Device for preparing glyoxylic acid
By setting up a foam absorption and defoaming treatment system in the glyoxylic acid preparation device, the problem of foam affecting the reaction is solved, the product purity and efficiency are improved, and the safety risks are reduced, and the recycling and heat management of foam is realized.
Patent Information
- Application Number
- CN202421082745.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-17
AI Technical Summary
During the preparation of glyoxylic acid, the foam produced by the reaction of cisic acid and ozone affects the oxidation reaction process, resulting in a decrease in product purity and efficiency, and there are safety hazards. The prior art treats foam by increasing the pressure in the reactor but increases unsafety risk.
A device including a reactor, a foam treatment tank and a coolant circulation treatment mechanism is designed. The foam absorbing mechanism is used to absorb the foam in the reactor and process it through the defoaming mechanism and the heat exchange coil, and cool down and return to the reactor. , realize the recycling of foam and reduce the reaction heat.
It improves the preparation efficiency and purity of glyoxylic acid products, reduces the heat in the reactor, reduces the risk of raw material waste and environmental pollution, and enhances safety.
Smart Images
Figure CN222287274U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical product preparation, in particular to a preparation technology of glyoxylic acid, and more particularly to a device for preparing glyoxylic acid. 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. Using cis-acid as a raw material and ozone gas as an oxidant, glyoxylic acid is prepared by oxidation reaction, and a glyoxylic acid product with high purity can be obtained. Therefore, it is a common technology for preparing glyoxylic acid. When preparing glyoxylic acid, foam is generated when cis-acid and ozone are oxidized in a reactor. The presence of foam will affect the oxidation reaction process, and then affect the speed and purity of preparing glyoxylic acid. If there are more foams, foam will also occur in the tank, which will not only cause a waste of raw materials, but also pollute the environment, cause safety accidents, etc. In the prior art, in order to eliminate the foam in the foam reactor, the processing method of suppressing the foam by increasing the pressure in the reactor is usually used. Although this method can avoid the foam from bubbling up in the tank to a certain extent, it will still affect the oxidation reaction process, and the pressure in the reactor is too high, which increases the risk of unsafety. Summary of the invention
[0003] The utility model aims to provide a device for preparing glyoxylic acid, which can effectively recover and utilize the foam generated in the process of synthesizing glyoxylic acid by oxidation reaction, thereby improving the efficiency of product preparation and the purity of the product.
[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0005] A device for preparing glyoxylic acid, comprising:
[0006] A reactor, wherein a raw material inlet, an ozone inlet and a reactant outlet are arranged on the reactor wall, an aeration plate and a stirring mechanism are arranged inside the reactor, the aeration plate is located below the stirring mechanism, and the ozone introduced from the ozone inlet reacts with the raw material introduced from the raw material inlet after being aerated by the aeration plate; a foam outlet and a liquid return port are also arranged on the reactor wall of the reactor, and a foam absorption mechanism is also arranged inside the reactor, one end of the foam absorption mechanism is connected to the foam outlet, and the other end is located inside the reactor;
[0007] A foam treatment tank, wherein a foam inlet, a liquid outlet, a tank cooling liquid inlet, and a tank cooling liquid outlet are arranged on the tank wall, wherein the foam inlet is connected to the foam outlet, and the liquid outlet is connected to the liquid return port; a defoaming mechanism and a first heat exchange coil are arranged in the foam treatment tank, wherein one end of the first heat exchange coil is connected to the tank cooling liquid inlet, and the other end is connected to the tank cooling liquid outlet;
[0008] A pump body, which is connected to the reaction kettle and the foam treatment tank respectively;
[0009] The cooling liquid circulation processing mechanism is respectively connected with the cooling liquid inlet of the tank body and the cooling liquid outlet of the tank body.
[0010] In some embodiments of the present application, a spray mechanism is further provided in the reactor, the spray mechanism is located above the foam absorption mechanism, and the spray mechanism is connected to the liquid return port.
[0011] In some embodiments of the present application, the spray mechanism includes:
[0012] A primary spray sub-mechanism, which is close to the liquid return port and includes a spray head, and the spray head is connected to the liquid return port;
[0013] The secondary spray sub-mechanism is located below the primary spray sub-mechanism and comprises a liquid collecting box with a plurality of nozzles formed at the bottom thereof.
[0014] In some embodiments of the present application, the foam absorption mechanism includes a foam absorption head and a connecting tube, the connecting tube is respectively connected to the foam absorption head and the foam outlet, and the foam absorption head is a mesh structure.
[0015] In some embodiments of the present application, the defoaming mechanism is an ultrasonic generator.
[0016] In some embodiments of the present application, the reactor further comprises a jacket, the jacket is provided with a jacket coolant inlet and a jacket coolant outlet, and the coolant circulation treatment mechanism is also respectively connected to the jacket coolant inlet and the jacket coolant outlet.
[0017] In some embodiments of the present application, a kettle body cooling liquid inlet and a kettle body cooling liquid outlet are further provided on the kettle wall of the reactor, and a second heat exchange coil is also provided in the reactor, one end of the second heat exchange coil is connected to the kettle body cooling liquid inlet, and the other end is connected to the kettle body cooling liquid outlet, and the cooling liquid circulation processing mechanism is also respectively connected to the kettle body cooling liquid inlet and the kettle body cooling liquid outlet.
[0018] Compared with the prior art, the advantages and positive effects of the utility model are:
[0019] The utility model provides a device for preparing glyoxylic acid, comprising a reactor, a foam treatment tank, a pump body and a cooling liquid circulation treatment mechanism. A foam absorption mechanism is arranged in the reactor, a defoaming mechanism and a first heat exchange coil connected with the cooling liquid circulation treatment mechanism are arranged in the foam treatment tank. Under the power action of the pump body, the foam absorption mechanism is used to absorb the foam generated in the reactor and transport it to the foam treatment tank, and the defoaming mechanism is used to perform defoaming treatment to form liquid. While the defoaming treatment is performed in the foam treatment tank, the first heat exchange coil is used to perform cooling treatment on the foam and / or liquid, so as to reduce the heat generated by the reaction and accelerate the defoaming of the foam. The cooled liquid is returned to the reactor through the liquid return port of the reactor, so as to realize the recycling of the foam, reduce the reaction heat in the reactor, improve the reaction efficiency in the reactor, and thus improve the efficiency of preparing the glyoxylic acid product and the purity of the product.
[0020] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, a brief introduction will be given below to the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0022] Figure 1 The utility model is a schematic structural diagram of an embodiment of a device for preparing glyoxylic acid.
[0023] In the accompanying drawings, the reference numerals and their corresponding component names are as follows:
[0024] 1. Reactor;
[0025] 101, raw material inlet; 102, ozone inlet; 103, reactant outlet; 104, aeration plate; 105, stirring mechanism; 106, foam absorption mechanism; 1061, foam absorption head; 1062, connecting pipe; 107, foam outlet; 108, liquid return port; 109, spray mechanism; 1091, spray head; 1092, liquid collecting box; 1093, nozzle; 110, jacket; 111, jacket coolant inlet; 112, jacket coolant outlet; 113, kettle coolant inlet; 114, kettle coolant outlet; 115, second heat exchange coil;
[0026] 2. Foam treatment tank;
[0027] 21. Foam inlet; 22. Liquid outlet; 23. Tank coolant inlet; 24. Tank coolant outlet; 25. Defoaming mechanism; 26. First heat exchange coil;
[0028] 3. Pump body;
[0029] 4. Coolant circulation treatment mechanism. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0031] It should be noted that, in the description of the present invention, terms such as "top", "bottom", "inside", "outside", "upper", "lower" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.
[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0033] In the present invention, unless otherwise clearly defined and specified, the term "connection" should be understood in a broad sense, for example, "connection" can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0034] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0035] Figure 1 The schematic diagram of the structure of an embodiment of the device for preparing glyoxylic acid of the utility model is shown.
[0036] like Figure 1 As shown, in this embodiment, the device for preparing glyoxylic acid includes a reaction kettle 1, a foam treatment tank 2, a pump body 3 and a cooling liquid circulation treatment mechanism 4.
[0037] The reactor wall of the reactor 1 is provided with a raw material inlet 101, an ozone inlet 102 and a reactant outlet 103. The raw material inlet 101 is generally provided at the top of the reactor 1, and the reactant outlet 103 is generally provided at the bottom of the reactor 1. An aeration plate 104 and a stirring mechanism 105 are provided inside the reactor 1, and the aeration plate 104 is located below the stirring mechanism 105. Ozone is fed into the reactor 1 from the ozone inlet 102, and the maleic acid raw material is fed into the reactor 1 from the raw material inlet 101. After the ozone is aerated by the aeration plate 104, it reacts with the maleic acid raw material in the reactor 1 under the stirring action of the stirring mechanism 105 to obtain a glyoxylic acid product, which is output from the reactant outlet 103. A foam outlet 107 and a liquid return port 108 are also provided on the reactor wall of the reactor 1. A foam absorption mechanism 106 is also provided inside the reactor 1, and one end of the foam absorption mechanism 106 is connected to the foam outlet 107, and the other end is located inside the reactor 1. In some embodiments, the foam absorption mechanism 106 is located in the upper middle portion of the reactor 1 , and the liquid return port 108 is generally disposed at the top of the reactor 1 .
[0038] The tank wall of the foam treatment tank 2 is provided with a foam inlet 21, a liquid outlet 22, a tank body coolant inlet 23 and a tank body coolant outlet 24, wherein the foam inlet 21 is connected to the foam outlet 107 of the reactor 1, and the liquid outlet 22 is connected to the liquid return port 108 of the reactor 1. A defoaming mechanism 25 and a first heat exchange coil 26 are also provided in the foam treatment tank 2, one end of the first heat exchange coil 26 is connected to the tank body coolant inlet 23, and the other end is connected to the tank body coolant outlet 24.
[0039] The pump body 3 is connected to the reactor 1 and the foam treatment tank 2 respectively, providing the flow power of the foam and the liquid after the defoaming treatment. The coolant circulation processing mechanism 4 is connected to the tank body coolant inlet 23 and the tank body coolant outlet 24 respectively. The coolant circulation processing mechanism 4 provides low-temperature coolant, which enters the first heat exchange coil 26 through the tank body coolant inlet 23. The low-temperature coolant performs heat exchange in the foam treatment tank 2, cools down the material in the foam treatment tank 2, and becomes a high-temperature coolant. The high-temperature coolant flows back to the coolant circulation processing mechanism 4 from the tank body coolant outlet 24 for further cooling. The cooled coolant enters the first heat exchange coil 26 again to realize the circulation of the coolant.
[0040] By arranging a foam absorption mechanism 106 in the reactor 1, arranging a defoaming mechanism 25 in the foam treatment tank 2, and a first heat exchange coil 26 connected to the cooling liquid circulation treatment mechanism 4, when the succinic acid raw material and ozone are oxidized and generate foam in the reactor 1, under the power of the pump body 3, the foam absorption mechanism 106 absorbs the foam generated in the reactor 1 and transports it to the foam treatment tank 2. In the foam treatment tank 2, the defoaming mechanism 25 is used to defoam the foam to form liquid, and at the same time, the first heat exchange coil 26 is used to cool the foam and / or liquid to reduce the heat generated by the reaction and accelerate the defoaming of the foam. Under the power of the pump body 3, the cooled liquid is returned to the reactor 1 through the liquid return port 108 of the reactor 1, thereby realizing the recycling of the foam. Since the temperature of the liquid refluxed from the liquid return port 108 is low, the reaction heat in the reactor 1 can be reduced. Thus, the reaction efficiency in the reactor 1 is improved through the combined effects of defoaming treatment, foam recycling and cooling of the reactor 1, thereby improving the efficiency of preparing the glyoxylic acid product and the purity of the product.
[0041] In some embodiments, the defoaming mechanism 25 is an ultrasonic generator. The ultrasonic vibration generated by the ultrasonic generator propagates into the liquid, causing cavitation in the liquid. The cavitation generates impact force, which causes the gas dissolved in the liquid to break and separate, thereby achieving the purpose of eliminating foam.
[0042] In some embodiments, the foam absorption mechanism 106 includes a foam absorption head 1061 and a connecting tube 1062. The connecting tube 1062 is respectively connected to the foam absorption head 1061 and the foam outlet 107. The foam absorption head 1061 is a mesh structure, which can increase the area of foam absorption and can also perform certain defoaming while absorbing foam.
[0043] In some other embodiments, a spray mechanism 109 is further provided in the reactor 1, which is located above the foam absorption mechanism 106 and connected to the liquid return port 108. By providing the spray mechanism 109, the liquid refluxed from the liquid return port 108 can be sprayed into the reactor 1, thereby increasing the uniform cooling effect of the low-temperature refluxed liquid on the reactor 1, and at the same time, the contact area between the refluxed liquid and the foam in the reactor 1 that has not been absorbed by the foam absorption mechanism 106 can be increased, and the liquid spraying can play a certain role in eliminating foam.
[0044] In some other embodiments, the spray mechanism 109 includes an upper and lower two-stage spray sub-mechanism. The upper first-stage spray sub-mechanism is close to the liquid return port 108 and includes a spray head 1091, which is connected to the liquid return port 108. The second-stage spray sub-mechanism is located below the first-stage spray sub-mechanism, and the second-stage spray sub-mechanism includes a liquid collection box 1092, and a plurality of nozzles 1093 are formed at the bottom of the liquid collection box 1092. By setting the spray mechanism 109 as an upper and lower two-stage spray sub-mechanism, the first-stage spray sub-mechanism is used to facilitate communication with the liquid return port 108 and buffer the spray pressure, and the second-stage spray sub-mechanism can be used to increase the spray area, reduce the spray speed, and improve the cooling and defoaming effects of the reflux liquid and other substances in the reactor 1.
[0045] In some other embodiments, in order to further cool the inside of the reactor 1, the reactor 1 further includes a jacket 110, and the jacket 110 is provided with a jacket coolant inlet 111 and a jacket coolant outlet 112, and the coolant circulation treatment mechanism 4 is also connected to the jacket coolant inlet 111 and the jacket coolant outlet 112 respectively. The low-temperature coolant provided by the coolant circulation treatment mechanism 4 enters the jacket 110 through the jacket coolant inlet 111, cools the material in the reactor 1, and turns into a high-temperature coolant. The high-temperature coolant flows back to the coolant circulation treatment mechanism 4 from the jacket coolant outlet 112 for further cooling, and the cooled coolant enters the jacket 110 again to realize the circulation of the coolant. Thus, the jacket 110 and the coolant are used to realize the cooling of the reactor 1 outside the reactor 1.
[0046] In some other embodiments, a kettle coolant inlet 113 and a kettle coolant outlet 114 are further provided on the kettle wall of the reactor 1, and a second heat exchange coil 115 is further provided in the reactor 1, one end of the second heat exchange coil 115 is connected to the kettle coolant inlet 113, and the other end is connected to the kettle coolant outlet 114, and the coolant circulation treatment mechanism 4 is also connected to the kettle coolant inlet 113 and the kettle coolant outlet 114 respectively. The coolant circulation treatment mechanism 4 provides low-temperature coolant, which enters the second heat exchange coil 115 through the kettle coolant inlet 113, and the low-temperature coolant performs heat exchange in the reactor 1, cools down the substances in the reactor 1, and becomes high-temperature coolant. The high-temperature coolant flows back to the coolant circulation treatment mechanism 4 from the kettle coolant outlet 114 for further cooling, and the cooled coolant enters the second heat exchange coil 115 again to realize the circulation of the coolant. Therefore, the temperature of the reactor 1 is lowered inside the reactor 1 by using the second heat exchange coil 115 and the coolant.
[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the above embodiments, or to replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.
Claims
1. A device for preparing glyoxylic acid, characterized in that: The device comprises: A reactor, wherein a raw material inlet, an ozone inlet and a reactant outlet are arranged on the reactor wall, an aeration plate and a stirring mechanism are arranged inside the reactor, the aeration plate is located below the stirring mechanism, and the ozone introduced from the ozone inlet reacts with the raw material introduced from the raw material inlet after being aerated by the aeration plate; a foam outlet and a liquid return port are also arranged on the reactor wall of the reactor, and a foam absorption mechanism is also arranged inside the reactor, one end of the foam absorption mechanism is connected to the foam outlet, and the other end is located inside the reactor; A foam treatment tank, wherein a foam inlet, a liquid outlet, a tank cooling liquid inlet, and a tank cooling liquid outlet are arranged on the tank wall, wherein the foam inlet is connected to the foam outlet, and the liquid outlet is connected to the liquid return port; a defoaming mechanism and a first heat exchange coil are arranged in the foam treatment tank, wherein one end of the first heat exchange coil is connected to the tank cooling liquid inlet, and the other end is connected to the tank cooling liquid outlet; A pump body, which is connected to the reaction kettle and the foam treatment tank respectively; The cooling liquid circulation processing mechanism is respectively connected with the cooling liquid inlet of the tank body and the cooling liquid outlet of the tank body.
2. The device for preparing glyoxylic acid according to claim 1, characterized in that: A spray mechanism is also provided in the reactor, the spray mechanism is located above the foam absorption mechanism, and the spray mechanism is connected to the liquid return port.
3. The device for preparing glyoxylic acid according to claim 2, characterized in that: The spray mechanism comprises: A primary spray sub-mechanism, which is close to the liquid return port and includes a spray head, and the spray head is connected to the liquid return port; The secondary spray sub-mechanism is located below the primary spray sub-mechanism and comprises a liquid collecting box with a plurality of nozzles formed at the bottom thereof.
4. The device for preparing glyoxylic acid according to claim 1, characterized in that: The foam absorption mechanism comprises a foam absorption head and a connecting pipe, wherein the connecting pipe is connected to the foam absorption head and the foam outlet respectively, and the foam absorption head is a mesh structure.
5. The device for preparing glyoxylic acid according to claim 1, characterized in that: The defoaming mechanism is an ultrasonic generator.
6. The device for preparing glyoxylic acid according to any one of claims 1 to 5, characterized in that: The reactor further comprises a jacket, on which a jacket coolant inlet and a jacket coolant outlet are arranged, and the coolant circulation treatment mechanism is also connected to the jacket coolant inlet and the jacket coolant outlet respectively.
7. The device for preparing glyoxylic acid according to any one of claims 1 to 5, characterized in that: The reactor wall is also provided with a kettle cooling liquid inlet and a kettle cooling liquid outlet. A second heat exchange coil is also provided in the reactor, one end of the second heat exchange coil is connected to the kettle cooling liquid inlet, and the other end is connected to the kettle cooling liquid outlet. The cooling liquid circulation treatment mechanism is also respectively connected to the kettle cooling liquid inlet and the kettle cooling liquid outlet.