A production system for calcium propionate

Abstract

The present invention discloses a production system for calcium propionate, comprising a batching tank, a continuous flow microchannel reactor, a membrane filter, a fixed bed refining device, a spray dryer, and a controller. The batching tank is provided with a stirring assembly at the bottom thereof, the stirring assembly being electrically connected to the controller. The batching tank is provided with a water inlet pipe for conveying deionized water and a feed pipe for conveying calcium oxide powder or calcium hydroxide powder. A second delivery pump is provided on the connecting channel between the discharge port of the continuous flow microchannel reactor and the liquid inlet of the membrane filter. A third delivery pump is provided on the connecting channel between the liquid discharge port of the membrane filter and the liquid inlet of the fixed bed refining device. A fourth delivery pump is provided on the connecting channel between the liquid discharge port of the fixed bed refining device and the feed port of the spray dryer. The present invention provides a production system for calcium propionate, which can achieve continuous production of calcium propionate, reduce production costs of calcium propionate, and improve production efficiency.

Description

Technical Field

[0001] The present invention relates to the field of chemical reagents, and more particularly to a production system for calcium propionate. Background Art

[0002] Calcium propionate is a product developed in recent years by the World Health Organization (WHO) and the Food and Agriculture Organization of the United Nations (FAO).

[0003] Approved safe and reliable antifungal agent for food and feed.

[0004] Calcium propionate appears as white crystals or powder, odorless or with a slight propionic acid odor. It is hygroscopic and readily soluble in water. Its aqueous solution is weakly alkaline, slightly soluble in methanol and ethanol, and insoluble in benzene and acetone. It has a broad antimicrobial effect against mold, yeast, and bacteria, inhibiting microbial growth and preventing mold in feed. It can be used as a mildew inhibitor for food and feed, and as a preservative for bread and pastries. Calcium propionate is also a normal metabolic intermediate and can be absorbed by the body, providing essential calcium, a property unmatched by other preservatives.

[0005] The traditional production process of calcium propionate is to react propionic acid with a calcium source (mainly calcium hydroxide, calcium oxide or calcium carbonate) to obtain a calcium propionate solution, which is then filtered, evaporated, crystallized, and ground to obtain a calcium propionate powder product. The synthesis reaction is generally carried out in a batch reactor, and the subsequent separation process is generally carried out intermittently in batches, which cannot be produced continuously. The production capacity is limited, the process is backward, and it is easy to cause unstable product quality. In addition, impurities and pigments are inevitably present in the raw materials, and the resulting calcium propionate is slightly yellowish in color. Because impurities affect the purity, it is difficult for the final product to meet the national food-grade calcium propionate standards.

[0006] Therefore, it is necessary to develop a production system for continuous high-quality production of calcium propionate. Summary of the Invention

[0007] In view of this, the present invention provides a production system for calcium propionate, which can achieve continuous production of calcium propionate, reduce the production cost of calcium propionate, and improve production efficiency.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A production system for calcium propionate, comprising a batching tank, a continuous flow microchannel reactor, a membrane filter, a fixed bed refining device, a spray dryer and a controller, wherein a stirring assembly is provided at the bottom of the batching tank, the stirring assembly is electrically connected to the controller, the batching tank is provided with a water inlet pipe for conveying deionized water and a feed pipe for conveying calcium oxide powder or calcium hydroxide powder, a first delivery pump is provided on the connecting channel between the discharge port of the batching tank and the liquid inlet of the continuous flow microchannel reactor, and the continuous flow microchannel reactor is also provided with a feed port for adding propionic acid. A second delivery pump is provided on the connecting channel between the discharge port of the continuous flow microchannel reactor and the liquid inlet of the membrane filter, a third delivery pump is provided on the connecting channel between the discharge port of the membrane filter and the liquid inlet of the fixed bed refining device, and a fourth delivery pump is provided on the connecting channel between the discharge port of the fixed bed refining device and the feed port of the spray dryer. The continuous flow microchannel reactor, the fixed bed refining device, the spray dryer, the first delivery pump, the second delivery pump, the third delivery pump, and the fourth delivery pump are all electrically connected to the controller.

[0010] Preferably, a solenoid valve is provided on the water inlet pipe, and an induced draft fan is provided on the feed pipe, and both the solenoid valve and the induced draft fan are electrically connected to the controller.

[0011] Preferably, an online concentration meter is provided on the liquid discharge port of the batching tank, and the online concentration meter is electrically connected to the controller.

[0012] Preferably, the filter membrane on the membrane filter is arranged obliquely, and the membrane filter is provided with an opening for removing impurities at the bottom of the filter membrane.

[0013] Preferably, the pore size of the filter membrane is less than 1 micron, and the filter membrane is an organic membrane or an inorganic ceramic membrane.

[0014] Preferably, the stirring assembly includes a motor, a coupling and a spiral fan blade. The stirring mechanism is arranged at the bottom of the mixing tank, and the motor drives the spiral fan blade to rotate through the coupling.

[0015] Preferably, an activated carbon layer is provided inside the fixed bed refining device, the liquid inlet of the fixed bed refining device is provided at the lower part of the activated carbon layer, the liquid discharge port of the fixed bed refining device is provided at the upper part of the activated carbon layer, and the liquid inlet and liquid discharge port of the fixed bed refining device are staggered.

[0016] Preferably, the specific surface area of ​​the activated carbon in the activated carbon layer is ≥1000 m2 / g, and the iodine value is ≥950 mg / g.

[0017] Preferably, the spray dryer includes a nozzle, a drying box, a purge pipe, a heater, a blower, a fan and a cyclone collector. The discharge port of the fixed bed refining device is connected to the nozzle through the fourth delivery pump. The nozzle is arranged at the top of the drying box. A purge pipe is provided inside the drying box. The blower is connected to the drying box through a heater. A fan for controlling pressure balance is provided on the top of the drying box. The discharge port of the drying box is connected to the cyclone collector.

[0018] Preferably, the rear of the cyclone collector is connected to a sub-cyclone collector.

[0019] The beneficial effects of the present invention are that the system utilizes a microchannel continuous flow device to continuously feed and continuously carry out the synthesis reaction, membrane separation to continuously discharge insoluble matter, fixed-bed refining to continuously perform decolorization and impurity removal, and spray drying to continuously obtain a powdered product, thereby achieving continuous execution of the entire calcium propionate synthesis process. This simplifies the overall process, reduces the production cost of calcium propionate, and improves production efficiency. By utilizing equipment such as solenoid valves, induced draft fans, and online concentration meters, the production system can be fully automated without the need for human intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a flow chart of a production system for calcium propionate provided in an embodiment of the present invention.

[0022] 1. Batching tank; 11. Water inlet pipe; 12. Solenoid valve; 13. Induced draft fan; 14. Feed pipe; 15. Online concentration meter; 16. Stirring assembly; 2. Continuous flow microchannel reactor; 3. Membrane filter; 31. Filter membrane; 4. Fixed bed refining device; 41. Activated carbon layer; 5. Spray dryer; 51. Nozzle; 52. Drying oven; 53. Purge pipe; 54. Heater; 55. Blower; 56. Fan; 57. Cyclone collector; 6. First delivery pump; 7. Second delivery pump; 8. Third delivery pump; 9. Fourth delivery pump. DETAILED DESCRIPTION

[0023] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0024] It should be noted that all directional indications in this embodiment (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0026] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] In addition, the technical solutions of the various embodiments of the present invention may be combined with each other, but this must be based on the premise that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions is inconsistent or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention. It should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not intended to limit the present invention.

[0028] like Figure 1As shown, the embodiment of the present invention discloses a production system for calcium propionate, which includes a batching tank 1, a continuous flow microchannel reactor 2, a membrane filter 3, a fixed bed refining device 4, a spray dryer 5 and a controller. The bottom of the batching tank 1 is provided with a stirring assembly 16, and the stirring assembly 16 is electrically connected to the controller. The batching tank 1 is provided with a water inlet pipe 11 for conveying deionized water and a feed pipe 14 for conveying calcium oxide powder or calcium hydroxide powder. The connecting channel between the discharge port of the batching tank 1 and the liquid inlet of the continuous flow microchannel reactor 2 is provided with a first delivery pump 6. The continuous flow microchannel reactor 2 is also provided with a At the feed inlet for adding propionic acid, a second delivery pump 7 is provided on the connecting channel between the discharge port of the continuous flow microchannel reactor 2 and the liquid inlet of the membrane filter 3, a third delivery pump 8 is provided on the connecting channel between the discharge port of the membrane filter 3 and the liquid inlet of the fixed bed refining device 4, and a fourth delivery pump 9 is provided on the connecting channel between the discharge port of the fixed bed refining device 4 and the feed port of the spray dryer 5. The continuous flow microchannel reactor 2, the fixed bed refining device 4, the spray dryer 5, the first delivery pump 6, the second delivery pump 7, the third delivery pump 8, and the fourth delivery pump 9 are all electrically connected to the controller.

[0029] The water inlet pipe 11 is provided with a solenoid valve 12 , and the feed pipe 14 is provided with an induced draft fan 13 . The solenoid valve 12 and the induced draft fan 13 are both electrically connected to the controller, and the controller can perform intelligent dosing by controlling the solenoid valve 12 or the induced draft fan 13 .

[0030] An online concentration meter 15 is provided on the discharge port of the batching tank 1. The online concentration meter 15 is electrically connected to the controller. The online concentration meter 15 monitors the concentration of the lime milk in real time. When the standard is reached, the online concentration meter 15 feeds back the information to the controller, and the controller controls the first delivery pump 6 to start.

[0031] The filter membrane 31 on the membrane filter 3 is arranged at an angle. The membrane filter 3 is provided with an opening at the bottom of the filter membrane 31 for removing impurities. Insoluble matter can be removed through the filter membrane 31. The pore size of the filter membrane is less than 1 micron. The filter membrane 31 is selected from an organic membrane or an inorganic ceramic membrane.

[0032] The stirring assembly 16 includes a motor, a coupling and a spiral blade. The stirring mechanism is arranged at the bottom of the batching tank 1. The motor drives the spiral blade to rotate through the coupling. The stirring assembly 16 can fully mix the deionized water and calcium oxide powder or calcium hydroxide powder in the batching tank 1.

[0033] An activated carbon layer 41 is installed within the fixed-bed refining unit 4. The liquid inlet of the fixed-bed refining unit 4 is located below the activated carbon layer 41, and the liquid outlet of the fixed-bed refining unit 4 is located above the activated carbon layer 41. The liquid inlet and liquid outlet of the fixed-bed refining unit 4 are staggered. This configuration of the fixed-bed refining unit 4 allows for the efficient absorption of pigments and impurities in the filtered solution. The activated carbon in the activated carbon layer 41 has a specific surface area of ​​≥1000 m2 / g and an iodine value of ≥950 mg / g.

[0034] The spray dryer 5 includes a nozzle 51, a drying box 52, a purge pipe 53, a heater 54, a blower 55, a fan 56 and a cyclone collector 57. The discharge port of the fixed bed refining device 4 is connected to the nozzle 51 through the fourth delivery pump 9. The nozzle 51 is arranged at the top of the drying box 52. A purge pipe 53 is provided inside the drying box 52. The blower 55 is connected to the drying box 52 through the heater 54. A fan for controlling pressure balance is provided on the top of the drying box 52. The discharge port of the drying box 52 is connected to the cyclone collector 57.

[0035] The rear of the cyclone collector 57 is connected to a sub-cyclone collector, which can collect more refined calcium propionate powder.

[0036] Working principle:

[0037] When the system is in use, the controller controls the solenoid valve 12 and the induced draft fan 13 to open, controlling the automatic addition of feed and deionized water to the batching tank 1, and the stirring assembly 16 to fully stir the mixture to obtain a uniformly mixed lime milk. After the online concentration meter 15 monitors that the lime milk has reached the standard concentration, it feeds this information back to the controller, which controls the first delivery pump 6 to open, delivering the prepared lime milk to the continuous flow microchannel reactor 2. The controller controls the addition of propionic acid to the continuous flow microchannel reactor 2 to fully react with the lime milk to obtain a calcium propionate reaction liquid. The calcium propionate reaction liquid is delivered to the membrane filter 3 by the second delivery pump 7 for filtration and separation, obtaining a calcium propionate filtrate. Insoluble impurities are discharged along the slope of the filter membrane 31. The obtained calcium propionate filtrate is delivered to the bottom liquid inlet of the fixed bed refining device 4 by the third delivery pump 8. After passing through the activated carbon layer 41, the calcium propionate filtrate is discharged from the upper discharge port of the fixed bed refining device 4. The discharge liquid of the fixed bed refining device 4 is transported to the spray dryer 5 through the fourth delivery pump 9. The liquid entering the spray dryer 5 is sprayed out through the nozzle 51. The blower 55 adds hot air to the drying box 52 through the heater 54 to dry the liquid. A purge pipe 53 is provided inside the drying box 52 to prevent the calcium propionate powder from sticking to the inner wall of the drying box 52. A fan for controlling the pressure balance is provided on the top of the drying box 52. The discharge port of the drying box 52 is connected to the cyclone collector 57, and the calcium propionate powder is collected by the cyclone collector 57.

[0038] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A production system for calcium propionate, characterized in that, It includes a batching tank, a continuous flow microchannel reactor, a membrane filter, a fixed bed refining device, a spray dryer and a controller, wherein a stirring assembly is provided at the bottom of the batching tank, the stirring assembly is electrically connected to the controller, the batching tank is provided with a water inlet pipe for conveying deionized water and a feed pipe for conveying calcium oxide powder or calcium hydroxide powder, a first delivery pump is provided on the connecting channel between the discharge port of the batching tank and the liquid inlet of the continuous flow microchannel reactor, the continuous flow microchannel reactor is also provided with a feed inlet for adding propionic acid, a second delivery pump is provided on the connecting channel between the discharge port of the continuous flow microchannel reactor and the liquid inlet of the membrane filter, a third delivery pump is provided on the connecting channel between the discharge port of the membrane filter and the liquid inlet of the fixed bed refining device, a fourth delivery pump is provided on the connecting channel between the discharge port of the fixed bed refining device and the feed inlet of the spray dryer, and the continuous flow microchannel reactor, the fixed bed refining device, the spray dryer, the first delivery pump, the second delivery pump, the third delivery pump and the fourth delivery pump are all electrically connected to the controller; The filter membrane on the membrane filter is arranged obliquely, and the membrane filter is provided with an opening for removing impurities at the bottom of the filter membrane; An activated carbon layer is arranged inside the fixed bed refining device, the liquid inlet of the fixed bed refining device is arranged at the lower part of the activated carbon layer, the liquid discharge port of the fixed bed refining device is arranged at the upper part of the activated carbon layer, and the liquid inlet and liquid discharge port of the fixed bed refining device are arranged alternately.

2. A production system for calcium propionate according to claim 1, characterized in that, The water inlet pipe is provided with a solenoid valve, the feed pipe is provided with an induced draft fan, and both the solenoid valve and the induced draft fan are electrically connected to the controller.

3. A production system for calcium propionate according to claim 1, characterized in that, An online concentration meter is provided on the liquid discharge port of the batching tank, and the online concentration meter is electrically connected to the controller.

4. A production system for calcium propionate according to claim 1, characterized in that, The pore size of the filter membrane is less than 1 micron, and the filter membrane is selected from an organic membrane or an inorganic ceramic membrane.

5. A production system for calcium propionate according to claim 1, characterized in that, The stirring assembly includes a motor, a coupling and a spiral fan blade. The stirring assembly is arranged at the bottom of the mixing tank, and the motor drives the spiral fan blade to rotate through the coupling.

6. A production system for calcium propionate according to claim 1, characterized in that, The specific surface area of ​​the activated carbon in the activated carbon layer is ≥1000m 2 / g, iodine value ≥950mg / g.

7. A production system for calcium propionate according to claim 1, characterized in that, The spray dryer includes a nozzle, a drying box, a purge pipe, a heater, a blower, a fan and a cyclone collector. The discharge port of the fixed bed refining device is connected to the nozzle through the fourth delivery pump. The nozzle is arranged at the top of the drying box. A purge pipe is provided inside the drying box. The blower is connected to the drying box through a heater. A fan for controlling pressure balance is provided on the top of the drying box. The discharge port of the drying box is connected to the cyclone collector.

8. A production system for calcium propionate according to claim 7, characterized in that, The rear of the cyclone collector is connected to a sub-cyclone collector.

Images