Oxidation kettle

Abstract

The utility model provides an oxidation kettle. The oxidation kettle comprises a kettle body, a backflow exhaust pipe and an aeration pipe, wherein the backflow exhaust pipe and the aeration pipe are arranged in the kettle body; an exhaust port is formed in the top of the kettle body; the backflow exhaust pipe comprises a spiral pipe and a flared pipe, the pipe diameter of the flared pipe is increased from the bottom end to the top end, the top end of the flared pipe is connected to the lower portion of the exhaust port, the top end of the spiral pipe is connected to the bottom end of the flared pipe, and the spiral pipe extends in the height direction; the aeration pipe is arranged at the bottom in the kettle body. According to the oxidation kettle provided by the utility model, oxidation reaction is carried out in the kettle body and waste gas is generated, the flow speed is reduced after the waste gas carries reaction liquid to enter the backflow exhaust pipe, and carried reaction liquid particles can flow back into the kettle body, so that the material waste is reduced, and the waste gas treatment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to an oxidation kettle. Background Art

[0002] Glyoxylic acid is an important organic chemical intermediate, which is widely used in the fields of spices, medicine, paint, papermaking, fine chemicals, etc. It is an important organic chemical intermediate.

[0003] Glyoxylic acid can be produced by the ozone oxidation of maleic anhydride method. During the oxidation reaction stage, ozone gas is introduced from the bottom of the reaction liquid, reacts with maleic acid to generate glyoxylic acid and a large amount of carbon dioxide. In addition, about 80% of the oxygen in the ozone gas does not participate in the reaction and will overflow from the reaction liquid together with the carbon dioxide. Due to the large gas flow rate, a small part of the reaction liquid will be entrained and carried out, resulting in material waste, and the volatile organic matter in the reaction exhaust gas is difficult to handle. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model provides an oxidation kettle.

[0005] The utility model provides an oxidation kettle, comprising:

[0006] A kettle body, wherein the top of the kettle body is provided with an exhaust port;

[0007] A reflux exhaust pipe, the reflux exhaust pipe comprising a spiral pipe and an expanded pipe, the expanded pipe having a diameter increasing from the bottom end to the top end, the top end of the expanded pipe being connected below the exhaust port, the top end of the spiral pipe being connected to the bottom end of the expanded pipe, and the spiral pipe extending in a height direction;

[0008] An aeration pipe is arranged at the bottom of the kettle body.

[0009] In one embodiment of the utility model, a plurality of vertically extending guide vanes are arranged on the inner wall of the expanded tube, and the plurality of guide vanes extend toward the center line of the expanded tube.

[0010] In one embodiment of the utility model, a plurality of exhaust ports are provided on the top of the kettle body, and a plurality of reflux exhaust pipes are provided and are respectively connected to the corresponding exhaust ports.

[0011] In one embodiment of the present invention, the aeration pipe is coiled at the bottom of the kettle body.

[0012] In one embodiment of the present invention, a stirring device is provided in the kettle.

[0013] One beneficial effect of the utility model is that the utility model provides an oxidation kettle comprising a kettle body and a reflux exhaust pipe and an aeration pipe arranged in the kettle body, the aeration pipe being used to introduce ozone gas into the maleic acid in the kettle body to perform an oxidation reaction to generate glyoxylic acid and generate waste gas; the waste gas can carry the reaction liquid into the reflux exhaust pipe for discharge, and the waste gas passes through the spiral tube and the expanded tube of the reflux exhaust pipe in sequence, the spiral tube can extend the flow path of the waste gas, increase the resistance, and reduce the flow speed of the waste gas, because the bottom end diameter of the expanded tube is smaller than the top end diameter, the flow speed of the waste gas is further slowed down when it flows from the bottom end of the expanded tube to the top end, and it is difficult to carry the reaction liquid particles, and the reaction liquid particles can adhere to the inner walls of the spiral tube and the expanded tube, condense into droplets, and then flow back into the kettle body under the action of gravity, thereby reducing material waste, and the content of volatile organic components in the discharged waste gas is greatly reduced, which greatly improves the waste gas treatment efficiency and reduces the waste gas treatment cost.

[0014] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0016] Figure 1 It is a schematic diagram of the overall structure of the oxidation kettle provided by the utility model;

[0017] Figure 2 It is a structural schematic diagram of the reflux exhaust pipe of the oxidation kettle provided by the utility model;

[0018] Figure 3 It is a top view of the expanded tube of the oxidation kettle provided by the utility model;

[0019] Figure 4 It is a top view of the aeration pipe of the oxidation kettle provided by the utility model.

[0020] Figures 1 to 4 The one-to-one correspondence between the component names and the reference numerals is as follows:

[0021] 1. Kettle body; 11. Exhaust port;

[0022] 2. Reflux exhaust pipe; 21. Spiral pipe; 22. Expanded pipe; 221. Guide vane;

[0023] 3. Aeration pipe;

[0024] 4. Stirring device. DETAILED DESCRIPTION

[0025] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0026] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0027] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0028] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0029] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0030] In this article, "first", "second", etc. are only used to distinguish each other, and do not indicate the importance and order, or the premise of each other's existence.

[0031] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0032] As used herein, unless otherwise specified, "plurality" means two or more.

[0033] Figures 1 to 4 An oxidation kettle provided by the utility model is shown, comprising a kettle body 1, and a reflux exhaust pipe 2 and an aeration pipe 3 arranged in the kettle body 1.

[0034] The top of the kettle body 1 is provided with an exhaust port 11. The reflux exhaust pipe 2 includes a spiral pipe 21 and an expanded pipe 22. The expanded pipe 22 has a diameter increasing from the bottom end to the top end. The top end of the expanded pipe 22 is connected below the exhaust port 11. The top end of the spiral pipe 21 is connected to the bottom end of the expanded pipe 22. The spiral pipe 21 extends in the height direction. The aeration pipe 3 is arranged at the bottom of the kettle body 1.

[0035] The oxidation kettle provided by the utility model is used to prepare glyoxylic acid by ozone oxidation of maleic anhydride. The aeration pipe 3 is used to introduce ozone gas into the maleic anhydride in the kettle body 1 to perform an oxidation reaction to generate glyoxylic acid and produce a large amount of carbon dioxide. Carbon dioxide and part of the oxygen in the ozone gas overflow from the reaction liquid to form waste gas. The waste gas can carry the reaction liquid into the reflux exhaust pipe 2 and then be discharged through the exhaust port 11. The exhaust port 11 can be connected to the waste gas treatment device through a pipeline, and harmful substances in the waste gas are removed by the waste gas treatment device.

[0036] The exhaust gas passes through the spiral tube 21 and the expanded tube 22 of the reflux exhaust pipe 2 in sequence. The spiral tube 21 can extend the flow path of the exhaust gas, increase resistance, and reduce the flow speed of the exhaust gas. The reaction liquid particles carried by the exhaust gas can adhere to the inner wall of the spiral tube 21, condense into droplets, and then flow back to the kettle body 1 along the spiral tube 21 under the action of gravity. The exhaust gas enters the expanded tube 22 through the spiral tube 21. Since the bottom diameter of the expanded tube 22 is smaller than the top diameter, the flow speed of the exhaust gas is further slowed down when it flows from the bottom end of the expanded tube 22 to the top end. At this time, the flow rate of the exhaust gas is difficult to carry the reaction liquid particles. The remaining reaction liquid particles can adhere to the inner wall of the expanded tube 22, condense into droplets, and then flow into the spiral tube 21 below, and then flow back to the kettle body 1 through the spiral tube 21.

[0037] The reaction liquid carried by the exhaust gas directly flows back into the kettle body 1 after passing through the reflux exhaust pipe 2. The exhaust gas does not need to be additionally treated by a condensing device, thereby reducing material waste. In addition, since the reaction liquid particles in the exhaust gas are recovered, the content of volatile organic matter in the exhaust gas is greatly reduced, thereby greatly improving the exhaust gas treatment efficiency and reducing the exhaust gas treatment cost.

[0038] Specifically, Figure 2 and Figure 3 As shown, a plurality of vertically extending guide vanes 221 are provided on the inner wall of the expanded tube 22, and the plurality of guide vanes 221 extend toward the center line of the expanded tube 22. The guide vanes 221 can increase the inner wall area of ​​the expanded tube 22, so that more particles of the reaction liquid in the exhaust gas can adhere to the inner wall. Since the guide vanes 221 extend vertically, the droplets attached to the guide vanes 221 can quickly slide down into the spiral tube 21.

[0039] The plurality of guide plates 221 are all configured as thin sheet structures, which can reduce the space occupied in the expansion pipe 22 and ensure the expansion pipe 22 has the effect of reducing the exhaust gas flow rate.

[0040] There can be multiple exhaust ports 11 on the top of the kettle body 1, and correspondingly, there are also multiple reflux exhaust pipes 2, which are respectively connected to the corresponding exhaust ports 11. Increasing the number of exhaust ports 11 and reflux exhaust pipes 2 is conducive to improving the waste gas treatment efficiency.

[0041] To facilitate cleaning of the reflux exhaust pipe 2, the flared pipe 22 is detachably connected to the top of the kettle body 1 by threaded connection, fastener connection, etc. After a period of use, the reflux exhaust pipe 2 can be disassembled for flushing to avoid clogging.

[0042] The aeration pipe 3 is wound at the bottom of the kettle body 1. Specifically, the aeration pipe 3 can be wound in a spiral shape at the bottom of the kettle body 1. A pipeline for conveying the reaction gas extends into the kettle body 1 and connects to the aeration pipe 3. The reaction gas escapes in the form of bubbles through the aeration pipe 3 and fully reacts with the reaction liquid in the kettle body 1.

[0043] Furthermore, a stirring device 4 may be provided in the kettle body 1. The stirring device 4 includes a stirrer and a driving motor, the driving motor being provided at the top of the kettle body 1, the top end of the stirrer being connected to the output shaft of the driving motor, and the bottom end being provided with stirring blades, which extend into the reaction liquid in the kettle body 1. The driving motor drives the stirrer to rotate around its own axis, stirs the reaction liquid, and accelerates the efficiency of the oxidation reaction.

[0044] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present invention is defined by the appended claims.

Claims

1. An oxidation kettle, characterized in that: include: A kettle body, wherein the top of the kettle body is provided with an exhaust port; A reflux exhaust pipe, the reflux exhaust pipe comprising a spiral pipe and an expanded pipe, the expanded pipe having a diameter increasing from the bottom end to the top end, the top end of the expanded pipe being connected below the exhaust port, the top end of the spiral pipe being connected to the bottom end of the expanded pipe, and the spiral pipe extending in a height direction; An aeration pipe is arranged at the bottom of the kettle body.

2. The oxidation kettle according to claim 1, characterized in that: A plurality of vertically extending guide plates are arranged on the inner wall of the expanded tube, and the plurality of guide plates extend toward the center line of the expanded tube.

3. The oxidation kettle according to claim 1, characterized in that: The top of the kettle body is provided with a plurality of exhaust ports, and the reflux exhaust pipes are provided with a plurality of exhaust ports respectively connected with the corresponding exhaust ports.

4. The oxidation kettle according to claim 1, characterized in that: The aeration pipe is coiled at the bottom of the kettle body.

5. The oxidation kettle according to claim 1, characterized in that: A stirring device is arranged in the kettle body.

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