Mixing device for synthesizing adiponitrile through acrylonitrile electrolytic dimerization

Abstract

The mixing device comprises a bottom plate, a box body and a mixer are mounted on the rear side of the top end of the bottom plate, a three-phase separator, an oil cooler and an oil storage tank are arranged on the front side of the top end of the bottom plate, and an ultrasonic generator is arranged at the bottom of the mixer. According to the ultrasonic mixer, the ultrasonic generator and the ultrasonic vibrator plate are matched for use, the ultrasonic generator transmits energy waves of ultrasonic waves to the ultrasonic vibrator plate through the ultrasonic output pipe, and materials in the mixer are mixed through high-frequency vibration generated by the ultrasonic vibrator plate; and the output end of a servo motor drives a rotating rod to rotate, so that a plurality of groups of stirring rods rotate synchronously, the mixing effect is improved through two mixing modes, and a scraper rotates along with rotation during rotation, so that raw materials adhered to the inner wall of the mixer can be scraped off, workers can conveniently clean the mixer, and the requirements of the workers are further met.

Description

Technical Field

[0001] The utility model relates to the field of electrolytic chemistry, in particular to a mixing device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile. Background Art

[0002] Common synthesis processes for adiponitrile include adipic acid ammoniation dehydration method, caprolactam method, butadiene method and electrolytic acrylonitrile method. Adipic acid ammoniation dehydration method and caprolactam method have been gradually marginalized due to their low production capacity, inferior product quality and yield compared to butadiene method and electrolytic acrylonitrile method. The main synthesis methods currently used in industry are butadiene method and electrolytic acrylonitrile method. The butadiene method uses butadiene and hydrocyanic acid as raw materials and synthesizes adiponitrile in a two-step process under the catalyst of phosphine complex. The raw materials are cheap and easy to obtain, the route is short, the reaction conditions are mild and the energy consumption is low, the product yield and quality are relatively high, and it is a relatively advanced adiponitrile production process. However, since the process uses highly toxic hydrogen cyanide as raw material, it will cause great harm once it leaks, so there are very high requirements for equipment, operation and management during the production process.

[0003] However, the mixing means adopted by the existing mixing device are relatively simple and the effect is poor, so that the acrylonitrile dissolution effect is also poor, which is difficult to meet the needs of the staff and, to a certain extent, also reduces the practicability of the device. Utility Model Content

[0004] In order to solve the above technical problems, a mixing device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile is provided. The technical solution solves the problem that the existing mixing device proposed in the above background technology adopts a relatively single mixing means and has a poor effect, resulting in poor acrylonitrile dissolution effect and reducing the practicality of the device.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A mixing device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile comprises a bottom plate, a box body and a mixer are installed on the rear side of the top end of the bottom plate, a three-phase separator, an oil cooler and an oil storage tank are arranged on the front side of the top end of the bottom plate, an ultrasonic generator is arranged at the bottom of the mixer, an ultrasonic vibrator plate is installed on the inner wall of the mixer, a heating plate is installed on the side of the ultrasonic vibrator plate away from the inner wall of the mixer, a stirring mechanism is also arranged inside the mixer, an output end of the ultrasonic generator is connected to the ultrasonic vibrator plate through an ultrasonic output pipe, the stirring mechanism comprises a rotating rod, a stirring rod, a scraper and a servo motor, the servo motor is fixedly installed on the outer side of the mixer, the rotating rod is rotatably connected to the inside of the mixer, a plurality of groups of stirring rods are fixedly connected to the outer surface of the rotating rod, wherein the outer ends of two groups of stirring rods are fixedly connected to the scraper, the outer wall of the scraper is in contact with the heating plate, and the output end of the servo motor is fixedly connected to one end of the rotating rod.

[0007] Preferably, a support frame is provided on the rear side of the box body, an electrolyte replenishing tank is fixedly installed on the top of the support frame, a first valve is provided on the discharge end of the electrolyte replenishing tank, and an acrylonitrile replenishing tank is provided on the top of the mixer, a second valve is provided on the discharge end of the acrylonitrile replenishing tank.

[0008] Preferably, the right end of the box is connected to the mixer through a first connecting pipe, and the right end of the mixer is connected to the input end of the circulation pump through a second connecting pipe.

[0009] Preferably, the output end of the circulation pump is connected to the three-phase separator through a second connecting pipe, the top of the three-phase separator is connected to the oil cooler through a third connecting pipe, and the oil cooler is connected to the oil storage tank through a fourth connecting pipe.

[0010] Preferably, the bottom of the three-phase separator is connected to a first water outlet pipe, and the bottom of the oil cooler is connected to a second water outlet pipe.

[0011] Preferably, a temperature monitor is provided on the front side of the mixer.

[0012] Compared with the prior art, the utility model provides a mixing device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile, which has the following beneficial effects:

[0013] The utility model uses an ultrasonic generator and an ultrasonic vibrator plate in cooperation. The ultrasonic generator transmits ultrasonic energy waves to the ultrasonic vibrator plate through an ultrasonic output tube. The high-frequency vibration generated by the ultrasonic vibrator plate is used to mix the materials in the mixer. The output end of the servo motor drives the rotating rod to rotate, so that several groups of stirring rods rotate synchronously. The two mixing methods improve the mixing effect. When rotating, the scraper also rotates, so that the raw materials adhered to the inner wall of the mixer can be scraped off, which is convenient for staff to clean it, and further meets the needs of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the utility model from another viewing angle;

[0016] Figure 3 It is a front view of the utility model;

[0017] Figure 4 It is a structural schematic diagram of the stirring mechanism in the utility model;

[0018] Figure 5 It is a schematic diagram of the internal structure of the mixer in the utility model.

[0019] The numbers in the figure are:

[0020] 1. Bottom plate; 101. Box body; 102. Support frame; 103. Electrolyte replenishing tank; 104. First valve; 105. First connecting pipe; 106. Mixer; 107. Acrylonitrile replenishing tank; 108. Second valve; 109. Second connecting pipe; 110. Circulation pump; 111. Three-phase separator; 112. Third connecting pipe; 113. Oil cooler; 114. Fourth connecting pipe; 115. Oil storage tank; 116. First water outlet pipe; 117. Second water outlet pipe; 118. Ultrasonic generator; 119. Ultrasonic output pipe; 120. Heating plate; 121. Ultrasonic vibrator plate; 122. Temperature monitor; 2. Stirring mechanism; 201. Rotating rod; 202. Stirring rod; 203. Scraper; 204. Servo motor. DETAILED DESCRIPTION

[0021] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0022] Example 1

[0023] Please refer to Figure 1-5As shown, a mixing device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile comprises a bottom plate 1, a box 101 and a mixer 106 are installed on the rear side of the top end of the bottom plate 1, a three-phase separator 111, an oil cooler 113 and an oil storage tank 115 are arranged on the front side of the top end of the bottom plate 1, an ultrasonic generator 118 is arranged at the bottom of the mixer 106, and an ultrasonic vibrator plate 121 is installed on the inner wall of the mixer 106, a heating plate 120 is installed on the side of the ultrasonic vibrator plate 121 away from the inner wall of the mixer 106, a stirring mechanism 2 is also arranged inside the mixer 106, an output end of the ultrasonic generator 118 is connected to the ultrasonic vibrator plate 121 through an ultrasonic output pipe 119, and a temperature monitor 122 is arranged on the front side of the mixer 106.

[0024] Please refer to Figure 3 and Figure 4 As shown, the stirring mechanism 2 includes a rotating rod 201, a stirring rod 202, a scraper 203 and a servo motor 204. The servo motor 204 is fixedly installed on the outside of the mixer 106. The rotating rod 201 is rotatably connected to the inside of the mixer 106. Several groups of stirring rods 202 are fixedly connected to the outer surface of the rotating rod 201, wherein the outer ends of two groups of stirring rods 202 are fixedly connected to the scraper 203, the outer wall of the scraper 203 is in contact with the heating plate 120, and the output end of the servo motor 204 is fixedly connected to one end of the rotating rod 201.

[0025] In this solution, the ultrasonic generator 118 transmits the ultrasonic energy wave to the ultrasonic vibrator plate 121 through the ultrasonic output tube 119. The high-frequency vibration generated by the ultrasonic vibrator plate 121 achieves mixing of the materials in the mixer 106. The output end of the servo motor 204 drives the rotating rod 201 to rotate, so that several groups of stirring rods 202 rotate synchronously. Through the two mixing methods, the mixing effect is improved. When rotating, the scraper 203 also rotates, and the raw materials adhered to the inner wall of the mixer 106 can be scraped off, which is convenient for the staff to clean it, further meeting the needs of the staff. The heating plate 120 heats the materials during the mixing process, and the temperature monitor 122 can monitor the temperature inside the mixer 106 at all times.

[0026] Example 2

[0027] Please refer to Figure 1 and Figure 3 As shown, a support frame 102 is provided on the rear side of the box body 101, an electrolyte replenishing tank 103 is fixedly installed on the top of the support frame 102, a first valve 104 is provided on the discharge end of the electrolyte replenishing tank 103, and an acrylonitrile replenishing tank 107 is provided on the top of the mixer 106, and a second valve 108 is provided on the discharge end of the acrylonitrile replenishing tank 107.

[0028] Please refer to Figure 1As shown, the right end of the box 101 is connected to the mixer 106 through the first connecting pipe 105, and the right end of the mixer 106 is connected to the input end of the circulation pump 110 through the second connecting pipe 109.

[0029] Please refer to Figure 1 As shown, the output end of the circulation pump 110 is connected to the three-phase separator 111 through the second connecting pipe 109, the top of the three-phase separator 111 is connected to the oil cooler 113 through the third connecting pipe 112, and the oil cooler 113 is connected to the oil storage tank 115 through the fourth connecting pipe 114.

[0030] Please refer to Figure 3 As shown, the bottom of the three-phase separator 111 is connected to a first water outlet pipe 116 , and the bottom of the oil cooler 113 is connected to a second water outlet pipe 117 .

[0031] In this solution, the prepared electrolyte is sent to the electrolyte replenishing tank 103, the first valve 104 is opened to add the electrolyte into the box 101, and the circulation pump 110 is turned on to circulate the electrolyte. Through the cooperation of the acrylonitrile replenishing pump 2 and the second valve 108, acrylonitrile is gradually added to the circulating electrolyte until the mass percentage of acrylonitrile in the circulating electrolyte reaches 5%. In this process, through the cooperation of the two mixing modes of the mixer 106, the temperature monitor 122 and the temperature monitor 122, the components in the circulating electrolyte are fully mixed and preheated to 42°C.

[0032] After electrolysis, the electrolyte mixture containing adiponitrile and oxygen enters the three-phase separator 111, and the three-phase separator 11 makes the electrolyte water phase flow out from the first outlet pipe 116, and the oil and gas flow out from the top and enter the oil cooler 113. In the oil cooler 113, the oil and gas are further separated, the oil flows out from the upper part of the cooler, the gas flows out from the top, and the electrolyte water phase flows out from the second outlet pipe 117. The tail gas outlet of the oil cooler is sampled and analyzed, and the temperature of the oil cooler 113 is adjusted to make the acrylonitrile tail gas content less than 100ppm. The separated oil enters the oil storage tank 115, and the electrolyte water phase flowing out of the first outlet pipe 116 and the second outlet pipe 117 re-enters the mixer 106, and so on. After 48h of continuous reaction, the crude adiponitrile concentration in the oil storage tank 115 is 60%. The collected oil phase is distilled to obtain the product adiponitrile.

[0033] The working principle and use process of this device are as follows: the ultrasonic generator 118 transmits the ultrasonic energy wave to the ultrasonic vibrator plate 121 through the ultrasonic output tube 119. The high-frequency vibration generated by the ultrasonic vibrator plate 121 is used to mix the materials in the mixer 106. The output end of the servo motor 204 drives the rotating rod 201 to rotate, so that several groups of stirring rods 202 rotate synchronously. The two mixing methods improve the mixing effect. When rotating, the scraper 203 also rotates, and the raw materials adhered to the inner wall of the mixer 106 can be scraped off, which is convenient for the staff to clean it, further meeting the needs of the staff.

[0034] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A mixing device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile, characterized in that: The invention comprises a bottom plate (1), a box (101) and a mixer (106) are installed on the rear side of the top end of the bottom plate (1), a three-phase separator (111), an oil cooler (113) and an oil storage tank (115) are arranged on the front side of the top end of the bottom plate (1), an ultrasonic generator (118) is arranged at the bottom of the mixer (106), an ultrasonic oscillator plate (121) is installed on the inner wall of the mixer (106), a heating plate (120) is installed on the side of the ultrasonic oscillator plate (121) away from the inner wall of the mixer (106), a stirring mechanism (2) is also arranged inside the mixer (106), and the output end of the ultrasonic generator (118) is connected to the ultrasonic oscillator plate (121) through an ultrasonic output pipe (119); The stirring mechanism (2) comprises a rotating rod (201), a stirring rod (202), a scraper (203) and a servo motor (204); the servo motor (204) is fixedly mounted on the outside of the mixer (106); the rotating rod (201) is rotatably connected to the inside of the mixer (106); a plurality of groups of stirring rods (202) are fixedly connected to the outer surface of the rotating rod (201); the outer ends of two groups of stirring rods (202) are fixedly connected to the scraper (203); the outer wall of the scraper (203) is in contact with the heating plate (120); and the output end of the servo motor (204) is fixedly connected to one end of the rotating rod (201).

2. A mixing device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile according to claim 1, characterized in that: A support frame (102) is provided at the rear side of the box body (101), an electrolyte replenishing tank (103) is fixedly mounted on the top of the support frame (102), a first valve (104) is provided on the discharge end of the electrolyte replenishing tank (103), and an acrylonitrile replenishing tank (107) is provided on the top of the mixer (106), a second valve (108) is provided on the discharge end of the acrylonitrile replenishing tank (107).

3. A mixing device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile according to claim 1, characterized in that: The right end of the box (101) is connected to the mixer (106) through a first connecting pipe (105), and the right end of the mixer (106) is connected to the input end of the circulation pump (110) through a second connecting pipe (109).

4. A mixing device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile according to claim 3, characterized in that: The output end of the circulation pump (110) is connected to the three-phase separator (111) via a second connecting pipe (109), the top of the three-phase separator (111) is connected to the oil cooler (113) via a third connecting pipe (112), and the oil cooler (113) is connected to the oil storage tank (115) via a fourth connecting pipe (114).

5. A mixing device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile according to claim 1, characterized in that: The bottom of the three-phase separator (111) is connected to a first water outlet pipe (116), and the bottom of the oil cooler (113) is connected to a second water outlet pipe (117).

6. A mixing device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile according to claim 1, characterized in that: A temperature monitor (122) is provided on the front side of the mixer (106).

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