CN221868398U - Tubular reactor for synthesizing alpha-acetyl-gamma-butyrolactone by high-efficiency catalytic acetylation - Google Patents

Abstract

The utility model relates to a tubular reactor for efficiently catalyzing acetylation to synthesize α-acetyl-γ-butyrolactone, comprising a cylindrical ring-shaped reaction tank, the upper and lower ends of the reaction tank are respectively formed with heads, the top of the head at the upper end of the reaction tank is formed with a vertical reactant inlet, the head on one side of the reactant inlet is formed with an inclined loading port, the reaction tank is provided with a heat exchange component, the bottom of the head at the lower end of the reaction tank is provided with an opening, a bottom shell with an arc-shaped cross section is inserted in the opening, a reactant outlet is formed at the bottom end of the bottom shell, an arc-shaped connecting sleeve is formed on the outer wall of the upper end of the bottom shell, the connecting sleeve abuts against the outer wall of the head and is fixedly connected with a connecting ring with a D-shaped cross section, and the connecting ring is inserted on the outer wall of the head. The structure of the tubular reactor is convenient for realizing the replacement of the catalyst filled therein, and there is no need to disassemble the reactor, thereby reducing the time of stopping the reaction due to the replacement of the catalyst, thereby improving the production efficiency of the reactor.

Description

A shell-and-tube reactor for efficient catalytic acetylation to synthesize α-acetyl-γ-butyrolactone

Technical field:

The utility model relates to the technical field of fixed bed reactors, and more specifically to a tubular reactor for efficiently catalyzing acetylation to synthesize alpha-acetyl-gamma-butyrolactone.

Background technology:

α-acetyl-γ-butyrolactone is an important organic chemical raw material, an intermediate for preparing chlorophyll, and can also be used in the pharmaceutical industry to manufacture anti-angina drugs. It is a raw material for preparing vitamin B1, and can also synthesize 3,4-disubstituted pyridine and 5-(β-hydroxyethyl)-4-methylthiazole. It has a wide range of uses. At present, the synthesis process of α-acetyl-γ-butyrolactone uses γ-butyrolactone as the starting material, and methyl acetate is synthesized under the action of a new metal alkaline catalyst. The synthesis is carried out in a fixed bed reactor filled with a metal alkaline catalyst. There are many types of existing fixed bed reactors, among which the tube-in-tube fixed bed reactor is commonly used. The tube-in-tube refers to the heat exchange tube assembly part in the reactor, and the catalyst set in the reactor is filled between the heat exchange tubes of the heat exchange tube assembly, and the reactors above and below the catalyst are filled with porcelain balls; and the tube-in-tube fixed bed reactor needs to replace the catalyst regularly. The existing replacement method is to disassemble the reactor for replacement, but the replacement is more troublesome; therefore, it is necessary to develop a fixed bed reactor that is convenient for catalyst replacement.

Utility model content:

The purpose of the utility model is to address the deficiencies of the prior art and to provide a tubular reactor for efficiently catalyzing acetylation to synthesize α-acetyl-γ-butyrolactone. The structure of the tubular reactor facilitates the replacement of the catalyst filled therein, thereby improving the efficiency of the reactor.

A tubular reactor for efficiently catalyzing acetylation to synthesize α-acetyl-γ-butyrolactone, comprising a cylindrical ring-shaped reaction tank, the upper and lower ends of the reaction tank are respectively formed with heads, the top of the head at the upper end of the reaction tank is formed with a vertical reactant inlet, the head on one side of the reactant inlet is formed with an inclined loading port, the reaction tank is provided with a heat exchange component, the bottom of the head at the lower end of the reaction tank is provided with an opening, a bottom shell with an arc-shaped cross section is inserted in the opening, a reactant outlet is formed at the bottom end of the bottom shell, an arc-shaped connecting sleeve is formed on the outer wall of the upper end of the bottom shell, the connecting sleeve abuts against the outer wall of the head and is fixedly connected with a connecting ring with a D-shaped cross section, and the connecting ring is inserted on the outer wall of the head;

An umbrella-shaped baffle is fixedly connected to the inner side of the bottom shell, a plurality of through holes are formed in the middle of the baffle, an arc-shaped discharge port is formed on the side of one side of the baffle, an inclined unloading port is formed on the bottom shell directly below the discharge port, an arc-shaped guide plate is arranged between the unloading port and the reactant outlet, and the upper and lower sides of the guide plate are respectively fixed on the bottom shell and the baffle; a plurality of vertical partitions are abutted against the upper surface of the baffle around the through holes, and the partitions are respectively fixed on the inner wall of the lower end cover of the reaction tank.

Preferably, at least three partitions are provided, the partitions are evenly distributed in a ring shape around the central axis of the reaction tank, the lower surface of the partition is arc-shaped, and the lower surface of the partition and the upper surface of the baffle are on the same arc surface.

Preferably, the heat exchange assembly comprises a horizontal straight heat exchange outlet pipe and a heat exchange inlet pipe, which are respectively plugged and fixed on the pipe walls on both sides of the reaction tank, one end of the heat exchange inlet pipe is formed with an inner insert pipe, which is inserted into the heat exchange outlet pipe, and the end of the inner insert pipe is formed with a spherical first cover; one end of the heat exchange outlet pipe close to the heat exchange inlet pipe is sealed and fixedly connected to the heat exchange inlet pipe;

The two sides of the middle of the heat exchange outlet pipe are respectively fixedly connected with arc-shaped outer heat exchange ring pipes, the outer heat exchange ring pipe is connected with the heat exchange outlet pipe, an arc-shaped inner heat exchange ring pipe is inserted in the outer heat exchange ring pipe, and the two ends of the inner heat exchange ring pipe are fixed on the inner insert pipe and connected with the inner insert pipe;

The lower end of the outer wall of the middle part of the heat exchange outlet pipe and the lower end of the outer wall of the outer heat exchange ring pipe are respectively fixed with vertical heat exchange tubes, and the heat exchange tubes are respectively connected with the heat exchange outlet pipe and the outer heat exchange ring pipe. The lower end of the heat exchange tube is formed with a spherical second cover. A vertical guide tube is inserted in the heat exchange tube. The upper end of the guide tube is respectively fixed to the inner heat exchange ring pipe and the inner insert pipe and is respectively connected with the inner heat exchange ring pipe and the inner insert pipe.

Preferably, the central axis of the outer heat exchange ring tube, the central axis of the inner heat exchange ring tube and the central axis of the reaction tank are on the same straight line, and the heat exchange tubes are evenly distributed in a ring shape around the central axis of the reaction tank.

Preferably, the reaction tanks between the heat exchange tubes are filled with catalysts, and the reaction tanks above and below the catalysts are filled with ceramic balls.

Preferably, annular heat exchange channels are provided between the inner insert tube and the heat exchange outlet tube, between the inner heat exchange ring tube and the outer heat exchange ring tube, and between the flow guide tube and the heat exchange tube array.

The beneficial effects of the utility model are:

The structure of the tubular reactor facilitates the replacement of the catalyst filled therein without disassembling the reactor, thereby reducing the time required to stop the reaction due to catalyst replacement and improving the production efficiency of the reactor.

Description of the drawings:

FIG1 is a three-dimensional structural schematic diagram of the utility model;

FIG2 is a schematic diagram of the structure of the utility model from the front;

FIG3 is a schematic diagram of a half-section structure of the utility model in the front view direction;

Fig. 4 is a schematic cross-sectional view of the A-A position in Fig. 2 .

In the figure: 1. reaction tank; 2. heat exchange component; 3. bottom shell; 4. connecting ring; 5. baffle; 6. guide plate; 7. catalyst; 9. ceramic ball.

Specific implementation method:

Embodiment: As shown in Figures 1 to 4, a tubular reactor for efficiently catalyzing acetylation to synthesize α-acetyl-γ-butyrolactone comprises a cylindrical ring-shaped reaction tank 1, the upper and lower ends of the reaction tank 1 are respectively formed with a head 11, the top of the head 11 at the upper end of the reaction tank 1 is formed with a vertical reactant inlet 12, and the head 11 on one side of the reactant inlet 12 is formed with an inclined loading port 13, the reaction tank 1 is provided with a heat exchange component 2, the bottom of the head 11 at the lower end of the reaction tank 1 is provided with an opening, a bottom shell 3 with an arc-shaped cross section is inserted in the opening, a reactant outlet 31 is formed at the bottom end of the bottom shell 3, and an arc-shaped connecting sleeve 32 is formed on the outer wall of the upper end of the bottom shell 3, the connecting sleeve 32 abuts against the outer wall of the head 11 and is fixedly connected with a connecting ring 4 with a D-shaped cross section, the connecting ring 4 is inserted on the outer wall of the head 11, and the connecting ring 4 can rotate on the head 11;

An umbrella-shaped baffle 5 is fixedly connected to the inner side of the bottom shell 3, a plurality of through holes 51 are formed in the middle of the baffle 5, an arc-shaped discharge port 52 is formed on the side of one side of the baffle 5, an inclined discharge port 33 is formed on the bottom shell 3 directly below the discharge port 52, an arc-shaped guide plate 6 is provided between the discharge port 33 and the reactant outlet 31, and the upper and lower sides of the guide plate 6 are respectively fixed on the bottom shell 3 and the baffle 5; a plurality of vertical partitions 7 are abutted against the upper surface of the baffle 5 around the through holes 51, and the partitions 7 are respectively fixed on the inner wall of the lower end cover 11 of the reaction tank 1.

There are at least three partitions 7 , which are evenly distributed in a ring shape around the central axis of the reaction tank 1 , and the lower surface of the partition 7 is arc-shaped, and the lower surface of the partition 7 and the upper surface of the baffle 5 are on the same arc surface.

The heat exchange assembly 2 comprises a horizontal straight heat exchange outlet pipe 21 and a heat exchange inlet pipe 22, which are respectively plugged and fixed on the pipe walls on both sides of the reaction tank 1, and one end of the heat exchange inlet pipe 22 is formed with an inner insert pipe 221, which is inserted into the heat exchange outlet pipe 21, and the end of the inner insert pipe 221 is formed with a spherical first cover; one end of the heat exchange outlet pipe 21 close to the heat exchange inlet pipe 22 is sealed and fixedly connected to the heat exchange inlet pipe 22;

The two sides of the middle of the heat exchange outlet pipe 21 are respectively fixedly connected with arc-shaped outer heat exchange ring pipes 23, the outer heat exchange ring pipe 23 is connected with the heat exchange outlet pipe 21, and an arc-shaped inner heat exchange ring pipe 24 is inserted in the outer heat exchange ring pipe 23, and the two ends of the inner heat exchange ring pipe 24 are fixed on the inner insert pipe 221 and connected with the inner insert pipe 221;

The lower end of the outer wall of the middle part of the heat exchange outlet pipe 21 and the lower end of the outer wall of the outer heat exchange ring pipe 23 are respectively fixed with vertical heat exchange tubes 25, and the heat exchange tubes 25 are respectively connected with the heat exchange outlet pipe 21 and the outer heat exchange ring pipe 23. The lower end of the heat exchange tube 25 is formed with a spherical second cover 251. A vertical flow guide tube 26 is inserted into the heat exchange tube 25. The upper end of the flow guide tube 26 is respectively fixed to the inner heat exchange ring pipe 24 and the inner insert pipe 221 and is respectively connected with the inner heat exchange ring pipe 24 and the inner insert pipe 221.

The central axis of the outer heat exchange ring tube 23 , the central axis of the inner heat exchange ring tube 24 and the central axis of the reaction tank 1 are on the same straight line, and the heat exchange tubes 25 are evenly distributed in a ring shape around the central axis of the reaction tank 1 .

The reaction tank 1 between the heat exchange tubes 25 is filled with a catalyst 8, which is a metal alkaline catalyst. The reaction tank 1 on the upper and lower sides of the catalyst 8 is filled with ceramic balls 9. In actual process, the ceramic balls 9 at the bottom of the reaction tank 1 will also fill the space below the discharge port 52 on the baffle 5. However, in FIG. 3 , if the ceramic balls 9 are arranged in the space below the discharge port 52, the position of the discharge port 52 cannot be seen clearly, so some of the ceramic balls 9 are removed.

Annular heat exchange channels are provided between the inner insert tube 221 and the heat exchange outlet tube 21, between the inner heat exchange ring tube 24 and the outer heat exchange ring tube 23, and between the flow guide tube 26 and the heat exchange tube array 25.

The above-mentioned heat exchange component 2 is a jacketed tube structure. The flow direction of the heat exchange medium in the heat exchange component 2 is to enter from the heat exchange inlet pipe 22, flow to the inner insert pipe 221 and the inner heat exchange ring pipe 24, then enter the guide pipe 26, be output from the lower end of the guide pipe 26, and then enter the outer heat exchange ring pipe 23 or the heat exchange outlet pipe 21 through the heat exchange channel between the guide pipe 26 and the heat exchange tube 25. The heat exchange medium in the outer heat exchange ring pipe 23 finally flows to the heat exchange outlet pipe 21 and flows out through the heat exchange outlet pipe 21; the heat exchange process mainly occurs at the heat exchange tube 25.

Working principle: The utility model is a tubular reactor for efficiently catalyzing acetylation to synthesize α-acetyl-γ-butyrolactone. α-acetyl-γ-butyrolactone is obtained by efficient catalytic reaction of a metal alkaline catalyst in a reaction tank 1, and a heat exchange component 2 provides the temperature conditions required for the catalytic reaction; and the main technical point of the application is reflected in the structure of replacing the catalyst 8;

The main technical structure is the structure of the bottom shell 3. The bottom shell 3 is pivotally connected to the bottom of the reaction tank 1 through the connecting ring 4 and can be rotated. Covers are installed and connected on the loading port 13 and the unloading port 33. However, when the catalyst 8 needs to be replaced, the covers on the loading port 13 and the unloading port 33 are opened, and the ceramic balls 9 and the catalyst 8 will flow into the unloading port 33 through the discharge port 52 on the baffle 5 for discharge. Through the rotation of the bottom shell 3 and the separation and limitation of the partition 7, all the catalysts 8 and ceramic balls 9 can be discharged from the unloading port 33.

Finally, the cover of the unloading port 33 is closed, and the ceramic balls 9, the catalyst 8 and the ceramic balls 9 are poured in order through the loading port 13, thereby completing the replacement of the catalyst 8.

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 (6)

1. A tubular reactor for efficiently catalyzing acetylation to synthesize α-acetyl-γ-butyrolactone, comprising a cylindrical ring-shaped reaction tank (1), wherein the upper and lower ends of the reaction tank (1) are respectively formed with a head (11), a vertical reactant inlet (12) is formed on the top of the head (11) at the upper end of the reaction tank (1), and an inclined loading port (13) is formed on the head (11) on one side of the reactant inlet (12), and the reaction tank (1) is provided with a heat exchange component (2), characterized in that: an opening is provided at the bottom of the sealing head (11) at the lower end of the reaction tank (1), a bottom shell (3) with an arc-shaped cross section is inserted in the opening, a reactant outlet (31) is formed at the bottom end of the bottom shell (3), an arc-shaped connecting sleeve (32) is formed on the outer wall of the upper end of the bottom shell (3), the connecting sleeve (32) abuts against the outer wall of the sealing head (11) and is fixedly connected to a connecting ring (4) with a D-shaped cross section, and the connecting ring (4) is inserted on the outer wall of the sealing head (11); An umbrella-shaped baffle (5) is fixedly connected to the inner side of the bottom shell (3), a plurality of through holes (51) are formed in the middle of the baffle (5), an arc-shaped discharge port (52) is formed on the side of one side of the baffle (5), an oblique discharge port (33) is formed on the bottom shell (3) directly below the discharge port (52), an arc-shaped guide plate (6) is provided between the discharge port (33) and the reactant outlet (31), and the upper and lower sides of the guide plate (6) are respectively fixed on the bottom shell (3) and the baffle (5); a plurality of vertical partitions (7) are abutted against the upper surface of the baffle (5) around the through holes (51), and the partitions (7) are respectively fixed on the inner wall of the lower end cover (11) of the reaction tank (1). 2. A tubular reactor for efficiently catalyzing acetylation to synthesize α-acetyl-γ-butyrolactone according to claim 1, characterized in that: there are at least three partitions (7), the partitions (7) are evenly distributed in a ring shape around the central axis of the reaction tank (1), the lower surface of the partition (7) is arc-shaped, and the lower surface of the partition (7) and the upper surface of the baffle (5) are on the same arc surface. 3. A tubular reactor for efficiently catalytically acetylated synthesis of α-acetyl-γ-butyrolactone according to claim 1, characterized in that: the heat exchange assembly (2) comprises a horizontal straight heat exchange outlet pipe (21) and a heat exchange inlet pipe (22), the heat exchange outlet pipe (21) and the heat exchange inlet pipe (22) are respectively plugged and fixed on the pipe walls on both sides of the reaction tank (1), one end of the heat exchange inlet pipe (22) is formed with an inner insert pipe (221), the inner insert pipe (221) is inserted in the heat exchange outlet pipe (21), and the end of the inner insert pipe (221) is formed with a spherical first cover; one end of the heat exchange outlet pipe (21) close to the heat exchange inlet pipe (22) is sealed and fixedly connected to the heat exchange inlet pipe (22); An arc-shaped outer heat exchange ring tube (23) is fixedly connected to both sides of the middle of the heat exchange outlet tube (21), the outer heat exchange ring tube (23) is connected to the heat exchange outlet tube (21), an arc-shaped inner heat exchange ring tube (24) is inserted into the outer heat exchange ring tube (23), and both ends of the inner heat exchange ring tube (24) are fixed on the inner insert tube (221) and are connected to the inner insert tube (221); A vertical heat exchange tube (25) is fixedly connected to the lower end of the outer wall of the middle part of the heat exchange outlet tube (21) and the lower end of the outer wall of the outer heat exchange ring tube (23), respectively. The heat exchange tube (25) is connected to the heat exchange outlet tube (21) and the outer heat exchange ring tube (23), respectively. A spherical second cover (251) is formed at the lower end of the heat exchange tube (25). A vertical flow guide tube (26) is inserted into the heat exchange tube (25), and the upper end of the flow guide tube (26) is fixedly connected to the inner heat exchange ring tube (24) and the inner insert tube (221), respectively, and is connected to the inner heat exchange ring tube (24) and the inner insert tube (221), respectively. 4. A shell-and-tube reactor for efficiently catalyzing acetylation to synthesize α-acetyl-γ-butyrolactone according to claim 3, characterized in that the central axis of the outer heat exchange ring tube (23), the central axis of the inner heat exchange ring tube (24) and the central axis of the reaction tank (1) are on the same straight line, and the heat exchange tubes (25) are evenly distributed in a ring shape around the central axis of the reaction tank (1). 5. A shell-and-tube reactor for efficiently catalytic acetylation to synthesize α-acetyl-γ-butyrolactone according to claim 3, characterized in that the reaction tank (1) between the heat exchange tubes (25) is filled with a catalyst (8), and the reaction tanks (1) above and below the catalyst (8) are filled with porcelain balls (9). 6. A shell-and-tube reactor for efficiently catalytic acetylation to synthesize α-acetyl-γ-butyrolactone according to claim 3, characterized in that annular heat exchange channels are provided between the inner insert tube (221) and the heat exchange outlet tube (21), between the inner heat exchange ring tube (24) and the outer heat exchange ring tube (23), and between the guide tube (26) and the heat exchange shell and tube (25).