Tubular hydrogenation device for preparing 2, 4-difluoroaniline

Abstract

The utility model relates to a tubular hydrogenation device for preparing 2, 4-difluoroaniline, which comprises a continuous tubular reactor, the tubular reactor comprises a plurality of groups of reaction tubes which are opposite front and back, and vertical U-shaped first connecting tubes are fixedly connected between the left ends of the upper and lower adjacent reaction tubes through bolt components respectively; horizontal U-shaped second connecting pipes are fixedly connected between the right ends of the front and rear adjacent reaction pipes through bolt assemblies, a vertical hydrogen main inlet pipe is inserted between the middle parts of the reaction pipes, and a plurality of hydrogen inlet pipes are arranged on the front and rear sides of the hydrogen main inlet pipe respectively; one end of each hydrogen inlet pipe is fixedly connected to the reaction pipe and is communicated with the reaction pipe, and a flange is formed at the other end; a plurality of hydrogen outlet holes opposite to the hydrogen inlet pipes are formed in the pipe walls of the front side and the rear side of the main hydrogen inlet pipe respectively, and locking fasteners matched with the hydrogen inlet pipes are arranged at the hydrogen outlet holes. The hydrogen inlet pipe and the hydrogen main inlet pipe on the tubular hydrogenation device are connected through the lock catch structure, the assembly requirement is low, and installation is convenient.

Description

Technical field:

[0001] The utility model relates to the technical field of hydrogenation reactors, and more specifically to a tubular hydrogenation device for preparing 2,4-difluoroaniline. Background technology:

[0002] 2,4-Difluoroaniline is an intermediate in organic synthesis. It is often used in the synthesis of difluorophenylsalicylic acid and polyfluorobenzoic acid in medicine. It is also an important intermediate in pesticides and is widely used in the preparation of organic synthesis, pharmaceutical chemicals, dyes and agricultural chemicals. The reaction principle of the currently commonly used gas phase hydrogenation method is: 2,4-difluoronitrobenzene is preheated and vaporized, and then enters a reactor equipped with a catalyst (such as a copper-silicon dioxide catalyst, a copper-aluminum oxide catalyst) to undergo a hydrogenation reduction reaction with hydrogen to obtain 2,4-difluoroaniline; because a large amount of heat is generated during the reaction process, a continuous tubular reactor is used as a reaction container for the convenience of heat dissipation; and each section of the reaction tube of the tubular reactor can be provided with a hydrogenation port, and hydrogen can be injected through multiple hydrogenation ports to improve the effect of the hydrogenation reduction reaction;

[0003] The current hydrogenation port is a hydrogen inlet pipe arranged in the middle of a tubular reactor. The hydrogen inlet pipe is provided with a flange, which is fixed to a vertical hydrogen inlet main pipe by bolts. However, because the reaction tubes are arranged relative to each other in front and rear, the hydrogen inlet main pipe is inserted between the hydrogen inlet pipes. In order to ensure effective sealing, the assembly requirements of the two are relatively high. In addition, multiple bolts need to be installed on the flange on the hydrogen inlet pipe. Due to the small installation space and the large number of installation bolts, the installation is more troublesome. Utility model content:

[0004] The utility model aims to solve the problems in the prior art and provides a tubular hydrogenation device for preparing 2,4-difluoroaniline. The hydrogen inlet pipe and the hydrogen main inlet pipe on the tubular hydrogenation device are connected by a locking structure, which has low assembly requirements and is easy to install.

[0005] A tubular hydrogenation device for preparing 2,4-difluoroaniline comprises a continuous tubular reactor, wherein the tubular reactor comprises a plurality of groups of reaction tubes which are opposite to each other and are horizontal, wherein a vertical U-shaped first connecting tube is fixedly connected between the left ends of the upper and lower adjacent reaction tubes through a bolt assembly, and a horizontal U-shaped second connecting tube is fixedly connected between the right ends of the front and rear adjacent reaction tubes through a bolt assembly, and a vertical hydrogen main inlet pipe is inserted between the middle parts of the reaction tubes, and a plurality of longitudinal hydrogen inlet pipes are respectively arranged on the front and rear sides of the hydrogen main inlet pipe, wherein one end of the hydrogen inlet pipe is respectively fixedly connected to the reaction tube and communicated with the reaction tube, and a flange is formed on the other end; a plurality of hydrogen outlet holes which are opposite to the hydrogen inlet pipe are respectively formed on the tube walls on the front and rear sides of the hydrogen main inlet pipe, and a locking member which matches the hydrogen inlet pipe is arranged at the hydrogen outlet hole;

[0006] The locking piece includes a semicircular lower locking sleeve and an upper locking sleeve, and the lower locking sleeve and the upper locking sleeve are distributed on the upper and lower sides of the hydrogen outlet hole; the lower locking sleeve and the upper locking sleeve are respectively formed with a semicircular lower clamping plate and an upper clamping plate on the inner wall close to one end of the reaction tube, and the hydrogen inlet tube is clamped and fixed between the lower clamping plate and the upper clamping plate; the outer walls on both sides of the lower locking sleeve and the upper locking sleeve are respectively formed with a horizontal lower ear seat and an upper ear seat, and the upper ear seat is plugged with a screw, and the lower end of the screw is threaded and fixed on the lower ear seat; the lower locking sleeve is welded and fixed on the hydrogen main inlet pipe, and the end face of the upper locking sleeve close to the side of the hydrogen main inlet pipe is against the outer wall of the hydrogen main inlet pipe.

[0007] Preferably, the upper surface of the lower locking sleeve and the lower surface of the upper locking sleeve are respectively adhered and fixed to the lower sealing member and the upper sealing member, and the upper sealing member and the lower sealing member respectively include a longitudinal upper sealing ring and a lower sealing ring in a semicircular shape, and the upper sealing ring and the lower sealing ring are pressed against the outer wall of the hydrogen inlet pipe;

[0008] A horizontal L-shaped lower sealing gasket and an upper sealing gasket are respectively formed at the two ends of the lower sealing ring and the upper sealing ring, and the lower sealing gasket and the upper sealing gasket are pressed against each other; a vertical and semicircular rear sealing gasket is formed at the rear end of the upper sealing gasket, and the rear sealing gasket is clamped between the upper locking sleeve and the hydrogen main inlet pipe.

[0009] Preferably, the flange of the hydrogen inlet pipe is inserted between the lower locking sleeve and the upper locking sleeve, the inner walls of the lower locking sleeve and the upper locking sleeve are in the same cylindrical surface, and the diameter of the upper flange of the hydrogen inlet pipe is smaller than the diameter of the inner wall of the locking sleeve.

[0010] Preferably, a rectangular frame-shaped support base is provided on the lower side of the tubular reactor, and vertical support columns are fixedly connected to the left and right sides of the support base respectively. The support columns are respectively inserted between the reaction tubes, and horizontal support rods are fixedly connected to both ends of the support columns respectively. Arc-shaped grooves are formed on the upper end surfaces of the front and rear sides of the support rods, and the reaction tubes are placed in the grooves of the support rods.

[0011] Preferably, a sealing plate is fixedly connected to the lower end of the hydrogen main inlet pipe, and the lower end of the sealing plate is inserted into the support base, and the lower end surface of the support base is flush with the lower end surface of the sealing plate.

[0012] Preferably, a gap is provided between the hydrogen inlet pipe and the hydrogen main inlet pipe on the reaction tube.

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

[0014] The hydrogen inlet pipe and the hydrogen main inlet pipe on the tubular hydrogenation device are connected by a lock structure, which has low assembly requirements and is easy to install. Description of the drawings:

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the utility model in a front view;

[0017] Figure 3 for Figure 1 A local enlarged schematic diagram of the middle A;

[0018] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure at B-B in the middle.

[0019] In the figure: 1, reaction tube; 2, first connecting tube; 3, second connecting tube; 4, hydrogen inlet pipe; 5, hydrogen main inlet pipe; 51, hydrogen outlet hole; 6, locking piece; 61, lower locking sleeve; 62, upper locking sleeve; 63, lower sealing piece; 64, upper sealing piece; 65, screw; 7, support base; 8, support column; 9, support rod; 91, groove; 10, sealing plate. Specific implementation method:

[0020] Example: See Figures 1 to 4 As shown, a tubular hydrogenation device for preparing 2,4-difluoroaniline comprises a continuous tubular reactor, wherein the tubular reactor comprises a plurality of groups of reaction tubes 1 which are opposite to each other and are horizontal, wherein a vertical U-shaped first connecting tube 2 is fixedly connected between the left ends of the upper and lower adjacent reaction tubes 1 by bolt assemblies, respectively, and a horizontal U-shaped second connecting tube 3 is fixedly connected between the right ends of the front and rear adjacent reaction tubes 1 by bolt assemblies, respectively, and a vertical hydrogen main inlet pipe 5 is inserted between the middle parts of the reaction tubes 1, and a plurality of longitudinal hydrogen inlet pipes 4 are respectively arranged on the front and rear sides of the hydrogen main inlet pipe 5, wherein one end of the hydrogen inlet pipe 4 is respectively fixedly connected to the reaction tube 1 and is connected to the reaction tube 1, and a flange is formed on the other end; a plurality of hydrogen outlet holes 51 which are opposite to the hydrogen inlet pipe 4 are respectively formed on the tube walls on the front and rear sides of the hydrogen main inlet pipe 5, and a locking member 6 which matches the hydrogen inlet pipe 4 is arranged at the hydrogen outlet hole 51;

[0021] The locking member 6 includes a semicircular lower locking sleeve 61 and an upper locking sleeve 62, and the lower locking sleeve 61 and the upper locking sleeve 62 are distributed on the upper and lower sides of the hydrogen outlet hole 51; the lower locking sleeve 61 and the upper locking sleeve 62 are respectively formed with a semicircular lower clamp and an upper clamp on the inner wall close to one end of the reaction tube 1, and the hydrogen inlet pipe 4 is clamped and fixed between the lower clamp and the upper clamp; the outer walls on both sides of the lower locking sleeve 61 and the upper locking sleeve 62 are respectively formed with a horizontal lower ear seat 611 and an upper ear seat 621, and the upper ear seat 621 is inserted with a screw 65, and the lower end of the screw 65 is threadedly fixed on the lower ear seat 611; the lower locking sleeve 61 is welded and fixed on the hydrogen main inlet pipe 5, and the end face of the upper locking sleeve 62 close to the hydrogen main inlet pipe 5 is against the outer wall of the hydrogen main inlet pipe 5.

[0022] The upper surface of the lower locking sleeve 61 and the lower surface of the upper locking sleeve 62 are respectively adhered and fixed to the lower sealing member 63 and the upper sealing member 64, and the upper sealing member 64 and the lower sealing member 63 respectively include a longitudinal and semicircular upper sealing ring 641 and a lower sealing ring 631, and the upper sealing ring 641 and the lower sealing ring 631 are pressed against the outer wall of the hydrogen inlet pipe 4;

[0023] A horizontal L-shaped lower sealing gasket 632 and an upper sealing gasket 642 are respectively formed at the two ends of the lower sealing ring 631 and the upper sealing ring 641, and the lower sealing gasket 632 and the upper sealing gasket 642 are pressed against each other; a vertical and semicircular rear sealing gasket 643 is formed at the rear end of the upper sealing gasket 642, and the rear sealing gasket 643 is clamped between the upper locking sleeve 62 and the hydrogen main inlet pipe 5.

[0024] The flange of the hydrogen inlet pipe 4 is inserted between the lower locking sleeve 61 and the upper locking sleeve 62 . The inner walls of the lower locking sleeve 61 and the upper locking sleeve 62 are in the same cylindrical surface. The diameter of the upper flange of the hydrogen inlet pipe 4 is smaller than the diameter of the inner wall of the locking sleeve 62 .

[0025] A rectangular frame-shaped support base 7 is provided on the lower side of the tubular reactor, and vertical support columns 8 are fixedly connected to the left and right sides of the support base 7, respectively. The support columns 8 are respectively inserted between the reaction tubes 1, and horizontal support rods 9 are fixedly connected to both ends of the support columns 8. Arc-shaped grooves 91 are formed on the upper end surfaces of the front and rear sides of the support rods 9. The reaction tube 1 is placed in the grooves 91 of the support rods 9. The vertical arrangement of the tubular reactor is realized by the support base 7, the support columns 8 and the support rods 9.

[0026] A sealing plate 10 is fixedly connected to the lower end of the hydrogen main inlet pipe 5 . The lower end of the sealing plate 10 is inserted into the support base 7 . The lower end surface of the support base 7 is flush with the lower end surface of the sealing plate 10 .

[0027] A gap is provided between the hydrogen inlet pipe 4 and the hydrogen main inlet pipe 5 on the reaction tube 1 , and flanges are formed at the ends of the reaction tube 1 , the ends of the first connecting pipe 2 , and the ends of the second connecting pipe 3 , respectively.

[0028] Working principle: The utility model is a tubular hydrogenation device for preparing 2,4-difluoroaniline. Its main technical point is reflected in the assembly structure between the hydrogen main inlet pipe 5 and the hydrogen inlet pipe 4, which adopts a locking member 6 to achieve connection. During installation, the hydrogen inlet pipe 4 is inserted into the lower locking sleeve 61, and then the upper locking sleeve 62 is covered. Finally, the connection can be achieved by tightening two screws 65, and the installation and connection are convenient.

[0029] The embodiments are used to illustrate the present invention, but not to limit the present invention. Any person skilled in the art may modify the embodiments without violating the spirit and scope of the present invention, and therefore the scope of protection of the present invention shall be as set forth in the claims of the present invention.

Claims

1. A tubular hydrogenation device for preparing 2,4-difluoroaniline, comprising a continuous tubular reactor, the tubular reactor comprising a plurality of groups of reaction tubes (1) facing each other in front and rear and being horizontal, a vertical U-shaped first connecting tube (2) being fixedly connected between the left ends of the upper and lower adjacent reaction tubes (1) by bolt assemblies, a horizontal U-shaped second connecting tube (3) being fixedly connected between the right ends of the front and rear adjacent reaction tubes (1) by bolt assemblies, a vertical hydrogen main inlet pipe (5) being inserted between the middle parts of the reaction tubes (1), a plurality of longitudinal hydrogen inlet pipes (4) being respectively provided at the front and rear sides of the hydrogen main inlet pipe (5), one end of the hydrogen inlet pipe (4) being respectively fixedly connected to the reaction tube (1) and being connected to the reaction tube (1), and a flange being formed at the other end; characterized in that: A plurality of hydrogen outlet holes (51) are formed on the front and rear walls of the hydrogen main inlet pipe (5) and are opposite to the hydrogen inlet pipe (4). The hydrogen outlet holes (51) are provided with locking parts (6) that match the hydrogen inlet pipe (4). The locking member (6) comprises a semicircular lower locking sleeve (61) and an upper locking sleeve (62), the lower locking sleeve (61) and the upper locking sleeve (62) being distributed on the upper and lower sides of the hydrogen outlet hole (51); the inner walls of the lower locking sleeve (61) and the upper locking sleeve (62) close to one end of the reaction tube (1) are respectively formed with a semicircular lower clamping plate and an upper clamping plate, and the hydrogen inlet tube (4) is clamped and fixed between the lower clamping plate and the upper clamping plate; the lower locking sleeve (61) and the upper locking sleeve are respectively formed with a semicircular lower clamping plate and an upper clamping plate. A horizontal lower ear seat (611) and an upper ear seat (621) are respectively formed on the outer walls on both sides of the sleeve (62); a screw (65) is inserted into the upper ear seat (621); the lower end of the screw (65) is threadedly fixed to the lower ear seat (611); the lower locking sleeve (61) is welded and fixed to the hydrogen main inlet pipe (5); the end surface of the upper locking sleeve (62) close to the hydrogen main inlet pipe (5) is pressed against the outer wall of the hydrogen main inlet pipe (5).

2. A tubular hydrogenation device for preparing 2,4-difluoroaniline according to claim 1, characterized in that: The upper surface of the lower locking sleeve (61) and the lower surface of the upper locking sleeve (62) are respectively adhered and fixed to the lower sealing member (63) and the upper sealing member (64), and the upper sealing member (64) and the lower sealing member (63) respectively include a longitudinal and semicircular upper sealing ring (641) and a lower sealing ring (631), and the upper sealing ring (641) and the lower sealing ring (631) are pressed against the outer wall of the hydrogen inlet pipe (4); A horizontal L-shaped lower sealing gasket (632) and an upper sealing gasket (642) are respectively formed at the two ends of the lower sealing ring (631) and the upper sealing ring (641), and the lower sealing gasket (632) and the upper sealing gasket (642) are pressed against each other; a vertical and semicircular rear sealing gasket (643) is formed at the rear end of the upper sealing gasket (642), and the rear sealing gasket (643) is clamped between the upper locking buckle sleeve (62) and the hydrogen main inlet pipe (5).

3. A tubular hydrogenation device for preparing 2,4-difluoroaniline according to claim 2, characterized in that: The flange of the hydrogen inlet pipe (4) is inserted between the lower locking sleeve (61) and the upper locking sleeve (62), the inner walls of the lower locking sleeve (61) and the upper locking sleeve (62) are in the same cylindrical surface, and the diameter of the upper flange of the hydrogen inlet pipe (4) is smaller than the diameter of the inner wall of the locking sleeve (62).

4. A tubular hydrogenation device for preparing 2,4-difluoroaniline according to claim 1, characterized in that: A rectangular frame-shaped support base (7) is provided at the lower side of the tubular reactor. Vertical support columns (8) are fixedly connected to the left and right sides of the support base (7). The support columns (8) are respectively inserted between the reaction tubes (1). Horizontal support rods (9) are fixedly connected to the two ends of the support columns (8). Arc-shaped grooves (91) are formed on the upper end surfaces of the front and rear sides of the support rods (9). The reaction tube (1) is placed in the grooves (91) of the support rods (9).

5. A tubular hydrogenation device for preparing 2,4-difluoroaniline according to claim 4, characterized in that: A sealing plate (10) is fixedly connected to the lower end of the hydrogen main inlet pipe (5), and the lower end of the sealing plate (10) is inserted into the support base (7), and the lower end surface of the support base (7) is flush with the lower end surface of the sealing plate (10).

6. A tubular hydrogenation device for preparing 2,4-difluoroaniline according to claim 1, characterized in that: A gap is provided between the hydrogen inlet pipe (4) and the hydrogen main inlet pipe (5) on the reaction tube (1).

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