An oxidized wax low molecular acid removal device
By using nitrogen gas to remove low-molecular-weight acids from oxidized wax in the reactor, the complex problem of low-molecular-weight acid removal in oxidized wax production is solved, achieving efficient low-molecular-weight acid removal and improved water washing efficiency, thus reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG HUANGXING CHEM CO LTD
- Filing Date
- 2025-07-02
- Publication Date
- 2026-06-12
AI Technical Summary
The process of removing low-molecular-weight acids during the production of oxidized wax is complex. Multiple water washings after alkali neutralization affect production efficiency and generate a large amount of saline wastewater.
The reactor employs an in-vessel stirring and air-lifting assembly, utilizing nitrogen to remove volatile low-molecular-weight acids. Dynamic deacidification is achieved through the principle of gas-liquid balance, reducing the number of water washes and improving production efficiency.
The process for removing low-molecular-weight acids from oxidized wax has been simplified, reducing wastewater treatment volume, improving production efficiency and washing efficiency, and lowering production costs.
Smart Images
Figure CN224345839U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the chemical industry, and in particular to a device for removing low-molecular-weight acid from oxidized wax. Background Technology
[0002] Oxidized wax, as an important chemical product, is widely used in industries such as rubber, plastics, coatings, inks, and lubricants. With the continuous growth of the global economy and the increasing demand for high-performance and environmentally friendly materials in related industries, the oxidized wax market has shown a stable growth trend. However, during the production process, oxidized wax often produces low-molecular-weight acids due to cracking. These low-molecular-weight acids are volatile and irritating, and they are also highly corrosive, which can cause corrosion when packaged in iron drums.
[0003] Traditional methods for removing low-molecular-weight acids from oxidized wax mainly employ alkali neutralization, which involves reacting alkaline substances (such as sodium hydroxide or sodium carbonate) with the low-molecular-weight acids to generate salt and water. This is followed by multiple water washings to separate the salt and water, and finally, the washed oxidized wax is dried to obtain the finished product. However, the washing process generates a large amount of saline wastewater, and the multiple washings remove some of the oxidized wax, resulting in product loss. The existing problems include the complexity of the low-molecular-weight acid removal process from oxidized wax and the impact of multiple water washings after alkali neutralization on production efficiency. Therefore, a low-molecular-weight acid removal device for oxidized wax is proposed to solve these problems. Utility Model Content
[0004] The purpose of this invention is to provide a device for removing low-molecular-weight acids from oxidized wax, in order to solve the problems mentioned in the background art, such as the complexity of the process for removing low-molecular-weight acids from oxidized wax and the impact of multiple water washings after alkali neutralization on production efficiency. The technical solution of this invention provides a solution that is significantly different from the prior art.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A device for removing low-molecular-weight acids from oxidized wax includes a reaction vessel filled with a mixture of oxidized wax and water. The oxidized wax floats on the upper layer, and water is in the lower layer of the mixture. A stirring rod is installed inside the oxidized wax layer, and a stripping component for promoting the removal of low-molecular-weight acids from the oxidized wax is installed inside the water layer. A top plate is installed on top of the reaction vessel, and a drain pipe is installed below the reaction vessel. A drive component for rotating the stirring rod is installed on top of the top plate, and an exhaust pipe is installed inside the top plate, which is connected to an external vacuum pump.
[0007] Preferably, both the exhaust pipe and the drain pipe are equipped with valves, and the lower end of the drain pipe is connected to the filtration equipment.
[0008] Preferably, the driving component is a motor, and a drive shaft is provided at the lower end of the motor. The drive shaft passes through the top plate and extends into the interior of the reactor. The drive shaft is connected to the stirring rod.
[0009] Preferably, the air lifting assembly includes an air inlet pipe, an air pipe, and a plug. The air pipe is a hollow tubular structure with both ends open. The air pipe is made of stainless steel in a spiral state. The plug is welded to one end of the air pipe, and one end of the air inlet pipe is connected to one end of the air pipe.
[0010] Preferably, the surface of the trachea is provided with uniformly distributed pores, the openings of which face the oxide wax layer. Nitrogen gas enters the interior of the trachea through the inlet pipe and is discharged from the pores.
[0011] Compared with the prior art, the beneficial effects of this utility model are:
[0012] This invention involves filling a reaction vessel with a mixture of oxidized wax and water, with the oxidized wax floating on the surface. The mixture is at a temperature of 70°C. While the reaction vessel is under negative pressure and the stirring rod continuously agitates the oxidized wax, nitrogen gas is supplied to the reaction vessel via a gas lift assembly. The nitrogen enters the gas pipe through the inlet pipe and exits through the gas vent. The nitrogen bubbles then rise and contact the oxidized wax. According to Dalton's law of partial pressures, as the partial pressure of nitrogen increases, the partial pressure of the low-molecular-weight acid in the gas phase decreases. Due to the decrease in the pressure of the low-molecular-weight acid, according to Henry's law, the low-molecular-weight acid dissolves in the liquid phase. The solubility is directly proportional to the low molecular weight acid pressure (low molecular weight acid solubility = k × low molecular weight acid pressure, where k is Henry's constant). Therefore, as the solubility decreases, in order to reach a new gas-liquid equilibrium, the low molecular weight acid in the liquid phase will continue to volatilize into the gas phase to replenish the reduced low molecular weight acid pressure until the acid concentration in the liquid phase decreases to a new equilibrium state. Nitrogen, as a "carrier gas," continuously carries away the volatilized low molecular weight acid vapor, forming a dynamic removal effect. Compared with the traditional method of removing low molecular weight acid from oxidized wax by multiple water washings after alkali neutralization, this method simplifies the process and improves production efficiency. Attached Figure Description
[0013] Figure 1 A schematic diagram of a device for removing low-molecular-weight acids from oxidized wax;
[0014] Figure 2 A schematic diagram of the stirring rod in the device for removing low-molecular-weight acid from oxidized wax;
[0015] Figure 3 This is a schematic diagram of the air stripping component in a device for removing low-molecular-weight acid from oxidized wax.
[0016] In the diagram: 1. Reactor; 101. Exhaust pipe; 102. Drain pipe; 103. Top plate; 2. Motor; 201. Drive shaft; 202. Stirring rod; 3. Air lifting assembly; 301. Air inlet pipe; 302. Air pipe; 303. Plug; 304. Air hole. Detailed Implementation
[0017] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0020] Please see Figure 1-3In this utility model, a device for removing low molecular weight acids from oxidized wax includes a reaction vessel 1. The interior of the reaction vessel 1 is filled with a mixture of oxidized wax and water. The oxidized wax floats on the upper layer, and the lower layer of the mixture is water. A stirring rod 202 is installed inside the oxidized wax layer, and a stripping component 3 for promoting the removal of low molecular weight acids from the oxidized wax is installed inside the water layer. A top plate 103 is installed on the top of the reaction vessel 1, and a drain pipe 102 is installed below the reaction vessel 1. A motor 2 is installed on the top plate 103, and an exhaust pipe 101 is installed inside the top plate 103. The exhaust pipe 101 is connected to an external vacuum pump, which is in turn connected to a waste gas treatment device. Valves are installed on both the exhaust pipe 101 and the drain pipe 102. The lower end of the drain pipe 102 is connected to a filtration device.
[0021] Example 1: Please refer to Figure 1-3 In this embodiment of the present invention, a device for removing low molecular weight acid from oxidized wax is provided. The lower end of the motor 2 is provided with a drive shaft 201. The drive shaft 201 extends through the top plate 103 into the interior of the reaction vessel 1. The drive shaft 201 is connected to the stirring rod 202. When the stirring rod 202 stirs the oxidized wax layer, it can improve the uniformity of the oxidized wax dispersion in water and increase the contact area between the oxidized wax and water, thereby accelerating the efficiency of subsequent mass transfer.
[0022] The air lifting assembly 3 includes an air inlet pipe 301, an air pipe 302, and a plug 303. The air pipe 302 is a hollow tubular structure with both ends open. The air pipe 302 is made of stainless steel in a spiral state. The plug 303 is welded to one end of the air pipe 302. One end of the air inlet pipe 301 is connected to one end of the air pipe 302. The surface of the air pipe 302 is provided with evenly distributed air holes 304. The openings of the air holes 304 face the oxide wax layer. Nitrogen gas enters the interior of the air pipe 302 through the air inlet pipe 301 and is discharged from the air holes 304.
[0023] When the mixture heated to 60-80℃ is filled into the reactor 1, and the reactor 1 is under negative pressure, while the stirring rod 202 continuously stirs the oxidized wax in the mixture, the gas stripping component 3 supplies nitrogen gas into the reactor 1. After the nitrogen gas is discharged from the gas vent 304, the nitrogen gas bubbles rise and come into contact with the oxidized wax. According to Dalton's law of partial pressures, as the partial pressure of nitrogen increases, the partial pressure of low molecular weight acid in the gas phase decreases. Due to the decrease in the pressure of low molecular weight acid, according to Henry's law, the solubility of low molecular weight acid in the liquid phase is proportional to the pressure of low molecular weight acid (low molecular weight acid solubility = k × low molecular weight acid pressure, where k is Henry's constant). Therefore, the solubility decreases. In order to reach gas-liquid equilibrium again, the liquid phase... The low-molecular-weight acid in the liquid phase will continuously volatilize into the gas phase, replenishing the reduced low-molecular-weight acid pressure until the acid concentration in the liquid phase decreases to a new equilibrium state. Nitrogen, as the "carrier gas," continuously carries away the volatilized low-molecular-weight acid vapor, forming a dynamic removal effect. Subsequently, the low-molecular-weight acid gas is discharged from the exhaust pipe 101 along with the nitrogen gas and then guided by the vacuum pump to the waste gas treatment equipment until the gas is harmless and then discharged into the atmosphere. Finally, the oxidized wax is dried to remove moisture, and the oxidized wax product is obtained. The mixture is maintained at 60-80℃ inside the reactor 1, the nitrogen flow rate is maintained at 0.4L / min, the unit time is 30 minutes, and the ratio of oxidized wax to water in the mixture is 4:1.
[0024] Compared to the traditional method of first neutralizing the oxidized wax with alkali, then allowing the mixture to stand to separate the deacidified oxidized wax from the saline wastewater, and finally washing the deacidified oxidized wax multiple times with water to remove residual alkali (the ratio of oxidized wax to water is 1:1), the above process eliminates the need for alkali neutralization, reduces the number of times the oxidized wax needs to be washed with water, and allows the removal of low-molecular-weight acids during the water washing process. Furthermore, it allows for the addition of a higher mass fraction of oxidized wax to the same mass fraction of water, thereby improving washing efficiency, increasing production efficiency, reducing wastewater treatment volume, and lowering production costs.
[0025] To further highlight the difference between the above process and the traditional process, the technical solution of this utility model was implemented multiple times using this device to remove low molecular weight acids from oxidized wax, and the following experimental data were obtained:
[0026] Table 1
[0027] Data ID / Project Airlift flow rate (L / min) Temperature ℃ time min Water-soluble acid in advance Water-soluble acids after air extraction Non-air-lift water-washed water-soluble acids 1 0.4 70 30 1.0% 0.20% 0.30% 2 0.4 70 60 1.0% 0.18% 0.28% 3 0.2 70 30 1.0% 0.26% 0.31% 4 0.2 70 60 1.0% 0.22% 0.23%
[0028] In the table above, the water-soluble acids obtained after air stripping are from the process described above, while the water-soluble acids obtained without air stripping and water washing are from the traditional process.
[0029] The working principle of this invention is as follows: When the mixture of oxidized wax and water is filled into the reactor 1, the gas stripping component 3 delivers nitrogen gas into the reactor 1. The nitrogen gas bubbles rise and come into contact with the oxidized wax. According to Dalton's law of partial pressure, the nitrogen gas continuously carries away the low molecular weight acid gas, thereby achieving the effect of removing low molecular weight acid in a single water washing and gas stripping process. Afterward, the mixture enters the filtration device from the drain pipe 102, where the oxidized wax with the low molecular weight acid removed is separated from the mixture. Finally, the oxidized wax is dried to remove moisture, and the oxidized wax product is obtained.
[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A device for removing low-molecular-weight acid from oxidized wax, comprising a reaction vessel (1), characterized in that: The reactor (1) is filled with a mixture of oxidized wax and water. The oxidized wax floats on the upper layer, and the lower layer of the mixture is water. A stirring rod (202) is installed inside the oxidized wax layer, and a stripping component (3) is installed inside the water layer to promote the removal of low molecular weight acids from the oxidized wax. A top plate (103) is installed on the top of the reactor (1), and a drain pipe (102) is installed below the reactor (1). A drive component for driving the stirring rod (202) to rotate is installed on the top plate (103). An exhaust pipe (101) is installed inside the top plate (103), and the exhaust pipe (101) is connected to an external vacuum pump.
2. The device for removing low-molecular-weight acid from oxidized wax according to claim 1, characterized in that: Valves are provided on both the exhaust pipe (101) and the drain pipe (102), and the lower end of the drain pipe (102) is connected to the filtration equipment.
3. The device for removing low-molecular-weight acid from oxidized wax according to claim 1, characterized in that: The driving component is a motor (2), and a transmission shaft (201) is provided at the lower end of the motor (2). The transmission shaft (201) extends through the top plate (103) into the interior of the reactor (1). The transmission shaft (201) is connected to the stirring rod (202).
4. The device for removing low-molecular-weight acid from oxidized wax according to claim 1, characterized in that: The air lifting assembly (3) includes an air inlet pipe (301), an air pipe (302), and a plug (303). The air pipe (302) is a hollow tubular structure with both ends open. The air pipe (302) is made of stainless steel in a spiral state. The plug (303) is welded to one end of the air pipe (302). One end of the air inlet pipe (301) is connected to one end of the air pipe (302).
5. The device for removing low-molecular-weight acid from oxidized wax according to claim 4, characterized in that: The surface of the trachea (302) is provided with uniformly distributed pores (304), with the openings of the pores (304) facing the oxidized wax layer. Nitrogen gas enters the interior of the trachea (302) through the inlet pipe (301) and is discharged from the pores (304).