Citric acid crystallization device
By designing a citric acid crystallization device including an MVR evaporator, a buffer tank, agitator, an output device and a multi-stage centrifuge, the problems of low citric acid crystallization and energy waste in the prior art are solved, and efficient citric acid crystallization and energy utilization are achieved.
Patent Information
- Application Number
- CN202421528758.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-07-01
AI Technical Summary
The existing citric acid crystallization method has low crystallization yield, resulting in a large amount of citric acid entering the mother liquor, and the heat in the mother liquor cannot be reused, resulting in waste of energy.
A citric acid crystallization device including an MVR evaporator, a buffer tank, agitator, an output device and a multi-stage centrifuge is designed. It is concentrated by an MVR evaporator, a buffer tank is cultivated, and a multi-stage centrifuge is centrifuged and cooled to crystallize, and the heat of the mother liquor is fully utilized through the output device.
It improves the crystallization yield of citric acid, makes full use of the heat in the mother liquor, improves production efficiency and reduces production costs.
Smart Images
Figure CN222752587U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of crystallization devices, in particular to a citric acid crystallization device. Background Art
[0002] Citric acid has a mild and refreshing sour taste and is widely used in the manufacture of various beverages, soda, wine, candy, snacks, biscuits, canned juice, dairy products and other foods. It can also be used in the chemical and textile industries, environmental protection, cosmetics and pharmaceutical industries. At present, the main operation method for producing anhydrous citric acid is direct evaporation crystallization. The main method for producing monohydrate citric acid is to evaporate the citric acid solution to a certain concentration and then cool it down for crystallization. Specifically, it includes: after the purified citric acid solution is heated and concentrated, the citric acid concentrate is placed in a buffer tank, the buffer tank is equipped with stirring and heat preservation, the crystallization process mainly relies on heating and concentrating the citric acid concentrate to reach supersaturation until crystals precipitate, and then the crystals are grown in the buffer tank, and then the solid-liquid separation is performed to obtain anhydrous citric acid crystals and crystallization mother liquor; or after the purified citric acid solution is heated and concentrated, it is placed in a crystallization tank, the buffer tank is equipped with stirring and cooling measures, and then monohydrate citric acid is obtained by cooling and crystallization, wherein the critical crystallization temperature of monohydrate citric acid and anhydrous citric acid is 36.6℃. This method has a low crystallization yield, a large amount of citric acid enters the mother liquor, and the heat in the mother liquor after centrifugation cannot be reused, resulting in energy waste. Utility Model Content
[0003] The purpose of the utility model is to provide a citric acid crystallization device in order to solve the above problems, which not only improves the citric acid crystallization yield, but also can make full use of the heat in the mother liquor, improve production efficiency and reduce production costs.
[0004] In order to solve the above problems, the utility model provides a technical solution: a citric acid crystallization device, including an MVR evaporator, a buffer tank, a stirring mechanism 1, an output device 1, a primary centrifuge, a cooling tank 1, a cooling pipe 1, a stirring mechanism 2, an output device 2, a secondary centrifuge, a cooling tank 2, a cooling pipe 2, a stirring mechanism 3, an output device 3, a tertiary centrifuge and a mother liquor output pipe; the MVR evaporator outlet is connected to the buffer tank inlet; a stirring mechanism 1 is provided inside the buffer tank, and an output device 1 is provided at the output port on the lower side of the stirring mechanism, and the output device 1 outlet is connected to the primary centrifuge inlet; The outlet of the first-stage centrifuge is connected to the inlet of the cooling tank one; a stirring mechanism two is provided in the central interior of the cooling tank one, a cooling pipe one is provided inside the cooling tank one around, an output device two is provided at a lower side outlet of the cooling tank, and the outlet of the output device two is connected to the inlet of the second-stage centrifuge; the outlet of the second-stage centrifuge is connected to the inlet of the cooling tank two; a stirring mechanism three is provided in the central interior of the cooling tank two, a cooling pipe two is provided inside the cooling tank two around, an output device three is provided at the lower side outlet of the cooling tank two, and the outlet of the output device three is connected to the inlet of the third-stage centrifuge; a mother liquor output pipe is provided at the outlet of the third-stage centrifuge.
[0005] Preferably, the stirring mechanism three and the stirring mechanism two are consistent with the structure of the stirring mechanism one, and the specific structure of the stirring mechanism one includes a stirring motor, a stirring shaft and stirring blades; the stirring motor is fixedly connected to the center of the top of the buffer tank; the stirring shaft is movably connected to the center of the inside of the buffer tank, the upper center of the stirring shaft is fixedly connected to the lower output shaft of the stirring motor, and a plurality of stirring blades are fixedly connected to the outside of the lower side of the stirring shaft.
[0006] Preferably, the stirring motor is a servo motor or a variable frequency motor.
[0007] Preferably, the output device three and the output device two are consistent with the structure of the output device one, and the specific structure of the output device one includes a fixed seat, an output motor, a driving gear, a driven gear, a spline shaft, a cylinder, a connecting hole block, a T-shaped head, an output connecting pipe, a conveying channel, a conveying screw rod and a cover; the upper outer side of the fixed seat is fixedly connected to the inside of the lower opening of the buffer tank, the upper inner side of the fixed seat is provided with a conveying channel, the lower right side of the fixed seat is fixedly connected to the output motor, and the output shaft of the output motor is fixedly connected to the driving gear, and the bottom center of the fixed seat is fixedly connected to the gas Cylinder; the conveying screw rod is movably connected inside the conveying channel, a cover is fixedly connected to the top of the conveying screw rod, and a spline shaft is fixedly connected to the lower end of the conveying screw rod; the driven gear is movably connected inside the lower side of the fixed seat, the spline hole arranged in the center of the driven gear is connected to the spline shaft, and the driven gear is connected to the driving gear; the lower end of the spline shaft is fixedly connected to a connecting hole block, and a T-shaped head is movably connected inside the lower side of the connecting hole block, and the lower end of the T-shaped head is fixedly connected to the end of the piston rod on the upper side of the cylinder; an output connecting pipe is provided at the lower right outlet of the conveying channel.
[0008] Preferably, the output motor is a servo motor or a variable frequency motor.
[0009] Preferably, the cooling tube 1 and the cooling tube 2 are both arranged in a spiral shape.
[0010] The beneficial effects of the utility model are as follows: (1) The utility model has a reasonable and simple structure, low production cost and convenient installation. Here, stirring mechanism 1, stirring mechanism 2 and stirring mechanism 3 are turned on, and the stirring speed is controlled at 10-60 rpm, thereby improving the efficiency of crystallization and thus improving the efficiency of production.
[0011] (2) The output device 1, output device 2 and output device 3 provided in the utility model can move the lid upward and open by extending the cylinder, and then drive the conveying screw rod to rotate by the output motor, thereby improving the efficiency of liquid output. In addition, it also avoids the temperature drop caused by slow conveying, and can make full use of the heat in the mother liquor, thereby improving production efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of the utility model.
[0013] Figure 2 It is a structural schematic diagram of the stirring mechanism.
[0014] Figure 3 A schematic diagram of the structure of the output device.
[0015] 1-MVR evaporator; 2-buffer tank; 3-stirring mechanism one; 4-output device one; 5-first-stage centrifuge; 6-cooling tank one; 7-cooling pipe one; 8-stirring mechanism two; 9-output device two; 10-second-stage centrifuge; 11-cooling tank two; 12-cooling pipe two; 13-stirring mechanism three; 14-output device three; 15-third-stage centrifuge; 16-mother liquor output pipe; 31-stirring motor; 32-stirring shaft; 33-stirring blade; 41-fixed seat; 42-output motor; 43-driving gear; 44-driven gear; 45-spline shaft; 46-cylinder; 47-connecting hole block; 48-T-head; 49-output connecting pipe; 410-conveying channel; 411-conveying screw rod; 412-cover. DETAILED DESCRIPTION
[0016] like Figure 1 As shown, this specific embodiment adopts the following technical scheme: a citric acid crystallization device, including an MVR evaporator 1, and also including a buffer tank 2, a stirring mechanism 3, an output device 4, a primary centrifuge 5, a cooling tank 6, a cooling pipe 7, a stirring mechanism 8, an output device 9, a secondary centrifuge 10, a cooling tank 11, a cooling pipe 12, a stirring mechanism 3 13, an output device 3 14, a tertiary centrifuge 15 and a mother liquor output pipe 16; the outlet of the MVR evaporator 1 is connected to the inlet of the buffer tank 2; a stirring mechanism 3 is provided inside the buffer tank 2, and an output device 4 is provided at the output port on the lower side of the stirring mechanism 3, and the outlet of the output device 4 is connected to the inlet of the primary centrifuge 5; the primary centrifuge The outlet of the centrifuge 5 is connected to the inlet of a cooling tank 6; a stirring mechanism 28 is provided in the central interior of the cooling tank 6, a cooling pipe 7 is provided inside the cooling tank 6 around, an output device 29 is provided at the lower outlet of the cooling tank 6, and the outlet of the output device 29 is connected to the inlet of a secondary centrifuge 10; the outlet of the secondary centrifuge 10 is connected to the inlet of a cooling tank 2 11; a stirring mechanism 3 13 is provided in the central interior of the cooling tank 2 11, a cooling pipe 2 12 is provided inside the cooling tank 2 11 around, an output device 3 14 is provided at the lower outlet of the cooling tank 2 11, and the outlet of the output device 3 14 is connected to the inlet of a tertiary centrifuge 15; a mother liquor output pipe 16 is provided at the outlet of the tertiary centrifuge 15.
[0017] like Figure 2 As shown, the stirring mechanism three 13 and the stirring mechanism two 8 are consistent with the structure of the stirring mechanism one 3. The specific structure of the stirring mechanism one 3 includes a stirring motor 31, a stirring shaft 32 and stirring blades 33; the stirring motor 31 is fixedly connected to the center of the top of the buffer tank 2; the stirring shaft 32 is movably connected to the center inside the buffer tank 2, the upper center of the stirring shaft 32 is fixedly connected to the lower output shaft of the stirring motor 31, and a plurality of stirring blades 33 are fixedly connected to the lower outside of the stirring shaft 32.
[0018] The stirring motor 31 is a servo motor or a variable frequency motor, so that the speed of the stirring motor 31 can be easily controlled by the existing technology.
[0019] like Figure 3 As shown, the output device three 14 and the output device two 9 are consistent with the structure of the output device one 4. The specific structure of the output device one 4 includes a fixed seat 41, an output motor 42, a driving gear 43, a driven gear 44, a spline shaft 45, a cylinder 46, a connecting hole block 47, a T-shaped head 48, an output connecting pipe 49, a conveying channel 410, a conveying screw rod 411 and a cover 412; the upper outer side of the fixed seat 41 is fixedly connected to the inside of the lower opening of the buffer tank 2, and the upper inner side of the fixed seat 41 is provided with a conveying channel 410, the lower right side of the fixed seat 41 is fixedly connected to the output motor 42, and the driving gear 43 is fixedly connected to the output shaft of the output motor 42, and the bottom center of the fixed seat 41 is fixedly connected to the gas Cylinder 46; the conveying screw rod 411 is movably connected inside the conveying channel 410, the top of the conveying screw rod 411 is fixedly connected with a cover 412, and the lower end of the conveying screw rod 411 is fixedly connected with a spline shaft 45; the driven gear 44 is movably connected inside the lower side of the fixing seat 41, the spline hole arranged in the center of the driven gear 44 is connected with the spline shaft 45, and the driven gear 44 is connected with the driving gear 43; the lower end of the spline shaft 45 is fixedly connected with a connecting hole block 47, and the lower side of the connecting hole block 47 is movably connected with a T-shaped head 48, and the lower end of the T-shaped head 48 is fixedly connected to the upper piston rod end of the cylinder 46; the lower right outlet of the conveying channel 410 is provided with an output connecting pipe 49.
[0020] Wherein, the output motor 42 is a servo motor or a variable frequency motor, so that the speed of the output motor 42 can be easily controlled by existing technology; the cooling tube 1 7 and the cooling tube 2 12 are both arranged in a spiral shape.
[0021] The use status of the utility model is as follows: the utility model has a reasonable and simple structure, low production cost and convenient installation. When in use, first add the citric acid solution into the liquid MVR evaporator 1 for concentration operation, where the concentration temperature of the MVR evaporator 1 is 75-95°C, the vacuum degree is -0.08 to -0.1Mpa, and the concentration of the concentrated liquid is 1.40-1.50g / mL, and then the concentrated liquid is transported to the buffer tank 2 for crystal growth, and the output temperature of the liquid after crystal growth is controlled at 60-65°C, and then after the crystal growth is completed, the liquid is transported to the primary centrifuge 5 through the output device 4 for centrifugal separation, and the temperature of the centrifugally separated liquid is not lower than 55°C, and then the separated mother liquor enters the cooling tank 6 for 10-30 hours of cooling and crystallization, and the output temperature of the liquid after crystal growth is controlled at 40-45°C, and then the crystallized liquid is transported to the secondary centrifuge 10 through the output device 29 for centrifugal separation, and the temperature of the centrifugally separated liquid is The temperature is not lower than 36.6°C, and then the separated mother liquor enters the cooling tank 2 11 for 10-30 hours of cooling and crystallization, and the temperature of the output of the feed liquid after crystallization is controlled below 10°C, and then the cooled and crystallized feed liquid is transported to the three-stage centrifuge 15 through the output device 3 14 for final centrifugal separation, and the mother liquor after separation is output through the mother liquor output pipe 16, here the stirring mechanism 1 3, the stirring mechanism 2 8 and the stirring mechanism 3 13 are turned on, and the stirring speed is controlled at 10-60 rpm, so as to improve the efficiency of crystallization, and also improve the production efficiency, and the output device 1 4, the output device 2 9 and the output device 3 14 are set, and the cover 412 can be moved up and opened by the extension of the cylinder 46, and then the conveying screw 411 is driven to rotate by the output motor 42, thereby improving the efficiency of the feed liquid output, and also avoiding the temperature drop caused by slow transportation, and can make full use of the heat in the mother liquor, thereby improving the production efficiency and reducing the production cost.
[0022] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" 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 should not be understood as a limitation on the present invention.
[0023] In the present utility model, unless otherwise clearly stipulated and limited, the terms "installation", "setting", "connection", "fixation", "screw-on" and the like should be understood in a broad sense. For example, it 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 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, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.
[0024] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which shall fall within the scope of the utility model to be protected. The scope of protection of the utility model shall be defined by the attached claims and their equivalents.
[0025] The control method of the present invention is to control by manually starting and closing the switch. The wiring diagram of the power element and the provision of power supply are common knowledge in the field, and the present invention is mainly used to protect mechanical devices, so the present invention will not explain the control method and wiring arrangement in detail.
Claims
1. A citric acid crystallization device, comprising an MVR evaporator (1), characterized in that: It also includes a buffer tank (2), a stirring mechanism (3), an output device (4), a first-stage centrifuge (5), a cooling tank (6), a cooling pipe (7), a stirring mechanism (8), an output device (9), a second-stage centrifuge (10), a cooling tank (11), a cooling pipe (12), a stirring mechanism (13), an output device (14), a third-stage centrifuge (15) and a mother liquor output pipe (16); The outlet of the MVR evaporator (1) is connected to the inlet of the buffer tank (2); The buffer tank (2) is provided with a stirring mechanism (3) inside, and an output device (4) is provided at the output port on the lower side of the stirring mechanism (3), and the output device (4) outlet is connected to the inlet of the first-stage centrifuge (5); The outlet of the first-stage centrifuge (5) is connected to the inlet of the cooling tank (6); A stirring mechanism 2 (8) is provided in the center of the cooling tank 1 (6), a cooling pipe 1 (7) is provided around the cooling tank 1 (6), an output device 2 (9) is provided at the outlet of the lower side of the cooling tank 1 (6), and the outlet of the output device 2 (9) is connected to the inlet of the secondary centrifuge (10); The outlet of the secondary centrifuge (10) is connected to the inlet of the second cooling tank (11); A stirring mechanism 3 (13) is provided in the center of the second cooling tank (11), a cooling pipe 2 (12) is provided around the second cooling tank (11), an output device 3 (14) is provided at the outlet of the lower side of the second cooling tank (11), and the outlet of the output device 3 (14) is connected to the inlet of the third-stage centrifuge (15); A mother liquid output pipe (16) is provided at the outlet of the three-stage centrifuge (15).
2. The citric acid crystallization device according to claim 1, characterized in that: The stirring mechanism three (13) and the stirring mechanism two (8) are consistent with the structure of the stirring mechanism one (3), and the specific structure of the stirring mechanism one (3) includes a stirring motor (31), a stirring shaft (32) and a stirring blade (33); The stirring motor (31) is fixedly connected to the center of the top of the buffer tank (2); The stirring shaft (32) is movably connected to the center of the buffer tank (2), the center of the upper side of the stirring shaft (32) is fixedly connected to the output shaft of the lower side of the stirring motor (31), and a plurality of stirring blades (33) are fixedly connected to the outer side of the lower side of the stirring shaft (32).
3. The citric acid crystallization device according to claim 2, characterized in that: The stirring motor (31) is a servo motor or a variable frequency motor.
4. The citric acid crystallization device according to claim 1, characterized in that: The output device three (14) and the output device two (9) are consistent with the structure of the output device one (4). The specific structure of the output device one (4) includes a fixed seat (41), an output motor (42), a driving gear (43), a driven gear (44), a spline shaft (45), a cylinder (46), a connecting hole block (47), a T-shaped head (48), an output connecting pipe (49), a conveying channel (410), a conveying screw rod (411) and a cover (412); The upper exterior of the fixing seat (41) is fixedly connected to the interior of the lower opening of the buffer tank (2); a conveying passage (410) is provided inside the upper interior of the fixing seat (41); an output motor (42) is fixedly connected to the lower right side of the fixing seat (41); a driving gear (43) is fixedly connected to the output shaft of the output motor (42); and a cylinder (46) is fixedly connected to the center of the bottom of the fixing seat (41); The conveying screw rod (411) is movably connected inside the conveying channel (410), a cover (412) is fixedly connected to the top of the conveying screw rod (411), and a spline shaft (45) is fixedly connected to the lower end of the conveying screw rod (411); The driven gear (44) is movably connected to the interior of the lower side of the fixing seat (41); a spline hole arranged in the center of the driven gear (44) is connected to a spline shaft (45); and the driven gear (44) is connected to the driving gear (43); The lower end of the spline shaft (45) is fixedly connected to a connecting hole block (47), and the lower side of the connecting hole block (47) is movably connected to a T-shaped head (48), and the lower end of the T-shaped head (48) is fixedly connected to the upper piston rod end of the cylinder (46); An output connecting pipe (49) is provided at the lower right outlet of the delivery channel (410).
5. The citric acid crystallization device according to claim 4, characterized in that: The output motor (42) is a servo motor or a variable frequency motor.
6. The citric acid crystallization device according to claim 1, characterized in that: The cooling tube 1 (7) and the cooling tube 2 (12) are both arranged in a spiral shape.