyst bed, 7. upper reaction zone temperature monitoring system, 8. heat exchange zone, 9. lower reaction zone, 10. lower reaction zone pressure monitoring system, 11. lower reaction zone catalyst bed, 12. lower reaction zone temperature monitoring system, 13. lower head, 14. discharge pipe, 15. skirt support. DETAILED DESCRIPTION

[0020] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0021] Example 1

[0022] The utility model reactor for preparing succinic anhydride by hydrogenation of maleic anhydride has a structure as follows Figure 1 As shown, it includes an upper head 3, an upper reaction zone 4, a heat exchange zone 8, a lower reaction zone 9 and a lower head 13 which are connected in sequence from top to bottom. The upper head 3 is connected to a feed pipe 1, and the lower head 13 is connected to a discharge pipe 14.

[0023] Example 2

[0024] The utility model reactor for preparing succinic anhydride by hydrogenation of maleic anhydride has a structure as follows Figure 1 As shown, it includes an upper end cap 3, an upper reaction zone 4, a heat exchange zone 8, a lower reaction zone 9 and a lower end cap 13 connected in sequence from top to bottom, the upper end cap 3 is connected to a feed pipe 1, and the lower end cap 13 is connected to a discharge pipe 14. A skirt support 15 is provided at the bottom of the reactor.

[0025] A feed distributor 2 is provided between the feed pipe 1 and the upper reaction zone 4. The feed distributor 2 is conical, and its lower opening becomes larger.

[0026] The upper reaction zone 4 and the lower reaction zone 9 are both provided with a pressure monitoring system, a catalyst bed and a temperature monitoring system.

[0027] Heat exchange tubes are arranged in the heat exchange area 8 .

[0028] The upper reaction zone 4 and the heat exchange zone 8 are connected by flanges.

[0029] Example 3

[0030] The utility model reactor for preparing succinic anhydride by hydrogenation of maleic anhydride has a structure as follows Figure 1 As shown, it includes an upper head 3, a feed distributor 2, an upper reaction zone 4, a heat exchange zone 8, a lower reaction zone 9, a lower head 13 and a skirt support 15 connected in sequence from top to bottom. The upper head 3 and the lower head 13 are respectively connected with a feed pipe 1 and a discharge pipe 14. Maleic anhydride and hydrogen and other materials are fully mixed through the feed distributor 2 from the feed pipe 1 and enter the upper reaction zone 4. They are fully reacted in the upper reaction zone 4, the heat exchange zone 8 and the lower reaction zone 9 to completely generate succinic anhydride, and the reaction product is sent out of the reactor body through the discharge pipe 14.

[0031] A flange-stud connection structure is used between the upper reaction zone 4, the heat exchange zone 8 and the lower reaction zone 9. This structure can be disassembled and assembled in time to facilitate the operator's inspection, maintenance and loading and unloading operations during use.

[0032] The feed distributor 2 adopts a conical structure, and the opening below becomes larger. When the material enters the upper reaction zone 4 from the feed pipe 1 and passes through the conical feed distributor 2, the material flow direction is changed due to the conical structure of the feed distributor 2. At the same time, since the feed distributor 2 is conical, it will not cause too much pressure drop. The feed distributor 2 has a smooth transition at all places, which effectively avoids the collision of the material at the top of the reactor. Moreover, the material enters the reactor bed along the entire circumferential direction, which is conducive to the uniform distribution of the material to a certain extent, avoiding the problem of catalyst coking and failure caused by uneven material distribution.

[0033] The upper reaction zone 4 is provided with an upper reaction zone pressure monitoring system 5, an upper reaction zone catalyst bed 6 and an upper reaction zone temperature monitoring system 7. The lower reaction zone 9 is provided with a lower reaction zone pressure monitoring system 10, a lower reaction zone catalyst bed 11 and a lower reaction zone temperature monitoring system 12.

[0034] The pressure monitoring system is used to monitor the internal pressure of the reactor in real time. It includes several remote pressure gauges. Through pressure sensing, the measured value is transmitted in the form of electrical value to a secondary instrument far away from the measuring point to achieve real-time centralized detection. The flow rate of the material at the inlet is controlled by an automatic control valve, thereby adjusting the internal pressure of the reactor to ensure pressure stability and normal reaction.

[0035] The temperature monitoring system is used to monitor the internal temperature of the reactor in real time. It includes several remote thermometers. Through temperature sensing, the measured value is transmitted to the secondary instrument far away from the measuring point in the form of electrical value to achieve real-time centralized detection, and the flow of quenching liquid and heat exchange medium is adjusted through the automatic control valve, so as to adjust the temperature of the reactor in time to achieve the purpose of heat dissipation inside the reactor.

[0036] The catalyst bed is used to place the catalyst to play a role in catalytic reaction.

[0037] Heat exchange tubes are arranged in the heat exchange area 8 to perform heat exchange, and the tube bundles can be adjusted according to the process operation requirements to meet different heat exchange needs.

Claims

1. A reactor for preparing succinic anhydride by hydrogenation of maleic anhydride, characterized in that: It comprises an upper end cap (3), an upper reaction zone (4), a heat exchange zone (8), a lower reaction zone (9) and a lower end cap (13) which are connected in sequence from top to bottom, wherein the upper end cap (3) is connected to a feed pipe (1), and the lower end cap (13) is connected to a discharge pipe (14); The upper reaction zone (4) and the lower reaction zone (9) are both provided with a pressure monitoring system, a catalyst bed and a temperature monitoring system.

2. The reactor for preparing succinic anhydride by hydrogenation of maleic anhydride according to claim 1, characterized in that: A skirt-type support (15) is provided at the bottom of the reactor.

3. The reactor for preparing succinic anhydride by hydrogenation of maleic anhydride according to claim 1, characterized in that: A feed distributor (2) is provided between the feed pipe (1) and the upper reaction zone (4).

4. The reactor for preparing succinic anhydride by hydrogenation of maleic anhydride according to claim 3, characterized in that: The feed distributor (2) is conical, and its lower opening becomes larger.

5. The reactor for preparing succinic anhydride by hydrogenation of maleic anhydride according to claim 1, characterized in that: Heat exchange tubes are arranged in the heat exchange area (8).

6. The reactor for preparing succinic anhydride by hydrogenation of maleic anhydride according to claim 1, characterized in that: The upper reaction zone (4) and the heat exchange zone (8) are connected by flanges.

7. The reactor for preparing succinic anhydride by hydrogenation of maleic anhydride according to claim 1, characterized in that: The heat exchange zone (8) and the lower reaction zone (9) are connected by a flange.

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