Resource utilization reaction device for iodine and acetaldehyde

Abstract

The utility model discloses a resource utilization reaction device for iodine and acetaldehyde. The reactor comprises a reactor cylinder of a horizontal structure, a stirring shaft arranged in the reactor cylinder and a power device located on one side of the reactor cylinder, a plurality of stirring paddles are arranged on the stirring shaft, and baffles located between the adjacent stirring paddles are further installed on the stirring shaft. The interior of the reactor barrel is divided into a plurality of cavities with the same volume through the baffles, a multi-kettle series connection structure is formed, and a feeding pipe and a discharging pipe are arranged on the reactor barrel. The reactor has the advantages that in the reaction process, the reactor barrel can be filled with materials, so that the problem of desublimation of elemental iodine in the upper cavity of the reactor is effectively avoided; the reactor barrel is divided into a plurality of equal-volume cavities to form a multi-kettle series connection structure, the flow pattern of materials in the reactor is close to plug flow, the reactor is suitable for iodine conversion and acetaldehyde conversion reactions, and the conversion rate is promoted to be increased; the wall adhesion of the iodine elementary substance generated in the iodine conversion reaction process can be prevented, and the discharge of the iodine elementary substance is facilitated.

Description

Technical Field

[0001] The utility model relates to a reaction device for industrial production of acetic acid, in particular to a reaction device for resource utilization of iodine and acetaldehyde in acetic acid waste liquid. Background Art

[0002] The industrial production method of acetic acid is mainly based on the methanol carbonylation process, which uses methanol and CO as raw materials, rhodium chloride as catalyst, and methyl iodide as co-catalyst to synthesize crude acetic acid under the conditions of 2.5~3 MPa and 180~190℃, and then obtains the finished acetic acid after purification through a distillation process. During the production process, a certain amount of I-containing - and acetic acid waste liquid containing acetaldehyde.

[0003] At present, the industry mainly uses incineration to treat acetic acid waste liquid. However, iodine cannot be converted during the incineration process, forming purple smoke, and acetaldehyde is not easy to burn completely, producing a pungent odor, which not only causes greater environmental pollution, but also is a waste of resources.

[0004] At present, a Chinese invention patent application with the publication number CN113636687A and the name of the resource utilization process of high-value chemicals in acetic acid plant wastewater has been published; the patent application document records the technical solution of converting iodide in acetic acid production wastewater into elemental iodine through an iodide conversion unit, and then separating the elemental iodine from the acetic acid production wastewater through a solid-liquid separation system; converting acetaldehyde in acetic acid production wastewater into acetic acid through an acetaldehyde conversion unit, and then extracting the acetic acid through a purification system. This technical solution can effectively solve the above technical problems, but its equipment is complex, difficult to operate, and has high energy consumption. In addition, due to the structural design defects of the vertical reactor, during the production process, the elemental iodine is easily condensed in the upper cavity of the reactor. At the same time, it is difficult for the simple processing equipment to fully react the iodine conversion and the acetaldehyde conversion, and the conversion efficiency is low. In addition, the elemental iodine generated during the iodine conversion reaction will adhere to the wall and is difficult to discharge. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a method for producing acetic acid waste liquid with simple operation, low energy consumption and - A resource utilization reaction device for iodine and acetaldehyde that efficiently converts iodine into elemental iodine and acetaldehyde into acetaldehyde.

[0006] In order to solve the above technical problems, the utility model discloses a reaction device for resource utilization of iodine and acetaldehyde, comprising a reactor cylinder with a horizontal structure, a stirring shaft arranged in the reactor cylinder, and a power device located on one side of the reactor cylinder and used to drive the stirring shaft to rotate. A plurality of stirring paddles for stirring the material are arranged on the stirring shaft, and a baffle located between adjacent stirring paddles is also installed on the stirring shaft. The inner part of the reactor cylinder is divided into a plurality of equal-volume cavities by the baffles to form a multi-reactor series structure, and a feed pipe and a discharge pipe are arranged on the reactor cylinder.

[0007] The stirring paddle is a Brumakin-type stirring paddle and the diameter of the stirring paddle is 2 to 5 cm smaller than the inner diameter of the reactor cylinder.

[0008] A jacket is arranged outside the reactor cylinder, and the material in the reactor cylinder is heated or cooled by filling the jacket with a circulating medium.

[0009] The baffle is one of a circular baffle and a porous baffle.

[0010] The power device comprises a motor and a reducer connected to the motor, and the reducer is connected to the stirring shaft through a coupling.

[0011] A left end cover flange and a right end cover flange are respectively installed at the left and right ends of the reactor cylinder, and the stirring shaft is supported and installed in the reactor cylinder through the left end cover flange and the right end cover flange.

[0012] The outer sides of the left end cover flange and the right end cover flange are both provided with a No. 1 mechanical seal and a No. 2 mechanical seal for sealing the stirring shaft.

[0013] The feed pipe and the discharge pipe are both arranged on opposite sides of the power device.

[0014] The advantages of the utility model are:

[0015] (1) A horizontal reactor cylinder is used. During the reaction process, the material can fill the reactor cylinder, thereby effectively avoiding the condensation of iodine in the upper cavity of the reactor.

[0016] (2) By installing multiple baffles between adjacent stirring paddles on the stirring shaft, the reactor cylinder is divided into multiple equal-volume cavities to form a multi-reactor series structure. The flow pattern of the material in the reactor is close to plug flow, which is suitable for iodine conversion and acetaldehyde conversion reactions and promotes the improvement of the conversion rate.

[0017] (3) The use of a Brumakin-type stirring impeller with a blade diameter 2 to 5 cm smaller than the inner diameter of the reactor cylinder can prevent the iodine element generated during the iodine conversion reaction from adhering to the wall and also facilitate its discharge.

[0018] (4) The whole structure is simple in design, easy to operate and use, and the reasonable structural design enables it to achieve high conversion efficiency with extremely low energy consumption, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic diagram of the structure of the iodine and acetaldehyde resource utilization reaction device. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the iodine and acetaldehyde resource utilization reaction device of the utility model in conjunction with the accompanying drawings and specific implementation methods.

[0021] As shown in the figure, the iodine and acetaldehyde resource utilization reaction device of the utility model includes a reactor cylinder 6 with a horizontal structure, a stirring shaft 9 arranged in the reactor cylinder, and a power device located on one side of the reactor cylinder 6 and used to drive the stirring shaft 9 to rotate. It can be seen from the figure that a left end cover flange 5 is installed at the left end of the reactor cylinder 6, and a right end cover flange 12 is installed at the right end of the reactor cylinder 6. The main part of the stirring shaft 9 is located in the reactor cylinder, and the two ends of the stirring shaft 9 extend out of the left and right sides of the reactor cylinder respectively and are supported by the left end cover flange 5 and the right end cover flange 12 (of course, the left end cover flange 5 and the right end cover flange 12 must have bearings for matching and installing with the stirring shaft 9). The power device includes a motor 1 and a motor connected to the motor 1. The reducer 2 is connected to the left end of the stirring shaft 9 through a coupling 3. A plurality of stirring paddles 8 for stirring the material are arranged on the stirring shaft 9. The stirring shaft 9 is also provided with baffles 7 located between adjacent stirring paddles 8. The inner part of the reactor cylinder is divided into a plurality of equal-volume cavities by each baffle 7 to form a multi-reactor series structure. A feed pipe 10 and a discharge pipe 11 are provided on the reactor cylinder 6. The feed pipe 10 and the discharge pipe 11 are both arranged on opposite sides of the power device (in this embodiment, the power device is arranged at the left end of the reactor cylinder 6, and the feed pipe 10 and the discharge pipe 11 are both arranged at the right ends of the feed pipe 10 and the discharge pipe 11). During the reaction process, the material enters the reactor through the feed pipe 10, and the reacted material flows out of the reactor through the discharge pipe 11.

[0022] Furthermore, the stirring paddle 8 is a Brumakin-type stirring paddle and the diameter of the stirring paddle 8 is 2 to 5 cm smaller than the inner diameter of the reactor barrel 6. In this embodiment, the paddle diameter is 19 cm, the inner diameter of the reactor barrel 6 is 23 cm, and the length of the reactor barrel 6 is 100 cm; the baffle 7 is one of a circular baffle or a porous baffle, wherein when a circular baffle is selected, the cut-off bow height is approximately 10% of the baffle diameter.

[0023] Furthermore, a jacket may be provided outside the reactor cylinder 6, and the material in the reactor cylinder 6 may be heated or cooled by filling the jacket with a circulating medium.

[0024] Furthermore, in order to improve the sealing effect, a No. 1 mechanical seal 4 for sealing the left end of the stirring shaft can be provided at the outer end of the left end cover flange 5, and a No. 2 mechanical seal 13 for sealing the right end of the stirring shaft can be provided at the outer end of the right end cover flange 12.

[0025] The working and usage process is as follows:

[0026] (1) Adding a circulating ethylene glycol aqueous solution into the jacket outside the reactor cylinder 6, and controlling the temperature inside the reactor cylinder 6 to be between 10 and 25° C.;

[0027] (2) injecting acetic acid waste liquid and hydrogen peroxide into the reactor barrel 6 through the feed pipe 10, wherein the flow rate of the acetic acid waste liquid is 10 kg / h, the flow rate of the hydrogen peroxide is 7.7 kg / h, the mass fraction of I in the acetic acid waste liquid is 0.5-2%, and the mass concentration of the hydrogen peroxide is 30%;

[0028] (3) When the reactor cylinder 6 is filled with materials, start the motor 1 and control the stirring speed to 120 rpm;

[0029] (4) The acetic acid waste liquid after the reaction is collected through the discharge pipe 11 and enters the downstream solid-liquid separator;

[0030] (5) After the reaction is completed, the feed of acetic acid waste liquid and hydrogen peroxide is turned off, the motor 1 is turned off, and the circulating cooling outside the reactor cylinder 6 is turned off.

[0031] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A reaction device for resource utilization of iodine and acetaldehyde, characterized in that: The invention comprises a reactor cylinder (6) of a horizontal structure, a stirring shaft (9) arranged in the reactor cylinder, and a power device located on one side of the reactor cylinder (6) and used to drive the stirring shaft (9) to rotate. The stirring shaft (9) is provided with a plurality of stirring paddles (8) for stirring materials. The stirring shaft (9) is also provided with baffles (7) located between adjacent stirring paddles (8). The inner part of the reactor cylinder is divided into a plurality of equal-volume cavities by each of the baffles (7) to form a multi-reactor series structure. The reactor cylinder (6) is provided with a feed pipe (10) and a discharge pipe (11).

2. The resource utilization reaction device of iodine and acetaldehyde according to claim 1, characterized in that: The stirring paddle (8) is a Brumakin-type stirring paddle and the diameter of the stirring paddle (8) is 2 to 5 cm smaller than the inner diameter of the reactor barrel (6).

3. The resource utilization reaction device of iodine and acetaldehyde according to claim 1 or 2, characterized in that: The reactor cylinder (6) is provided with a jacket outside, and the material in the reactor cylinder (6) is heated or cooled by filling the jacket with a circulating medium.

4. The resource utilization reaction device of iodine and acetaldehyde according to claim 3, characterized in that: The baffle (7) is one of a circular segment baffle and a porous baffle.

5. The resource utilization reaction device of iodine and acetaldehyde according to claim 1, 2 or 4, characterized in that: The power device comprises a motor (1) and a reducer (2) connected to the motor (1); the reducer (2) is connected to a stirring shaft (9) via a coupling (3).

6. The iodine and acetaldehyde resource utilization reaction device according to claim 5, characterized in that: A left end cover flange (5) and a right end cover flange (12) are respectively installed at the left and right ends of the reactor barrel (6), and the stirring shaft (9) is supported and installed in the reactor barrel (6) through the left end cover flange (5) and the right end cover flange (12).

7. The resource utilization reaction device of iodine and acetaldehyde according to claim 6, characterized in that: The outer ends of the left end cover flange (5) and the right end cover flange (12) are both provided with a first mechanical seal (4) and a second mechanical seal (13) for sealing the stirring shaft.

8. The iodine and acetaldehyde resource utilization reaction device according to claim 7, characterized in that: The feed pipe (10) and the discharge pipe (11) are both arranged on opposite sides of the power device.

Images