Homogenizing and preheating device used before acidification of disodium salt feed liquid in sebacic acid production

Abstract

The utility model discloses a homogenizing and preheating device used before acidification of disodium salt feed liquid in sebacic acid production. The device is characterized in that a steam heating coil is arranged at the inner bottom of a tank body and below a stirrer, the steam heating coil is arranged at the inner bottom of the tank body and below the stirrer, the steam heating coil is provided with a steam input pipeline and a condensate water output pipeline, and the steam input pipeline is connected with a steam generator; a steam input valve is arranged on the steam input pipeline; a condensate water discharge valve is arranged on the condensate water discharge pipeline, and the condensate water discharge valve is matched with the steam input valve for use; and a temperature measuring point of the temperature measuring sensor is arranged in the tank body, so that the temperature of the feed liquid in the tank body is monitored in real time. According to the device, sebacic acid disodium salt can be fully dissolved and uniformly stirred, meanwhile, the temperature of the sebacic acid disodium salt solution is regulated and controlled, so that the temperature of the sebacic acid disodium salt solution is kept in a proper range, the uniform mixing process and the heating process are carried out in a coincident manner, the time is saved, and the preparation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production equipment, in particular to a homogenizing and preheating device before acidification of disodium salt liquid in the production of sebacic acid. Background Art

[0002] Sebacic acid is a white flaky crystal. It is slightly soluble in water, soluble in ethanol and ether, flammable and basically non-toxic. Ricinoleic acid, which can be obtained by hydrolyzing natural castor oil, reacts with NaOH solution, and is heated to 250-300°C in a cracking kettle under the condition of commingling with phenol flux to produce disodium sebacic acid, octanol and hydrogen. The cracking product is diluted with water, heated and neutralized with acid to convert the disodium salt into monosodium salt; the neutralized solution is then boiled and decolorized with activated carbon, and then an appropriate amount of sulfuric acid is added to convert the monosodium sebacic acid into sebacic acid, which is crystallized and then centrifuged and dried to obtain the finished product.

[0003] The acid neutralization needs to keep the temperature at about 85℃. Too high temperature will not only aggravate the corrosion of equipment and increase energy consumption, but also affect the stability of the product. Too low temperature will slow down the reaction rate and reduce the solubility of disodium sebacic acid. Therefore, the temperature of disodium sebacic acid solution is very important for the reaction effect of acid neutralization reaction.

[0004] In the existing technical solution, different batches of disodium sebacic acid of different concentrations are fully mixed in a homogenizing tank, preheated to about 85°C, and then acid is added for neutralization. Neutralization and heating are carried out separately, resulting in a waste of time. Ordinary homogenizing tanks only have dissolving and stirring functions, and do not have temperature control functions. Summary of the invention

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and propose a homogenizing and preheating device before acidification of disodium salt liquid in sebacic acid production, which can make different batches of disodium sebacic acid fully dissolved and stirred evenly, and at the same time regulate the temperature of the disodium sebacic acid solution so that the temperature of the disodium sebacic acid solution is maintained within a suitable range, and the mixing process and the heating process are performed in overlap, which saves time and improves preparation efficiency.

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

[0007] A homogenizing and preheating device for disodium salt liquid before acidification in the production of sebacic acid comprises a tank body, a motor reducer assembly, a liquid level float, a steam heating coil, a stirrer, and a temperature sensor.

[0008] The agitator is placed inside the tank body, and the motor reducer assembly provides stirring power to the agitator to control the stirring speed; the liquid level float is placed on the liquid surface in the tank body to measure the liquid level; a feed liquid inlet is set on one side of the upper part of the tank body, and a feed liquid outlet is set on one side of the lower part. An outlet metering pump is set at the feed liquid outlet to accurately and evenly pump the feed liquid into the acidification tank for subsequent reaction.

[0009] The steam heating coil is placed at the bottom of the tank body and below the agitator. The steam heating coil is provided with a steam input pipe and a condensed water output pipe. The steam input pipe is connected to a steam generator. The steam generator provides high-temperature and high-pressure steam to the steam heating coil to reach the required temperature. A steam input valve is provided on the steam input pipe, and the steam input valve is used to adjust the steam input amount. A condensed water discharge valve is provided on the condensed water discharge pipe, and the condensed water discharge valve and the steam input valve are used in conjunction with each other.

[0010] The temperature measuring point of the temperature sensor is placed inside the tank body to monitor the temperature of the feed liquid inside the tank body in real time, and the steam input amount is adjusted in real time according to the feed liquid temperature. If the feed liquid temperature is lower than the target temperature range, the steam input amount is increased, and if the feed liquid temperature is higher than the target temperature range, the steam input amount is reduced.

[0011] Preferably, the distance between the end of the stirring blade of the stirrer and the inner wall of the tank body is 10 cm.

[0012] Preferably, the distance between the bottom of the stirring blade of the stirrer and the bottom surface of the tank body is 45 cm.

[0013] Preferably, the liquid level inside the tank body is 25 to 35 cm away from the top surface of the tank body.

[0014] Preferably, the liquid inlet is 20-25 cm away from the top surface of the tank body.

[0015] Preferably, a PLC controller is also included, and there are multiple temperature sensors, each of which is connected to the PLC controller, and the PLC controller is connected to the steam input valve and the condensate discharge valve. The temperature sensor transmits the monitored temperature value to the PLC controller, and the PLC controller sends instructions to the steam input valve and the condensate discharge valve according to the temperature value. If the average value of each temperature value is within the target temperature range, no processing is performed. If the average value of each temperature value is lower than the target temperature range, the opening of the steam input valve is increased, the steam input amount is increased, and the condensate is discharged in time.

[0016] The PLC controller mentioned above sends instructions to the steam input valve and the condensate discharge valve according to the temperature value, which belongs to the existing content in the prior art and can be directly used by those skilled in the art.

[0017] The target temperature range mentioned above is generally 82~85℃.

[0018] Specifically, castor oil is heated and hydrolyzed under the action of alkali to generate sodium ricinoleate soap, and then sulfuric acid is added for acid hydrolysis to generate ricinoleic acid; in the presence of a diluent cresol, alkali is added and heated to 260-280°C for cracking to generate disodium sebacic acid, 2-octanol and hydrogen; disodium sebacic acid and water are poured into a homogenizing tank through a feed liquid inlet in a certain proportion to dissolve and dilute the disodium sebacic acid, and a stirrer is started at the same time to allow the disodium sebacic acid to fully dissolve and reach a dissolution equilibrium state.

[0019] During the dissolution process, high-temperature and high-pressure steam is input into the steam heating coil to heat the solution. The steam input amount is adjusted according to the solution temperature displayed by the temperature sensor to keep the solution within the target temperature range. After a certain period of stirring and dissolving, the concentration of the slurry is measured, and the slurry is accurately and uniformly pumped into the acidification tank through the outlet metering pump to proceed to the next step of acidification and neutralization reaction.

[0020] The steam inlet valve and condensate drain valve can be controlled manually by a technician or automatically.

[0021] The beneficial effects of the utility model are:

[0022] The utility model is provided with a steam heating coil, a temperature sensor and a steam input valve to heat the material liquid in the tank, and the steam input valve is regulated according to the temperature value of the temperature sensor to control the material liquid temperature within a reasonable range, thereby preventing excessively high temperature from aggravating the corrosion of the equipment and preventing excessively low temperature from slowing down the reaction rate.

[0023] The utility model is provided with a PLC controller, which is connected with a temperature sensor and a steam input valve. The temperature sensor transmits the monitored temperature value to the PLC controller, and the PLC controller processes the temperature value of each temperature sensor. If the average value of each temperature value is within a target temperature range, no processing is performed. If the average value of each temperature value is lower than the target temperature range, the opening of the steam input valve is increased, the steam input amount is increased, and the automatic control of the feed liquid temperature is realized.

[0024] By adopting the above scheme, the utility model can make the disodium sebacic acid salt fully dissolved and stirred evenly, and at the same time adjust the temperature of the disodium sebacic acid salt solution so that the temperature of the output liquid, i.e., the disodium sebacic acid salt solution, is maintained within a suitable range. The dilution process and the heating process are performed in parallel, which saves time, improves preparation efficiency, and reduces corrosion to equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 It is a schematic structural diagram of the first embodiment.

[0027] Figure 2 It is a schematic structural diagram of the second embodiment.

[0028] In the figure, 1-motor reducer assembly, 2-liquid inlet, 3-liquid level float, 4-liquid outlet, 5-steam heating coil, 6-agitator, 7-temperature sensor, 8-steam input valve, 9-condensate discharge valve, 10-PLC controller. Implementation

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0031] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the 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.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying 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 one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] First embodiment:

[0034] like Figure 1 As shown, a homogenizing and preheating device for disodium salt liquid before acidification in the production of sebacic acid includes a tank body, a motor reducer assembly 1, a liquid level float 3, a steam heating coil 5, a stirrer 6, and a temperature sensor 7.

[0035] The agitator 6 is placed inside the tank body, and the motor reducer assembly 1 provides stirring power to the agitator 6 to control the stirring speed; the liquid level float 3 is placed on the liquid surface in the tank body to measure the liquid level; a feed liquid inlet 2 is provided on one side of the upper part of the tank body, and a feed liquid outlet 4 is provided on one side of the lower part, and an outlet metering pump is provided at the feed liquid outlet 4 to accurately and uniformly pump the feed liquid into the acidification tank for subsequent reaction.

[0036] The steam heating coil 5 is placed at the bottom of the tank body and below the agitator 6. The steam heating coil 5 is provided with a steam input pipe and a condensate output pipe. The steam input pipe is connected to a steam generator. The steam generator provides high-temperature and high-pressure steam to the steam heating coil to reach the required temperature. A steam input valve 8 is provided on the steam input pipe, and the steam input valve 8 is used to adjust the steam input amount. A condensate discharge valve 9 is provided on the condensate discharge pipe, and the condensate discharge valve 9 and the steam input valve 8 are used in conjunction with each other.

[0037] The temperature measuring point of the temperature sensor 7 is placed inside the tank body to monitor the temperature of the feed liquid inside the tank body in real time, and the steam input amount is adjusted in real time according to the feed liquid temperature. If the feed liquid temperature is lower than the target temperature range, the steam input amount is increased; if the feed liquid temperature is higher than the target temperature range, the steam input amount is reduced.

[0038] Second embodiment:

[0039] like Figure 2 As shown, a homogenizing and preheating device for disodium salt liquid before acidification in the production of sebacic acid includes a tank body, a motor reducer assembly 1, a liquid level float 3, a steam heating coil 5, a stirrer 6, and a temperature sensor 7.

[0040] The agitator 6 is placed inside the tank body, and the motor reducer assembly 1 provides stirring power to the agitator 6 to control the stirring speed; the liquid level float 3 is placed on the liquid surface in the tank body to measure the liquid level; a feed liquid inlet 2 is provided on one side of the upper part of the tank body, and a feed liquid outlet 4 is provided on one side of the lower part, and an outlet metering pump is provided at the feed liquid outlet 4 to accurately and uniformly pump the feed liquid into the acidification tank for subsequent reaction.

[0041] The steam heating coil 5 is placed at the bottom of the tank body and below the agitator 6. The steam heating coil 5 is provided with a steam input pipe and a condensed water output pipe. The steam input pipe is connected to the steam generator. The steam generator provides high-temperature and high-pressure steam to the steam heating coil to reach the required temperature. The steam temperature can be increased by adjusting the steam pressure. A steam input valve 8 is provided on the steam input pipe, and the steam input valve 8 is used to adjust the steam input amount. A condensed water discharge valve 9 is provided on the condensed water discharge pipe, and the condensed water discharge valve 9 and the steam input valve 8 are used in conjunction with each other.

[0042] The temperature measuring point of the temperature measuring sensor 7 is placed inside the tank body to monitor the temperature of the liquid inside the tank body in real time. There are multiple temperature measuring sensors 7.

[0043] It also includes a PLC controller 10. Each temperature sensor 7 is connected to the PLC controller 10. The PLC controller 10 is connected to the steam input valve 8 and the condensate discharge valve 9. The temperature sensor 7 transmits the monitored temperature value to the PLC controller 10. The PLC controller 10 sends instructions to the steam input valve 8 and the condensate discharge valve 9 according to the temperature value. If the average value of each temperature value is within the target temperature range, no processing is performed. If the average value of each temperature value is lower than the target temperature range, the opening of the steam input valve 8 is increased, the steam input amount is increased, and the condensate is discharged in time.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A homogenization and preheating device for disodium salt liquid before acidification in the production of sebacic acid, comprising a tank body, a motor reducer assembly, a liquid level float, and a stirrer, wherein the stirrer is placed inside the tank body, the motor reducer assembly provides stirring power to the stirrer, the liquid level float is placed on the liquid surface in the tank body, a liquid inlet is arranged on one side of the upper part of the tank body, a liquid outlet is arranged on one side of the lower part, and an outlet metering pump is arranged at the liquid outlet, characterized in that: It also includes a steam heating coil and a temperature sensor. The steam heating coil is placed at the bottom of the tank body and below the agitator. The steam heating coil is provided with a steam input pipe and a condensed water output pipe, and the steam input pipe is connected to the steam generator; a steam input valve is provided on the steam input pipe; a condensed water discharge valve is provided on the condensed water output pipe, and the condensed water discharge valve and the steam input valve are used in conjunction with each other; the temperature measuring point of the temperature sensor is placed inside the tank body to monitor the temperature of the material liquid inside the tank body in real time.

2. The homogenization and preheating device before acidification of disodium salt liquid in the production of sebacic acid according to claim 1, characterized in that: The distance between the end of the stirring blade of the stirrer and the inner wall of the tank body is 10 cm.

3. The homogenization and preheating device before acidification of disodium salt liquid in the production of sebacic acid according to claim 1, characterized in that: The distance between the bottom of the stirring blade of the stirrer and the inner bottom surface of the tank body is 45 cm.

4. The homogenization and preheating device before acidification of disodium salt liquid in the production of sebacic acid according to claim 1, characterized in that: The liquid inlet is 20-25 cm away from the top surface of the tank body.

5. The homogenization and preheating device before acidification of disodium salt liquid in the production of sebacic acid according to claim 1, characterized in that: It also includes a PLC controller. There are multiple temperature sensors, each of which is connected to the PLC controller. The PLC controller is connected to the steam input valve and the condensate discharge valve. The temperature sensor transmits the monitored temperature value to the PLC controller, and the PLC controller sends instructions to the steam input valve and the condensate discharge valve according to the temperature value.

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