Automatic defoaming device in chemical reaction kettle

Abstract

The utility model provides an automatic defoaming device in a chemical reaction kettle, and belongs to the technical field of defoaming devices. The reaction kettle comprises a reaction kettle body, a stirring device, a defoaming paddle, an alarm device and a spraying device, when the liquid level in the reaction kettle body rises to the alarm liquid level set by the system, the alarm device gives an alarm and transmits an alarm signal to the automatic control system; the spraying device is used for spraying a defoaming agent into the reaction kettle body; and the automatic control system controls the spraying device to spray a defoaming agent into the reaction kettle body according to an alarm signal of the alarm device. According to the utility model, under the dual action of the defoaming paddle and the automatic spraying of the defoaming agent, the liquid level can be rapidly reduced to be below the alarm liquid level, so that the liquid level can be well inhibited, the space utilization rate of the chemical reaction device can be obviously improved, and the production efficiency and the operation safety of the chemical reaction device are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of defoaming devices, in particular to an automatic defoaming device in a chemical reaction kettle. Background Art

[0002] The green production method of 1,1'-binaphthyl-8,8'-dicarboxylic acid described in the inventor's patent CN202110704022.6 encountered new problems during the industrialization implementation process, as follows:

[0003] Nitrogen is generated during both the catalyst regeneration process and the catalyst consumption process. Bubbles are generated very quickly and in large quantities, and cannot overflow the liquid surface in time, resulting in low space utilization in the reactor and a long reaction time. Also, because the diazonium salt involved in the reaction is a very unstable compound, long-term storage will not only cause its decomposition and affect the purity of the final product, but also pose a great safety risk.

[0004] During the industrialization implementation of patent CN202110704022.6, the inventor solved the above new problems from two aspects: improving equipment and adding defoaming agents. And designed an automated defoaming system, which greatly improved production efficiency and production safety. Utility Model Content

[0005] In view of this, in order to achieve technical problems such as eliminating bubbles generated in the reactor to ensure the space utilization of the reactor, the utility model provides an automatic defoaming device in a chemical reactor. Under the dual effects of defoaming blades and automatic spraying defoaming agent, the liquid level will quickly drop to below the alarm liquid level, which has a good suppressive effect on the liquid level, can significantly improve the space utilization of such chemical reaction devices, and greatly improve the production efficiency and operation safety of such chemical reactions.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An automatic defoaming device in a chemical reactor, comprising:

[0008] Reactor body;

[0009] A stirring device, which is arranged in the kettle;

[0010] A defoaming blade, which is arranged on the stirring shaft of the stirring device and is close to the top of the reactor body;

[0011] An alarm device is arranged on the top of the reactor body and connected to the automatic control system. When the liquid level in the reactor body rises to the alarm liquid level set by the system, the alarm device sounds an alarm and transmits the alarm signal to the automatic control system;

[0012] A spraying device, which is used to spray a defoaming agent into the reactor body;

[0013] The automatic control system controls the spraying device to spray the defoaming agent into the reactor body according to the alarm signal of the alarm device.

[0014] Preferably, the alarm device is a radar liquid level detector.

[0015] Preferably, the defoaming blades are one of two or more spiral blades, fence blades and rake blades, which are arranged above the liquid level in the reactor body.

[0016] Preferably, the spraying device comprises:

[0017] A spray head connected to the reactor body;

[0018] A defoaming agent high-level tank, which is used to hold the defoaming agent;

[0019] The defoamer injection pump has two ends respectively connected to the defoamer high-level tank and the spray head, and is used to inject the defoamer into the reactor body through the spray head.

[0020] Preferably, the shower head is a micro shower head.

[0021] Preferably, the stirring device comprises:

[0022] A stirring motor, which is arranged above the reactor body;

[0023] A stirring shaft, one end of which is connected to the output end of the stirring motor;

[0024] A stirring blade is arranged at the other end of the stirring shaft.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] The automatic defoaming device in the chemical reaction kettle provided by the utility model can rapidly reduce the liquid level to below the alarm liquid level under the dual effects of the defoaming blades and the automatic spraying defoaming agent, and has a good suppressive effect on the liquid level, which can significantly improve the space utilization rate of such chemical reaction devices and greatly improve the production efficiency and operation safety of such chemical reactions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the utility model;

[0028] In the figure, 1. Radar liquid level detector; 2. Defoaming blade; 3. Spray head; 4. Defoaming agent injection pump; 5. Defoaming agent high-level tank; 6. Reactor body; 7. Stirring motor; 8. Alarm liquid level. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] like Figure 1 As shown, the utility model provides an automatic defoaming device in a chemical reaction kettle, comprising:

[0033] A reactor body 6, which may be a common reactor body 6 in chemical equipment. The outer wall of the reactor body 6 is preferably covered with a jacket, and a heat-conducting medium or a refrigerating medium may be used in the jacket to control the reaction temperature;

[0034] A stirring device, which is arranged in the kettle;

[0035] The defoaming blade 2 is arranged on the stirring shaft of the stirring device and close to the top of the reactor body 6. Its purpose is to defoam. The defoaming blade 2 can preferably be one of two or more spiral blades, fence blades and rake blades. It is arranged above the liquid level in the reactor body, fixedly connected to the stirring shaft of the stirring device, and on the same stirring shaft as the stirring blades in the stirring device.

[0036] An alarm device is arranged on the top of the reactor body 6 and is connected to the automatic control system. When the liquid level in the reactor body 6 rises to the alarm liquid level 8 set by the system, the alarm device sounds an alarm and transmits the alarm signal to the automatic control system;

[0037] A spraying device, which is used to spray a defoaming agent into the reactor body 6;

[0038] The automatic control system controls the spraying device to spray the defoaming agent into the reactor body 6 according to the alarm signal of the alarm device.

[0039] In the utility model, the alarm device is a radar liquid level detector 1.

[0040] In the present utility model, the spray device comprises:

[0041] A spray head 3, which is connected to the reactor body 6;

[0042] A defoaming agent high-level tank 5, which is used to hold the defoaming agent;

[0043] The defoaming agent injection pump 4 has two ends respectively connected to the defoaming agent high-level tank 5 and the spray head 3 , and is used to inject the defoaming agent into the reactor body 6 through the spray head 3 .

[0044] In the utility model, the spray head 3 is a micro spray head 3. When the liquid level exceeds the alarm level 8, the mass transfer effect of the liquid surface will be very poor, and there may be basically no flow. The micro spray head 3 can disperse the defoaming agent on the liquid surface, increase the contact surface, and thus improve the effect.

[0045] In the utility model, the defoaming blade 2 has the same function as the micro-spray head 3, except that the micro-spray head 3 applies the defoaming agent to the liquid surface in a plane, while the defoaming blade 2 has a three-dimensional effect, which can accelerate the mass transfer and effect of the defoaming agent, and achieve the effect of rapid defoaming and rapid suppression of the reaction liquid surface.

[0046] In the present invention, the stirring device comprises:

[0047] A stirring motor 7, which is arranged above the reactor body 6;

[0048] A stirring shaft, one end of which is connected to the output end of the stirring motor 7;

[0049] A stirring blade is arranged at the other end of the stirring shaft.

[0050] The defoaming principle of the utility model is as follows:

[0051] When the chemical reaction is carried out in the reactor body 6, if a large number of bubbles or foams are generated, the reaction liquid level will naturally rise. When the liquid level in the reactor body 6 rises to the alarm level 8 set by the system, the alarm device (radar level detector 1) will sound an alarm to inform the on-site inspectors, and automatically transmit the alarm signal to the automatic control system. The automatic control system will start the pulse signal transmission to the defoaming agent injection pump 4, and control the defoaming agent injection pump 4 to inject a certain amount of defoaming agent from the defoaming agent high-level tank 5 into the reactor body 6 through the micro-spray head 3 for defoaming. At the same time, the defoaming blades rotate under the drive of the stirring device to defoam.

[0052] Under the dual effects of the defoaming blades and the defoaming agent sprayed by the spraying device, the liquid level in the reactor body 6 will quickly drop to below the alarm liquid level 8, so that the reaction can be carried out continuously and safely. This can prevent the reaction materials from overflowing the reactor and causing safety accidents, so that the reaction can be carried out continuously and safely; and effectively utilize the use space of the reactor.

[0053] It should be noted that "the automatic control system transmits a pulsed start signal to the defoamer injection pump 4" means that the automatic control system controls the defoamer injection pump 4 to inject a fixed amount of defoamer into the reactor body 6 at a predetermined interval. The pulse interval time and the type and amount of defoamer injected each time need to be determined according to the specific chemical reaction conditions and can be preset in the automatic control system.

[0054] The working principle of the present utility model is described in detail below in conjunction with specific embodiments.

[0055] According to Example 1 disclosed in the invention patent with application number CN202110704022.6, 1-amino-8-naphthoic acid diazonium salt aqueous solution and reducing buffer solution are prepared. 50 kg of defoaming agent tributyl phosphate is added to the defoaming agent high-level tank 5 in advance.

[0056] The position of the alarm liquid level 8) is pre-set in the automatic control system to a height position of 15000L.

[0057] The amount of defoamer injected each time is preset to 200 ml, and the pulse interval is 2 minutes, that is, after 200 ml of defoamer is injected into the reactor body 6, if the liquid level is still higher than the alarm level 8 after 2 minutes, the defoamer injection pump 4 will inject 200 ml of defoamer tributyl phosphate into the reactor again.

[0058] Add the pre-configured reduction buffer into the 20000L reactor body 6, turn on the stirring motor 7, and add the pre-configured 1-amino-8-naphthoic acid diazonium salt aqueous solution from the high-level tank. With the addition of diazonium salt, a large amount of nitrogen is generated, and the reaction liquid level continues to rise. When the liquid level in the reactor body 6 rises to the alarm liquid level 8 set by the system, the radar liquid level detector 1 issues an alarm to prompt the on-site inspection personnel, and automatically transmits the signal to the automatic control system. The automatic control system will start the defoamer injection pump 4 in a pulsed manner, and inject 200ml of defoamer tributyl phosphate from the defoamer high-level tank 5 into the reactor body 6 through the micro-spray head 3. If the liquid level is still higher than the alarm liquid level 8 after 2 minutes, the defoamer injection pump 4 will inject 200ml of defoamer tributyl phosphate into the reactor again. Under the dual action of the defoaming blades and the defoamer, the liquid level will quickly drop below the alarm liquid level, so that the reaction can be carried out continuously and safely.

[0059] The above are only preferred specific implementations of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. An automatic defoaming device in a chemical reactor, characterized in that: include: Reactor body; A stirring device, which is arranged in the kettle; A defoaming blade, which is arranged on the stirring shaft of the stirring device and is close to the top of the reactor body; An alarm device is arranged on the top of the reactor body and connected to the automatic control system. When the liquid level in the reactor body rises to the alarm liquid level set by the system, the alarm device sounds an alarm and transmits the alarm signal to the automatic control system; A spraying device, which is used to spray a defoaming agent into the reactor body; The automatic control system controls the spraying device to spray the defoaming agent into the reactor body according to the alarm signal of the alarm device.

2. The automatic defoaming device in a chemical reactor according to claim 1, characterized in that: The alarm device is a radar liquid level detector.

3. The automatic defoaming device in a chemical reactor according to claim 1, characterized in that: The defoaming blades are one of two or more spiral blades, fence blades and rake blades, and are arranged above the liquid level in the reactor body.

4. The automatic defoaming device in a chemical reactor according to claim 1, characterized in that: The spraying device comprises: A spray head connected to the reactor body; A defoaming agent high-level tank, which is used to hold the defoaming agent; The defoamer injection pump has two ends respectively connected to the defoamer high-level tank and the spray head, and is used to inject the defoamer into the reactor body through the spray head.

5. The automatic defoaming device in a chemical reactor according to claim 4, characterized in that: The spray head is a micro spray head.

6. An automatic defoaming device in a chemical reactor according to any one of claims 1 to 5, characterized in that: The stirring device comprises: A stirring motor, which is arranged above the reactor body; A stirring shaft, one end of which is connected to the output end of the stirring motor; A stirring blade is arranged at the other end of the stirring shaft.

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